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NJ 308 bearing dimensions & suffix variants

Look up recorded dimensions for designations beginning with NJ 308. 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

NJ 308 dimensions and recorded technical data

The recorded NJ 308 base designation measures 40×90×23 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. 13 recorded variants are listed. A dash means the value is missing, not zero.

Exact designation reference

Catalogue parameters for NJ 308

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 NJ308

NTN NJ308 — 24 recorded parameters

Single row cylindrical roller bearings

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

For this exact NTN NJ308 record, the nominal envelope is 40×90×23 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: 1.574803×3.543307×0.905512 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	40 mm
External diameter	D	90 mm
Bearing/Inner ring width	B	23 mm
Upper roller diameter	E	77.5 mm
Under roller diameter	F	53.5 mm
IR flange outer diameter	d1	58.4 mm
Min fillet radius	rs	1.5 mm
Min fillet radius	r1s	1.5 mm
Radial clearance class	Not separately recorded	CN
Mass	Not separately recorded	0.671 kg

Performance

Parameter	Source symbol	Recorded value
Dynamic load	C	65 kN
Static load	C0	57 kN
Fatigue limit load	Cu	6.95 kN
Oil lubrication limit speed	N lim	9400 r/min
Grease lubrication limit speed	N lim	8000 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	48 mm
Small face shoulder max diameter	da max	51 mm
Min inner ring GO diameter	dc min	60 mm
Max shoulder diameter OR	Da max	82 mm
Max fillet radius	ra max	1.5 mm

Product characteristics

Parameter	Source symbol	Recorded value
Catalogue construction	Not separately recorded	Single row cylindrical roller bearing, single direction for axial loads, separable, pressed steel cage.
Cage construction	Not separately recorded	pressed steel cage.

Open NTN NJ308 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)
NTNNJ308Cylindrical roller bearing	Internal diameter (d) 40 mm 1.574803 in External diameter (D) 90 mm 3.543307 in Bearing/Inner ring width (B) 23 mm 0.905512 in	65 kN	57 kN	—	—	0.671 kg671 g
SKFNJ 308 ECJSingle row cylindrical roller bearing, NJ design	Bore diameter (d) 40 mm 1.574803 in Outside diameter (D) 90 mm 3.543307 in Width (B) 23 mm 0.905512 in	93 kN	78 kN	8000 rpm	9500 rpm	0.68 kg680 g
SKFNJ 308 ECJ/C3Single row cylindrical roller bearing, NJ design	Recorded bore (d) 40 mm 1.574803 in Recorded outside dimension (D) 90 mm 3.543307 in Catalogue width (symbol unverified) 23 mm 0.905512 in	93 kN	78 kN	8000 rpm	9500 rpm	0.68 kg680 g
SKFNJ 308 ECMSingle row cylindrical roller bearing, NJ design	Bore diameter (d) 40 mm 1.574803 in Outside diameter (D) 90 mm 3.543307 in Width (B) 23 mm 0.905512 in	93 kN	78 kN	8000 rpm	9500 rpm	0.789 kg789 g
SKFNJ 308 ECMLSingle row cylindrical roller bearing, NJ design	Bore diameter (d) 40 mm 1.574803 in Outside diameter (D) 90 mm 3.543307 in Width (B) 23 mm 0.905512 in	93 kN	78 kN	8000 rpm	15000 rpm	0.742 kg742 g
SKFNJ 308 ECPSingle row cylindrical roller bearing, NJ design	Bore diameter (d) 40 mm 1.574803 in Outside diameter (D) 90 mm 3.543307 in Width (B) 23 mm 0.905512 in	93 kN	78 kN	8000 rpm	9500 rpm	0.666 kg666 g
SKFNJ 308 ECP/C3Single row cylindrical roller bearing, NJ design	Recorded bore (d) 40 mm 1.574803 in Recorded outside dimension (D) 90 mm 3.543307 in Catalogue width (symbol unverified) 23 mm 0.905512 in	93 kN	78 kN	8000 rpm	9500 rpm	0.666 kg666 g
SKFNJ 308 ECP/C4Single row cylindrical roller bearing, NJ design	Recorded bore (d) 40 mm 1.574803 in Recorded outside dimension (D) 90 mm 3.543307 in Catalogue width (symbol unverified) 23 mm 0.905512 in	93 kN	78 kN	8000 rpm	9500 rpm	0.652 kg652 g
SKFNJ 308 ECPHSingle row cylindrical roller bearing, NJ design	Bore diameter (d) 40 mm 1.574803 in Outside diameter (D) 90 mm 3.543307 in Width (B) 23 mm 0.905512 in	93 kN	78 kN	8000 rpm	9500 rpm	0.666 kg666 g
FAGNJ308-E-XL-M1Cylindrical roller bearing	Bore diameter (d) 40 mm 1.574803 in Outside diameter (D) 90 mm 3.543307 in Width (B) 23 mm 0.905512 in	96 kN	79 kN	7100 rpm	14200 rpm	0.764 kg764 g
FAGNJ308-E-XL-TVP2Cylindrical roller bearing	Bore diameter (d) 40 mm 1.574803 in Outside diameter (D) 90 mm 3.543307 in Width (B) 23 mm 0.905512 in	96 kN	79 kN	7100 rpm	10900 rpm	0.654 kg654 g
NSKNJ308EWCylindrical roller bearing	Bore diameter (d) 40 mm 1.574803 in Outside diameter (D) 90 mm 3.543307 in Bearing width (B) 23 mm 0.905512 in	102 kN	81.5 kN	—	—	—
KOYONJ308RCylindrical roller bearing	Bore diameter (d) 40 mm 1.574803 in Outside diameter (D) 90 mm 3.543307 in Width (B) 23 mm 0.905512 in	104 kN	81.5 kN	—	6800 rpmLimiting Speeds(Grease Lub.): 6800 min-1Limiting Speeds(Oil Lub.): 9100 min-1	0.687 kg687 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 NJ308	Not recorded	Not recorded	CN	pressed steel cage.	Not recorded	Not recorded
SKF NJ 308 ECJ	Without	Not recorded	CN	Sheet metal	Not recorded	None
SKF NJ 308 ECJ/C3	Without	Not recorded	C3	Sheet metal	Not recorded	None
SKF NJ 308 ECM	Without	Not recorded	CN	Machined brass	Not recorded	None
SKF NJ 308 ECML	Without	Not recorded	CN	Machined brass	Not recorded	None
SKF NJ 308 ECP	Without	Not recorded	CN	Non-metallic	Not recorded	None
SKF NJ 308 ECP/C3	Without	Not recorded	C3	Non-metallic	Not recorded	None
SKF NJ 308 ECP/C4	Without	Not recorded	C4	Non-metallic	Not recorded	None
SKF NJ 308 ECPH	Without	Not recorded	CN	Non-metallic	Not recorded	None
FAG NJ308-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 NJ308-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
NSK NJ308EW	Not recorded	Not recorded	Not recorded	Pressed steel	Not recorded	Not recorded
KOYO NJ308R	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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