S-Parts TC4 Titanium Seat Mast Clamp Bolt

Trek Integrated Seat Mast Compatible — M6 x 35 — Deep 5mm Hex

A small part — but one that matters.

Trek seat mast hardware sits right in the spray zone, gets torqued repeatedly, and is one of the first areas to show corrosion over time. This S-Parts titanium clamp bolt is a direct replacement for Trek integrated seat mast clamp hardware, made from Grade 5 (TC4) titanium for long-term reliability, clean finish, and consistent clamping.

Built for year-round bikes. Finished for high-end builds.

Compatibility

Direct fit for Trek integrated seat mast systems on:

✅ Madone (2016+)
✅ Domane (2019+)
✅ Speed Concept (2022+)
✅ Trek road alloy mast cap

Specs

• Thread: M6

• Size: M6 x 35

• Length: 30mm (typical, model dependent)

• Material: S-Parts TC4 Titanium (Ti-6Al-4V)

• Weight: 3.95g per bolt

• Tool Required: Deep 5mm Hex

• Finish Options: Candy, Blue, Black, Titanium

Details that matter

• CNC machined for clean threads and smooth torque feel

• Titanium strength + corrosion resistance (no rust, no seized hardware)

• Subtle S-Parts branding: laser-etched graphics + stamped head logo

• Designed for consistent clamp force and long-term stability

Installation Note

Use a torque wrench and always follow Trek’s official torque specification for your seat mast clamp.

Aftermarket component. Not affiliated with or endorsed by Trek Bicycle Company.

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