Titanium Bolt M5x16 18 20mm Hex socket cap screw with tapered head and Anti-fall off Ti Washer for Bike, Pitch 0.8mm, by Tianswer

Precision CNC-machined Aerospace Ti-6Al-4V Grade 5 titanium M5 tapered socket head cap screws with captive anti-fall-off titanium washers, engineered specifically for bicycle handlebar stem faceplates, steerer tube clamps, and seatpost binders.

Captive Anti-Fall-Off Titanium Washer Engineering

Unlike standard loose washers that drop and get lost during trailside handlebar angle adjustments or bike packing, our bolts feature a captive titanium washer retained on an undercut neck below the head. The precision washer serves two critical mechanical functions: it distributes clamping loads evenly across lightweight carbon fiber and CNC-machined aluminum stem faceplates, and prevents rotational galling between the bolt head and stem recess for buttery-smooth, accurate torque transfer.

Aerodynamic Tapered Cone Head Architecture

The 8.5mm diameter tapered cone profile is meticulously sculpted to shed redundant perimeter mass while maintaining a rigid 5.0mm head height. It houses a precision-machined 4mm internal hex drive with deep engagement, providing robust resistance against corner round-off during routine maintenance.

High-Stress Cockpit Fatigue Strength & Sweat Corrosion Immunity

Handlebar stems are subjected to intense alternating bending and twisting loads during out-of-the-saddle hill sprints, drop-ins, and aggressive cornering. Certified Grade 5 (Ti-6Al-4V) titanium delivers a minimum tensile strength of 950–1050 MPa (matching Class 10.9 steel) while cutting hardware weight by ~45%. Furthermore, titanium's self-passivating oxide film renders it completely immune to sweat corrosion—the leading cause of rusted, seized steel stem bolts on road and indoor trainer bikes.

Key Applications

• Bicycle Cockpit & Stems: 4-bolt handlebar stem faceplates and 2-bolt steerer tube clamp pinch bolts (compatible with 3T, ENVE, Zipp, Thomson, Deda, Ritchey, Specialized, Bontrager, and PRO stems).
• Seatpost & Saddle Hardware: Seatpost collar binder clamps and twin-bolt micro-adjust saddle rail clamps.
• Drivetrain & Brakes: Front and rear derailleur band clamps, braze-on adapter bolts, and flat-mount disc caliper frame fixings.

Specifications & Dimensions

Material: Certified Aerospace Ti-6Al-4V (TC4) Titanium Alloy, Grade 5
Thread Size: M5
Thread Pitch: 0.8mm (Standard Metric Coarse)
Head Style: Tapered Cone Socket Head with Captive Anti-Fall-Off Washer
Head Diameter: 8.5mm
Head Height: 5.0mm
Drive Type: 4mm Allen Key / Internal Hex Drive
Available Lengths: 16mm, 18mm, 20mm
Available Finishes: Natural Titanium, PVD Vacuum-Coated Gold, Rainbow, Burn Blue, PVD Deep Black

Installation & Torque Guidelines

Apply a thin smear of anti-seize paste or synthetic grease to the thread flanks and under the washer face prior to assembly. When installing a 4-bolt stem faceplate, tighten bolts incrementally in an 'X' pattern (top-left, bottom-right, top-right, bottom-left) to maintain an equal gap between the faceplate and stem body. Torque to 5.0–6.0 N·m (44–53 in-lb), never exceeding the maximum torque specified on your stem or handlebar. For more insights on selecting high-stress fasteners and avoiding common installation mistakes, read our Ultimate Guide to Choosing Titanium Fasteners.

Price is for 1 bolt with captive washer.