The Crewson MK21153S is a standard automatic slack adjuster specified as 1.5 x 10 spline, model AL5-6, with a clevis thread of 5/8-18 STD. Sourced under OEM part number MK21153S, this unit also cross-references as 05-550, E10950B, EUE-10950B, and STMMK21153S, among others, making it a widely interchangeable air brake slack adjuster for heavy-duty truck and trailer applications. The spline specification (1.5-inch diameter, 10-spline) and clevis threading are the key fitment dimensions to match against your camshaft and clevis bracket before ordering. Available from Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
Automatic slack adjuster, model AL5-6
1.5-inch diameter, 10-spline camshaft interface
Clevis thread: 5/8-18 STD
OEM part number: MK21153S
Cross-references include 05-550, E10950B, EUE-10950B, STMMK21153S, and TWDMK21153S
Sold individually (unit of measure: each)
Tech Specs
- Spline Diameter: 1.5 in.
- Spline Count: 10
- Model: AL5-6
- Clevis Thread: 5/8-18 STD
- Part Number: MK21153S
- Cross References: 05-550, 05550, 40010302M1D, E10950A, E10950B, EUE-10950B, STMMK21153S, TWDMK21153S, 7843-MK21153S
