S&S Cycle
S&S. M8 head bolt & stud kit
S&S. M8 head bolt & stud kit
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Direct replacement for the stock head bolts and cylinder studs. Quality is much higher and recommended for performance builds. Complete kit. Head bolts:- Black oxide coated - Heat treated 8640 steel - 200.000 psi ultimate tensile strength - 9/16" 12 point head with integral washer - Formed threads - Cold formed head - Re-usable cylinder studs - 4140 Chrome Moly - Oil quenched and tempered to 39-44 HRC - 180;000psi Tensile Strength - Rounded thread roots; rather than flat; improving fatigue strength - Positive stop shoulder allows for consistent installed height
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Why buy from Forty5°
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Verified compatibility
Every part we ship is checked against your bike's platform, year, and engine. If it doesn't fit, we tell you before you check out.
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Workshop installation
Book a serviceHave us fit it. Book installation at parts intake — same-day on most jobs, master techs only.
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Founder-led aftersales
Get in touchQuestions after fitment? You'll speak to the people who installed it. We answer email and WhatsApp seven days a week.