SIFT BEARING STORE CATALOG

7938CNSKPrecision / Angular Contact

7938C is a NSK precision / angular contact bearing, bore 190 mm, O.D. 260 mm, width 33 mm. Dimensions, drawing, interchanges and price.

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Bore d190mm
Outside dia. D260mm
Width B33mm
Dynamic Cr33,100lbs
Static C0r43,200lbs
Limiting speed5,200rpm
Weight5.062kg
Cr / C0r0.77
Mean dia. dm225mm

Original catalogue drawing - NSK catalogue, page 199

7938C 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. D260 mmBore d190 mmWidth B33 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 diameter1907.4803
DOutside diameter26010.2362
BInner-ring / bearing width331.2992

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)190
Bore d (in)7.4803
Outside dia. D (mm)260
Outside dia. D (in)10.2362
Width B (mm)33
Width B (in)1.2992

Load ratings & speeds

Basic dynamic load rating Cr (lbs)33100
Basic static load rating Cor (lbs)43200
Limiting speed - grease (rpm)5,200
Limiting speed - oil (rpm)7,800

Weight

Weight (kg)5.062

Mounting dimensions (fillets / shoulders)

Fillet ra (in)0.079
Fillet rb (in)0.039
Shaft shoulder da (in)7.874
Housing shoulder Da (in)9.843
Housing shoulder Db (in)10.000

Bearing life (ISO 281 basic rating life)

C / PEquivalent load P (N)L10 (106 rev)L10h at 1,700 rpm
436,80964627
624,5392162,118
818,4055125,020
1014,7241,0009,804
159,8163,37533,088

Basic rating life per ISO 281: L10 = (C/P)3 with C = 147,236 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.201 (dimensions) / p.202 (ratings)

Dimensions in inches and millimetres, load ratings in lbs.

Interchange - same dimensions, other brands

DesignationBrandTypedDB/TDyn. ratingkg
61938FAGBall19026033140 kN4.39
B71938-C-T-P4SFAGPrecision / Angular Contact19026033166 kN4.31
B71938-E-T-P4SFAGPrecision / Angular Contact19026033156 kN4.29

Same dimensions, same brand

DesignationBrandTypedDB/TDyn. ratingkg
6938NSKBall1902603325,300 lbs5.13
7938A5NSKPrecision / Angular Contact1902603331,100 lbs5.121

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
7038A5NSKPrecision / Angular Contact1902904645,000 lbs11.204
7038CNSKPrecision / Angular Contact1902904655,300 lbs11.104
7238NSKPrecision / Angular Contact19034055345 kN22.4
7238A5NSKPrecision / Angular Contact1903405573,900 lbs22.303
7238CNSKPrecision / Angular Contact1903405577,200 lbs22.104
7338NSKPrecision / Angular Contact19040078495 kN47.5
7938A5NSKPrecision / Angular Contact1902603331,100 lbs5.121
NN3038NSKPrecision / Angular Contact19029075133,000 lbs17.663

Request a quotation for 7938C

Send us the quantity you need and we will come back with price and lead time, normally within 24 hours. Equivalent parts from other brands can be quoted at the same time.