Needle roller bearings and cages
3,031 dimension rows · 3,031 model records · FAG, INA, KOYO, NTN, SKF
Find · understand · compare
Needle roller bearings: types, dimensions & brand filters
Small-diameter rollers provide a compact radial section; some designs run directly on a prepared shaft.
On this page11 sections ⌄
Needle bearing size chart by construction
Search 3,031 source-labelled records. Start with the construction, then enter the dimensions you know. A diameter under rollers Fw is not the bore d of an inner ring; a cage outside Ew is not an outer-ring D.
Fw is the diameter under rollers; C is the drawn-cup width. Not a ring-bore d.
Filters update immediately. Designation search ignores separators, but the full recorded marking remains in each result. Changing construction clears dimensional filters because their meanings can change. Changing units converts valid entered dimensions, not the physical size. Inch display is converted and rounded to six decimals; the source-series filter is separate.
841 records match the selected structure and dimensions. Showing 1–24.
| Brand / designation | Inner datum | Outer datum | Axial / roller datum | Source series | Recorded closure |
|---|---|---|---|---|---|
| INAHK0205-TV | 2 mmFw | 4.6 mmD | 5 mmC | Not reported | Not reported |
| KOYOBK0306 | 3 mmFw | 6.5 mmD | 6 mmC | Metric series | Not reported |
| KOYOHK0306 | 3 mmFw | 6.5 mmD | 6 mmC | Metric series | Not reported |
| SKFBK 0306 TN | 3 mmFw | 6.5 mmD | 6 mmC | Not reported | Without |
| SKFHK 0306 TN | 3 mmFw | 6.5 mmD | 6 mmC | Not reported | Without |
| INASCE24-TV | 3.175 mmFw | 6.35 mmD | 6.35 mmC | Not reported | Not reported |
| KOYOJP-23-F | 3.175 mmFw | 6.35 mmD | 4.78 mmC | Inch series | Open |
| KOYOJP-24-F | 3.175 mmFw | 6.35 mmD | 6.35 mmC | Inch series | Open |
| INASCE2-1/2-4 | 3.969 mmFw | 7.145 mmD | 6.35 mmC | Not reported | Not reported |
| INASCE2-1/2-4-L091 | 3.969 mmFw | 7.145 mmD | 6.35 mmC | Not reported | Not reported |
| INASCE2-1/2-4-L271 | 3.969 mmFw | 7.145 mmD | 6.35 mmC | Not reported | Not reported |
| KOYOJP-2 1/2 3F | 3.97 mmFw | 7.142 mmD | 4.78 mmC | Inch series | Open |
| INABK0408 | 4 mmFw | 8 mmD | 8 mmC | Not reported | Not reported |
| INAHK0408 | 4 mmFw | 8 mmD | 8 mmC | Not reported | Not reported |
| INAHK0408-B-L271 | 4 mmFw | 8 mmD | 8 mmC | Not reported | Not reported |
| INAHK0408-B-L294 | 4 mmFw | 8 mmD | 8 mmC | Not reported | Not reported |
| INAHK0408-RR-B | 4 mmFw | 8 mmD | 8 mmC | Not reported | Not reported |
| KOYOBK0408 | 4 mmFw | 8 mmD | 8 mmC | Metric series | Not reported |
| KOYOHK0408 | 4 mmFw | 8 mmD | 8 mmC | Metric series | Not reported |
| SKFBK 0408 | 4 mmFw | 8 mmD | 8 mmC | Not reported | Without |
| SKFHK 0408 | 4 mmFw | 8 mmD | 8 mmC | Not reported | Without |
| INASCE36 | 4.762 mmFw | 8.731 mmD | 9.53 mmC | Not reported | Not reported |
| INASCE36-L527 | 4.762 mmFw | 8.731 mmD | 9.53 mmC | Not reported | Not reported |
| KOYOJ-36 | 4.763 mmFw | 8.733 mmD | 9.53 mmC | Inch series | Open |
No verified record matches these conditions in this snapshot. No nearby size is substituted. Check the marking, units and construction; absence here is not proof that a part does not exist.
Read the symbols before choosing a candidate
- Fw / d
- Fw describes the opening under the needles. d describes a ring bore. For a ringless design, the mating shaft is part of the rolling contact, not merely a mounting seat.
