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NU 324 bearing dimensions & suffix variants

Look up recorded dimensions for designations beginning with NU 324. 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 324 dimensions and recorded technical data

The recorded NU 324 base designation measures 120×260×55 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. 24 recorded variants are listed. A dash means the value is missing, not zero.

Exact designation reference

Catalogue parameters for NU 324

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 NU324

NTN NU324 — 24 recorded parameters

Single row cylindrical roller bearings

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

For this exact NTN NU324 record, the nominal envelope is 120×260×55 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: 4.724409×10.236220×2.165354 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	120 mm
External diameter	D	260 mm
Bearing/Inner ring width	B	55 mm
Upper roller diameter	E	226 mm
Under roller diameter	F	154 mm
Min fillet radius	rs	3 mm
Min fillet radius	r1s	3 mm
Radial clearance class	Not separately recorded	CN
Mass	Not separately recorded	12.8 kg

Performance

Parameter	Source symbol	Recorded value
Dynamic load	C	500 kN
Static load	C0	510 kN
Fatigue limit load	Cu	51 kN
Oil lubrication limit speed	N lim	3200 r/min
Grease lubrication limit speed	N lim	2700 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	133 mm
Small face shoulder max diameter	da max	151 mm
Min inner ring GO diameter	db min	156 mm
Max shoulder diameter OR	Da max	247 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 NU324 product record →

