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Stainless & corrosion-resistant bearing selection

A stainless label does not establish compatibility with every chemical, washdown or marine exposure.

On this page5 sections
Materials, size classes & real model records

Stainless bearing materials and corrosion-resistant assemblies

Specify the bearing's structure and each material separately. Stainless, sealed and corrosion-resistant do not mean waterproof, suitable for every chemical, or interchangeable with the same-size steel bearing.

440C, 304 and 316: identify the component first

Material or labelWhere it may appearWhat must not be assumed
440C / equivalent martensitic stainlessHardened bearing raceways and balls in documented NSK unitsNot immunity to chloride attack or all cleaning chemicals
304 / austenitic stainlessFor example, flingers in NSK's documented stainless unitsA 304 flinger does not establish 304 raceways
316 / austenitic stainlessFor example, housings in NSK's corrosion-resistant mounted rangeA 316 housing does not make its insert a 316 bearing
316 bearing rings and ballsDedicated product designs with their own ratingsDo not copy the load and speed ratings of a 440C design
Stainless steel, grade not reportedAn incomplete material descriptionDo not infer 440C, 304 or 316 from appearance or a generic prefix

On a small screen, scroll the table horizontally.

NSK's mounted products illustrate mixed component specifications: a corrosion-resistant assembly can legitimately contain different stainless grades. This is why BearingScope keeps the original description instead of assigning a single alloy to every part.

Stainless model records →Loose stainless balls →

Deep-groove, thrust, rod-end and mounted-unit searches

Requested productDimensions and construction to capture
Deep-groove / sealed ball bearingd×D×B, seal or shield, clearance and exact material
Angular-contact / thrust bearingContact arrangement or axial washers, orientation and assembly height
Needle / tapered / spherical rollerRoller structure, ring scope and full assembly designation
Rod end / spherical plainThread, handedness, articulation and sliding pair
Pillow block / two-bolt / four-bolt flange unitInsert, housing alloy, mounting pattern, shaft locking and seals
Linear bearing / sleeveShaft or guide interface, raceway or sliding material and stroke
Hinge, swivel, drawer slide or lazy SusanHardware assembly identity; not an ordinary radial-bearing replacement

On a small screen, scroll the table horizontally.

The searchable records below are the stainless products presently loaded with complete boundary dimensions. Absence of a requested structure is an evidence gap, not a claim that such products do not exist.

Browse by structural family →Mounted-unit reference →

Wet, saltwater and chemical service

ExposureRecordCheck before accepting a material
Condensation / occasional splashWet time, drainage and temperature cyclesCorrosion protection and lubricant retention
Saltwater / marineSalinity, temperature, immersion duration and stagnant zonesPitting/crevice-corrosion risk; no blanket marine approval
Washdown / food equipmentCleaning chemical, concentration, pressure and rinse methodSeal arrangement, housing drainage and lubricant requirements
Acid / alkali / process fluidExact chemical, concentration, temperature and exposure timeAll wetted components, not just rings
Vacuum / clean processPressure, temperature, lubricant and cleanliness specificationA special corrosion-resistant range may be needed

On a small screen, scroll the table horizontally.

SMB distinguishes 316's corrosion behaviour from its limited mechanical rating and warns about stagnant seawater. NSK offers several corrosion-resistant constructions for different environments; its guidance also states that integral seals cannot completely prevent water entry. Select a documented system, not the broadest material label.

Why can a stainless bearing corrode?

Start by identifying the actual corrosion location and material. A stainless housing can surround a different insert, and an apparently rust-resistant ring can still face an unsuitable chemical exposure. Record fluid, concentration, temperature and time rather than concluding that all stainless bearings are defective.

Inspect water entry, damaged seals, blocked drainage, stagnant pockets and lubricant condition. Photograph the location before cleaning. Corrosion damage, fretting and electrical damage are not interchangeable diagnoses; visible damage needs investigation before reuse.

