Titanium bolt M4x6 8 10 12 15 20 25 30 35 40mm Flange Torx Head Upper pump cover Screw for Bicycle and Motorcycle, Pitch 0.7mm, by Tianswer

Precision CNC-machined Aerospace Ti-6Al-4V Grade 5 titanium M4 flanged Torx T20 screws engineered specifically for motorcycle master cylinder reservoir caps, hydraulic brake pump covers, bicycle derailleur limit screws, and lightweight electronics mounts.

Torx T20 Drive: Zero Cam-Out & Anti-Strip Engineering

OEM hydraulic brake and clutch reservoir covers notoriously rely on soft steel Phillips (#1/#2 JIS) or small 2.5mm internal hex fasteners. Combined with corrosive brake fluid exposure, factory screws frequently round off, seize, or strip during routine fluid flushes. Our M4 bolts feature a precision-machined 6-lobe Torx T20 internal drive that eliminates cam-out force, ensuring 100% radial torque transfer and effortless removal season after season.

Integrated Flange Head: Leak-Free Uniform Clamping

Equipped with a low-profile 7.5mm diameter flanged base and 4.0mm head height, the integrated flange acts as a captive washer. It distributes clamping load uniformly across rubber diaphragm seals and aluminum reservoir caps without digging into or distorting delicate perimeter surfaces, ensuring a leak-proof hydraulic seal against vibration.

Impervious to DOT 3, DOT 4, & DOT 5.1 Brake Fluid

Glycol-ether and silicone-based hydraulic fluids rapidly deteriorate zinc coatings and induce galvanic corrosion between factory steel screws and cast aluminum master cylinders. Certified Grade 5 (Ti-6Al-4V) titanium forms a permanent passive titanium dioxide ceramic layer, rendering it completely impervious to brake fluid weeping, road salt, and harsh weather.

Key Applications

• Motorcycles & Scooters: Front & rear master cylinder reservoir top covers (Brembo, Nissin, Magura, Formula), handlebar throttle clamp housings, and bar-end mirror hardware.
• Road, Gravel & Mountain Bikes: Rear & front derailleur high/low (H/L) limit screws, shifter bar clamps, water bottle cage mounts, and computer/GPS mount brackets.
• RC Models & FPV Drones: Motor mounts, carbon fiber top plates, and camera gimbal brackets demanding high vibration resistance and minimum weight.

Specifications & Dimensions

Material: Certified Aerospace Ti-6Al-4V (TC4) Titanium Alloy, Grade 5
Thread Diameter: M4
Thread Pitch: 0.7mm (Standard Metric Coarse)
Drive Type: Torx T20 6-Lobe Star Drive
Head Style: Integrated Flanged Button Head
Head Diameter: 7.5mm
Head Height: 4.0mm
Weight: ~1.0–2.0g per piece (approx. 45% lighter than OEM steel fasteners)
Available Lengths: 6mm, 8mm, 10mm, 12mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm
Available Finishes: Natural Titanium, PVD Vacuum-Coated Gold, Rainbow, Burn Blue, PVD Deep Black

Installation & Torque Guidelines

For master cylinder reservoir covers and carbon bicycle components, hand-tighten evenly across diagonal screws to a modest 1.5–2.0 N·m (13–18 in-lb) to avoid pinching the rubber gasket. For structural M4 mechanical applications, torque up to 3.0 N·m (26 in-lb). Applying a tiny dab of anti-seize paste or synthetic grease ensures smooth, gall-free service. To learn more about preventing stripped screw heads and why Torx outperforms conventional drives, read our Guide to Preventing Titanium Fastener Stripping and Failure.

Price is for 1 bolt.