S&S Cycle Head Bolts — Harley-Davidson

S&S Cycle Chrome Moly head studs engineered for high-performance Harley-Davidson engines, forged from 4140 Chrome Moly and heat-treated to 39-44 HRC for superior fatigue resistance. Purpose-built to replace stock studs in performance and forced-induction builds where stock hardware becomes a failure point.

Features

• 4140 Chrome Moly material, oil quenched and tempered
• Rounded thread roots improve fatigue strength versus flat-root studs
• Positive stop shoulder for consistent installed height
• 180,000 psi tensile strength

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 900-1176
• Material: 4140 Chrome Moly
• Hardness: 39-44 HRC
• Tensile Strength: 180,000 psi
• Weight: 4 lb
• Category: Fabrication / Bolts

Fitment

Fits Harley-Davidson models. Verify application with S&S Cycle or consult your engine builder for specific year and model compatibility.

Frequently Asked Questions

What's the advantage of rounded thread roots?

Rounded roots distribute stress more evenly and resist cracking under high combustion pressure and torque cycles compared with flat-root studs.

Do these require special installation?

The positive stop shoulder means consistent clamping height with standard torque specs. Follow S&S Cycle installation instructions and use a quality torque wrench.

Are these better than stock Harley studs?

Yes — 4140 Chrome Moly with 180,000 psi tensile strength is significantly stronger than OEM studs, critical for performance and boosted engines.

Will these work on a stock engine?

They will work, but stock engines rarely need upgraded studs. Highly recommended for performance builds, strokers, and forced-induction applications.