Troubleshooting reference →Maintenance and inspection →

Stainless steel vs ceramic bearings

QuestionStainless bearingHybrid or full ceramic
What is metallic?Identify every component and actual alloyHybrid rings remain metallic; full-ceramic rings differ
Corrosion selectionUse chemical and mechanical suitability togetherCheck cage, seals and exact ceramic composition as well
Load, speed and shockUse ratings for the exact stainless productDo not inherit those ratings from a same-size steel model
Lubrication and fitFollow the specified lubricant and fitsDo not infer dry running or identical thermal fits
Evidence for replacementOriginal drawing and complete designationSame verification, plus material-change consequences

On a small screen, scroll the table horizontally.

Full ceramic and hybrid comparison →Replacement checklist →

Use full stainless designations, not just the base number

SKF W 608 and W 608-2Z are both recorded at 8×22×7 mm, but the first is open and the second is shielded on both sides. W 6204-2Z is recorded at 20×47×14 mm. These examples identify actual loaded products; they do not establish that an unqualified 608 or 6204 is stainless.

Select a model below to inspect all retained technical fields. The description can confirm a stainless family while leaving the exact alloy or precision class unreported. Do not fill those gaps by decoding an unfamiliar S or W prefix across brands.

Brand designation decoder →Find by dimensions →
Material-specific dimension reference

316 stainless-steel bearing sizes

130 source-listed references from SMB Bearings, checked 2026-10-03. This supplementary table is separate from the loaded manufacturer product records below. Dimensions are d×D×B in mm; these are complete radial ball bearings, not loose balls.

The S316 prefix identifies this source's 316 stainless range. Do not carry over the load, speed, precision or corrosion limits of a 440C, KS440 or generic S-prefixed bearing. Sealed references retain their complete 2PES suffix.

All 130 source-listed references are readable below. Enable JavaScript for immediate filtering and pagination.

