Serrated Washer For Door And Window Hardware Metal Anti Slip Lock Washer

Qimao Metal Manufacturer provides high-quality Serrated Washer For Door And Window Hardware Metal Anti Slip Lock Washer in China. It looks like a regular flat washer at first glance, but flip it over and you’ll see sharp teeth along the edge (or inside the hole, depending on the type). Those teeth are the whole secret. When you tighten the screw or nut, the teeth bite into the metal surface and lock it in place. No more loosening from door slams or window vibrations.

Product Feature

l Teeth bite, not just grip – Unlike spring washers that rely on tension, this one uses sharp serrations to physically dig into the mating surface. Once it’s tight, it’s not going anywhere on its own.

l Made for moving parts – Door hinges, window friction stays, handle bases – anything that gets constant use. That’s where normal washers fail and this one earns its keep.

l Two styles, same job – External teeth (better grip, leaves marks) and internal teeth (cleaner look, smaller footprint). We stock both, or we can make either to your print.

l No special tools needed – Install the Serrated Washer For Door And Window Hardware Metal Anti Slip Lock Washer with a standard screwdriver or wrench. The only thing to watch is orientation (more on that below).

l Works with common screw sizes – M4, M5, M6 are the most popular for hardware. Also available from M3 up to M10. If you need something in between, just send us the drawing.

Product Parameter (Specification)

How To Use

Step 1 – Get the direction right

This is where most people mess up. The serrated side must face the part that turns – either the screw head or the nut. If you put the flat side against the turning part, it does nothing. Zero locking effect.

Step 2 – Clean the surface

Paint, dust, old grease – all of it will reduce how deep the teeth can bite. A quick wipe is usually enough.

Step 3 – Tighten until you feel the bite

As you tighten, you’ll notice the resistance suddenly increases and you might hear a light scratching sound. That’s normal. That’s the teeth embedding into the metal.

Step 4 – Don’t reuse after removal

Once you take the Serrated Washer For Door And Window Hardware Metal Anti Slip Lock Washer off, the teeth are already flattened or worn. Throw it away and use a new one. This isn’t us trying to sell more – it’s just how serrated washers work.

One more thing – If your door or window frame is soft aluminum, put a flat washer between the serrated washer and the frame. Otherwise the teeth might dig in too deep and damage the surface.

Q & A

Q: Can I use it on plastic or wood?

A: No. The teeth need metal to bite into. On plastic or wood, it just spins and does nothing.

Q: What torque should I use?

A: Standard torque for the screw size is fine. Don’t over-crush it – if you flatten the teeth completely, you lose the locking effect.

Q: Is it okay for outdoor windows?

A: Depends on the coating. Stainless steel or Dacromet finish is fine. Regular zinc plated will rust after a few seasons outside.

Q: Do I need a flat washer with it?

A: Not usually. But if the surface is soft (like pure aluminum) or painted, put a flat washer between the serrated washer and the soft surface.

Welcome to contact us and buy our Serrated Washer For Door And Window Hardware Metal Anti Slip Lock Washer!