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NU 309 bearing dimensions & suffix variants

Look up recorded dimensions for designations beginning with NU 309. 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 309 dimensions and recorded technical data

The recorded NU 309 base designation measures 45×100×25 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. 19 recorded variants are listed. A dash means the value is missing, not zero.

Exact designation reference

Catalogue parameters for NU 309

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 NU309

NTN NU309 — 24 recorded parameters

Single row cylindrical roller bearings

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

For this exact NTN NU309 record, the nominal envelope is 45×100×25 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: 1.771654×3.937008×0.984252 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	45 mm
External diameter	D	100 mm
Bearing/Inner ring width	B	25 mm
Upper roller diameter	E	86.5 mm
Under roller diameter	F	58.5 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	0.877 kg

Performance

Parameter	Source symbol	Recorded value
Dynamic load	C	82 kN
Static load	C0	71 kN
Fatigue limit load	Cu	8.65 kN
Oil lubrication limit speed	N lim	8400 r/min
Grease lubrication limit speed	N lim	7200 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	53 mm
Small face shoulder max diameter	da max	57 mm
Min inner ring GO diameter	db min	60 mm
Max shoulder diameter OR	Da max	92 mm
Max fillet radius	ra max	1.5 mm
Max fillet radius	r1a	1.5 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 NU309 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)
NTNNU309Cylindrical roller bearing	Internal diameter (d) 45 mm 1.771654 in External diameter (D) 100 mm 3.937008 in Bearing/Inner ring width (B) 25 mm 0.984252 in	82 kN	71 kN	—	—	0.877 kg877 g
SKFNU 309 ECJSingle row cylindrical roller bearing, NU design	Bore diameter (d) 45 mm 1.771654 in Outside diameter (D) 100 mm 3.937008 in Width (B) 25 mm 0.984252 in	112 kN	100 kN	7500 rpm	8500 rpm	0.891 kg891 g
SKFNU 309 ECJ/C3Single row cylindrical roller bearing, NU design	Recorded bore (d) 45 mm 1.771654 in Recorded outside dimension (D) 100 mm 3.937008 in Catalogue width (symbol unverified) 25 mm 0.984252 in	112 kN	100 kN	7500 rpm	8500 rpm	0.891 kg891 g
SKFNU 309 ECMSingle row cylindrical roller bearing, NU design	Bore diameter (d) 45 mm 1.771654 in Outside diameter (D) 100 mm 3.937008 in Width (B) 25 mm 0.984252 in	112 kN	100 kN	7500 rpm	8500 rpm	0.998 kg998 g
SKFNU 309 ECM/C3Single row cylindrical roller bearing, NU design	Recorded bore (d) 45 mm 1.771654 in Recorded outside dimension (D) 100 mm 3.937008 in Catalogue width (symbol unverified) 25 mm 0.984252 in	112 kN	100 kN	7500 rpm	8500 rpm	0.998 kg998 g
SKFNU 309 ECMLSingle row cylindrical roller bearing, NU design	Bore diameter (d) 45 mm 1.771654 in Outside diameter (D) 100 mm 3.937008 in Width (B) 25 mm 0.984252 in	112 kN	100 kN	7500 rpm	13000 rpm	1 kg1000 g
SKFNU 309 ECML/CNMSingle row cylindrical roller bearing, NU design	Recorded bore (d) 45 mm 1.771654 in Recorded outside dimension (D) 100 mm 3.937008 in Catalogue width (symbol unverified) 25 mm 0.984252 in	112 kN	100 kN	7500 rpm	13000 rpm	0.987 kg987 g
SKFNU 309 ECPSingle row cylindrical roller bearing, NU design	Bore diameter (d) 45 mm 1.771654 in Outside diameter (D) 100 mm 3.937008 in Width (B) 25 mm 0.984252 in	112 kN	100 kN	7500 rpm	8500 rpm	0.895 kg895 g
SKFNU 309 ECP/C3Single row cylindrical roller bearing, NU design	Recorded bore (d) 45 mm 1.771654 in Recorded outside dimension (D) 100 mm 3.937008 in Catalogue width (symbol unverified) 25 mm 0.984252 in	112 kN	100 kN	7500 rpm	8500 rpm	0.895 kg895 g