- D / Ew
- D describes the outside of a ring or drawn cup. Ew describes the needle complement in a radial cage assembly; check the mating housing raceway separately.
- B / C / Bc / U
- These width symbols are kept as reported. A ring width and a cage width are different checks even when their numbers happen to match.
- Dc1 / Dc / Dw on thrust cages
- The inner and outer cage datums and roller diameter do not specify the complete height with washers. Radial and thrust candidates are not interchangeable.
Turn the table into an identification checklist
- Record the full marking and whether rings or washers are separate. Search spaces and suffixes as recorded; a bare series is not a confirmed replacement.
- Choose the construction and measure the appropriate features. A free drawn cup can deform: nominal catalogue dimensions do not replace the specified installed-gauge check.
- Open a candidate to inspect its other dimensions, ratings, closure and source information. Confirm the applicable raceway finish, hardness, shaft/housing tolerances and lubrication.
- For thrust cages, identify both running surfaces and any washers. Do not calculate a complete stack height from roller diameter alone.
Scope: manufacturer-property snapshot 2026-10-03. This chart is not the entire manufacturer range, stock availability, a toleranced drawing or fitment approval. Separate rings, washers, clutches and combined/conical units are not included. Records without unambiguous source dimensions remain outside the table. Technical basis: NSK needle-bearing construction guidance, JTEKT needle-bearing classification tables and each retained product property.
What is this bearing type?
Needle roller bearings use long, small-diameter rollers to provide rolling contact in a compact section. Radial needle bearings and axial needle roller assemblies carry load in different directions and must not be treated as the same construction.
| Part or design | What it does | What to verify |
|---|---|---|
| Drawn cup | A thin formed outer ring provides the raceway. | Check the required housing support and fit. |
| Solid ring | A machined ring has its own mounting dimensions. | The same shaft diameter does not make it interchangeable with a drawn cup. |
| Cage assembly / no inner ring | Some designs run on a prepared shaft raceway. | The shaft surface becomes a bearing component, not just a mounting seat. |
On a small screen, scroll the table horizontally to read all three columns.
Variants that change the answer
Caged and full-complement versions have different speed and load characteristics. An inner ring, seals and axial-guidance components may be present or absent; preserve that distinction in the full designation.
What the family name cannot tell you
Removing the inner ring is not a general space-saving modification. Designs that run directly on a shaft need the specified raceway hardness, finish and geometry.
Identify the exact part before comparing
- Identify radial versus axial duty first.
- Record whether inner and outer raceways are supplied or formed by adjacent parts.
- Check the shaft/housing preparation and complete assembly before comparing catalogue dimensions.
Inspect real catalogue records below →Axial roller assemblies →Shaft and housing fits →Drawing lookup →
Technical reference basis: NSK: Needle Roller Bearings. Explanation and lookup workflow: BearingScope. Manufacturer-specific limits remain attached to the exact product record.
Needle bearing construction, measurement and shaft-raceway checks
A needle-bearing query may describe a complete radial bearing, a cage assembly, a thrust assembly or only loose rollers. Identify that scope before comparing dimensions or looking for an inner ring.
Drawn cup, solid ring, cage assembly and thrust type
| Construction | What is supplied | Key distinction |
|---|---|---|
| Drawn cup / shell type | Thin formed outer race with rollers | Housing support and the specified press fit are part of the installation. |
| Solid / machined ring | A thicker machined outer ring | Do not substitute a thin shell solely because the bore agrees. |
| Cage and needle assembly | Cage and rollers without conventional raceway rings | Adjacent shaft and housing surfaces may form the raceways. |
| Needle roller thrust assembly | Axial roller/cage assembly, with or without specified washers | An axial assembly is not a radial needle bearing. |
| Track roller / cam follower | A track-running outer ring and the specified mounting structure | Identify stud or yoke arrangement and track contact separately. |
| Drawn-cup roller clutch | A directional locking mechanism | Torque and overrun direction differ from ordinary radial-bearing duty. |
On a small screen, scroll the table horizontally.
Radial and axial refer to force relative to the shaft. A part being able to rotate in either direction does not establish axial load capacity.
With or without an inner ring?
A needle bearing without an inner ring can run directly on a suitably prepared shaft raceway. If that shaft cannot provide the required hardened, finished raceway, a compatible inner ring may be needed. IKO supplies separately identified rings for this purpose.