SMB referenceRings / ballsClosured (mm)D (mm)B (mm)
S316-623316 stainless steelOpen3104
S316-623-2PES316 stainless steelSealed3104
S316-624316 stainless steelOpen4135
S316-624-2PES316 stainless steelSealed4135
S316-625316 stainless steelOpen5165
S316-625-2PES316 stainless steelSealed5165
S316-606316 stainless steelOpen6176
S316-606-2PES316 stainless steelSealed6176
S316-626316 stainless steelOpen6196
S316-607316 stainless steelOpen7196
S316-607-2PES316 stainless steelSealed7196
S316-627316 stainless steelOpen7227
S316-627-2PES316 stainless steelSealed7227
S316-608316 stainless steelOpen8227
S316-608-2PES316 stainless steelSealed8227
S316-628316 stainless steelOpen8248
S316-628-2PES316 stainless steelSealed8248
S316-609316 stainless steelOpen9247
S316-609-2PES316 stainless steelSealed9247
S316-629316 stainless steelOpen9268
S316-629-2PES316 stainless steelSealed9268
S316-6800316 stainless steelOpen10195
S316-6800-2PES316 stainless steelSealed10195
S316-6900316 stainless steelOpen10226
S316-6900-2PES316 stainless steelSealed10226
S316-6000316 stainless steelOpen10268
S316-6000-2PES316 stainless steelSealed10268
S316-6200316 stainless steelOpen10309
S316-6200-2PES316 stainless steelSealed10309
S316-6300316 stainless steelOpen103511
S316-6300-2PES316 stainless steelSealed103511
S316-6801316 stainless steelOpen12215
S316-6801-2PES316 stainless steelSealed12215
S316-6901316 stainless steelOpen12246
S316-6901-2PES316 stainless steelSealed12246
S316-6001316 stainless steelOpen12288
S316-6001-2PES316 stainless steelSealed12288
S316-6201316 stainless steelOpen123210
S316-6201-2PES316 stainless steelSealed123210
S316-6301316 stainless steelOpen123712
S316-6301-2PES316 stainless steelSealed123712
S316-6802316 stainless steelOpen15245
S316-6802-2PES316 stainless steelSealed15245
S316-6902316 stainless steelOpen15287
S316-6902-2PES316 stainless steelSealed15287
S316-6002316 stainless steelOpen15329
S316-6002-2PES316 stainless steelSealed15329
S316-6202316 stainless steelOpen153511
S316-6202-2PES316 stainless steelSealed153511
S316-6302316 stainless steelOpen154213
S316-6302-2PES316 stainless steelSealed154213
S316-6803316 stainless steelOpen17265
S316-6803-2PES316 stainless steelSealed17265
S316-6903316 stainless steelOpen17307
S316-6903-2PES316 stainless steelSealed17307
S316-6003316 stainless steelOpen173510
S316-6003-2PES316 stainless steelSealed173510
S316-6203316 stainless steelOpen174012
S316-6203-2PES316 stainless steelSealed174012
S316-6303316 stainless steelOpen174714
S316-6303-2PES316 stainless steelSealed174714
S316-6804316 stainless steelOpen20327
S316-6804-2PES316 stainless steelSealed20327
S316-6904316 stainless steelOpen20379
S316-6904-2PES316 stainless steelSealed20379
S316-6004316 stainless steelOpen204212
S316-6004-2PES316 stainless steelSealed204212
S316-6204316 stainless steelOpen204714
S316-6204-2PES316 stainless steelSealed204714
S316-6304316 stainless steelOpen205215
S316-6304-2PES316 stainless steelSealed205215
S316-6805316 stainless steelOpen25377
S316-6805-2PES316 stainless steelSealed25377
S316-6905316 stainless steelOpen25429
S316-6905-2PES316 stainless steelSealed25429
S316-6005316 stainless steelOpen254712
S316-6005-2PES316 stainless steelSealed254712
S316-6205316 stainless steelOpen255215
S316-6205-2PES316 stainless steelSealed255215
S316-6305316 stainless steelOpen256217
S316-6305-2PES316 stainless steelSealed256217
S316-6806316 stainless steelOpen30427
S316-6806-2PES316 stainless steelSealed30427
S316-6906316 stainless steelOpen30479
S316-6906-2PES316 stainless steelSealed30479
S316-6006-2PES316 stainless steelSealed305513
S316-6206316 stainless steelOpen306216
S316-6206-2PES316 stainless steelSealed306216
S316-6306316 stainless steelOpen307219
S316-6306-2PES316 stainless steelSealed307219
S316-6807316 stainless steelOpen35477
S316-6807-2PES316 stainless steelSealed35477
S316-6907316 stainless steelOpen355510
S316-6907-2PES316 stainless steelSealed355510
S316-6007316 stainless steelOpen356214
S316-6007-2PES316 stainless steelSealed356214
S316-6207316 stainless steelOpen357217
S316-6207-2PES316 stainless steelSealed357217
S316-6307316 stainless steelOpen358021
S316-6307-2PES316 stainless steelSealed358021
S316-6808316 stainless steelOpen40527
S316-6808-2PES316 stainless steelSealed40527
S316-6908316 stainless steelOpen406212
S316-6908-2PES316 stainless steelSealed406212
S316-6008316 stainless steelOpen406815
S316-6008-2PES316 stainless steelSealed406815
S316-6208316 stainless steelOpen408018
S316-6208-2PES316 stainless steelSealed408018
S316-6308316 stainless steelOpen409023
S316-6308-2PES316 stainless steelSealed409023
S316-6809316 stainless steelOpen45587
S316-6809-2PES316 stainless steelSealed45587
S316-6909316 stainless steelOpen456812
S316-6909-2PES316 stainless steelSealed456812
S316-6009316 stainless steelOpen457516
S316-6009-2PES316 stainless steelSealed457516
S316-6209316 stainless steelOpen458519
S316-6209-2PES316 stainless steelSealed458519
S316-6309316 stainless steelOpen4510025
S316-6309-2PES316 stainless steelSealed4510025
S316-6810316 stainless steelOpen50657
S316-6810-2PES316 stainless steelSealed50657
S316-6910316 stainless steelOpen507212
S316-6910-2PES316 stainless steelSealed507212
S316-6010316 stainless steelOpen508016
S316-6010-2PES316 stainless steelSealed508016
S316-6210316 stainless steelOpen509020
S316-6210-2PES316 stainless steelSealed509020
S316-6310316 stainless steelOpen5011027
S316-6310-2PES316 stainless steelSealed5011027

