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The Range£13.80Visit shop Unifix A4-316 St/St Hexagon Setscrews M6 X 20 - Q409330000600020000 - Grey
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The Unifix A4-316 Hexagon Setscrews (M10 x 35) are designed for professionals and DIY enthusiasts requiring high-strength, corrosion-resistant fastening in demanding environments. Constructed from marine-grade A4-316 stainless steel, these setscrews offer exceptional durability and longevity, making them an ideal choice for outdoor and coastal applications. Note that while their corrosion resistance is superior, they should be paired with compatible stainless steel nuts to prevent galvanic corrosion when used in wet or electrolytic settings.
| Colour | Grey |
|---|---|
| Model Part Number | 1260630 |
| Brand | Unifix |
A4-316 is a marine-grade stainless steel that contains molybdenum, which significantly increases resistance to corrosion, especially in chloride-heavy or salt-water environments.
You will need a standard 17mm metric spanner or socket wrench to fit the M10 hexagon head.
It is not recommended. Mixing stainless steel with galvanized or carbon steel can cause galvanic corrosion, which degrades the hardware.
Yes, these are hexagon setscrews, which typically feature threads that run the full length of the shank up to the head, compliant with DIN 933.
These screws are 35mm long, measured from the underside of the head to the tip of the thread.
Yes, A4-316 grade is suitable for submerged use in most water types, though regular inspection is recommended in salt-water settings.
Back the screw out and check for thread damage or debris. Use an anti-seize lubricant if resistance continues.
Ensure the spanner or socket is the correct size (17mm for standard M10) and is fully seated before applying force.
To ensure optimal performance, verify that the threads of the mating hole or nut are clean and free of debris. When installing, use a manual wrench or a socket set; avoid high-speed impact drivers, as stainless steel can occasionally seize or gall under extreme friction.
Compatibility is highest with other A4-grade stainless steel components to maintain the corrosion-resistant properties of the connection. If you are installing these in a permanent exterior location, a light application of anti-seize lubricant can make future removal much easier. Keep the items stored in a dry container to prevent surface contamination before installation.
