Countersunk Head Derailleur Hanger Bolt
Alloy Steel bicycle Countersunk Head Derailleur Hanger Bolt - Screws & Bolts
10B38 Carbon Steel bolt / screw (forged derailleur hanger) Hot-forged + CNC finished + heat treated + thread-rolled + zinc-plated. 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 | M6 × 1.0 |
| Thread Accuracy | 6g (ISO 965-2) |
| Thread Direction | Right-hand |
| Head Diameter | 12 mm |
| Head Height | 3.5 mm with 90-degree countersunk head |
| Screw Length | 16 mm |
| Hex Drive Size | 5 mm |
| Overall Height | 19.5 mm |
| Finish Tolerance | critical fit dimensions h7 (0/-0.018 mm) / non-fit dimensions +/-0.1 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 / ASTM A788 |
| Tensile Strength | 800 MPa |
| Yield Strength | 640 MPa |
| Shear Strength | 480 MPa |
| Hardness | HRC 22-32 |
| Density | 7.85 g/cm³ |
| Process | Hot-forged + CNC finished + heat treated + thread-rolled + zinc-plated |
| Surface Finish | blue-white zinc passivation as standard / Dacromet premium option to ISO 10683 with 1,000 h salt spray |
03 Application & Compatibility
Designed for bicycle OEMs, assembly factories, and component brands that need repeatable supply with documented QC.
| Parameter | Specification |
|---|---|
| Frame Type | project-specific frame, road bike, gravel bike |
| Typical Position | rear triangle derailleur hanger, project-specific installation |
| Accessory / Mating Part | drawing-specific requirement |
| Environment | indoor and outdoor use |
| Compatible Standards | ISO 68-1 / ISO 965-2 / DIN 7991 / ISO 4210-10 frame components / ASTM A788 |
| Load Rating | drawing-specific requirement |
| Recommended Torque | 9-11 N m, increased torque for forged parts |
| Maximum Torque | 13 N·m |
| Installation Method | threaded connection |
| Recommended Tool | 5 mm hex key and torque wrench |
| Thread Locker | Loctite 243 medium-strength blue threadlocker |
| Installation Position | rear triangle derailleur hanger mounting point |
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 | 72 hours ISO 9227 NSS |
| Torque Verification | ISO 16047 |
| Hardness Testing | ASTM E18 Rockwell HRC |
| Thread Inspection | ISO 965-2 GO/NO-GO gauge inspection |
| Dimensional Inspection | AQL 2.5 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