On a phone, scroll the table sideways. Search matches model text; it does not establish replacement compatibility. No stock, price or application approval is implied.

Read the whole variant, including its width

Use the full S316 reference when recording a candidate. Open and sealed entries are separate variants even when their dimensions agree. The table does not convert a 316 construction into an equivalent 440-grade bearing.

This is a dimension and construction lookup. Confirm the exact cage, closure, lubricant, clearance and duty limits before use. Empty results and unreported properties remain unknown, not zero.

What this table does not approve

  • No automatic bicycle, vehicle, spindle or reel fitment is inferred from matching dimensions.
  • No generic temperature or maximum-speed rating is applied across these references.
  • No full-complement load or speed multiplier is inferred from a family-page note; obtain the exact construction's ratings.
  • Source-table and linked-document dimension conflicts are withheld pending verification.

Technical basis: SMB Bearings Marine Grade 316 Stainless Steel Bearings, public metric reference tables. BearingScope has reorganised the dimensional facts for independent lookup. Source references and capture history are retained in the verification record.

Search the recorded model candidates

325 loaded records in this table. Dimensions are d×D×B in mm. Filters narrow this snapshot immediately; open the exact product for its retained ratings and source description.

Showing 1–24 of 325 records. Filter or choose next to load more.

Brand / full modeld×D×B (mm)Original descriptionClosureClearancePrecision
SKF
W 618/1		1×3×1Stainless steel deep groove ball bearingWithoutCNNot reported
SKF
W 618/1.5		1.5×4×1.2Stainless steel deep groove ball bearingWithoutCNNot reported
SKF
W 638/1.5-2Z		1.5×4×2Stainless steel deep groove ball bearing with integral sealingShield on both sidesCNNot reported
SKF
W 617/2		2×4×1.2Stainless steel deep groove ball bearingWithoutCNNot reported
SKF
W 618/2		2×5×1.5Stainless steel deep groove ball bearingWithoutCNNot reported
SKF
W 638/2-2Z		2×5×2.3Stainless steel deep groove ball bearing with integral sealingShield on both sidesCNNot reported
SKF
W 638/2 X-2Z		2×5×2.5Stainless steel deep groove ball bearing with integral sealingShield on both sidesCNNot reported
SKF
W 619/2		2×6×2.3Stainless steel deep groove ball bearingWithoutCNNot reported
SKF
W 639/2-2Z		2×6×3Stainless steel deep groove ball bearing with integral sealingShield on both sidesCNNot reported
SKF
W 638/2.5-2Z		2.5×6×2.6Stainless steel deep groove ball bearing with integral sealingShield on both sidesCNNot reported
SKF
W 619/2.5		2.5×7×2.5Stainless steel deep groove ball bearingWithoutCNNot reported
SKF
W 630/2.5-2Z		2.5×8×4Stainless steel deep groove ball bearing with integral sealingShield on both sidesCNNot reported
SKF
W 627/3 R-2Z		3×6×2.5Stainless steel deep groove ball bearing with flanged outer ring and integral sealingShield on both sidesCNNot reported
SKF
W 627/3-2Z		3×6×2.5Stainless steel deep groove ball bearing with integral sealingShield on both sidesCNNot reported
SKF
W 637/3-2Z		3×6×3Stainless steel deep groove ball bearing with integral sealingShield on both sidesCNNot reported
SKF
W 618/3		3×7×2Stainless steel deep groove ball bearingWithoutCNNot reported
SKF
W 638/3-2RS1		3×7×3Stainless steel deep groove ball bearing with integral sealingSeal on both sidesCNNot reported
SKF
W 638/3-2Z		3×7×3Stainless steel deep groove ball bearing with integral sealingShield on both sidesCNNot reported
SKF
W 619/3-2Z		3×8×3Stainless steel deep groove ball bearing with integral sealingShield on both sidesCNNot reported
SKF
W 639/3-2RS1		3×8×4Stainless steel deep groove ball bearing with integral sealingSeal on both sidesCNNot reported
SKF
W 639/3-2Z		3×8×4Stainless steel deep groove ball bearing with integral sealingShield on both sidesCNNot reported
SKF
W 623		3×10×4Stainless steel deep groove ball bearingWithoutCNNot reported
SKF
W 623 R-2Z		3×10×4Stainless steel deep groove ball bearing with flanged outer ring and integral sealingShield on both sidesCNNot reported
SKF
W 623-2RS1		3×10×4Stainless steel deep groove ball bearing with integral sealingSeal on both sidesCNNot reported

