Product Details
Product Description
China factory direct supply zinc plated socket head cap screws grade 8.8 for wholesale. These reliable screws feature a cylindrical head with internal hex drive and full threading for versatile fastening applications. The zinc plating provides good corrosion resistance for indoor and general purpose use. Grade 8.8 offers excellent strength for most industrial applications. Perfect for machinery assembly, equipment manufacturing, and general maintenance. Bulk discounts available for distributors and OEM customers.
Technical Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Standard | ISO 4762, DIN 912 | Head Type | Socket Head |
| Drive Type | Hex Socket | Thread Type | Full Thread |
| Property Class | 8.8 | Finish | Zinc Plated |
| Material | Medium Carbon Steel | Tensile Strength | 800 MPa |
| Yield Strength | 640 MPa | Hardness | 22-32 HRC |
| Corrosion Resistance | Salt spray test 96 hours | Temperature Range | Up to 120°C |
Product Size (Popular Specifications)
Standard socket head cap screw specifications:
| Diameter (mm) | Diameter (Inch) | Length (mm) | Length (Inch) | Head Diameter (mm) |
|---|---|---|---|---|
| M4 | #8 | 8-40 | 5/16″-1-1/2″ | 7 |
| M5 | #10 | 10-50 | 3/8″-2″ | 8.5 |
| M6 | 1/4″ | 12-60 | 1/2″-2-1/2″ | 10 |
| M8 | 5/16″ | 16-80 | 5/8″-3″ | 13 |
| M10 | 3/8″ | 20-100 | 3/4″-4″ | 16 |
Note: Custom sizes available for OEM orders
Application Scenarios
Socket Head Cap Screws DIN 912 Grade 8.8 Zinc Plated are commonly used in industrial assembly, precision machinery, and mechanical structures that demand high tensile strength, stable torque performance, and reliable fastening under dynamic loads.The hex socket drive ensures efficient torque transfer, easy installation in confined spaces, and a clean, professional appearance. Typical application scenarios include:
- Machinery and equipment assembly — for frames, gear housings, and motion systems.
- Automotive and transportation components — ensuring durable fastening in engines and body structures.
- Electrical and electronic enclosures — providing secure connections with corrosion protection.
- Furniture and metal fabrication — for joints requiring a neat finish and strong grip.
- General maintenance and repair — ideal for equipment replacement and structural reinforcement.
- Automation systems and robotics — suitable for high-precision, repeatable fastening applications.
Frequently Asked Questions (B2B-oriented)
A: These screws combine high tensile strength (Grade 8.8) with precise manufacturing standards, making them reliable for machinery, equipment installation, and metal structure assembly. The internal hex drive allows safe tightening even in limited spaces.
A: Zinc plating provides a cost-effective way to protect the screws from rust and corrosion. It also gives a clean, bright surface that helps maintain appearance and performance during storage and use in normal industrial environments.
A: Yes. DIN 912 socket head cap screws are equivalent to ISO 4762 and ANSI B18.3 standards, which means they can be used in most international projects without modification or compatibility issues.
A: Reliable manufacturers perform strict dimensional, hardness, and coating thickness inspections according to ISO 898-1 and DIN 912 standards. Requesting material certificates (such as 3.1) and batch test reports helps verify consistency.
A: Standard export packaging includes bulk cartons with inner plastic bags or small boxes, placed on wooden pallets. Customized packaging with labels and barcodes can also be arranged to match your warehouse or distribution needs.