Bearing Enduro Bearings ACB 3645 3544 Stainless Steel 1-1/8″

ACB 3645 3544 SS – 1-1/8″ angular-contact headset bearing with 440C stainless steel balls and races. Dimensions: 35 × 44 × 6 mm; angles: 36 × 45°.

This bearing size is also known in the bicycle industry by the codes ACB3344H6 and AC3344.

Enduro uses only 440C stainless steel balls and races, providing long service life and corrosion resistance. Among standard 440-series stainless steel alloys, 440C has the highest strength, hardness, and wear resistance, supported by its high carbon content. It is the most expensive alloy in the 440 series and requires special heat and cryogenic treatment. Although it is slightly softer than the standard 52100 chromium steel used in most Enduro bearings, stainless steel is suitable for wet conditions and environments where bearings may be exposed to sweat or spilled sports drinks. LLB-type seals and Almagard 3752 grease provide additional protection against water. Enduro 440C stainless steel headset bearings are used in products from many popular headset brands and come with a lifetime warranty.

The Enduro angular-contact headset bearing range includes races made from black-oxide-treated chromium steel, as well as models made from full 440C stainless steel. The bearings are engineered with the largest balls possible, have dual-lip seals running in a micro-groove (labyrinth), and are filled to 90% with high-pressure, waterproof grease. Angular Contact (A/C) bearings are designed to engage all balls evenly, spreading force over a larger surface area and reducing wear.

• Static load: 935 lbf / 4.15 kN
• Weight: 20 g