High Torque Extended Countersunk Linkage Screw
Stainless Steel bicycle High Torque Extended Countersunk Linkage Screw - Axles & Pivots
Stainless Steel High Torque Extended Countersunk Linkage Screw. 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 | M8 × 1.25 |
| Thread Accuracy | 6H (ISO 965-2) |
| Thread Direction | Right-hand |
| Hex Drive Size | 6 mm |
| Overall Length | 55 mm |
| Tolerance Grade | ±0.03 mm (smooth shafth7) |
02 Material & Performance
Material selection is optimized for the target bicycle application with verified mechanical properties and corrosion resistance.
| Parameter | Specification |
|---|---|
| Primary Material | 316 stainless steel (AISI 316) |
| Material Grade / Class | A4-80 (ISO 3506-1) |
| Applicable Standards | ASTM A276 / ISO 3506-1 |
| Tensile Strength | 800 MPa |
| Yield Strength | 600 MPa |
| Shear Strength | 480 MPa |
| Hardness | HRB 95-100 |
| Density | 8.0 g/cm³ |
| Process | cold heading |
| Surface Finish | natural pickled and polished finish |
03 Application & Compatibility
Designed for bicycle OEMs, assembly factories, and component brands that need repeatable supply with documented QC.
| Parameter | Specification |
|---|---|
| Frame Type | Enduro, DH project-specific |
| Typical Position | drawing-specific requirement |
| Accessory / Mating Part | main-link bearing pivot |
| Environment | project-specific, high-humidity and muddy environments |
| Compatible Standards | ISO 3506-1 / ISO 965-2 / DIN 7991 |
| Load Rating | drawing-specific requirement |
| Recommended Torque | 18-22 N·m |
| Maximum Torque | 28 N·m |
| Installation Method | threaded connection |
| Recommended Tool | 6 mm hex key and torque wrench |
| Thread Locker | Loctite 243 medium-strength blue threadlocker |
| Installation Position | Enduro/DHmain and secondary frame pivots |
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 | 200 hours ISO 9227 NSS, 316 stainless steel |
| Torque Verification | ISO 16047 |
| Hardness Testing | ASTM E18 Rockwell HRB |
| Thread Inspection | ISO 965-2 GO/NO-GO gauge inspection |
| Dimensional Inspection | 100% 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