RS PRO, M12

View all Washers
Bulk discount available

Subtotal (1 bag of 100 units)*

R 79,48

(exc. VAT)

R 91,40

(inc. VAT)

Add to Basket
Select or type quantity
In Stock
  • Plus 442 unit(s) shipping from 06 April 2026
Need more? Click ‘Check delivery dates’ to find extra stock and lead times.
Bag(s)
Per Bag
Per unit*
1 - 4R 79.48R 0.795
5 - 9R 77.49R 0.775
10 +R 75.17R 0.752

*price indicative

RS stock no.:
187-0585
Manufacturer:
RS PRO
Find similar products by selecting one or more attributes.
Select all

Brand

RS PRO

Compatible Screw/Bolt Size

M12

External Diameter

20.5mm

Inside Diameter

4.3mm

Thickness

0.50mm

RS PRO Plain Stainless Steel Internal Tooth Shakeproof Washer, M4, A2 304


This internal tooth shakeproof washer can be used at home or in the workplace to prevent nuts, bolts and screws from coming loose. It’s part of our trusted RS PRO range.

These shakeproof washers have serrated prongs (or teeth) inside a metal disc. The disc works to hold the screw in place, while the teeth lock into the head of the nut being tightened. The teeth are slightly bent to provide a secure hold and will not budge under the strain of weight or vibrations.

This washer is made of a stainless steel material that's hardwearing, low-maintenance and resistant to corrosion. As the teeth are located inside the disc, the finished product has a more discreet appearance than external lock washers.

These washers are designed for use with M4 screws and bolts. They’re RoHS-compliant as containing minimal amounts of restricted hazardous substances.

Features and Benefits


• Internal shakeproof washer

• For M4 screw and bolt size

• Internal tooth washer type

• Inside diameter of 4.3 mm

• Outer diameter of 8 mm

• Thickness of 0.5 mm

• Made from corrosion-resistant stainless steel (type A2 304)

• Plain finish

• RoHS compliant for restricted hazardous substances

RS PRO


RS PRO is our own brand range and brings you a wide range of high-quality, great value products offering you more choice. Trusted by engineers all over the world, every part of every RS PRO product has been rigorously tested against demanding industry standards; they’re only given the RS PRO Seal of Approval if we’re confident of their exceptional quality, which means you can be confident too.

Related links