Bicycle Fastener Selection Table | Specification, Material & Anti-Loosening Solution

Bicycle Fastener Selection Table | Material, Treatment & Anti-Loosening Solutions

According to working condition, strength requirement and service environment, we sort out the parameter table for core components, including standard sizes, drive types, recommended materials, surface treatments and supporting solutions for fast selection, procurement and assembly.

1. Road Bike (Lightweight Priority)

Position	Size	Drive Type	Material	Surface Treatment	Supporting Solution
Stem / Head Tube	M5×12~M5×20	Hex / T25 Torx	TC4 Titanium	Natural / Anodizing	Plain washer, lightweight design
Seatpost Clamp	M5×16 / M6×18	Cylinder / Countersunk	TC4 Titanium	Natural	Spring washer for anti-slip
Brake Caliper	M5×10~M5×14	T25 Torx	17-4PH Stainless Steel	Polishing / Passivation	Metal locking thread
Bottle Cage	M4×8 / M5×10	Pan Head Hex	TC4 Titanium / 316L	Natural	Plain washer, anti-rust for outdoor

2. Mountain / Gravel Bike (High Strength & Vibration Resistance)

Position	Size	Drive Type	Material	Surface Treatment	Supporting Solution
Disc Brake	M5×12 / M6×16	T25 / T30 Torx	17-4PH / Alloy Steel	Black oxide / Anti-rust passivation	Nylon lock washer + thread locker
Suspension Pivot	M6×20~M6×30	Hex Large Flange	High-strength Alloy Steel	Phosphating + Oil coating	Combined washer, double anti-loosening
Crank / Chainring bolt	M6×14 / M8×22	Countersunk / Cylinder	17-4PH Stainless Steel	Hard coating	Thread locker for high torque
Pedal / Frame Pivot	M8×18 / M10×25	External / Internal Hex	Grade 4.8 / 8.8 Carbon Steel	Galvanizing	Thick spring washer

3. E-Bike (High Strength & Insulation Safety)

Position	Size	Drive Type	Material	Surface Treatment	Supporting Solution
Motor Mount	M6×20 / M8×25	Internal Hex	Grade 8.8 Alloy Steel	Hot-dip Galvanizing	Insulating washer + lock washer
Battery Box	M5×16 / M6×18	Tamper-proof Torx	304 Stainless Steel	Chrome-free passivation	Anti-theft structure + thread locker
Controller & Wiring	M4×10 / M5×12	Pan Head Screw	304 Stainless Steel	Natural passivation	Plastic insulating gasket
Bottom Bracket	M10×30 / M12×35	Cylinder Hex	Grade 10.9 High-strength Steel	Black oxide	Stop washer for long-term vibration

4. Folding / City Bike (Anti-Rust & Portable)

Position	Size	Drive Type	Material	Surface Treatment	Supporting Solution
Folding Hinge	M5×14 / M6×16	Countersunk Hex	316L Stainless Steel	Mirror polishing	Thin spring washer
Quick Release	M6×22 / M8×24	Custom Head	7075 Aluminum + Stainless Steel	Color anodizing	Built-in circlip for anti-loosening
Fender / Rack	M4×8 / M5×10	Pan Head Phillips	304 Stainless Steel	Natural	Plain + spring washer set
Small Fitting	M3×6 / M4×10	Mini Pan Head	Eco-friendly Galvanized Steel	Blue-white zinc	Basic anti-loosening structure

5. General Notes for Selection

1. For coastal, rainy and sweat-rich areas, choose 316L stainless steel or titanium alloy for better salt spray resistance.

2. Use only plain washers on carbon fiber frames to avoid damage caused by over-tightening.

3. For high vibration parts, apply lock washers, thread locker or metal locking structure.

4. Use tamper-proof Torx or pentagon drive for anti-theft requirements.

5. Custom non-standard sizes and full bike fastener kits are available according to drawings and samples.

Bicycle Fastener Selection Table | Specification, Material & Anti-Loosening Solution