Catalogue snapshot: 2026-10-01T16:36:30+00:00. Unknown properties are not inferred. This list is neither live availability nor replacement approval.

Questions to settle before selecting a model

Is a sealed stainless bearing waterproof?

No universal waterproof rating follows from those words. Integral closures, housing seals, pressure and exposure conditions must all be checked.

Is 316 always a better bearing material than 440C?

No. Corrosion resistance and mechanical suitability are different requirements. Use the actual product ratings and chemical conditions rather than ranking by alloy number alone.

Does a 316 housing mean 316 balls and raceways?

No. The NSK mounted-range example uses a 316 housing with a 440C-equivalent insert. Read the component specification.

Does NU 316 mean a stainless-steel grade?

No. In that search, 316 is part of a bearing designation. Do not classify NU 316 or NJ 304 as an alloy based on the number alone.

Reviewed 2026-10-02. Technical basis: NSK Stainless Steel Units and Corrosion-Resistant Mounted Units; NSK SPACEA corrosion-resistant bearings; SMB bearing-material guidance; BearingScope original manufacturer-record snapshot. Original BearingScope explanations and checklists. Product-specific approval remains necessary.

Practical selection workflow

What to check

01

Record the environment

Specify chemicals, concentration, wet/dry cycles, temperature and cleaning procedure; material suitability depends on actual exposure.

02

Check every component

Ring and ball materials, cage, seals, lubricant and housing can have different limits. Corrosion resistance is a system requirement.

03

Verify recorded evidence

Use the material filter and complete drawing. Do not classify a shiny, coated or unlabelled bearing as stainless.

Continue with real catalogue data

Structural family catalogue →Dimension lookup →Materials and design comparisons →Application checklists →

Preserve the full model, source description and unknown fields when making your shortlist. This reference website does not sell bearings or certify a replacement.

Related questions and tools

Miniature & small ball bearings

Small size does not remove the need to specify load, closure and mounting tolerances.

Read and apply →

Thin-section & thin-wall bearing selection

A small cross section is a design characteristic, not a statement that every thin bearing is interchangeable.

Read and apply →

Flanged bearings: ring flanges vs flanged housing units

A flange on a miniature bearing ring is not the same component as a two-bolt or four-bolt flanged housing.

Read and apply →

Ceramic, hybrid & steel bearing selection

Separate rolling-element material from ring material and the complete bearing construction.

Read and apply →

Air & gas bearings: selection requirements and data limits

Air-film systems are not ordinary rolling bearings with an interchangeable part number.

Read and apply →

Magnetic bearing systems: selection & comparison limits

A magnetic bearing is part of a rotor support and control system, not a simple size replacement for a ball bearing.

Read and apply →

Hydrodynamic journal bearings & plain-bearing selection

A journal-bearing system depends on the sliding geometry and lubricant film, not a rolling-bearing L10 calculation alone.

Read and apply →

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.

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