51209NSKThrust

Name: NSK 51209 Thrust Bearing
Brand: NSK
SKU: 51209

51209 is a NSK thrust bearing, bore 45 mm, O.D. 73 mm, height 20 mm, dynamic rating 10,800 lbs. Dimensions, drawing, interchanges and price.

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Bore d45mm

Outside dia. D73mm

Overall width T20mm

Dynamic Cr10,800lbs

Static C0r23,500lbs

Limiting speed2,600rpm

Weight0.31kg

Cr / C0r0.46

Mean dia. dm59mm

Original catalogue drawing - NSK catalogue, page 143

51209 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	73	2.874
T	Overall assembly width	20	0.7874

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)	73
Outside dia. D (in)	2.8740
Overall width T (mm)	20
Overall width T (in)	0.7874

Load ratings & speeds

Basic dynamic axial rating Ca (lbs)	10800
Basic static axial rating Coa (lbs)	23500
Limiting speed - grease (rpm)	2,600
Limiting speed - oil (rpm)	4,000

Weight

Weight (kg)	0.31

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.039
Shaft shoulder da min (in)	2.443
Housing shoulder Da (in)	2.206

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 800 rpm
4	12,010	102	2,117
6	8,007	392	8,177
8	6,005	1,024	21,333
10	4,804	2,154	44,884
15	3,203	8,323	173,406

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 48,041 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
51109	NSK	Thrust	45	65	14	6,300 lbs	0.142
51309	NSK	Thrust	45	85	28	18,000 lbs	0.672
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 51209

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