BL311NSKBall

Name: NSK BL311 Ball Bearing
Brand: NSK
SKU: BL311

BL311 is a NSK ball bearing, bore 55 mm, O.D. 120 mm, width 29 mm, dynamic rating 19,900 lbs. Dimensions, drawing, interchanges and price.

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Bore d55mm

Outside dia. D120mm

Width B29mm

Dynamic Cr19,900lbs

Static C0r13,800lbs

Limiting speed5,600rpm

Weight1.465kg

Cr / C0r1.44

Mean dia. dm87.5mm

Original catalogue drawing - NSK catalogue, page 43

BL311 NSK Ball 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
r	Chamfer (min)	2.007	0.079

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
Bore d (in)	2.1654
Outside dia. D (mm)	120
Outside dia. D (in)	4.7244
Width B (mm)	29
Width B (in)	1.1417

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	19900
Basic static load rating Cor (lbs)	13800
Limiting speed - grease (rpm)	5,600
Limiting speed - oil (rpm)	6,700

Weight

Weight (kg)	1.465

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.079
Shaft shoulder da min (in)	2.522
Shaft shoulder da max (in)	2.857
Housing shoulder Da max (in)	4.373

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,800 rpm
4	22,130	64	593
6	14,753	216	2,000
8	11,065	512	4,741
10	8,852	1,000	9,259
15	5,901	3,375	31,250

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 88,520 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 inch product catalogue
Catalogue page	p.45 (dimensions) / p.46 (ratings)

Dimensions in inches and millimetres, load ratings in lbs.

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
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
HR30311	NSK	Tapered Roller	55	120	29	184 kN	1.63
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
1211	NSK	Ball	55	100	21	6,070 lbs	0.694
1311	NSK	Ball	55	120	29	11,500 lbs	1.642
16011	NSK	Ball	55	90	11	21.4 kN	0.257
2211	NSK	Ball	55	100	25	5,960 lbs	0.83
2311	NSK	Ball	55	120	43	16,900 lbs	2.291
3211J	NSK	Ball	55	100	33.3	13,200 lbs	1.048
3311J	NSK	Ball	55	120	49.2	22,000 lbs	2.545
5211J	NSK	Ball	55	100	33.3	12,600 lbs	0.962

Request a quotation for BL311

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