Clearance tables →Precision classes →Load calculations →Interchange checks →

Brand / full designation	Named dimensions (mm / in)	Dynamic C (kN)	Static C0 (kN)	Reference speed (rpm)	Limiting speed (rpm)	Mass (kg / g)
NTNNU324Cylindrical roller bearing	Internal diameter (d) 120 mm 4.724409 in External diameter (D) 260 mm 10.23622 in Bearing/Inner ring width (B) 55 mm 2.165354 in	500 kN	510 kN	—	—	12.8 kg12800 g
SKFNU 324 ECJSingle row cylindrical roller bearing, NU design	Bore diameter (d) 120 mm 4.724409 in Outside diameter (D) 260 mm 10.23622 in Width (B) 55 mm 2.165354 in	610 kN	620 kN	2800 rpm	3200 rpm	13.1 kg13100 g
SKFNU 324 ECJ/C3Single row cylindrical roller bearing, NU design	Recorded bore (d) 120 mm 4.724409 in Recorded outside dimension (D) 260 mm 10.23622 in Catalogue width (symbol unverified) 55 mm 2.165354 in	610 kN	620 kN	2800 rpm	3200 rpm	12.9 kg12900 g
SKFNU 324 ECMSingle row cylindrical roller bearing, NU design	Bore diameter (d) 120 mm 4.724409 in Outside diameter (D) 260 mm 10.23622 in Width (B) 55 mm 2.165354 in	610 kN	620 kN	2800 rpm	3200 rpm	14.6 kg14600 g
SKFNU 324 ECM/C3Single row cylindrical roller bearing, NU design	Recorded bore (d) 120 mm 4.724409 in Recorded outside dimension (D) 260 mm 10.23622 in Catalogue width (symbol unverified) 55 mm 2.165354 in	610 kN	620 kN	2800 rpm	3200 rpm	14.6 kg14600 g
SKFNU 324 ECM/C3VL0241INSOCOAT single row cylindrical roller bearing, NU design	Bore diameter (d) 120 mm 4.724409 in Outside diameter (D) 260 mm 10.23622 in Width (B) 55 mm 2.165354 in	610 kN	620 kN	2800 rpm	3200 rpm	14.6 kg14600 g
SKFNU 324 ECM/C4VA301Single row cylindrical roller bearing, NU design	Recorded bore (d) 120 mm 4.724409 in Recorded outside dimension (D) 260 mm 10.23622 in Catalogue width (symbol unverified) 55 mm 2.165354 in	610 kN	620 kN	2800 rpm	3200 rpm	14.6 kg14600 g
SKFNU 324 ECM/C4VA3091INSOCOAT single row cylindrical roller bearing, NU design	Recorded bore (d) 120 mm 4.724409 in Recorded outside dimension (D) 260 mm 10.23622 in Catalogue width (symbol unverified) 55 mm 2.165354 in	610 kN	620 kN	2800 rpm	3200 rpm	14.6 kg14600 g
SKFNU 324 ECMLSingle row cylindrical roller bearing, NU design	Bore diameter (d) 120 mm 4.724409 in Outside diameter (D) 260 mm 10.23622 in Width (B) 55 mm 2.165354 in	610 kN	620 kN	2800 rpm	5000 rpm	14.8 kg14800 g
SKFNU 324 ECML/C3Single row cylindrical roller bearing, NU design	Recorded bore (d) 120 mm 4.724409 in Recorded outside dimension (D) 260 mm 10.23622 in Catalogue width (symbol unverified) 55 mm 2.165354 in	610 kN	620 kN	2800 rpm	5000 rpm	14.8 kg14800 g
SKFNU 324 ECPSingle row cylindrical roller bearing, NU design	Bore diameter (d) 120 mm 4.724409 in Outside diameter (D) 260 mm 10.23622 in Width (B) 55 mm 2.165354 in	610 kN	620 kN	2800 rpm	3200 rpm	13 kg13000 g
SKFNU 324 ECP/C3Single row cylindrical roller bearing, NU design	Recorded bore (d) 120 mm 4.724409 in Recorded outside dimension (D) 260 mm 10.23622 in Catalogue width (symbol unverified) 55 mm 2.165354 in	610 kN	620 kN	2800 rpm	3200 rpm	13 kg13000 g
FAGNU324-E-XL-M1Cylindrical roller bearing	Bore diameter (d) 120 mm 4.724409 in Outside diameter (D) 260 mm 10.23622 in Width (B) 55 mm 2.165354 in	610 kN	600 kN	2650 rpm	4550 rpm	15.321 kg15321 g
FAGNU324-E-XL-MCACylindrical roller bearing	Bore diameter (d) 120 mm 4.724409 in Outside diameter (D) 260 mm 10.23622 in Width (B) 55 mm 2.165354 in	610 kN	600 kN	2650 rpm	4550 rpm	14.58 kg14580 g
FAGNU324-E-XL-MCA-C3Cylindrical roller bearing	Bore diameter (d) 120 mm 4.724409 in Outside diameter (D) 260 mm 10.23622 in Width (B) 55 mm 2.165354 in	610 kN	600 kN	2650 rpm	4550 rpm	14.57 kg14570 g
FAGNU324-E-XL-TVP2Cylindrical roller bearing	Bore diameter (d) 120 mm 4.724409 in Outside diameter (D) 260 mm 10.23622 in Width (B) 55 mm 2.165354 in	610 kN	600 kN	2650 rpm	3500 rpm	13.3 kg13300 g
TIMKENNU324EJCylindrical roller bearing	Recorded bore (d) 120 mm 4.724409 in Recorded outside dimension (D) 260 mm 10.23622 in Catalogue width (symbol unverified) 55 mm 2.165354 in	594 kN	614 kN	—	—	13 kg13000 g
