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The Range£10.70Visit shop Unifix A2-70 St/St Socket Button Head Screws M4 X 8 - Box Of 1000 - Grey
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The Unifix A2-70 Socket Button Head Screws are precision-engineered fasteners designed for professionals and DIY enthusiasts who require reliable, corrosion-resistant hardware for mechanical and aesthetic assemblies. Featuring high-grade stainless steel construction and a low-profile head, they offer a clean finish and long-lasting durability, though users should ensure their tools are compatible with the specific internal hex drive size before beginning installation.
| Colour | Silver |
|---|---|
| Model Part Number | 5014196665207 |
| Brand | Unifix |
A2 refers to the grade of stainless steel (304), providing excellent corrosion resistance, while 70 indicates the tensile strength class (700 N/mm²).
While A2-70 offers good corrosion resistance, for continuous exposure to salt water or harsh marine conditions, A4 grade stainless steel is generally recommended.
Yes, provided you use the correct hex bit and use a low-torque setting to avoid stripping the socket or over-tightening.
Washers are not strictly required but are recommended if you are fastening soft materials or wish to distribute the clamping load more effectively across a larger surface area.
The socket button head is lower in profile and provides a cleaner, more finished look, reducing the likelihood of snagging on the bolt head.
Verify that your hex key is the correct metric size and is fully inserted into the socket before applying torque. Replace the hex key if the tip is worn.
Check that the thread pitch matches the tapped hole and ensure there is no debris or cross-threading present in the base material.
Proper installation begins with selecting the correct hex key size to prevent stripping the internal socket. Always ensure the tapped hole or nut matches the metric thread pitch of the specific Unifix screw variant. To maintain the integrity of the stainless steel, avoid using carbon steel tools if possible, as they can transfer iron particles and lead to surface rust. For long-term outdoor care, occasionally wiping the heads with a light protective oil or stainless steel cleaner will keep the silver finish free from debris or potential tea-staining in harsh marine environments.
