SIFT BEARING STORE CATALOG

NN3921NSKPrecision / Angular Contact

NN3921 is a NSK precision / angular contact bearing, bore 105 mm, O.D. 145 mm, width 30 mm. Dimensions, drawing, interchanges and price.

Request a quoteEmail usSearch the catalog
Bore d105mm
Outside dia. D145mm
Width B30mm
Dynamic Cr24,700lbs
Static C0r43,600lbs
Limiting speed5,600rpm
Weight1.497kg
Cr / C0r0.57
Mean dia. dm125mm

Original catalogue drawing - NSK catalogue, page 223

NN3921 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. D145 mmBore d105 mmWidth B30 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 diameter1054.1339
DOutside diameter1455.7087
BInner-ring / bearing width301.1811

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)105
Bore d (in)4.1339
Outside dia. D (mm)145
Outside dia. D (in)5.7087
Width B (mm)30
Width B (in)1.1811

Load ratings & speeds

Basic dynamic load rating Cr (lbs)24700
Basic static load rating Cor (lbs)43600
Limiting speed - grease (rpm)5,600
Limiting speed - oil (rpm)6,300

Weight

Weight (kg)1.497

Mounting dimensions (fillets / shoulders)

Fillet ra (in)0.0394
Shaft shoulder da min (in)5.4528
Shaft shoulder da (in)4.3898
Housing shoulder Db (in)5.3543

Bearing life (ISO 281 basic rating life)

C / PEquivalent load P (N)L10 (106 rev)L10h at 1,800 rpm
427,46864593
618,3122162,000
813,7345124,741
1010,9871,0009,259
157,3253,37531,250

Basic rating life per ISO 281: L10 = (C/P)3 with C = 109,871 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.225 (dimensions) / p.226 (ratings)

Dimensions in inches and millimetres, load ratings in lbs.

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
105BAR10SNSKPrecision / Angular Contact10516024.7511,128 lbs1.737
105BNC10NSKPrecision / Angular Contact1051602612,590 lbs1.728
105BNC10SN24NSKPrecision / Angular Contact1051602612,590 lbs1.728
105BTR10SNSKPrecision / Angular Contact10516024.7513,151 lbs1.742
7021NSKPrecision / Angular Contact1051602688 kN1.84
7021A5NSKPrecision / Angular Contact1051602618,700 lbs1.819
7021CNSKPrecision / Angular Contact1051602619,800 lbs1.801
7221NSKPrecision / Angular Contact10519036172 kN3.84

Request a quotation for NN3921

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.