SIFT BEARING STORE CATALOG

7903A5NSKPrecision / Angular Contact

7903A5 is a NSK precision / angular contact bearing, bore 17 mm, O.D. 30 mm, width 7 mm. Dimensions, drawing, interchanges and price.

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Bore d17mm
Outside dia. D30mm
Width B7mm
Dynamic Cr1,070lbs
Static C0r630lbs
Limiting speed42,600rpm
Weight0.018kg
Cr / C0r1.7
Mean dia. dm23.5mm

Original catalogue drawing - NSK catalogue, page 201

7903A5 NSK Precision / Angular Contact 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

DdBOutside dia. D30 mmBore d17 mmWidth B7 mm

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)

SymbolDimensionmminch
dBore diameter170.6693
DOutside diameter301.1811
BInner-ring / bearing width70.2756

Notes

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
Width B (mm)7
Width B (in)0.2756

Load ratings & speeds

Basic dynamic load rating Cr (lbs)1070
Basic static load rating Cor (lbs)630
Limiting speed - grease (rpm)42,600
Limiting speed - oil (rpm)63,900

Weight

Weight (kg)0.018

Mounting dimensions (fillets / shoulders)

Fillet ra (in)0.012
Fillet rb (in)0.006
Shaft shoulder da (in)0.768
Housing shoulder Da (in)1.083
Housing shoulder Db (in)1.134

Bearing life (ISO 281 basic rating life)

C / PEquivalent load P (N)L10 (106 rev)L10h at 3,000 rpm
41,19064356
67932161,200
85955122,844
104761,0005,556
153173,37518,750

Basic rating life per ISO 281: L10 = (C/P)3 with C = 4,760 N. Hours = L10 x 106 / (60n). Life-modification factors for lubrication, contamination and temperature (aISO) are not included.

Source & traceability

BrandNSK
Source catalogueNSK inch product catalogue
Catalogue pagep.203 (dimensions) / p.204 (ratings)

Dimensions in inches and millimetres, load ratings in lbs.

Interchange - same dimensions, other brands

DesignationBrandTypedDB/TDyn. ratingkg
61903FAGBall173074.9 kN0.014
61903-2RSRFAGBall173074.9 kN0.02
61903-2ZFAGBall173074.9 kN0.017
B71903-C-T-P4SFAGPrecision / Angular Contact173075.3 kN0.017
B71903-E-T-P4SFAGPrecision / Angular Contact173075 kN0.017
HCB71903-C-T-P4SFAGPrecision / Angular Contact173073.6 kN0.02
HCB71903-E-T-P4SFAGPrecision / Angular Contact173073.5 kN0.02
HCS71903-C-T-P4SFAGPrecision / Angular Contact173072 kN0.017
HCS71903-E-T-P4SFAGPrecision / Angular Contact173071.9 kN0.017
HSS71903-C-T-P4SFAGPrecision / Angular Contact173072.9 kN0.017

Same dimensions, same brand

DesignationBrandTypedDB/TDyn. ratingkg
6903NSKBall173071,030 lbs0.018
7903CNSKPrecision / Angular Contact173071,120 lbs0.018

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
17BGR10HNSKPrecision / Angular Contact1735101,010 lbs0.036
17BGR10SNSKPrecision / Angular Contact1735101,010 lbs0.036
17TAC47BNSKPrecision / Angular Contact174715--
5203NSKPrecision / Angular Contact174017.516.1 kN0.1
5203AZZNSKPrecision / Angular Contact174017.514 kN0.1
5303NSKPrecision / Angular Contact174722.223.1 kN0.18
5303AZZNSKPrecision / Angular Contact174722.221.6 kN0.18
7003NSKPrecision / Angular Contact1735107 kN0.04

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