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UNGROUND (non-precision) and SEMI-PRECISION


Unground Bearing Numbering System

Class/Type Bore X OD Seals
UG ~ Unground
UGF ~ Unground, Flanged OD
UGFH ~ Unground, Flanged, Hex Bore
UGFS ~ Unground, Flanged, Extended
Inner Race w/Set Screws
UGT ~ Unground, Thrust Bearing
SP ~ Semi-Precision
SR ~ Snap Ring		 Bore (Inches) X OD (Inches) 2RS—2 Rubber Seals
ZZ—Two metal Shields

USDI Ungroung Bearings & Semi-Precision Bearings —ROUND BORE—NON-FLANGED

USDI P/N Interchange Interchange Bore X OD Seals
SP.1875X.4375-2RS 3/16 X 7/16 2RS
UG.1875X.6875 SR-253 A1222 3/16 X 1/16
SP.250X.4375-2RS 1/4 X 7/16 2RS
UG.250X.6875 SR-254 A1622 1/4 X 11/16
UG.250X.750 SR-255 A1624 1/4 X 3/4
UG.250X1.00 SR-290 A1632 1/4 X 1
UG.3125X.875 SR-268 A2028 5/16 X 7/8
SP.3125X.875-2RS 5/16 X 7/8 2RS
SP.3125X.9062-2RS 5/16 X 29/32 2RS
UG.3125X1.0625 SR-312 A2034B 5/16 X 1-1/16
UG.375X.875 SR-269 A2428 3/8 X 7/8
SP.375X.875-2RS 3/8 X 7/8 2RS
UG.375X.9062 A2429 3/8 X 29/32
SP.375X.9062-2RS 3/8 X 29/32 2RS
UG.375X1.125 SR-333 A2436 3/8 X 1-1/8
SP.375X1.125-2RS 3/8 X 1-1/8 2RS
UG.4375X.9062 A2829 7/16 X 29/32
SP.4375X.9062-2RS 7/16 X 29/32 2RS
SP.4375X1.125-2RS 7/16 X 1-1/8 2RS
SP.4375X1.375-2RS 7/16 X 1-3/8 2RS
UG.500X1.125 SR-337 A3236 1/2 X 1-1/8
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