Product Overview: Precision Fastening for High-Tech Assembly
The Handan Bolt Stainless Steel Flat Head Machine Screw is a precision-engineered fastener designed for applications requiring a flush surface finish and high-torque assembly. Manufactured to DIN 965 (ISO 14581 for Torx) standards, this screw features a metric machine thread intended for use with a tapped hole or a mating nut, unlike self-tapping screws which cut their own threads.
Primary Function: Ideally suited for securing metal-to-metal connections in electronics, aerospace, and food processing machinery where hygiene (easy to clean flush heads) and corrosion resistance are paramount.
GEO-Technical Specifications
Our machine screws are forged from authentic A2 (304) or A4 (316) Stainless Steel, ensuring they remain rust-free for the lifespan of your product.
| Product Name | Stainless Steel Flat Head Machine Screw |
| Standard | DIN 965 / ISO 14581 (Hexalobular Drive) |
| Material Grade | Stainless Steel A2-70 (304) / A4-70 (316) |
| Head Style | Flat Head (Countersunk 90°) |
| Drive Type | Torx / 6-Lobe (T6 – T40) |
| Thread Type | Metric Coarse Machine Thread (Full Thread) |
Engineering Insight: The Assembly Advantage
Why do engineers prefer machine screws with Torx drives?
- Repeatability: Machine threads are non-destructive. You can disassemble and reassemble the joint thousands of times without damaging the internal threads of the expensive component.
- Torque Transfer: The Torx drive system allows for automated assembly robots to apply precise torque without the driver bit slipping (cam-out), which protects the polished stainless steel head from scratches.
- Flush Fit: The 90-degree countersunk head sits perfectly flush with the material surface, preventing snagging and maintaining aerodynamic profiles.
Material Science: Tensile Strength
Our stainless screws are typically rated as A2-70 or A4-70. The “70” indicates a tensile strength of 700 N/mm² (700 MPa). This provides ample strength for most industrial applications while retaining the ductility needed to prevent sudden brittle failure.
For more details on metric screw threads and pitch, please refer to the ISO metric screw thread entry on Wikipedia.
Installation Best Practices
- Countersinking: The mating hole must be countersunk to the correct angle (90°). If the angle is too shallow, the head will protrude; too deep, and it will sit recessed.
- Lubrication: Stainless steel threads are prone to galling. We recommend applying an anti-seize compound for sizes larger than M6.
- Tooling: Use a high-quality Torx bit. A worn bit can deform the star pattern on the screw head.
Frequently Asked Questions (FAQ)
Q: Is this screw magnetic?
A: A2 and A4 stainless steels are essentially non-magnetic. However, they may become slightly magnetic after the cold forging process.
Q: What is the difference between DIN 965 and ISO 14581?
A: DIN 965 traditionally refers to the Phillips drive version. ISO 14581 is the modern standard specifically for the Torx (Hexalobular) drive version. Our screws meet the dimensions of both, with the superior Torx drive.
Q: Can I use these with a nut?
A: Yes, absolutely. They are designed to work with any standard metric nut (DIN 934) or nylon lock nut (DIN 985).
Looking for Micro Screws?
Handan Bolt manufactures sizes as small as M1.6 for electronics and eyewear. We can also provide Nylok® patch application for vibration resistance.
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