Sealey Form C Flat Washer M5 x 12.5mm - Silver - FWC512

The Sealey FWC512 Form C Metric flat washer is designed with a wider diameter than standard form A...

Best current price£1.42from Power Tools Direct

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Power Tools DirectSealey Fwc512 Flat Washer M5 X 12.5Mm Form C Pack Of 100
£5.95 delivery
£1.42
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Rapid Online - Rapid Electronics Ltd.Sealey FWC512 Flat Washer M5 x 12.5mm Form C BS 4320 Pack of 100
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£2.04
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eBaySealey Flat Washer M5 x 12.5mm Form C BS 4320 Pack of 100
£3.50 delivery
£3.40
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OnBuy.comFlat Washer M5 X 12.5Mm Form C Pack Of 100 5054511061192
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£4.94
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B&QB&Q - Flat Washer M5 X 12.5mm Form C Bs 4320Pack Of 100 Silver Fwc512
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£5.57
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Product Information

Full details

The Sealey FWC512 Form C Metric flat washer is designed for professional mechanics, DIY enthusiasts, and engineers who require a broader surface area for secure fastening. These M5 washers offer an increased clamping area compared to standard counterparts, ensuring better load distribution and protection for the substrate. While they provide excellent structural integrity, users should note that the 12.5mm outer diameter requires sufficient clearance in the mounting area to prevent interference with adjacent components.

All features

ColourSilver
Model Part NumberFWC512
BrandSealey

Extended Product Information

FAQs

What does Form C mean in this context?

Form C refers to the outer diameter of the washer. It is wider than standard Form A or B washers, which provides a larger contact area.

Are these stainless steel?

The product information specifies a silver finish, but it does not specify stainless steel. Check for magnetic properties if you require non-corrosive stainless steel material.

How many washers come in the package?

Each bag contains 100 individual washers.

Can I use these on M6 bolts?

No, these are M5 washers. They are sized for 5mm diameter bolts and will not fit over larger M6 hardware.

Are they reusable?

If the washer is not deformed or damaged after removal, it can typically be reused in secondary applications.

What is the standard they are manufactured to?

They are manufactured to BS 4320 standards.

Troubleshooting

Washer does not sit flush against the surface

Check for obstructions near the mounting point or burrs on the fastener hole that may be preventing the washer from laying flat.

Fastener feels loose despite tightening

Verify that the washer is the correct M5 internal diameter and that you have not stripped the threads on the bolt or the receiving nut.

Pros and Cons

Pros

  • Wider diameter provides superior surface area for clamping
  • High-quality construction meeting BS 4320 standards
  • Resealable bag prevents loss and keeps hardware organized
  • Ideal for distributing load on softer or thin materials

Cons

  • Larger footprint may not fit in tight or recessed mounting spaces
  • Only available in M5 size which limits universal application
  • Zinc-style silver finish may require additional corrosion protection in extreme outdoor environments

Setup, Compatibility & Care

To ensure proper performance, verify that the M5 thread size matches your bolt or machine screw exactly. Because these are Form C washers, verify that your component layout has at least 13mm of clearance surrounding the fastener hole to accommodate the 12.5mm diameter of the washer.

Care Instructions:

  • Keep the washers stored in their original resealable bag to maintain a moisture-free environment.
  • If working in humid or salt-heavy environments, consider applying a light coat of machine oil to prevent premature surface oxidation.
  • Discard and replace any washers that show signs of deformation or cracking after significant torque application.

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