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SAE Grade 5 UNC Hexagon Setscrews 1/4-20 UNC x 2 - Silver

SAE Grade 5 UNC Hexagon Setscrews 1/4-20 UNC x 2 - Silver

These SAE Grade 5 UNC Hexagon Setscrews are engineered for high tensile applications, providing su...

Best current price£12.98from The Range

Colour
BlackGreySilver

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Product Information

Full details

The Unifix SAE Grade 5 UNC Hexagon Setscrews are professional-grade fasteners designed for engineers, mechanics, and DIY enthusiasts who require high-tensile strength in demanding applications. These screws provide reliable, heavy-duty holding power for critical joints and mechanical assemblies, though they are specifically threaded for coarse-thread (UNC) compatibility rather than fine-thread (UNF) hardware.

All features

ColourSilver
Model Part Number5014196307336
BrandUnifix

Extended Product Information

FAQs

What does the 1/4-20 UNC designation mean?

This refers to the nominal diameter of 1/4 inch with 20 threads per inch, following the Unified National Coarse (UNC) standard.

Can I use these with UNF nuts?

No. UNC (coarse) and UNF (fine) threads are not compatible. Using them together will cause thread damage.

Are these suitable for automotive engine use?

Yes, SAE Grade 5 is commonly used in automotive applications, provided they meet the specific grade requirements of your engine assembly manual.

Does the length include the head?

Typically, the length measurement for a hexagon setscrew is measured from the underside of the head to the tip of the thread.

How do I maintain the finish?

Keep the screws clean and dry; a light coat of high-quality grease or oil can significantly extend the lifespan of the finish.

Troubleshooting

Screw binds or resists turning

Back out the screw completely and check the thread pitch; ensure it is a 1/4-20 UNC thread and not a fine-thread (UNF) component.

Head rounding during installation

Ensure you are using the correct metric or imperial socket size that matches the hexagon head profile; avoid using pliers.

Corrosion spots appearing

Remove the screw, clean the surface with a wire brush, and apply a light machine oil or anti-corrosive spray.

Pros and Cons

Pros

  • High-tensile material provides superior structural integrity
  • Hexagon head design simplifies installation and removal
  • Corrosion-resistant finish enhances longevity
  • Standard UNC threading ensures wide hardware compatibility

Cons

  • Not suitable for fine-thread (UNF) applications
  • Silver finish may require additional lubrication in high-heat environments
  • Limited to specific 1/4-20 thread pitch

Setup, Compatibility & Care

For optimal performance, verify that your mating threads are clean and free of debris before insertion. To prevent galvanic corrosion, consider applying a thin layer of anti-seize lubricant if the screws are intended for outdoor or moisture-prone environments. Always use a calibrated wrench to reach the correct torque specification for your specific project. When storing these bolts, keep them in a dry, organized bin away from harsh chemicals to maintain the integrity of the silver protective coating.

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