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Unifix Hexagon Setscrews - Grey

Unifix Hexagon Setscrews - Grey

The Unifix A4-316 Stainless Steel Hexagon Setscrews DIN 933 are designed for reliable fastening in...

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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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Product Information

Full details

The Unifix A4-316 Stainless Steel Hexagon Setscrews are designed for professionals and DIY enthusiasts who require high-performance, corrosion-resistant fastening solutions in demanding environments. Manufactured to DIN 933 standards, these screws offer superior durability and consistent load-bearing capacity; however, users should ensure they are selecting the specific thread pitch and length compatible with their existing hardware to prevent installation issues.

All features

ColourGrey
Model Part Number1262213
BrandUnifix

Extended Product Information

FAQs

What does A4-316 mean?

A4-316 denotes 'marine grade' stainless steel, which contains molybdenum, offering superior resistance to pitting and corrosion compared to A2-304 grades.

Can I use these with carbon steel nuts?

It is not recommended, as connecting different metals can trigger galvanic corrosion, which degrades the hardware.

Are these bolts fully threaded?

Yes, as per the DIN 933 standard, these hexagon setscrews are threaded along the full length of the shank.

What tools do I need for installation?

A standard metric spanner or socket wrench is required for the hexagonal head.

Can these be used for structural applications?

Yes, provided the load calculations confirm the M-size and grade are appropriate for the specific structural load requirements.

Troubleshooting

Bolt is difficult to turn or stuck during installation

Back the screw out and re-align, applying an anti-seize lubricant to the threads to prevent galling.

Tool slippage when tightening the hexagon head

Ensure the spanner or socket is the correct metric size and is seated fully onto the head before applying force.

Visible surface discoloration (tea staining)

Clean the surface with a stainless steel-specific cleaner or mild abrasive pad, then rinse thoroughly to restore the protective passive layer.

Pros and Cons

Pros

  • Excellent resistance to rust and environmental corrosion
  • Easy to install with standard manual or power tools
  • Consistent manufacturing quality meeting DIN standards
  • High tensile strength for demanding fastening tasks

Cons

  • Stainless steel can be prone to galling if tightened too rapidly
  • Limited to specific thread types and sizes available in the range
  • Higher initial cost compared to carbon steel alternatives

Setup, Compatibility & Care

Proper installation is vital for maintaining the performance of A4-316 stainless steel hardware. Always ensure that the hole diameter is correctly matched to the setscrew size to avoid unnecessary mechanical stress. When working with stainless steel, it is highly recommended to apply a small amount of anti-seize lubricant to the threads before tightening, as this prevents cold welding (galling). To maintain the aesthetic and structural integrity of the fasteners, rinse them with fresh water if they are used in high-saline or chemical environments. Store these fasteners in a dry, organized bin system away from non-stainless metals to prevent cross-contamination of metallic particles, which can initiate localized corrosion.

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