51308NSKThrust

Name: NSK 51308 Thrust Bearing
Brand: NSK
SKU: 51308

51308 is a NSK thrust bearing, bore 40 mm, O.D. 78 mm, height 26 mm, dynamic rating 15,600 lbs. Dimensions, drawing, interchanges and price.

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Bore d40mm

Outside dia. D78mm

Overall width T26mm

Dynamic Cr15,600lbs

Static C0r30,200lbs

Limiting speed2,200rpm

Weight0.536kg

Cr / C0r0.52

Mean dia. dm59mm

Original catalogue drawing - NSK catalogue, page 143

51308 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	40	1.5748
D	Outside diameter	78	3.0709
T	Overall assembly width	26	1.0236

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)	40
Bore d (in)	1.5748
Outside dia. D (mm)	78
Outside dia. D (in)	3.0709
Overall width T (mm)	26
Overall width T (in)	1.0236

Load ratings & speeds

Basic dynamic axial rating Ca (lbs)	15600
Basic static axial rating Coa (lbs)	30200
Limiting speed - grease (rpm)	2,200
Limiting speed - oil (rpm)	3,400

Weight

Weight (kg)	0.536

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.039
Shaft shoulder da min (in)	2.482
Housing shoulder Da (in)	2.167

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 700 rpm
4	17,348	102	2,419
6	11,565	392	9,345
8	8,674	1,024	24,381
10	6,939	2,154	51,296
15	4,626	8,323	198,178

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 69,392 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.145 (dimensions) / p.146 (ratings)

Dimensions in inches and millimetres, load ratings in lbs.

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
51108	NSK	Thrust	40	60	13	6,100 lbs	0.12
51208	NSK	Thrust	40	68	19	10,600 lbs	0.27
51408	NSK	Thrust	40	90	36	23,100 lbs	1.1
52308	NSK	Thrust	40	78	None	70 kN	1.13
52408	NSK	Thrust	40	90	None	103 kN	2.02
51107	NSK	Thrust	35	52	12	4,960 lbs	0.081
51207	NSK	Thrust	35	62	18	8,920 lbs	0.21
51307	NSK	Thrust	35	68	24	12,500 lbs	0.386

Request a quotation for 51308

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