51111NSKThrust

Name: NSK 51111 Thrust Bearing
Brand: NSK
SKU: 51111

51111 is a NSK thrust bearing, bore 55 mm, O.D. 78 mm, height 16 mm, dynamic rating 7,940 lbs. Dimensions, drawing, interchanges and price.

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Bore d55mm

Outside dia. D78mm

Overall width T16mm

Dynamic Cr7,940lbs

Static C0r20,900lbs

Limiting speed2,800rpm

Weight0.227kg

Cr / C0r0.38

Mean dia. dm66.5mm

Original catalogue drawing - NSK catalogue, page 145

51111 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	55	2.1654
D	Outside diameter	78	3.0709
T	Overall assembly width	16	0.6299

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)	55
Bore d (in)	2.1654
Outside dia. D (mm)	78
Outside dia. D (in)	3.0709
Overall width T (mm)	16
Overall width T (in)	0.6299

Load ratings & speeds

Basic dynamic axial rating Ca (lbs)	7940
Basic static axial rating Coa (lbs)	20900
Limiting speed - grease (rpm)	2,800
Limiting speed - oil (rpm)	4,300

Weight

Weight (kg)	0.227

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.024
Shaft shoulder da min (in)	2.719
Housing shoulder Da (in)	2.522

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 900 rpm
4	8,830	102	1,881
6	5,886	392	7,268
8	4,415	1,024	18,963
10	3,532	2,154	39,897
15	2,355	8,323	154,138

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 35,319 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.147 (dimensions) / p.148 (ratings)

Dimensions in inches and millimetres, load ratings in lbs.

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
51211	NSK	Thrust	55	90	25	15,800 lbs	0.599
51311	NSK	Thrust	55	105	35	26,000 lbs	1.311
51411	NSK	Thrust	55	120	48	40,800 lbs	2.581
52311	NSK	Thrust	55	105	None	115 kN	2.7
52411	NSK	Thrust	55	120	None	181 kN	4.68
51110	NSK	Thrust	50	70	14	6,530 lbs	0.154
51210	NSK	Thrust	50	78	22	11,000 lbs	0.376
51310	NSK	Thrust	50	95	31	21,900 lbs	0.93

Request a quotation for 51111

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