51318NSKThrust

Name: NSK 51318 Thrust Bearing
Brand: NSK
SKU: 51318

51318 is a NSK thrust bearing, bore 90 mm, O.D. 155 mm, height 50 mm, dynamic rating 48,300 lbs. Dimensions, drawing, interchanges and price.

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Bore d90mm

Outside dia. D155mm

Overall width T50mm

Dynamic Cr48,300lbs

Static C0r118,000lbs

Limiting speed1,100rpm

Weight3.828kg

Cr / C0r0.41

Mean dia. dm122.5mm

Original catalogue drawing - NSK catalogue, page 147

51318 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	90	3.5433
D	Outside diameter	155	6.1024
T	Overall assembly width	50	1.9685

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)	90
Bore d (in)	3.5433
Outside dia. D (mm)	155
Outside dia. D (in)	6.1024
Overall width T (mm)	50
Overall width T (in)	1.9685

Load ratings & speeds

Basic dynamic axial rating Ca (lbs)	48300
Basic static axial rating Coa (lbs)	118000
Limiting speed - grease (rpm)	1,100
Limiting speed - oil (rpm)	1,700

Weight

Weight (kg)	3.828

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.059
Shaft shoulder da min (in)	5.083
Housing shoulder Da (in)	4.570

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 300 rpm
4	53,712	102	5,644
6	35,808	392	21,805
8	26,856	1,024	56,889
10	21,485	2,154	119,691
15	14,323	8,323	462,415

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 214,849 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.149 (dimensions) / p.150 (ratings)

Dimensions in inches and millimetres, load ratings in lbs.

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
29318E	NSK	Thrust	90	150	39	78,500 lbs	2.835
29418E	NSK	Thrust	90	190	60	156,000 lbs	7.53
51118	NSK	Thrust	90	120	22	13,600 lbs	0.644
51218	NSK	Thrust	90	135	35	25,600 lbs	1.692
51418	NSK	Thrust	90	190	77	330 kN	10.3
51418X	NSK	Thrust	90	190	77	73,900 lbs	10.201
52318	NSK	Thrust	90	155	None	214 kN	7.33
52418	NSK	Thrust	90	190	None	330 kN	18.1

Request a quotation for 51318

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