LLU/LLB Dual Seal Technology

Our newest addition to our ABEC-5 line is the new LLU//LLB dual seal bearings. The ABEC-5 Dual Seal bearing places a LLU full contact seal on the outside facing surface of the bearing, while the Inboard facing LLB medium contact seal offers less drag. These specific seal increase the lifespan of the bearing  and offer excellent performance.

Grade 5 Chromium Steel Balls

High precision balls are within 5/1,000,000″ round. These are military level specification, used for precision equipment. R-64 hardness, of the highest grade.

52100 High Carbon Chromium Alloy Races

Vacuum de-gassing process for the purest chromium alloy steel, hardened to R-62, extremely tough and very durable. Polished to a mirror finish for ABEC-5 precision and noiseless movement.

Graphite/Nylon Ball Retainers

Nylon with graphite retainers are virtually frictionless while providing constant lubrication.

The ABEC 5 Standard

To meet the ABEC-5 standard, bearing design must pass all tests, which include noise testing at high RPM, extremely close tolerances for I.D. and O.D., roundness of ball, trueness of the races and micro surface finishes of balls and races.

C-3 Clearance

This specification describes the internal clearance between the bearing and its race. For example, in a 10-18 I.D. bearing, our standard is 11-21 micrometers where as others use 11-25 micrometers.

All across the board, our bearings have higher standards of tolerance to ensure superior performance.

C-N Clearance

We also offer our new Dual Seal Abec-5 bearings with CN Internal clearences for manufacturers that use tighter tolerences within the given component. In a 10-18 I.D. bearing, our internal clearance standard is 3-12 micrometers.

All across the board, our bearings have higher standards of tolerance to ensure superior performance.

Enduro Bearings manufactures some series of bearings using 440C stainless steel balls and races. This material provides maximum corrosion resistance in applications and environments where critical. Depending on the application, they are designed to ABEC-3 or ABEC-5 tolerances. Stainless steel has 20% less load capacity than the 52100 chromium steel, used in most of our bearings, but with far superior corrosion resistance.

When the rain won’t go away, and your bicycle is more often used as a boat rather than a land craft, you may want to consider 440C stainless steel bearings. While a little softer than chromium bearing steel, 440C stainless steel is a good alternative in constant wet conditions, or where sweat becomes a problem such as headset bearings. Enduro Bearings uses LLB type seals and CRC Marine Grease in these bearings to additionally water proof against the elements.