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Unifix Machine Screws - M5 x 16 - Silver

Unifix Machine Screws - M5 x 16 - Silver

The Unifix A2-304 St/St Machine Screws are designed for durability and reliability in various appl...

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Unifix A2-304 St/St Machine Screws M4 X 6 - Q209650000400006000 - Grey

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The RangeUnifix A2-304 St/St Machine Screws M4 X 6 - Q209650000400006000 - Grey
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eBayUnifix A2-304 St/St Machine Screws M4 x 6 - Q209650000400006000
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DebenhamsUnifix Unisex Silver A2-304 St/St Machine Screws M4 X 6 In
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OnBuy.comUnifix A2-304 St/St Machine Screws Pozi Csk Head M4 X 6 - Q209650000400006000 5014196321363
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B&QB&Q - A2-304 St/st Machine Screws Pozi Csk Head M4 X 6Q209650000400006000
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Product Information

Full details

This guide is for DIY enthusiasts and professionals seeking reliable fasteners for various projects. The Unifix A2-304 Stainless Steel Machine Screws offer excellent corrosion resistance and easy installation with their Pozi Csk head. A key caveat is ensuring the M5 x 16 size is appropriate for your specific application.

All features

ColourSilver
Model Part NumberQ209650000500016000
BrandUnifix

Extended Product Information

FAQs

What does A2-304 stainless steel mean?

A2-304 refers to a grade of stainless steel, often called 18/8 stainless steel. It's known for its good corrosion resistance, making it suitable for a wide range of applications, including food-grade uses and general outdoor exposure.

What is a Pozi Csk head?

A Pozi Csk head is a countersunk head with a Pozi drive recess. The countersunk design allows the screw to sit flush with the surface it's fastening, providing a neat finish. The Pozi drive offers better engagement and reduced cam-out compared to a standard Phillips head.

Can these screws be used outdoors?

Yes, the A2-304 stainless steel construction provides excellent resistance to corrosion, making them suitable for many outdoor applications. However, extreme conditions like constant saltwater exposure might affect them over very long periods.

What size drill bit should I use for an M5 screw?

For tapping into metal, a tap drill size of 4.2mm is typically used for an M5 thread. For clearance holes in metal, a 5.0mm or 5.5mm drill bit is common. For wood, a 4.0mm to 5.0mm drill bit is often recommended, depending on the desired tightness.

Are these screws magnetic?

A2-304 stainless steel is generally considered non-magnetic or weakly magnetic. It is less magnetic than other types of steel but may exhibit some magnetic properties, especially after cold working.

What is the difference between DIN 965Z and other DIN standards?

DIN 965Z specifies the dimensions and tolerances for countersunk head machine screws with a Pozi drive. Different DIN standards cover various screw types, head styles, drive types, and material requirements.

Troubleshooting

Screw head stripped during installation

Ensure you are using the correct size Pozi drive bit (PZ1 or PZ2). Apply firm, consistent downward pressure while turning. If the head is already stripped, consider using screw extractor tools.

Screw won't thread into the material

Verify that the material has a pre-drilled hole of the appropriate size for an M5 screw, or that you are using an M5 nut. Check for obstructions or damage in the existing thread or hole.

Visible rust or discoloration

Although resistant, stainless steel can develop surface discoloration in aggressive environments. Clean the affected area with a soft cloth and mild detergent. For persistent issues, consult specialized stainless steel cleaners.

Pros and Cons

Pros

  • Excellent corrosion resistance due to A2-304 stainless steel.
  • Pozi Csk head allows for a flush finish and secure driving.
  • Conforms to DIN 965Z standard for reliable performance.
  • Versatile size suitable for multiple material types.
  • Durable construction for long-lasting applications.

Cons

  • Specific M5 x 16 size may not fit all project requirements.
  • Pozi drive can be prone to cam-out if excessive torque is applied.
  • Stainless steel may not be suitable for extreme magnetic environments.
  • Requires appropriate Pozi driver bit for installation.

Setup, Compatibility & Care

Setup:

These are machine screws and are designed to be used with a corresponding nut or threaded hole. Ensure the threaded hole or nut has an M5 thread. Use a Pozi drive screwdriver (PZ1 or PZ2 depending on force required) or a compatible power tool bit to drive the screw.

Compatibility:

  • Materials: Suitable for use in wood, metal, and plastic.
  • Tools: Requires a Pozi drive screwdriver or bit.
  • Fastening: Compatible with M5 nuts or tapped M5 holes.
  • Standards: Complies with DIN 965Z.

Care:

While A2-304 stainless steel offers excellent corrosion resistance, prolonged exposure to harsh chemicals or saltwater might require occasional inspection. Clean with a damp cloth if necessary. Avoid abrasive cleaners that could scratch the surface.

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