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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 are professional-grade fasteners engineered for heavy-duty applications where maximum durability and corrosion resistance are required. Ideal for tradespeople, marine engineers, and outdoor project builders, these screws offer a secure hold using standard hex tools. A key caveat is that while they excel in harsh environments, they require correct torque application to avoid over-tightening in softer materials.
| Colour | Grey |
|---|---|
| Model Part Number | 5014196331294 |
| Brand | Unifix |
A4-316 is a high-grade molybdenum-alloyed stainless steel that provides significantly better corrosion resistance than the standard A2 grade, making it ideal for marine use.
Yes, but use caution. Stainless steel can 'gall' (seize) under the high heat and rapid friction generated by impact drivers.
Due to the cold-working process during manufacturing, these may show a very slight magnetic attraction, but they remain highly corrosion-resistant.
Yes, for most materials, especially hardwoods or metal, pre-drilling is highly recommended to ensure the screw seats correctly.
DIN 933 specifies the requirements for hexagon head screws with a full thread, ensuring universal compatibility and quality.
Check the thread pitch for debris and consider using an anti-seize lubricant, especially in stainless-on-stainless applications.
Ensure the socket or spanner size is an exact match for the hexagon head and that the tool is fully seated before applying pressure.
Ensure the pilot hole is correctly sized for the diameter of the screw; do not force the screw beyond its recommended torque limit.
For optimal results, ensure the receiving hole is the correct diameter to allow for a snug fit. While the hexagon head is durable, use high-quality spanners to prevent rounding the head corners.
To maintain the integrity of the stainless steel, avoid using tools that have previously been used on mild carbon steel, as cross-contamination can lead to surface rust. If installing in stainless steel plates, use a thread lubricant (anti-seize) to prevent thread galling, a common phenomenon where stainless threads weld together under friction.
