51311NSKThrust

Name: NSK 51311 Thrust Bearing
Brand: NSK
SKU: 51311

51311 is a NSK thrust bearing, bore 55 mm, O.D. 105 mm, height 35 mm, dynamic rating 26,000 lbs. Dimensions, drawing, interchanges and price.

Request a quote WhatsApp Email us Search the catalog

Bore d55mm

Outside dia. D105mm

Overall width T35mm

Dynamic Cr26,000lbs

Static C0r54,900lbs

Limiting speed1,600rpm

Weight1.311kg

Cr / C0r0.47

Mean dia. dm80mm

Original catalogue drawing - NSK catalogue, page 145

51311 NSK Thrust 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	105	4.1339
T	Overall assembly width	35	1.378

Notes

Thrust bearing ratings are axial values Ca / Coa; T is the overall height. 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)	105
Outside dia. D (in)	4.1339
Overall width T (mm)	35
Overall width T (in)	1.3780

Load ratings & speeds

Basic dynamic axial rating Ca (lbs)	26000
Basic static axial rating Coa (lbs)	54900
Limiting speed - grease (rpm)	1,600
Limiting speed - oil (rpm)	2,400

Weight

Weight (kg)	1.311

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.039
Shaft shoulder da min (in)	3.349
Housing shoulder Da (in)	2.955

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 500 rpm
4	28,913	102	3,386
6	19,276	392	13,083
8	14,457	1,024	34,133
10	11,565	2,154	71,814
15	7,710	8,323	277,449

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 115,654 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.147 (dimensions) / p.148 (ratings)

Dimensions in inches and millimetres, load ratings in lbs.

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
51111	NSK	Thrust	55	78	16	7,940 lbs	0.227
51211	NSK	Thrust	55	90	25	15,800 lbs	0.599
51411	NSK	Thrust	55	120	48	40,800 lbs	2.581
52311	NSK	Thrust	55	105	None	115 kN	2.7
52411	NSK	Thrust	55	120	None	181 kN	4.68
51110	NSK	Thrust	50	70	14	6,530 lbs	0.154
51210	NSK	Thrust	50	78	22	11,000 lbs	0.376
51310	NSK	Thrust	50	95	31	21,900 lbs	0.93

Request a quotation for 51311

Send us the quantity you need and we will come back with price and lead time, normally within 24 hours. Equivalent parts from other brands can be quoted at the same time.

Online enquiry form richard@bearingsfit.com WhatsApp +86 156 2149 6516