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NU 318 bearing dimensions & suffix variants

Look up recorded dimensions for designations beginning with NU 318. The table retains complete manufacturer designations so special suffixes and different dimensional variants remain visible.

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Find by measured dimensions

Enter bore d, outside diameter D and width B. Use decimals or inch fractions such as 1/2 or 1 1/4.

Exact model evidence

NU 318 dimensions and recorded technical data

The recorded NU 318 base designation measures 90×190×43 mm (inside diameter d × outside diameter D × width B). This answer uses unsuffixed records from NTN. It does not assign the same dimensions or operating ratings to every suffix.

The numeric series boundary is preserved: a longer number is not included merely because its first digits match. 22 recorded variants are listed. A dash means the value is missing, not zero.

Exact designation reference

Catalogue parameters for NU 318

Choose the complete brand and marking before reading a value. These source-labelled records add dimensions, construction and engineering properties where they were recorded; a shared model number does not establish interchangeability.

Units, ranges and minimum/maximum qualifiers are retained. The data is a dated catalogue reference, not a certified drawing, a complete current specification or an operating approval.

NTN NU318

NTN NU318 — 24 recorded parameters

Single row cylindrical roller bearings

Reference: NTN Europe public product catalogue; source snapshot 2026-10-02.

For this exact NTN NU318 record, the nominal envelope is 90×190×43 mm (d = internal diameter; D = external diameter; B = bearing/inner ring width). These are bearing or washer dimensions, not shaft/housing fit limits.

Calculated inch equivalent: 3.543307×7.480315×1.692913 in, in the same axis order. The conversion uses exactly 25.4 mm per inch and rounds to six decimals; it is not an inch-series designation or a machining tolerance.

Keep the prefix when matching this cylindrical roller bearing. The source construction below, including any axial-load direction statement, belongs only to the complete recorded designation; a similar NU, NJ or NUP number is not an approved substitute.

Use grease- and oil-qualified speed entries only for the named lubrication condition. Dynamic C and static C0 are catalogue ratings, not a universal safe load or installation approval; shoulder and fillet limits are separate from boundary size.

Dimensions and properties

Parameter	Source symbol	Recorded value
Internal diameter	d	90 mm
External diameter	D	190 mm
Bearing/Inner ring width	B	43 mm
Upper roller diameter	E	165 mm
Under roller diameter	F	115 mm
Min fillet radius	rs	3 mm
Min fillet radius	r1s	3 mm
Radial clearance class	Not separately recorded	CN
Mass	Not separately recorded	5.3 kg

Performance

Parameter	Source symbol	Recorded value
Dynamic load	C	266 kN
Static load	C0	265 kN
Fatigue limit load	Cu	29.3 kN
Oil lubrication limit speed	N lim	4300 r/min
Grease lubrication limit speed	N lim	3700 r/min
Min operating temperature	Tmin	-40 °C
Max operating temperature	Tmax	120 °C

Mounting dimensions

Parameter	Source symbol	Recorded value
Min shoulder diameter IR	da min	103 mm
Small face shoulder max diameter	da max	111 mm
Min inner ring GO diameter	db min	117 mm
Max shoulder diameter OR	Da max	177 mm
Max fillet radius	ra max	2.5 mm
Max fillet radius	r1a	2.5 mm

Product characteristics

Parameter	Source symbol	Recorded value
Catalogue construction	Not separately recorded	Single row cylindrical roller bearing, floating, separable, pressed steel cage
Cage construction	Not separately recorded	pressed steel cage

