S-Parts TC4 Titanium Rear Derailleur Limit Screws

M4 x 12mm — Shimano / SRAM Compatible (Limit Screw Replacement)

Limit screws aren’t glamorous — but they’re one of the most important bolts on the derailleur.

These S-Parts M4 x 12 titanium limit screws replace standard steel hardware with Grade 5 (TC4) titanium, giving you a cleaner finish, corrosion resistance, and a properly premium detail on the back of the bike.

Ideal for riders building a dialled drivetrain where every bolt matches the level of the components.

What they do

Rear derailleur limit screws control the derailleur’s travel at both ends of the cassette — helping prevent:

• over-shifting into the spokes

• over-shifting off the smallest cog

• noisy or inconsistent setup

Compatibility

Designed as an M4 x 12mm limit screw replacement for many Shimano and SRAM rear derailleurs.

Specs

• Size: M4 x 12mm

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

• Tool Required: 2mm Hex

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

We are currently only shipping items within the UK only.

Shipping is Free Of Charge for all orders over £30

For orders lower than £30 a flat rate of £3.39 applies to all orders and all orders under £30 will be sent using Royal Mail Tracked 48 service.

All orders over £30 will be sent on a 48-hour Tracked and Insured delivery service.  If you have any special requirements regarding the delivery services please leave a comment on your order and we will do our very best to accommodate your requests.  We all ride and understand that from time to time there is a rush to get product for the weekend.

If a product is in stock in our warehouse we aim to dispatch the order within 24hrs.