A doublelip-seal is a combination of outside lip-seal and inside lip-seal. Outside lip-seal prevents foreign particles from entering the bush. Inside lip-seal prevents grease from leaking out of the bush.
By the doublelip-seal, the seal resistance shall be increased by some margin.

Grease-leak Comparison Test

Reference Data
test conditions: horizontal axis, applied load (no load),
　　　　　　　　maximum speed (60m/min), stroke (300mm)

Part Number Structure

Applicable Part Number

SM(S)6～30

TRF6～30

※ZZ option is available for standard type, long type, double-wide type, flange type, etc.　
　Please refer to NB general catalog for details.