Product Description

Lightweight Grade 5 titanium M4 low-profile small-head socket bolts featuring a compact D5.5 mm head diameter, 3 mm Hex drive, and three length options for compatible handlebar grip lock ring and brake lever reach adjustment applications.

Specifications

• Thread Size: M4
• Head Diameter: D5.5 mm
• Head Style: Low-Profile Small-Head Socket
• Available Lengths: M4 × 8 mm / M4 × 10 mm / M4 × 12 mm
• Drive: 3 mm Hex
• Material: Grade 5 Titanium (Ti-6Al-4V)

Available Variants

Available Colors

Gold / Rainbow / Titanium / Black / Blue / Green / Purple / Candy / Indigo

Candy Finish

Due to the nature of the coloring process, the Candy finish features naturally flowing and variable color transitions. Each piece may have a slightly different appearance.

Thread Finish Notice

Slight uncolored or bright lines around the threaded area can occur as a natural result of the coloring process. This is a normal cosmetic characteristic and does not affect thread strength, material properties, or normal installation.

Grade 5 Titanium

S-PARTS works with a dedicated civil aerospace metal raw-material supply chain in Xi'an, China, providing carefully selected titanium materials for our fastener production.

Through long-term laboratory testing and comparative verification, titanium material is qualified against rigorous S-PARTS performance benchmarks before being used in production.

Our selected Grade 5 Titanium (Ti-6Al-4V) achieves an average tensile strength exceeding 1050 MPa, well above the commonly referenced industry benchmark of 895 MPa.

Under comparable conditions, S-PARTS Grade 5 titanium fasteners offer mechanical performance comparable to Class 10.9 high-strength steel fasteners, while weighing approximately half as much as steel.

This combination of high strength and low density provides an excellent strength-to-weight ratio for lightweight bicycle hardware.

Precision Forged & CNC Machined

The bolt head is hot-forged using custom S-PARTS tooling. To maintain forming accuracy during high-temperature production at approximately 650°C, each stamping die is limited to no more than 300 production cycles.

The fastener body is precision-machined using high-precision multi-axis CNC equipment. Micron-level tolerance control helps ensure accurate dimensions, clean threads, and consistent thread engagement.

The compact head profile is carefully formed and machined to maintain its distinctive small-head geometry while providing a clean, precise finish.

Laser-Engraved Logo

Each bolt features a precision laser-engraved S-PARTS logo on the top surface, adding a distinctive brand detail to the compact titanium head.

Advanced Surface Finishes

Gold, Rainbow, Black & Blue

These finishes use a PVD vacuum nitriding process to create a dense surface layer, improving surface hardness and resistance to impact and wear while producing rich, durable colors.

Green, Purple, Candy & Indigo

These finishes are produced through an anodic oxidation process, which forms a controlled oxide layer on the titanium surface.

The vibrant colors are created by light interference caused by variations in oxide-layer thickness, without conventional dyes. The process also contributes to the surface's corrosion resistance.

Key Features

• Grade 5 Titanium (Ti-6Al-4V)
• Low-Profile Small-Head Socket design
• Compact D5.5 mm head diameter
• Vertical cylindrical head profile with chamfered top edge
• 3 mm Hex drive
• M4 × 8 / M4 × 10 / M4 × 12 length options
• Lightweight: from 0.70 g/pc
• Precision laser-engraved S-PARTS logo
• Suitable for compatible handlebar grip lock ring and brake lever reach adjustment applications
• Precision-forged head and CNC-machined fastener body
• Average tensile strength exceeding 1050 MPa
• Mechanical performance comparable to Class 10.9 high-strength steel fasteners
• Approximately half the weight of comparable steel hardware
• Multiple titanium surface finishes

Installation & Compatibility

Please verify the original bolt's thread size, length, head diameter, and drive specification before ordering.

For installation, follow the torque specification and installation requirements provided by the original component manufacturer. Do not exceed the recommended tightening torque.