An ordinary shaft sleeve is not automatically a bearing raceway. Confirm the inner ring's outside raceway diameter, width, chamfers, lubrication features and match to the needle assembly. Its inside diameter describes the shaft seat, not the needle complement's inscribed-circle diameter.
- Identify whether the original design supplies an inner ring or uses the shaft directly.
- Keep the shaft-seat diameter separate from the roller-envelope dimension.
- Record the specified raceway hardness, surface finish and geometry from the exact catalogue or drawing.
- Do not add or remove an inner ring merely to make a dimension search return a result.
How to measure and search a needle bearing
First identify the component you are measuring. A bare roller's diameter and length do not identify a complete bearing. A bearing without an inner ring needs its drawing's roller-envelope dimension; a complete bearing with an inner ring also has a shaft-bore dimension.
| Item | Record | Avoid confusing it with |
|---|---|---|
| Complete radial bearing with inner ring | Bore, outside diameter, overall width and full marking | A separate inner-ring part number. |
| Radial bearing without inner ring | Inscribed-circle / shaft-raceway dimension, outer dimension and width | The outside diameter of a fitted sleeve. |
| Drawn cup | Catalogue nominal dimensions and cup construction | A squeezed or distorted loose-shell reading as a certified fit tolerance. |
| Axial assembly | Inside diameter, outside diameter and axial height; washer scope | Radial-bearing width or the height without required washers. |
| Loose needles | Roller diameter, length and end/profile specification | A complete bearing's d×D×B. |
On a small screen, scroll the table horizontally.
Keep metric and inch series explicit. Convert units using 1 in = 25.4 mm, but do not round an imperial measurement to the nearest metric model and declare it equivalent. Nominal size is not manufacturing tolerance.
Caged, full-complement, open-end and closed-end shells
A cage spaces and guides the rollers. A full-complement construction packs more rollers into the available space, changing the load/speed trade-off. The correct choice depends on the documented duty, not on which design visibly contains more metal.
Open-end and closed-end shell variants are separate constructions; closed-end does not mean a universal two-sided contact seal. IKO lists both metric and inch shell families. Preserve the entire series and closure description rather than translating every closed form into '2RS'.
Sealed, stainless, plastic-cage and split-cage requests require their own material and design records. This guide does not assign those features to every needle bearing.
Applications, advantages and limitations
Needle rollers are useful where radial space is restricted. Manufacturer examples include gears, speed reducers and selected machine-tool arrangements; thrust needle assemblies also appear in compact axial supports. A compact section does not remove the need for suitable raceways and lubrication.
| Need | Useful starting point | Do not assume |
|---|---|---|
| Compact radial support | Drawn cup, solid needle bearing or cage assembly | That all three use the same shaft or housing preparation. |
| Compact axial support | Needle thrust assembly and required race washers | That a radial needle bearing carries the same axial duty. |
| External cam or track contact | Cam follower or roller follower | That an ordinary radial outer ring is a suitable track roller. |
| One-way drive or backstop | A documented roller clutch | That any needle bearing provides directional locking. |
On a small screen, scroll the table horizontally.
Against a ball bearing, compare the available radial section, raceway scope and required load directions. Against another roller design, compare actual ratings and installation space; the word 'needle' is not a performance grade. Vehicle, chainsaw, bicycle and transmission fitment still requires the specific equipment and part record.
Needle versus ball bearing versus plain bushing
Choose by the contact system and support requirements, not by the shared outside dimensions. Needle bearings offer a compact radial section; a plain bushing uses sliding contact instead of rolling elements.
| Decision | Needle roller bearing | Ball bearing / plain bushing |
|---|---|---|
| Contact | Slender rollers run on defined raceways. | Balls roll on raceways; a bushing has a sliding interface. |
| Radial space | A low-section option where a suitable shaft raceway or inner ring is available. | Compare the complete ball-bearing envelope; for a bushing include its wall and running clearance. |
| Axial support | A radial needle design is not a thrust assembly. | Ball-bearing axial capacity depends on family; a plain bush needs its specified flange or thrust surface for axial duty. |
| Lubrication decision | Use the lubricant and delivery method for the roller/raceway duty. | Ball bearings also need their specified lubrication; bushings differ by material and may use supplied lubrication or an external film. |
| Replacement check | Preserve raceway finish, hardness, fit, clearance and the verified load/speed limits. | Changing from rolling to sliding contact is a redesign, not an automatic cross-reference. |
On a small screen, scroll the table horizontally.
