HR30311NSKTapered Roller

Name: NSK HR30311 Tapered Roller Bearing
Brand: NSK
SKU: HR30311

HR30311 is a NSK tapered roller bearing, bore 55 mm, O.D. 120 mm, width 29 mm, dynamic rating 184 kN. Dimensions, drawing, interchanges and price.

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Bore d55mm

Outside dia. D120mm

Width B29mm

Dynamic Cr184kN

Static C0r171kN

Limiting speed3,200rpm

Weight1.63kg

Cr / C0r1.08

Mean dia. dm87.5mm

Original catalogue drawing - NSK E1103, page 264

HR30311 NSK Tapered Roller bearing catalogue drawing

Scanned from the manufacturer catalogue page listing this part number. All part numbers printed on that table share the same drawing.

Scale cross-section

Blue = inner / outer ring, yellow = rolling element. Drawn to scale from this part's own dimensions for selection reference only - not a manufacturing or assembly drawing.

Dimension table (mm / inch)

Symbol	Dimension	mm	inch
d	Bore diameter	55	2.1654
D	Outside diameter	120	4.7244
B	Inner-ring / bearing width	29	1.1417
T	Overall assembly width	31.5	1.2402
C	Cup / outer-ring width	25	0.9843
r	Chamfer (min)	2	0.0787

Notes

Weights are given in kg. Load ratings are shown in both the original catalogue units and the converted value (1 N = 0.2248 lbf). Data is provided for selection reference only - confirm against the latest official catalogue before ordering.

Main dimensions

Bore d (mm)	55
Outside dia. D (mm)	120
Width B (mm)	29
Overall width T (mm)	31.5
Cup width C (mm)	25

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	41365
Basic static load rating Cor (lbs)	38442
Basic dynamic load rating Cr (N)	184000
Basic static load rating C0r (N)	171000
Limiting speed - grease (rpm)	3,200
Effective load centre a (mm)	2.5

Weight

Weight (kg)	1.63

Mounting dimensions (fillets / shoulders)

Housing fillet r max (mm)	2

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,000 rpm
4	46,000	102	1,693
6	30,667	392	6,542
8	23,000	1,024	17,067
10	18,400	2,154	35,907
15	12,267	8,323	138,724

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 184,000 N. Hours = L₁₀ x 10⁶ / (60n). Life-modification factors for lubrication, contamination and temperature (a_ISO) are not included.

Source & traceability

Brand	NSK
Source catalogue	NSK CAT. No. E1103 (metric)
Catalogue page	p.264 (dimensions)

Load ratings in newtons, weights in kg, limiting speeds for grease and oil lubrication.

Interchange - same dimensions, other brands

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1311-K-TVH-C3	FAG	Ball	55	120	29	52 kN	1.55
1311-TVH	FAG	Ball	55	120	29	52 kN	1.57
6311	FAG	Ball	55	120	29	76.5 kN	1.39
6311-2RSR	FAG	Ball	55	120	29	76.5 kN	1.43
6311-2Z	FAG	Ball	55	120	29	76.5 kN	1.43
6311-C	FAG	Ball	55	120	29	83 kN	1.33
6311-C-2BRS	FAG	Ball	55	120	29	83 kN	1.38
6311-C-2HRS	FAG	Ball	55	120	29	83 kN	1.37
6311-C-2Z	FAG	Ball	55	120	29	83 kN	1.37
QJ311-MPA	FAG	Ball	55	120	29	127 kN	1.76

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1311	NSK	Ball	55	120	29	11,500 lbs	1.642
6311	NSK	Ball	55	120	29	16,100 lbs	1.352
7311B	NSK	Ball	55	120	29	16,800 lbs	1.52
BL311	NSK	Ball	55	120	29	19,900 lbs	1.465
311	NSK	Cylindrical Roller	55	120	29	24,900 lbs	1.451
NU311E	NSK	Cylindrical Roller	55	120	29	169 kN	1.64
21311EAE4	NSK	Spherical Roller	55	120	29	178 kN	1.58
HR30311J	NSK	Tapered Roller	55	120	29	33,700 lbs	1.628

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
HR30211	NSK	Tapered Roller	55	100	21	116 kN	0.736
HR30211J	NSK	Tapered Roller	55	100	21	21,200 lbs	0.735
HR30311J	NSK	Tapered Roller	55	120	29	33,700 lbs	1.628
HR31311	NSK	Tapered Roller	55	120	29	161 kN	1.58
HR31311J	NSK	Tapered Roller	55	120	29	29,400 lbs	1.579
HR32011	NSK	Tapered Roller	55	90	23	100 kN	0.568
HR32011XJ	NSK	Tapered Roller	55	90	23	81,500 lbs	0.567
HR32211J	NSK	Tapered Roller	55	100	25	24,700 lbs	0.862

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