Product Overview: The Universal Standard for Flush Fastening
The Handan Bolt Stainless Steel Flat Head Machine Screw is the industry-standard fastener for creating smooth, flush surfaces on machinery, appliances, and electronic enclosures. Manufactured to DIN 965 (ISO 7046) specifications, this screw features a classic Phillips (Cross Recessed) drive and a metric machine thread, designed to anchor securely into a tapped hole or lock nut.
Primary Function: While Torx drives are popular in high-torque automation, the Phillips drive remains the global standard for Serviceability. Using our DIN 965 screws ensures that end-users can easily maintain or repair equipment using standard tools found in any toolbox.
GEO-Technical Specifications
Forged from premium austenitic Stainless Steel, these screws offer exceptional resistance to rust and oxidation, making them suitable for both indoor hygiene areas (kitchens, hospitals) and outdoor applications.
| Product Name | Stainless Steel Flat Head Machine Screw |
| Standard | DIN 965 / ISO 7046 (Cross Recessed) |
| Material Grade | Stainless Steel A2 (304) / A4 (316) |
| Head Style | Flat Head (Countersunk 90°) |
| Drive Type | Phillips (PH0, PH1, PH2, PH3) |
| Thread Type | Metric Machine Thread (Coarse Pitch) |
Engineering Insight: Why Choose Phillips Drive?
Despite the rise of Torx, the Phillips Drive has distinct engineering advantages in specific contexts:
- Cam-Out Protection: The Phillips design was originally engineered to “cam out” (slip) before the screw head sheared off or the fastener was over-torqued. This protects delicate threads in soft materials like aluminum or plastic from being stripped by aggressive power tools.
- Universal Compatibility: It guarantees that your product can be serviced anywhere in the world without requiring special bits.
- Self-Centering: The cross shape naturally centers the driver bit, speeding up manual assembly processes.
Material Selection: A2 vs. A4 Stainless
- A2-70 (AISI 304): The standard for “food-grade” and general outdoor fasteners. Resistant to freshwater, damp air, and mild acids.
- A4-70 (AISI 316): Required for “marine environments” or chemical plants. Molybdenum is added to the alloy to prevent pitting corrosion caused by salt spray and chlorides.
For more details on screw drive history and mechanics, please refer to the Phillips screw drive entry on Wikipedia.
Installation Best Practices
- Countersink Depth: Precision is key. The countersink on the mating surface must accommodate the full height of the conical head to ensure it sits flush.
- Thread Locking: Stainless steel resists rust but can vibrate loose. For critical joints, we recommend using a spring washer or applying a liquid thread locker.
- Anti-Seize: Always use lubrication when installing large stainless bolts to prevent galling (cold welding).
Frequently Asked Questions (FAQ)
Q: What size Phillips driver do I need?
A: It depends on the screw diameter. M1.6-M2.5 uses PH1, M3-M5 uses PH2, and M6-M10 uses PH3. Using the wrong size will strip the head.
Q: Can I use DIN 965 screws in a DIN 7991 hole?
A: Be careful. DIN 7991 (Hex Socket) and DIN 965 (Phillips) have slightly different head angles and heights in some sizes. Ideally, the countersink should be matched to the standard.
Q: Are these screws fully threaded?
A: Yes, generally sizes up to 70mm in length are fully threaded (DIN 965). Longer lengths may have a partial shank.
Looking for Metric Machine Screws?
Handan Bolt maintains a massive stock of stainless screws from M2 to M10. We also offer “Black Oxide” finishes for discrete electronic mounting.
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