CMI High-Strength Stainless Steel Crank Pulley Bolt & Washer Kit
Upgrade your engine's reliability with the CMI Stainless Steel Crank Pulley Bolt & Washer Kit. Engineered for high-performance applications, this kit replaces standard hardware with aerospace-grade materials and precision machining to ensure your harmonic balancer remains secure under the most demanding conditions.
Superior Metallurgy & Strength
The core of this kit is the 17-4 Stainless Steel bolt, heat-treated to an H-900 condition. This results in a Rockwell hardness of 40-44 RC, providing an exceptional balance of high tensile strength and corrosion resistance that far exceeds standard Grade 8 steel.
Precision Engineering
-
'J' Profile Threads: Features precision-cut 'J' threads with a controlled root radius. This specialized geometry reduces stress concentrations at the thread base, effectively preventing the fatigue cracking common in inferior fasteners.
-
Dual-Drive Versatility: The innovative head design offers two ways to torque: use a standard 1/2" drive ratchet internally or a 1" external hex wrench/socket.
-
Self-Centering Washer: The heavy-duty washer (6.35mm thick) is designed with a custom machined step. This ensures the crank pulley is perfectly centered every time, eliminating radial runout and vibration.
Technical Specifications
| Feature | Specification |
| Material | 17-4 Stainless Steel (H-900) |
| Hardness | 40-44 Rockwell C (RC) |
| Washer Dimensions | 42.6mm OD x 6.35mm Thickness |
| Drive Types | 1/2" Square Drive & 1" External Hex |
| Thread Type | Precision-cut 'J' Thread |