51420XNSKThrust

Name: NSK 51420X Thrust Bearing
Brand: NSK
SKU: 51420X

51420X is a NSK thrust bearing, bore 100 mm, O.D. 210 mm, height 85 mm, dynamic rating 83,800 lbs. Dimensions, drawing, interchanges and price.

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Bore d100mm

Outside dia. D210mm

Overall width T85mm

Dynamic Cr83,800lbs

Static C0r220,000lbs

Limiting speed7,100rpm

Weight14.801kg

Cr / C0r0.38

Mean dia. dm155mm

Original catalogue drawing - NSK catalogue, page 147

51420X 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	100	3.937
D	Outside diameter	210	8.2677
T	Overall assembly width	85	3.3465

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)	100
Bore d (in)	3.9370
Outside dia. D (mm)	210
Outside dia. D (in)	8.2677
Overall width T (mm)	85
Overall width T (in)	3.3465

Load ratings & speeds

Basic dynamic axial rating Ca (lbs)	83800
Basic static axial rating Coa (lbs)	220000
Limiting speed - grease (rpm)	7,100
Limiting speed - oil (rpm)	1,100

Weight

Weight (kg)	14.801

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.099
Shaft shoulder da min (in)	6.501
Housing shoulder Da (in)	5.713

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 2,300 rpm
4	93,190	102	736
6	62,127	392	2,844
8	46,595	1,024	7,420
10	37,276	2,154	15,612
15	24,851	8,323	60,315

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 372,761 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
29320	NSK	Thrust	100	170	42	410 kN	3.6
29320E	NSK	Thrust	100	170	42	92,000 lbs	3.606
29420	NSK	Thrust	100	210	67	840 kN	10.3
29420E	NSK	Thrust	100	210	67	189,000 lbs	10.297
51120	NSK	Thrust	100	135	25	19,300 lbs	0.962
51220	NSK	Thrust	100	150	38	30,200 lbs	2.25
51320	NSK	Thrust	100	170	55	53,600 lbs	4.98
52220	NSK	Thrust	100	150	None	135 kN	4.54

Request a quotation for 51420X

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