Open NTN NU318 product record →

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Brand / full designation	Named dimensions (mm / in)	Dynamic C (kN)	Static C0 (kN)	Reference speed (rpm)	Limiting speed (rpm)	Mass (kg / g)
NTNNU318Cylindrical roller bearing	Internal diameter (d) 90 mm 3.543307 in External diameter (D) 190 mm 7.480315 in Bearing/Inner ring width (B) 43 mm 1.692913 in	266 kN	265 kN	—	—	5.3 kg5300 g
SKFNU 318 ECJSingle row cylindrical roller bearing, NU design	Bore diameter (d) 90 mm 3.543307 in Outside diameter (D) 190 mm 7.480315 in Width (B) 43 mm 1.692913 in	365 kN	360 kN	3800 rpm	4500 rpm	5.28 kg5280 g
SKFNU 318 ECJ/C3Single row cylindrical roller bearing, NU design	Recorded bore (d) 90 mm 3.543307 in Recorded outside dimension (D) 190 mm 7.480315 in Catalogue width (symbol unverified) 43 mm 1.692913 in	365 kN	360 kN	3800 rpm	4500 rpm	5.28 kg5280 g
SKFNU 318 ECMSingle row cylindrical roller bearing, NU design	Bore diameter (d) 90 mm 3.543307 in Outside diameter (D) 190 mm 7.480315 in Width (B) 43 mm 1.692913 in	365 kN	360 kN	3800 rpm	4500 rpm	6.03 kg6030 g
SKFNU 318 ECM/C3Single row cylindrical roller bearing, NU design	Recorded bore (d) 90 mm 3.543307 in Recorded outside dimension (D) 190 mm 7.480315 in Catalogue width (symbol unverified) 43 mm 1.692913 in	365 kN	360 kN	3800 rpm	4500 rpm	6.14 kg6140 g
SKFNU 318 ECM/C3VL0241INSOCOAT single row cylindrical roller bearing, NU design	Bore diameter (d) 90 mm 3.543307 in Outside diameter (D) 190 mm 7.480315 in Width (B) 43 mm 1.692913 in	365 kN	360 kN	3800 rpm	4500 rpm	6 kg6000 g
SKFNU 318 ECM/C4VA301Single row cylindrical roller bearing, NU design	Recorded bore (d) 90 mm 3.543307 in Recorded outside dimension (D) 190 mm 7.480315 in Catalogue width (symbol unverified) 43 mm 1.692913 in	365 kN	360 kN	3800 rpm	4500 rpm	6.28 kg6280 g
SKFNU 318 ECMLSingle row cylindrical roller bearing, NU design	Bore diameter (d) 90 mm 3.543307 in Outside diameter (D) 190 mm 7.480315 in Width (B) 43 mm 1.692913 in	365 kN	360 kN	3800 rpm	6700 rpm	5.91 kg5910 g
SKFNU 318 ECPSingle row cylindrical roller bearing, NU design	Bore diameter (d) 90 mm 3.543307 in Outside diameter (D) 190 mm 7.480315 in Width (B) 43 mm 1.692913 in	365 kN	360 kN	3800 rpm	4500 rpm	5.25 kg5250 g
SKFNU 318 ECP/C3Single row cylindrical roller bearing, NU design	Recorded bore (d) 90 mm 3.543307 in Recorded outside dimension (D) 190 mm 7.480315 in Catalogue width (symbol unverified) 43 mm 1.692913 in	365 kN	360 kN	3800 rpm	4500 rpm	5.25 kg5250 g
FAGNU318-E-XL-M1Cylindrical roller bearing	Bore diameter (d) 90 mm 3.543307 in Outside diameter (D) 190 mm 7.480315 in Width (B) 43 mm 1.692913 in	370 kN	350 kN	3650 rpm	6300 rpm	6.285 kg6285 g
FAGNU318-E-XL-TVP2Cylindrical roller bearing	Bore diameter (d) 90 mm 3.543307 in Outside diameter (D) 190 mm 7.480315 in Width (B) 43 mm 1.692913 in	370 kN	350 kN	3650 rpm	4900 rpm	5.3 kg5300 g
FAGNU318-E-XL-TVP2-C4Cylindrical roller bearing	Bore diameter (d) 90 mm 3.543307 in Outside diameter (D) 190 mm 7.480315 in Width (B) 43 mm 1.692913 in	370 kN	350 kN	3650 rpm	4900 rpm	5.244 kg5244 g
TIMKENNU318EJCylindrical roller bearing	Recorded bore (d) 90 mm 3.543307 in Recorded outside dimension (D) 190 mm 7.480315 in Catalogue width (symbol unverified) 43 mm 1.692913 in	359 kN	362 kN	—	—	5.3 kg5300 g
TIMKENNU318EJC3Cylindrical roller bearing	Recorded bore (d) 90 mm 3.543307 in Recorded outside dimension (D) 190 mm 7.480315 in Catalogue width (symbol unverified) 43 mm 1.692913 in	359 kN	362 kN	—	—	5.3 kg5300 g
TIMKENNU318EJC4Cylindrical roller bearing	Recorded bore (d) 90 mm 3.543307 in Recorded outside dimension (D) 190 mm 7.480315 in Catalogue width (symbol unverified) 43 mm 1.692913 in	359 kN	362 kN	—	—	5.3 kg5300 g
TIMKENNU318EMACylindrical roller bearing	Recorded bore (d) 90 mm 3.543307 in Recorded outside dimension (D) 190 mm 7.480315 in Catalogue width (symbol unverified) 43 mm 1.692913 in	359 kN	362 kN	—	—	6 kg6000 g
TIMKENNU318EMAC3Cylindrical roller bearing	Recorded bore (d) 90 mm 3.543307 in Recorded outside dimension (D) 190 mm 7.480315 in Catalogue width (symbol unverified) 43 mm 1.692913 in	359 kN	362 kN	—	—	6 kg6000 g
TIMKENNU318EMAC4Cylindrical roller bearing	Recorded bore (d) 90 mm 3.543307 in Recorded outside dimension (D) 190 mm 7.480315 in Catalogue width (symbol unverified) 43 mm 1.692913 in	359 kN	362 kN	—	—	6 kg6000 g
NSKNU318EMCylindrical roller bearing	Bore diameter (d) 90 mm 3.543307 in Outside diameter (D) 190 mm 7.480315 in Bearing width (B) 43 mm 1.692913 in	390 kN	355 kN	—	—	—
NSKNU318WCylindrical roller bearing	Bore diameter (d) 90 mm 3.543307 in Outside diameter (D) 190 mm 7.480315 in Bearing width (B) 43 mm 1.692913 in	295 kN	265 kN	—	—	—
KOYONU318RCylindrical roller bearing	Bore diameter (d) 90 mm 3.543307 in Outside diameter (D) 190 mm 7.480315 in Width (B) 43 mm 1.692913 in	395 kN	355 kN	—	3100 rpmLimiting Speeds(Grease Lub.): 3100 min-1Limiting Speeds(Oil Lub.): 4100 min-1	5.47 kg5470 g

