S-Parts Titanium 31.8mm Headset Top Cap Assembly – Carbon / Titanium

Precision detail. Zero compromise.

The S-Parts 31.8mm Headset Top Cap Assembly is a premium preload solution featuring a full TC4 Grade 5 titanium top cap with integrated carbon detailing, paired with a custom hollow-shaft titanium bolt.

Designed for standard 1 1/8” threadless steerers (31.8mm), this assembly delivers clean aesthetics, corrosion resistance and ultra-light performance in one refined package.

What Sets It Apart

• Full TC4 Grade 5 titanium top cap

• Integrated carbon centre detail

• Custom M6 x 30mm hollow shaft titanium bolt

• Deep T30 Torx interface for secure engagement

• Premium S-Parts presentation packaging

This isn’t just a cosmetic upgrade — it’s precision hardware built properly.

Specifications

• Diameter: 31.8mm (1 1/8” steerer compatible)

• Bolt: Custom M6 x 30mm hollow shaft titanium

• Material: TC4 Grade 5 Titanium with integrated carbon detail

• Weight: Approx. 6.2g per complete set

• Tool Interface: T30 Torx

• Use: Headset preload adjustment only

Built to Last

Manufactured from aerospace-grade TC4 (Ti-6Al-4V) titanium, this assembly offers:

• Excellent strength-to-weight performance

• Superior corrosion resistance

• Smooth torque application

• Long-term reliability

No rust. No seized threads. No cheap hardware.

Installation Note

This component is designed for headset preload adjustment only and is not a structural clamping bolt. Always tighten according to manufacturer-recommended torque settings.

Off The Front Take

It’s a small component — but it sits right at the centre of your cockpit.

If the rest of your build is premium, the top cap should be too.

Why Choose S-Parts Titanium Bolts & Screws?

Small upgrade. Massive difference.

S-Parts are one of the most respected names in titanium bicycle bolts and screws, producing lightweight bike hardware designed for riders who care about performance and finishing detail. Since 2010, they’ve specialised in precision fixings for road, gravel, mountain and performance builds — helping riders reduce weight, prevent corrosion, and finish a bike properly.

Whether you’re chasing grams or building a clean custom colourway, S-Parts is one of the easiest ways to upgrade the details that most bikes leave behind.

With 1000+ bolt and screw options, S-Parts covers everything from cockpit hardware and bottle cages to drivetrain, brake and suspension fixings.

Why Titanium?

Stock hardware works — until it doesn’t.

Titanium is trusted across cycling because it offers an elite balance of:

• low weight

• high strength

• corrosion resistance

• long-term durability

S-Parts components are manufactured from TC4 Grade 5 titanium (Ti-6Al-4V) — an aerospace-grade alloy known for excellent fatigue resistance and strength-to-weight performance.

Many S-Parts titanium bolts and screws offer strength comparable to high tensile steel hardware, while weighing significantly less and staying corrosion-free year-round.

S-Parts Bolt & Screw Colour Options

S-Parts titanium hardware is available in 9 standout colourways:

• Blue

• Black

• Candy

• Gold

• Green

• Indigo

• Purple

• Rainbow

• Titanium

Perfect for matching frames, finishing kits, accent builds and custom upgrades.

How Are S-Parts Bolts & Screws Coloured?

S-Parts uses two proven finishing methods to achieve durable, high-end colourways:

Vacuum Nitriding

Used for:
Black, Blue, Gold, Rainbow

A hard-wearing surface treatment designed for durability and long-term appearance.

Anodising

Used for:
Candy, Green, Indigo, Purple

An electrochemical process that creates vivid colours while maintaining titanium’s natural corrosion resistance.

Measuring Your Bolts & Screws (Important)

Bolt sizing can be confusing — especially when brands measure hardware differently.

For S-Parts products, bolt and screw length refers to the shaft length only:
✅ measured from under the bolt head to the end of the thread.

S-Parts thread sizes range from M3 through to M10, covering the most common bicycle applications.

If you’re unsure what size you need, contact us — we’ll help you match the correct part.

Installation Note

Always follow your component manufacturer’s official installation instructions and torque settings. If in doubt, use a torque wrench and reach out before fitting.

Weights may vary by ±2% due to manufacturing tolerances.

Popular S-Parts upgrades: Titanium stem bolts • Titanium bottle cage bolts • Titanium chainring bolts • Titanium brake caliper bolts