TIMKENNU324EJC3Cylindrical roller bearing	Recorded bore (d) 120 mm 4.724409 in Recorded outside dimension (D) 260 mm 10.23622 in Catalogue width (symbol unverified) 55 mm 2.165354 in	594 kN	614 kN	—	—	13 kg13000 g
TIMKENNU324EJC4Cylindrical roller bearing	Recorded bore (d) 120 mm 4.724409 in Recorded outside dimension (D) 260 mm 10.23622 in Catalogue width (symbol unverified) 55 mm 2.165354 in	594 kN	614 kN	—	—	13 kg13000 g
TIMKENNU324EMACylindrical roller bearing	Recorded bore (d) 120 mm 4.724409 in Recorded outside dimension (D) 260 mm 10.23622 in Catalogue width (symbol unverified) 55 mm 2.165354 in	594 kN	614 kN	—	—	15 kg15000 g
TIMKENNU324EMAC3Cylindrical roller bearing	Recorded bore (d) 120 mm 4.724409 in Recorded outside dimension (D) 260 mm 10.23622 in Catalogue width (symbol unverified) 55 mm 2.165354 in	594 kN	614 kN	—	—	15 kg15000 g
TIMKENNU324EMAC4Cylindrical roller bearing	Recorded bore (d) 120 mm 4.724409 in Recorded outside dimension (D) 260 mm 10.23622 in Catalogue width (symbol unverified) 55 mm 2.165354 in	594 kN	614 kN	—	—	15 kg15000 g
NSKNU324EMCylindrical roller bearing	Bore diameter (d) 120 mm 4.724409 in Outside diameter (D) 260 mm 10.23622 in Bearing width (B) 55 mm 2.165354 in	650 kN	610 kN	—	—	—
KOYONU324RCylindrical roller bearing	Bore diameter (d) 120 mm 4.724409 in Outside diameter (D) 260 mm 10.23622 in Width (B) 55 mm 2.165354 in	660 kN	610 kN	—	2200 rpmLimiting Speeds(Grease Lub.): 2200 min-1Limiting Speeds(Oil Lub.): 3000 min-1	13.4 kg13400 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 NU324	Not recorded	Not recorded	CN	pressed steel cage	Not recorded	Not recorded
SKF NU 324 ECJ	Without	Not recorded	CN	Sheet metal	Not recorded	None
SKF NU 324 ECJ/C3	Without	Not recorded	C3	Sheet metal	Not recorded	None
SKF NU 324 ECM	Without	Not recorded	CN	Machined brass	Not recorded	None
SKF NU 324 ECM/C3	Without	Not recorded	C3	Machined brass	Not recorded	None
SKF NU 324 ECM/C3VL0241	Without	Not recorded	C3	Machined brass	Bearing steel	None
SKF NU 324 ECM/C4VA301	Without	Not recorded	C4	Machined brass	Not recorded	None
SKF NU 324 ECM/C4VA3091	Without	Not recorded	C4	Machined brass	Bearing steel	None
SKF NU 324 ECML	Without	Not recorded	CN	Machined brass	Not recorded	None
SKF NU 324 ECML/C3	Without	Not recorded	C3	Machined brass	Not recorded	None
SKF NU 324 ECP	Without	Not recorded	CN	Non-metallic	Not recorded	None
SKF NU 324 ECP/C3	Without	Not recorded	C3	Non-metallic	Not recorded	None
FAG NU324-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 NU324-E-XL-MCA	Not recorded	Not recorded	Not recorded	MCA — Messing Käfig, einteilig, bordgeführt am Außenring	Not recorded	Not recorded
FAG NU324-E-XL-MCA-C3	Not recorded	Not recorded	Not recorded	MCA — Messing Käfig, einteilig, bordgeführt am Außenring	Not recorded	Not recorded
FAG NU324-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
TIMKEN NU324EJ	Open	Not recorded	Not recorded	Window Steel cage	Not recorded	Not recorded
TIMKEN NU324EJC3	Open	Not recorded	Not recorded	Window Steel cage	Not recorded	Not recorded
TIMKEN NU324EJC4	Open	Not recorded	Not recorded	Window Steel cage	Not recorded	Not recorded
TIMKEN NU324EMA	Open	Not recorded	Not recorded	Window Brass cage	Not recorded	Not recorded
TIMKEN NU324EMAC3	Open	Not recorded	Not recorded	Window Brass cage	Not recorded	Not recorded
TIMKEN NU324EMAC4	Open	Not recorded	Not recorded	Window Brass cage	Not recorded	Not recorded
NSK NU324EM	Not recorded	Not recorded	Not recorded	Machined brass	Not recorded	Not recorded
KOYO NU324R	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.

Check load calculations →Estimate rating life →Decode the complete marking →Check replacement evidence →

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.

NTN

NU324

Cylindrical roller bearing

View full technical record →KOYO

NU3240

Cylindrical roller bearing

View full technical record →KOYO

NU3244

Cylindrical roller bearing

View full technical record →KOYO