SKFNU 309 ECP/CNMSingle row cylindrical roller bearing, NU design	Recorded bore (d) 45 mm 1.771654 in Recorded outside dimension (D) 100 mm 3.937008 in Catalogue width (symbol unverified) 25 mm 0.984252 in	112 kN	100 kN	7500 rpm	8500 rpm	0.87 kg870 g
SKFNU 309 ECPHSingle row cylindrical roller bearing, NU design	Bore diameter (d) 45 mm 1.771654 in Outside diameter (D) 100 mm 3.937008 in Width (B) 25 mm 0.984252 in	112 kN	100 kN	7500 rpm	8500 rpm	0.895 kg895 g
FAGNU309-E-XL-M1Cylindrical roller bearing	Bore diameter (d) 45 mm 1.771654 in Outside diameter (D) 100 mm 3.937008 in Width (B) 25 mm 0.984252 in	116 kN	99 kN	6400 rpm	12800 rpm	0.98 kg980 g
FAGNU309-E-XL-TVP2Cylindrical roller bearing	Bore diameter (d) 45 mm 1.771654 in Outside diameter (D) 100 mm 3.937008 in Width (B) 25 mm 0.984252 in	116 kN	99 kN	6400 rpm	9800 rpm	0.88 kg880 g
FAGNU309-E-XL-TVP2>ACylindrical roller bearing	Bore diameter (d) 45 mm 1.771654 in Outside diameter (D) 100 mm 3.937008 in Width (B) 25 mm 0.984252 in	116 kN	99 kN	6400 rpm	9800 rpm	0.88 kg880 g
FAGNU309-E-XL-TVP2-C3Cylindrical roller bearing	Bore diameter (d) 45 mm 1.771654 in Outside diameter (D) 100 mm 3.937008 in Width (B) 25 mm 0.984252 in	116 kN	99 kN	6400 rpm	9800 rpm	0.88 kg880 g
FAGNU309-E-XL-TVP2-C3>ACylindrical roller bearing	Bore diameter (d) 45 mm 1.771654 in Outside diameter (D) 100 mm 3.937008 in Width (B) 25 mm 0.984252 in	116 kN	99 kN	6400 rpm	9800 rpm	0.88 kg880 g
FAGNU309-E-XL-TVP2-C4Cylindrical roller bearing	Bore diameter (d) 45 mm 1.771654 in Outside diameter (D) 100 mm 3.937008 in Width (B) 25 mm 0.984252 in	116 kN	99 kN	6400 rpm	9800 rpm	0.88 kg880 g
NSKNU309EWCylindrical roller bearing	Bore diameter (d) 45 mm 1.771654 in Outside diameter (D) 100 mm 3.937008 in Bearing width (B) 25 mm 0.984252 in	120 kN	98.5 kN	—	—	—
KOYONU309RCylindrical roller bearing	Bore diameter (d) 45 mm 1.771654 in Outside diameter (D) 100 mm 3.937008 in Width (B) 25 mm 0.984252 in	122 kN	98.3 kN	—	6100 rpmLimiting Speeds(Grease Lub.): 6100 min-1Limiting Speeds(Oil Lub.): 8200 min-1	0.909 kg909 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 NU309	Not recorded	Not recorded	CN	pressed steel cage	Not recorded	Not recorded
SKF NU 309 ECJ	Without	Not recorded	CN	Sheet metal	Not recorded	None
SKF NU 309 ECJ/C3	Without	Not recorded	C3	Sheet metal	Not recorded	None
SKF NU 309 ECM	Without	Not recorded	CN	Machined brass	Not recorded	None
SKF NU 309 ECM/C3	Without	Not recorded	C3	Machined brass	Not recorded	None
SKF NU 309 ECML	Without	Not recorded	CN	Machined brass	Not recorded	None
SKF NU 309 ECML/CNM	Without	Not recorded	CNM	Machined brass	Not recorded	None
SKF NU 309 ECP	Without	Not recorded	CN	Non-metallic	Not recorded	None
SKF NU 309 ECP/C3	Without	Not recorded	C3	Non-metallic	Not recorded	None
SKF NU 309 ECP/CNM	Without	Not recorded	CNM	Non-metallic	Not recorded	None
SKF NU 309 ECPH	Without	Not recorded	CN	Non-metallic	Not recorded	None
FAG NU309-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 NU309-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 NU309-E-XL-TVP2>A	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 NU309-E-XL-TVP2-C3	Not recorded	PN — Normal (ISO 492:2023)	C3 (Group 3) — Internal clearance larger than CN	TVP2 — Solid Window Cage made from PA66	Not recorded	Not recorded
FAG NU309-E-XL-TVP2-C3>A	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
FAG NU309-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
NSK NU309EW	Not recorded	Not recorded	Not recorded	Pressed steel	Not recorded	Not recorded
KOYO NU309R	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.

NTN

NU309

Cylindrical roller bearing

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