Socket Head Cap Screw
Alloy Steel bicycle Socket Head Cap Screw - Screws & Bolts
10B38 Carbon Steel bolt / screw Cold-headed & thread-rolled. Built for OEM bicycle assembly with traceable material and consistent quality.
01 Dimensions & Tolerances
Core dimensions are controlled for repeatable bicycle frame assembly. Custom dimensions, tolerances, and surface finish can be supplied from drawing.
| Parameter | Specification |
|---|---|
| Thread Size | M5 × 0.8 |
| Thread Accuracy | 6g (ISO 965-2) |
| Thread Direction | Right-hand |
| Head Diameter | 8.5 mm |
| Head Height | 5 mm |
| Screw Length | 12-25 mm, multiple specifications |
| Hex Drive Size | 4 mm |
| Overall Height | 17-30 mm |
| Tolerance Grade | ±0.05 mm |
02 Material & Performance
Material selection is optimized for the target bicycle application with verified mechanical properties and corrosion resistance.
| Parameter | Specification |
|---|---|
| Primary Material | 10B38 carbon steel |
| Material Grade / Class | 8.8 (ISO 898-1) |
| Applicable Standards | ASTM A29 / ISO 898-1 |
| Tensile Strength | 800 MPa |
| Yield Strength | 640 MPa |
| Shear Strength | 480 MPa |
| Hardness | HRC 22-32 |
| Density | 7.85 g/cm³ |
| Process | Cold-headed & thread-rolled |
| Surface Finish | black oxide (Standard) / drawing-specified option |
03 Application & Compatibility
Designed for bicycle OEMs, assembly factories, and component brands that need repeatable supply with documented QC.
| Parameter | Specification |
|---|---|
| Frame Type | all bicycles |
| Typical Position | rack mounting hole, fender installation project-specific, additional accessory cable fixing |
| Accessory / Mating Part | rack, fender, brake mount, auxiliary accessory |
| Environment | indoor and outdoor use |
| Compatible Standards | ISO 68-1 / ISO 965-2 / DIN 912 |
| Load Rating | standard |
| Recommended Torque | 4-6 N·m |
| Maximum Torque | 8 N·m |
| Installation Method | threaded connection |
| Recommended Tool | 4mmhex key |
| Thread Locker | Loctite 243 medium-strength blue threadlocker |
| Installation Position | fender, rack, brake mountetc.project-specific |
Installation Steps
04 Quality Assurance
Each production batch can be supplied with traceability records, inspection data, and packaging labels for OEM receiving control. SGS/TUV third-party test reports available on request.
| Test / Inspection | Standard & Criteria |
|---|---|
| Salt Spray Test | 24 hours for black oxide; 1,000 hours for Dacromet treatment to ISO 10683 |
| Torque Verification | ISO 16047 |
| Hardness Testing | ASTM E18 Rockwell HRC |
| Thread Inspection | ISO 965-2 GO/NO-GO gauge inspection |
| Dimensional Inspection | AQL 4.0 sampling inspection |
05 Packaging & Ordering
Standard bulk packaging is available for assembly lines. Custom labels, kitting, and retail packaging can be prepared for brand programs.
| Parameter | Specification |
|---|---|
| Standard Pack | 500 pcs/bag |
| Packaging Material | PE resealable bag + corrugated carton |
| Industry Batch Reference | 1,000 pcs/specification for standard parts / 500 pcs/specification for other items |
| Batch Pricing Model | tiered volume pricing with no mandatory MOQ |
| Required Quote Data | Size, material, finish, quantity, drawing if custom |
Send your drawing, sample, or BOM and our team will confirm material, thread fit, finish, packaging, and lead time.
Technical Inquiry
Send drawings or STEP files. Engineering response within 24 hours.
Send DrawingRequest Quotation
Specify quantity, material, finish, and packaging. Quotes in 24 hours.
Get QuoteTrial Order
Start with a small batch to validate fit, finish, and assembly workflow.
Order Samples