For a general cylindrical-roller alternative, compare rib arrangement and complete radial envelope. Neither 'roller' nor 'needle' guarantees a higher permitted speed or a drop-in replacement.
Before installing or removing a needle bearing
This checklist helps identify missing assembly information. Exact press tools, fits and extraction methods differ between a thin shell, machined ring, loose needle set and thrust assembly.
- Isolate the machine and record the complete marking, orientation, supplied rings and washers.
- Check the shaft/housing drawing and whether the shaft itself is a raceway.
- Inspect surfaces for damage and confirm the required fit and finish before installing a new bearing.
- Use the specified support and fitting tool for the actual bearing construction; do not press through the rolling elements or deform a thin shell.
- Retain the correct roller set and cage. Do not combine random loose needles because their approximate diameter looks right.
- For removal, establish access, retention and which component will be discarded before choosing a puller. Stop if the method would damage the reusable raceway.
- Use the documented lubricant and inspect freedom of movement and the completed assembly according to the machine instructions.
A generic size chart cannot supply a Toyota differential extraction procedure, chainsaw grease specification or bicycle shock-kit compatibility. Those remain equipment-specific requests.
Questions to settle before selecting a model
Are needle bearings the same as roller bearings?
Needle bearings belong to the roller-bearing group and use slender rollers. The family still includes different radial and axial constructions, not one interchangeable part.
Are loose needle pins a complete bearing?
No. Roller dimensions, grade, end profile, quantity, cage and raceway design all matter. A bag of similarly sized rollers does not verify an assembled bearing.
Do needle bearings need grease?
They need the lubrication specified for the design and duty; some arrangements use oil rather than grease. Assembly grease used to retain loose rollers is not automatically the required service lubricant.
Can I replace a needle bearing with a bushing?
That changes rolling contact to sliding contact and can alter clearance, lubrication, friction and load capacity. Matching dimensions alone does not approve the redesign.
Reviewed 2026-10-01. Technical basis: NSK Needle Roller Bearings; IKO Shell Type Needle Roller Bearings; IKO Inner Rings; NSK Bearing ABCs: Roller Bearings and Bearing Basics; SKF Needle Roller Bearings catalogue overview; NSK Bearing Maintenance: Mounting. Original BearingScope explanation and checklists. General guidance is not a model-specific installation instruction or replacement approval.
Needle bearing dimension tables: verified SKF HK and IKO inch-series examples
Use these manufacturer-scoped examples alongside the construction and mounting explanations above. Keep the complete designation, brand and drawing symbols: nominal dimensions identify a candidate, not an approved replacement.
SKF HK needle bearing dimension examples
Nominal Fw×D×C in mm: roller-set bore × cup outside diameter × cup width. C here denotes width, not the dynamic load rating. These are selected SKF catalogue records, not a complete catalogue or cross-brand interchange table.
| SKF designation | Fw×D×C (mm) | SKF designation | Fw×D×C (mm) |
|---|---|---|---|
| HK 0306 TN | 3×6.5×6 | HK 0608 | 6×10×8 |
| HK 0609 | 6×10×9 | HK 0810 | 8×12×10 |
| HK 0910 | 9×13×10 | HK 1010 | 10×14×10 |
| HK 1012 | 10×14×12 | HK 1015 | 10×14×15 |
| HK 1210 | 12×16×10 | HK 1212 | 12×18×12 |
| HK 1312 | 13×19×12 | HK 1412 | 14×20×12 |
| HK 1512 | 15×21×12 | HK 1612 | 16×22×12 |
| HK 1616 | 16×22×16 | HK 2012 | 20×26×12 |
| HK 2016 | 20×26×16 | HK 2020 | 20×26×20 |
| HK 2020.2RS | 20×26×20 | HK 2216 | 22×28×16 |
| HK 2220 | 22×28×20 | HK 3016 | 30×37×16 |
On a small screen, scroll the table horizontally.
Basis: SKF Needle Roller Bearings, printed pages 82–90. HK 1210 and HK 1212 do not share an outside diameter. HK 2020 and HK 2020.2RS share an envelope, not all ratings. Confirm the current full drawing before replacement.
