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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Not sure it fits?
Ask on WhatsAppPick your bike at the top of the page to see which parts are listed for it. For anything not listed, send us your VIN on WhatsApp and we'll confirm the fit before you order.
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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 Tuesday to Sunday, 11am–7pm.