51309NSKThrust

Name: NSK 51309 Thrust Bearing
Brand: NSK
SKU: 51309

51309 is a NSK thrust bearing, bore 45 mm, O.D. 85 mm, height 28 mm, dynamic rating 18,000 lbs. Dimensions, drawing, interchanges and price.

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Bore d45mm

Outside dia. D85mm

Overall width T28mm

Dynamic Cr18,000lbs

Static C0r36,800lbs

Limiting speed2,000rpm

Weight0.672kg

Cr / C0r0.49

Mean dia. dm65mm

Original catalogue drawing - NSK catalogue, page 143

51309 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	45	1.7717
D	Outside diameter	85	3.3465
T	Overall assembly width	28	1.1024

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)	45
Bore d (in)	1.7717
Outside dia. D (mm)	85
Outside dia. D (in)	3.3465
Overall width T (mm)	28
Overall width T (in)	1.1024

Load ratings & speeds

Basic dynamic axial rating Ca (lbs)	18000
Basic static axial rating Coa (lbs)	36800
Limiting speed - grease (rpm)	2,000
Limiting speed - oil (rpm)	3,000

Weight

Weight (kg)	0.672

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.039
Shaft shoulder da min (in)	2.719
Housing shoulder Da (in)	2.403

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 600 rpm
4	20,017	102	2,822
6	13,345	392	10,903
8	10,008	1,024	28,444
10	8,007	2,154	59,845
15	5,338	8,323	231,207

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 80,068 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.

Interchange - same dimensions, other brands

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
WS22209-E1-XL-2RSR	FAG	Spherical Roller	45	85	28	104 kN	0.67

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
51109	NSK	Thrust	45	65	14	6,300 lbs	0.142
51209	NSK	Thrust	45	73	20	10,800 lbs	0.31
51409	NSK	Thrust	45	100	39	28,600 lbs	1.46
52209	NSK	Thrust	45	73	None	48 kN	0.652
52309	NSK	Thrust	45	85	None	80.5 kN	1.34
52409	NSK	Thrust	45	100	None	128 kN	2.85
51108	NSK	Thrust	40	60	13	6,100 lbs	0.12
51208	NSK	Thrust	40	68	19	10,600 lbs	0.27

Request a quotation for 51309

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.

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