Inch-series examples: keep the series prefix
An inch-series name is not a rounded metric size. The following IKO catalogue examples show why a shared numerical portion is insufficient identification.
| IKO model | Fw×D×C (mm) | Nominal inch envelope |
|---|---|---|
| BA 1616 Z | 25.400×31.750×25.40 | 1×1¼×1 |
| BHA 1616 Z | 25.400×33.338×25.40 | 1×1⁵⁄₁₆×1 |
On a small screen, scroll the table horizontally.
Basis: IKO Shell Type Needle Roller Bearings, printed pages B37–B38. BHA is the heavier series here. Neither row establishes an interchange with another maker's B1616, BH1616 or SCE designation.
How to measure a thin cup without inventing its tolerance
A loose thin cup is not a reliable basis for judging the final running bore. IKO specifies a gauge-ring and plug/taper-gauge method for its shell bearings because the cup can deform. Its measurement method must not be replaced with a loose caliper reading and a guessed clearance.
- Use the marking and nominal chart to identify candidates; record measurement uncertainty and wear.
- Obtain the exact bearing's housing, shaft and gauging instructions.
- Separate nominal dimensions from manufacturing tolerances and installed clearance.
- Check the installed assembly using the specified method. Housing material and support are part of the fit decision.
The chart above is not a universal housing tolerance, shaft tolerance or press-fit recommendation.
Turn a size match into a useful comparison record
Leave unknown fields visibly unknown. For example, a B1616 query must not silently become an IKO BA 1616 Z record; the similar number is a lead for research, not a verified relationship. Likewise, a matching HK envelope does not settle a vehicle or machine fitment.
| Field | Record for every candidate |
|---|---|
| Identity | Manufacturer, complete designation and catalogue/drawing revision. |
| Dimension scope | Roller-set bore or inner-ring bore; cup OD and width; unit. |
| Construction | Ring scope, cage, open/closed end, seals and lubrication features. |
| Performance evidence | Exact load/speed ratings with their definitions and conditions. |
| Application evidence | Shaft/raceway, housing, retention, lubricant and required operating duty. |
On a small screen, scroll the table horizontally.
Questions to settle before selecting a model
Do HK 1210 and HK 1212 share the same outside diameter?
Not in the SKF catalogue rows shown here: the listed outside diameters are 16 mm and 18 mm. Do not infer an envelope from the shared 12 alone.
Does the equal HK 2020 and HK 2020.2RS envelope prove interchangeability?
No. The selected SKF rows share nominal dimensions, but construction, ratings and the actual application still require checking.
Is BA 1616 Z the same size as BHA 1616 Z?
The IKO examples have equal roller-set bore and width but different outside diameters: 31.750 mm and 33.338 mm.
Can a loose-cup measurement prove the installed clearance?
No. Thin-cup deformation and the housing fit affect the installed condition. Use the specified gauging and mounting procedure.
Reviewed 2026-10-02. Technical basis: NSK Needle Roller Bearings: construction and load-direction overview; SKF Needle Roller Bearings: selected dimension tables, printed pages 82–90; IKO Shell Type Needle Roller Bearings: gauging and inch-series tables, B3–B4 and B37–B38. Original BearingScope explanation and checklists. General guidance is not a model-specific installation instruction or replacement approval.
Application starting points
Where this family is used
Compact transmissions and oscillating mechanisms.
Read equipment selection guides →Do not skip
Selection and interchange checks
Specify with or without an inner ring, shaft hardness and finish, cage, seals and axial location.
Full verification checklist →Database-backed results
5,438 recordsNeedle roller bearings — actual products
First 12 records. Open all results to filter brands and technical attributes. These are search candidates, not approved replacements.
