51103NSKThrust

Name: NSK 51103 Thrust Bearing
Brand: NSK
SKU: 51103

51103 is a NSK thrust bearing, bore 17 mm, O.D. 30 mm, height 9 mm, dynamic rating 2,570 lbs. Dimensions, drawing, interchanges and price.

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Bore d17mm

Outside dia. D30mm

Overall width T9mm

Dynamic Cr2,570lbs

Static C0r4,380lbs

Limiting speed6,000rpm

Weight0.025kg

Cr / C0r0.59

Mean dia. dm23.5mm

Original catalogue drawing - NSK catalogue, page 143

51103 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	17	0.6693
D	Outside diameter	30	1.1811
T	Overall assembly width	9	0.3543

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)	17
Bore d (in)	0.6693
Outside dia. D (mm)	30
Outside dia. D (in)	1.1811
Overall width T (mm)	9
Overall width T (in)	0.3543

Load ratings & speeds

Basic dynamic axial rating Ca (lbs)	2570
Basic static axial rating Coa (lbs)	4380
Limiting speed - grease (rpm)	6,000
Limiting speed - oil (rpm)	9,000

Weight

Weight (kg)	0.025

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.012
Shaft shoulder da min (in)	0.985
Housing shoulder Da (in)	0.867

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 2,000 rpm
4	2,858	102	847
6	1,905	392	3,271
8	1,429	1,024	8,533
10	1,143	2,154	17,954
15	762	8,323	69,362

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 11,432 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
51203	NSK	Thrust	17	35	12	3,880 lbs	0.05
51102	NSK	Thrust	15	28	9	2,380 lbs	0.23
51202	NSK	Thrust	15	32	12	3,770 lbs	0.043
52202	NSK	Thrust	15	32	None	16.7 kN	0.09
51104	NSK	Thrust	20	35	10	3,390 lbs	0.037
51204	NSK	Thrust	20	40	14	5,040 lbs	0.077
52204	NSK	Thrust	20	40	None	22.5 kN	0.151
51101	NSK	Thrust	12	26	9	2,330 lbs	0.021

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