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Unifix Hexagon Setscrews M16 x 90 - Grey

Unifix Hexagon Setscrews M16 x 90 - Grey

The Unifix A4-316 Stainless Steel Hexagon Setscrews are engineered for secure and reliable fasteni...

Best current price£14.13from B&Q

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GreySilver

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B&QB&Q - A4-316 St/st Hexagon Setscrews M6 X 20Q409330000600020000
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The RangeUnifix A4-316 St/St Hexagon Setscrews M6 X 20 - Q409330000600020000 - Grey
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eBayUnifix A4-316 Hexagon Setscrews M6 x 20 - DIN 933
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DebenhamsUnifix Unisex Silver A4-316 Hexagon Setscrews M6 X 20 Din 933 In
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Tesco StoresUnifix A4-316 Hexagon Setscrews M6 X 20
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Product Information

Full details

The Unifix A4-316 Stainless Steel Hexagon Setscrews (M16 x 90) are ideal for professionals and DIY enthusiasts requiring high-strength, corrosion-resistant fastening in demanding environments. Engineered from marine-grade A4-316 stainless steel, these screws provide exceptional longevity in outdoor or saltwater conditions, though they are primarily designed for industrial applications requiring standard hex-head compatibility.

All features

ColourGrey
Model Part Number1261829
BrandUnifix

Extended Product Information

FAQs

Are these screws suitable for saltwater environments?

Yes, the A4-316 stainless steel construction is specifically designed to resist corrosion in marine and coastal settings.

What tool size do I need for these M16 screws?

These screws require a 24mm wrench or socket to install.

Do these screws come with nuts?

No, this product listing is for the setscrew only. Please ensure you source compatible M16 nuts separately.

What is the length of the bolt?

The bolt length is 90mm, measured from the underside of the head to the tip of the thread.

Does DIN 933 refer to full or partial threading?

DIN 933 specifies that these are fully threaded setscrews, meaning the thread runs from the tip all the way to the underside of the head.

Troubleshooting

Bolt is difficult to screw into a tapped hole

Verify the thread pitch matches the M16 standard and ensure the hole is clear of debris or paint buildup.

Hex head rounding during installation

Ensure you are using a 24mm socket or wrench; verify the tool is fully seated on the hex flats before applying torque.

Pros and Cons

Pros

  • Excellent resistance to rust and environmental degradation
  • High-grade stainless steel construction for long-term durability
  • Easy to drive with standard hexagonal tools
  • Consistent quality guaranteed by DIN 933 standards

Cons

  • Material cost higher than zinc-plated alternatives
  • Size is specific to heavy-duty applications
  • Requires proper tool sizing to prevent head rounding

Setup, Compatibility & Care

To install, use a standard 24mm wrench or socket set to engage the hexagon head. When fastening into metal, ensure the receiving hole is drilled to the correct tolerance to prevent cross-threading. Because A4-316 is a high-quality alloy, it is generally maintenance-free; however, if installed in a marine environment, periodic inspection for debris or crevice corrosion is advised. Ensure the bolt is fully seated to maintain the structural integrity of your assembly.

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