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The Unifix A2-70 Socket Head Cap Screws are designed for professionals and hobbyists who require high-strength, reliable fastening solutions in environments where structural integrity and corrosion resistance are paramount. Built to the DIN 912 standard, these screws provide a secure, flush-mount fit through their signature socket head design, though users should note that they require specific hex key tools for proper installation compared to traditional slotted or Phillips drive screws.
| Colour | Silver |
|---|---|
| Model Part Number | A2-70 |
| Brand | Unifix |
A2 refers to the stainless steel grade (304), which offers good corrosion resistance, while 70 denotes the minimum tensile strength of 700 MPa.
While A2-70 has good corrosion resistance, it is not ideal for direct salt-water exposure; A4-grade stainless is recommended for marine environments.
A2-70 stainless steel is generally non-magnetic in its annealed state, but it may exhibit slight magnetism after the cold-working process of forming the head and threads.
A torque wrench is recommended for critical applications to ensure you do not exceed the bolt's yield strength or fail to meet the required clamping force.
They can be reused if the threads are not deformed and the socket head is not stripped, but for critical structural applications, fresh hardware is always advised.
Check for cross-threading and ensure the hole is clear of debris or paint; remove and restart the alignment.
Ensure you are using the correct metric size hex key and that it is not worn; if the socket is already damaged, replace the screw to prevent further stripping.
Consider using a medium-strength thread-locking compound or a matching spring washer to increase tension.
To achieve the best results, always ensure that your threaded hole is clean and free of metal shavings before insertion. When installing, use a high-quality hex key that fits snugly into the socket to avoid stripping the internal walls. While these screws are corrosion-resistant, they are not entirely immune to surface staining. For long-term maintenance, wipe them periodically with a light coat of machine oil if used in humid conditions. Ensure you match the screw pitch and diameter exactly to the tapped hole to prevent cross-threading, which can compromise the structural integrity of both the screw and the component.