| Brand / complete designation | Type | d×D×B (mm) | Closure | Original precision | Clearance |
|---|---|---|---|---|---|
| KOYOAXK0619TN | Needle roller bearing | —×—×— | Not reported | Not reported | Not reported |
| KOYOAXK0821TN | Needle roller bearing | —×—×— | Not reported | Not reported | Not reported |
| KOYOAXK100135 | Needle roller bearing | —×—×— | Not reported | Not reported | Not reported |
| KOYOAXK1024 | Needle roller bearing | —×—×— | Not reported | Not reported | Not reported |
| KOYOAXK110145 | Needle roller bearing | —×—×— | Not reported | Not reported | Not reported |
| KOYOAXK120155 | Needle roller bearing | —×—×— | Not reported | Not reported | Not reported |
| KOYOAXK1226 | Needle roller bearing | —×—×— | Not reported | Not reported | Not reported |
| KOYOAXK130170 | Needle roller bearing | —×—×— | Not reported | Not reported | Not reported |
| KOYOAXK140180 | Needle roller bearing | —×—×— | Not reported | Not reported | Not reported |
| KOYOAXK150190 | Needle roller bearing | —×—×— | Not reported | Not reported | Not reported |
| KOYOAXK1528 | Needle roller bearing | —×—×— | Not reported | Not reported | Not reported |
| KOYOAXK160200 | Needle roller bearing | —×—×— | Not reported | Not reported | Not reported |
— = not recorded. Width conventions differ for tapered assemblies, thrust bearings and mounted units. Always inspect the dimensional drawing.
Filter all 5,438 records →All recorded subtypes in this family
Original catalogue descriptions are preserved in the records. Identical display names, including singular/plural variants, share one combined entry. Selecting a subtype opens its brand and technical filters.
Alignment needle roller bearing, with an inner ring9Alignment needle roller bearings, without an inner ring8Combined needle roller bearings118Double row needle roller bearing2Double row needle roller bearing with machined rings, with flanges and an inner ring14Double row needle roller bearing with machined rings, with flanges, without an inner ring13Double row needle roller bearing with machined rings, without flanges, without an inner ring4Drawn cup needle roller bearing closed end68Drawn cup needle roller bearing open end415Drawn cup needle roller bearing with a closed end35Drawn cup needle roller bearing with a closed end and integral sealing5Drawn cup needle roller bearing with open ends65Drawn cup needle roller bearing with open ends and integral sealing45Drawn cup needle roller bearing with open ends and relubrication feature1Inner ring for needle roller bearings, ir series180Inner ring for needle roller bearings, ir series, with lubrication feature11Inner ring for needle roller bearings, lr series21Needle roller bearings3,483Needle roller cage assembly347Needle roller/angular contact ball bearing30Single row needle roller and cage assembly204Single row needle roller bearing with machined rings, with flanges131Single row needle roller bearing with machined rings, with flanges and integral sealing20Single row needle roller bearing with machined rings, with flanges and integral sealing, without inner ring18Single row needle roller bearing with machined rings, with flanges, without inner ring163Single row needle roller bearing with machined rings, without flanges13Single row needle roller bearing with machined rings, without flanges and inner ring15
No subtype matches this text.
Look up real bearing dimensions
Choose a bearing structure, then enter the dimensions you know. You can leave unknown dimensions blank. The chart contains 29,253 catalogue records whose bore, outside diameter and width or height symbols have been checked against retained manufacturer properties. It is not a complete ISO standard or an interchange list.
Changing units converts entered values; it does not reinterpret 12.7 mm as 12.7 inches. Inch fractions such as 1/2 are accepted. A blank field means unknown, not zero.
Showing the first 24 of 162 Needle roller bearings records. Filters apply immediately.
