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NJ 311 bearing dimensions & suffix variants

Look up recorded dimensions for designations beginning with NJ 311. 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 311 dimensions and recorded technical data

Use the named dimensions for each complete record below. A generic d×D×B answer is not asserted where the base record is missing, dimension symbols are unverified, or the product uses a different geometry such as a housing or thrust assembly. Suffix records are not substituted for a missing base specification.

The numeric series boundary is preserved: a longer number is not included merely because its first digits match. 11 recorded variants are listed. A dash means the value is missing, not zero.

Brand / full designation	Named dimensions (mm / in)	Dynamic C (kN)	Static C0 (kN)	Reference speed (rpm)	Limiting speed (rpm)	Mass (kg / g)
SKFNJ 311 ECJSingle row cylindrical roller bearing, NJ design	Bore diameter (d) 55 mm 2.165354 in Outside diameter (D) 120 mm 4.724409 in Width (B) 29 mm 1.141732 in	156 kN	143 kN	6000 rpm	7000 rpm	1.53 kg1530 g
SKFNJ 311 ECJ/C3Single row cylindrical roller bearing, NJ design	Recorded bore (d) 55 mm 2.165354 in Recorded outside dimension (D) 120 mm 4.724409 in Catalogue width (symbol unverified) 29 mm 1.141732 in	156 kN	143 kN	6000 rpm	7000 rpm	1.53 kg1530 g
SKFNJ 311 ECMSingle row cylindrical roller bearing, NJ design	Bore diameter (d) 55 mm 2.165354 in Outside diameter (D) 120 mm 4.724409 in Width (B) 29 mm 1.141732 in	156 kN	143 kN	6000 rpm	7000 rpm	1.76 kg1760 g
SKFNJ 311 ECMLSingle row cylindrical roller bearing, NJ design	Bore diameter (d) 55 mm 2.165354 in Outside diameter (D) 120 mm 4.724409 in Width (B) 29 mm 1.141732 in	156 kN	143 kN	6000 rpm	11000 rpm	1.65 kg1650 g
SKFNJ 311 ECPSingle row cylindrical roller bearing, NJ design	Bore diameter (d) 55 mm 2.165354 in Outside diameter (D) 120 mm 4.724409 in Width (B) 29 mm 1.141732 in	156 kN	143 kN	6000 rpm	7000 rpm	1.5 kg1500 g
SKFNJ 311 ECP/C3Single row cylindrical roller bearing, NJ design	Recorded bore (d) 55 mm 2.165354 in Recorded outside dimension (D) 120 mm 4.724409 in Catalogue width (symbol unverified) 29 mm 1.141732 in	156 kN	143 kN	6000 rpm	7000 rpm	1.46 kg1460 g
SKFNJ 311 ECP/C4Single row cylindrical roller bearing, NJ design	Recorded bore (d) 55 mm 2.165354 in Recorded outside dimension (D) 120 mm 4.724409 in Catalogue width (symbol unverified) 29 mm 1.141732 in	156 kN	143 kN	6000 rpm	7000 rpm	1.5 kg1500 g
FAGNJ311-E-XL-M1Cylindrical roller bearing	Bore diameter (d) 55 mm 2.165354 in Outside diameter (D) 120 mm 4.724409 in Width (B) 29 mm 1.141732 in	159 kN	139 kN	5500 rpm	10400 rpm	1.67 kg1670 g
FAGNJ311-E-XL-TVP2Cylindrical roller bearing	Bore diameter (d) 55 mm 2.165354 in Outside diameter (D) 120 mm 4.724409 in Width (B) 29 mm 1.141732 in	159 kN	139 kN	5500 rpm	8000 rpm	1.48 kg1480 g
NSKNJ311EWCylindrical roller bearing	Bore diameter (d) 55 mm 2.165354 in Outside diameter (D) 120 mm 4.724409 in Bearing width (B) 29 mm 1.141732 in	169 kN	143 kN	—	—	—
KOYONJ311RCylindrical roller bearing	Bore diameter (d) 55 mm 2.165354 in Outside diameter (D) 120 mm 4.724409 in Width (B) 29 mm 1.141732 in	172 kN	143 kN	—	5100 rpmLimiting Speeds(Grease Lub.): 5100 min-1Limiting Speeds(Oil Lub.): 6700 min-1	1.54 kg1540 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
SKF NJ 311 ECJ	Without	Not recorded	CN	Sheet metal	Not recorded	None
SKF NJ 311 ECJ/C3	Without	Not recorded	C3	Sheet metal	Not recorded	None
SKF NJ 311 ECM	Without	Not recorded	CN	Machined brass	Not recorded	None
SKF NJ 311 ECML	Without	Not recorded	CN	Machined brass	Not recorded	None
SKF NJ 311 ECP	Without	Not recorded	CN	Non-metallic	Not recorded	None
SKF NJ 311 ECP/C3	Without	Not recorded	C3	Non-metallic	Not recorded	None
SKF NJ 311 ECP/C4	Without	Not recorded	C4	Non-metallic	Not recorded	None
FAG NJ311-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 NJ311-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 NJ311EW	Not recorded	Not recorded	Not recorded	Pressed steel	Not recorded	Not recorded
KOYO NJ311R	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.

SKF