Titanium Bolt M8x10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90mm DIN7991 Full Thread Flat Countersunk Hex Socket Head Screw for Bike Motorcycle, Pitch 1.25mm, by Tianswer

Aerospace-grade Ti-6Al-4V Grade 5 titanium M8 DIN 7991 (ISO 10642) full-thread flat countersunk hex socket head screws engineered for flush aerodynamic mounting, motorcycle rear sets, and automotive motorsport chassis panels.

DIN 7991 90° Countersunk Flush Mount Architecture

The DIN 7991 / ISO 10642 specification features a precision 90-degree flat countersunk head with a 16.0mm outer head diameter. When installed into properly chamfered mating holes, the screw sits 100% flush with the component surface. This eliminates mechanical protrusion, preventing snag hazards against boots, chains, bodywork, or chassis sliders while providing an ultra-clean, aero-efficient appearance across visible motorsport assemblies.

Critical Metrology & Length Measurement Rule

Unlike conventional cap screws or hex bolts where length is measured strictly beneath the head, DIN 7991 countersunk screws are measured OVERALL (total length including the 90° head). Because the conical head sits inside the countersunk recess, nominal length corresponds directly to the total depth of the fastener hole. If you need assistance selecting the correct replacement size, consult our detailed Fastener Metrology Guide: How to Measure Bolt Length, Diameter & Thread Pitch.

Full-Thread Engineering & Aerospace Titanium Strength

Featuring full continuous precision CNC-rolled threading from 10mm all the way to 90mm lengths, these bolts offer maximum thread engagement versatility across thin brackets, threaded blind holes, and through-bolted assemblies. Manufactured from certified Grade 5 Ti-6Al-4V titanium, they deliver tensile strength exceeding 950 MPa with over 45% weight savings compared to Class 10.9 steel countersunk screws, along with permanent immunity to rust and galvanic corrosion.

Key Applications

• Motorcycles & Road Racing: Footpeg brackets, rear-sets, skid plates, frame slider mounting plates, exhaust hanger brackets, and flush belly pan fasteners.
• Motorsport & Automotive: Floor pans, pedal box mounting plates, roll cage gusset attachments, front splitter undertrays, and aerodynamic rear diffusers.
• Downhill MTB & Bicycles: Bashguards, chain guides, and flush suspension pivot linkage covers.

Specifications & Dimensions

Material: Certified Aerospace Ti-6Al-4V (TC4) Titanium Alloy, Grade 5
Standard: DIN 7991 / ISO 10642 Flat Countersunk Socket Screw
Thread Size: M8
Thread Pitch: 1.25mm (Standard Metric Coarse)
Head Profile: 90° Flat Countersunk Head (16.0mm Head Diameter)
Drive Type: 5mm Allen Key / Hex Socket Drive
Threading Profile: Full Continuous Thread
Available Lengths (Overall): 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm
Available Finishes: Natural Titanium, PVD Vacuum-Coated Gold, Rainbow, Burn Blue, PVD Deep Black

Installation & Torque Guidelines

Ensure the recipient countersunk chamfer is clean and free of burrs. Apply a thin film of anti-seize paste or medium-strength thread locker to the threads and conical seat. Tighten using an unworn 5mm hex wrench to a recommended torque of 14–17 N·m (do not exceed 18 N·m to protect the shallow countersunk hex drive pocket). To avoid tool rounding and drive damage, review our Titanium Fastener Failure & Strip Prevention Guide.

Price is for 1 bolt.