Compare recorded seals, clearance, precision and materials

Manufacturer wording is retained. A missing property is not inferred from another brand or a similar suffix.

Brand / designation	Closure	Original precision	Clearance	Cage	Material	Lubricant
NTN NU318	Not recorded	Not recorded	CN	pressed steel cage	Not recorded	Not recorded
SKF NU 318 ECJ	Without	Not recorded	CN	Sheet metal	Not recorded	None
SKF NU 318 ECJ/C3	Without	Not recorded	C3	Sheet metal	Not recorded	None
SKF NU 318 ECM	Without	Not recorded	CN	Machined brass	Not recorded	None
SKF NU 318 ECM/C3	Without	Not recorded	C3	Machined brass	Not recorded	None
SKF NU 318 ECM/C3VL0241	Without	Not recorded	C3	Machined brass	Bearing steel	None
SKF NU 318 ECM/C4VA301	Without	Not recorded	C4	Machined brass	Not recorded	None
SKF NU 318 ECML	Without	Not recorded	CN	Machined brass	Not recorded	None
SKF NU 318 ECP	Without	Not recorded	CN	Non-metallic	Not recorded	None
SKF NU 318 ECP/C3	Without	Not recorded	C3	Non-metallic	Not recorded	None
FAG NU318-E-XL-M1	Not recorded	PN — Normal (ISO 492:2023)	CN (Group N) — Normal internal clearance	M1 — Two Piece Brass Cage Roller Guided	Not recorded	Not recorded
FAG NU318-E-XL-TVP2	Not recorded	PN — Normal (ISO 492:2023)	CN (Group N) — Normal internal clearance	TVP2 — Solid Window Cage made from PA66	Not recorded	Not recorded
FAG NU318-E-XL-TVP2-C4	Not recorded	PN — Normal (ISO 492:2023)	C4 (Group 4) — Internal clearance larger than C3	TVP2 — Solid Window Cage made from PA66	Not recorded	Not recorded
TIMKEN NU318EJ	Open	Not recorded	Not recorded	Window Steel cage	Not recorded	Not recorded
TIMKEN NU318EJC3	Open	Not recorded	Not recorded	Window Steel cage	Not recorded	Not recorded
TIMKEN NU318EJC4	Open	Not recorded	Not recorded	Window Steel cage	Not recorded	Not recorded
TIMKEN NU318EMA	Open	Not recorded	Not recorded	Window Brass cage	Not recorded	Not recorded
TIMKEN NU318EMAC3	Open	Not recorded	Not recorded	Window Brass cage	Not recorded	Not recorded
TIMKEN NU318EMAC4	Open	Not recorded	Not recorded	Window Brass cage	Not recorded	Not recorded
NSK NU318EM	Not recorded	Not recorded	Not recorded	Machined brass	Not recorded	Not recorded
NSK NU318W	Not recorded	Not recorded	Not recorded	Pressed steel	Not recorded	Not recorded
KOYO NU318R	Not recorded	Not recorded	Not recorded	Not recorded	Not recorded	Not recorded

How to compare these values

Use the displayed dimension names and original symbols. Housing length L, height H2 and flange width are not bearing outside diameter D. A catalogue width with an unverified symbol must not be assumed to be inner-ring width B or assembly width T. Open the product record for mounting dimensions and geometry.
Inch values are calculated from the recorded millimetres using 25.4 mm per inch, rounded to six decimal places. They do not change a metric bearing into an inch-series bearing. Gram values are converted from the recorded mass in kilograms.
C and C0 describe different rating conditions. They are not a single safe working-load limit and cannot replace an application load calculation.
Reference and limiting speeds are separate catalogue values. The source grease/oil context is shown where recorded. Lubricant, seals, loads, fit, clearance and cooling affect the usable operating speed.
A common base number does not prove equivalent seals, clearance, precision, material or interchangeability. Open the full designation for these fields.

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Related prefix matches — other model numbers may appear

These discovery results can contain a longer number or a different component. They are not specifications for the requested exact model. Open the complete product to inspect its original geometry.

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