| Brand / complete designation | Original construction | Bore d | Outside D | Width / height | Recorded closure |
|---|---|---|---|---|---|
| SKFNKI 5/12 TN | Single row needle roller bearing with machined rings, with flanges | 5 mm | 15 mm | 12 mm (B) | Without |
| SKFNKI 5/16 TN | Single row needle roller bearing with machined rings, with flanges | 5 mm | 15 mm | 16 mm (B) | Without |
| SKFNKI 6/12 TN | Single row needle roller bearing with machined rings, with flanges | 6 mm | 16 mm | 12 mm (B) | Without |
| SKFNKI 6/16 TN | Single row needle roller bearing with machined rings, with flanges | 6 mm | 16 mm | 16 mm (B) | Without |
| SKFNAO 6X17X10 TN | Single row needle roller bearing with machined rings, without flanges | 6 mm | 17 mm | 10 mm (B) | Without |
| SKFNKI 7/12 TN | Single row needle roller bearing with machined rings, with flanges | 7 mm | 17 mm | 12 mm (B) | Without |
| SKFNKI 7/16 TN | Single row needle roller bearing with machined rings, with flanges | 7 mm | 17 mm | 16 mm (B) | Without |
| SKFNKI 9/12 | Single row needle roller bearing with machined rings, with flanges | 9 mm | 19 mm | 12 mm (B) | Without |
| SKFNKI 9/16 | Single row needle roller bearing with machined rings, with flanges | 9 mm | 19 mm | 16 mm (B) | Without |
| SKFNA 4900 | Single row needle roller bearing with machined rings, with flanges | 10 mm | 22 mm | 13 mm (B) | Without |
| SKFNA 4900 RS | Single row needle roller bearing with machined rings, with flanges and integral sealing | 10 mm | 22 mm | 14 mm (B) | Seal on one side |
| SKFNA 4900.2RS | Single row needle roller bearing with machined rings, with flanges and integral sealing | 10 mm | 22 mm | 14 mm (B) | Seal on both sides |
| SKFNKI 10/16 | Single row needle roller bearing with machined rings, with flanges | 10 mm | 22 mm | 16 mm (B) | Without |
| SKFNKI 10/20 | Single row needle roller bearing with machined rings, with flanges | 10 mm | 22 mm | 20 mm (B) | Without |
| SKFNA 4901 | Single row needle roller bearing with machined rings, with flanges | 12 mm | 24 mm | 13 mm (B) | Without |
| SKFNAO 12X24X13 | Single row needle roller bearing with machined rings, without flanges | 12 mm | 24 mm | 13 mm (B) | Without |
| SKFNA 4901 RS | Single row needle roller bearing with machined rings, with flanges and integral sealing | 12 mm | 24 mm | 14 mm (B) | Seal on one side |
| SKFNA 4901.2RS | Single row needle roller bearing with machined rings, with flanges and integral sealing | 12 mm | 24 mm | 14 mm (B) | Seal on both sides |
| SKFNKI 12/16 | Single row needle roller bearing with machined rings, with flanges | 12 mm | 24 mm | 16 mm (B) | Without |
| SKFNKI 12/20 | Single row needle roller bearing with machined rings, with flanges | 12 mm | 24 mm | 20 mm (B) | Without |
| SKFNA 6901 | Single row needle roller bearing with machined rings, with flanges | 12 mm | 24 mm | 22 mm (B) | Without |
| SKFNAO 12X28X12 | Single row needle roller bearing with machined rings, without flanges | 12 mm | 28 mm | 12 mm (B) | Without |
| SKFNKI 15/16 | Single row needle roller bearing with machined rings, with flanges | 15 mm | 27 mm | 16 mm (B) | Without |
| SKFNKI 15/20 | Single row needle roller bearing with machined rings, with flanges | 15 mm | 27 mm | 20 mm (B) | Without |
Page 1
Read the width symbol: B, T and H are not interchangeable labels. For a tapered pair use assembly T, not the cone width. Needle designs without an inner ring may use roller-set bore Fw instead of d and are outside this d/D chart. Matched sets, housings and loose cups/cones are also excluded. Open the full product to check drawings, ratings, seals, clearance and precision.
Snapshot 2026-10-02. Every row keeps its actual product link and source-reported units; missing or ambiguous geometry is withheld. Equal nominal size alone does not approve replacement. Inch display is a conversion, rounded to six decimals, not an inch-series classification.
Bearing size charts: PDF downloads
Download searchable English tables with the brand, complete designation, source-labelled dimensions in millimetres and links to the matching model records. Choose a family or a series; the charts preserve construction differences instead of treating every size as interchangeable.
Scope: original BearingScope reference tables from our verified catalogue snapshots. These are not manufacturer manuals, CAD, full technical datasheets or a complete list of all bearing sizes. Equal dimensions do not establish interchangeability. No load ratings, tolerances or vehicle fitment are inferred.
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Reference basis & data limits
Manufacturer terminology is retained in the product records. Technical reference basis: JTEKT Basic Bearing Knowledge (boundary dimensions, tolerance classes and lubrication); NSK Bearing ABCs (lubrication, designations and clearance); NTN technical FAQs (closure codes and component interchange); SKF rolling-bearing selection and maintenance references.
Selection workflows and catalogue grouping are BearingScope editorial aids. Verify the current drawing and application requirements before using a candidate. Missing database information is not converted into an assumed match.