3878A/3821 tapered roller bearing cad drawing
  1. The assembly part number lists the cone part number first and then the cup part number.

3878A_3821 Inch Series Tapered Roller Bearing

Model: 3878A/3821

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Product Details

Specifications
Bearing Type single row assembly
Bore Dia (d) 1.4375 in
Outer Dia (D) 3.3750 in
Width (B) 1.1875 in
Outer Width (Bo) 0.9375 in
Inner Width (Bi) 1.1875 in
Radius (min) (rs) 0.138 in
Radius (min) (rs1) 0.051 in
Weight (g) 1,029.00 grams
Material 52100 chrome steel or equiavelent