S&S Head Bolt Kit for 2017-2026 Harley M8

Product Description

S&S Cycle Head Bolt Kit for 2017-Up M8 Models

Upgrade head bolt kit for 2017-current Harley-Davidson Milwaukee-Eight engines. Premium 8640 steel construction with 200,000 psi ultimate tensile strength—14% stronger than stock head bolts. Durable black oxide coating resists corrosion. 9/16" 12-point head with integral washer and formed threads. Cold-forged for precision fit and reliability. Reusable for maintenance and rebuilds. Engineered by S&S Cycle, the leader in M8 performance engineering. Drop-in replacement for stock bolts.

Fitment

• 2017–Current Harley-Davidson Milwaukee-Eight engines
• All M8 Touring models
• All M8 Softail models
• All M8 Cruiser models
• Direct bolt-on replacement

Features & Benefits

• Heat-Treated 8640 Steel - Premium material selection for durability
• 14% Stronger Than Stock - 200,000 psi ultimate tensile strength
• Superior Material Quality - Built from stronger steel than factory bolts
• Black Oxide Coating - Corrosion resistance for long-term reliability
• 9/16" 12-Point Head - Standard M8 sizing with integral washer
• Formed Threads - Precision thread geometry for consistent clamping
• Cold-Forged Construction - Precision manufacturing process
• Reusable Design - Can be reinstalled for maintenance and rebuilds
• Drop-In Replacement - No modifications or special tools required
• S&S Engineering - Built by the trusted name in M8 performance

Why Upgrade?

Your M8's cylinder head gets punished every time you fire it up—extreme heat, pressure, and stress all concentrated on those bolts. Stock head bolts are functional, but they're engineered to the bare minimum. S&S Cycle's Head Bolt Kit gives you 14% more strength with premium 8640 steel and 200,000 psi tensile strength. That means better clamping force, more consistent head gasket compression, and reliability you can count on. The black oxide coating protects against corrosion, so these bolts stay tight year after year. The 9/16" 12-point head with integral washer drops right in—no special tools or modifications needed. Whether you're running a stock M8, a performance build, or anything in between, these are the bolts that serious riders choose. S&S Cycle has been engineering M8 performance for years, and this bolt kit reflects that expertise. It's the kind of upgrade that works silently in the background, keeping your engine together while everything else gets the attention.

Note: S&S Cycle Head Bolt Kit for 2017–Current Milwaukee-Eight engines. Part 900-1006. Heat-treated 8640 steel. 200,000 psi ultimate tensile strength. 14% stronger than stock. Black oxide coating. 9/16" 12-point head with integral washer. Formed threads, cold-forged construction. Reusable. Direct replacement for all M8 Touring, Softail, and Cruiser models.