Penny Washers

Penny washers are a larger diameter washer that offer an extremely secure surface to tighten against by spreading the load with an increased surface area across the material.

They are used to prevent pull through or damage to the product when being secured, a must have washer when fastening soft materials/timber.

Often referred to as repair washers or mudguard washers as they are extensively used within the automotive industry on mudguards to prevent the small bolt heads pulling through the rubber material.

Available in sizes to fit screws/bolts from M3 to M12 with an outside diameter ranging from 9mm - 40mm. Our full range can be seen in the below table with dimensions. Our range can be seen here; Penny Washers.

What are penny washers used for?

Penny washers are also referred to quite commonly as repair washers due to the common application they are used for. Penny washers are a brilliant solution to preventing damage to soft materials or timber when securing them in position, but unfortunately penny washers are commonly used in hindsight !!

The main issue with securing softer materials is the bolt heads and standard washers are often quite narrow in diameter, with the majority of pressure at the point bolt head or washer this forms a weak point in the material and the fastener can damage the material where it makes contact, often ending in the fastener pulling fully through the hole and leaving no security at that point. You are then left with a frayed, damaged or bigger hole. 

This is where repair washers get there name, as people research a solution they come across penny washers which have the same inner diameter for the screw or bolt, but an increased outer diameter to give more surface area and cover the damaged section. This washer then provides a much more longer lasting solution.

The automotive industry is well aware of the benefits of penny washers and refer to them themselves as mudguard washers as they use them to secure mudguards on vehicles due to the rubber material they are manufactured from being a prime candidate for pull through of the fastener. Penny washers are fitted in retrospect to ensure a reliable, secure mudguard from install.

What size penny washer do I need?

Measuring up for penny washers is an easy task which requires two quick steps, simply put you need to ensure the inner diameter is large enough for the bolt or screw being used and the outer diameter covers the hole you are inserting in to.

1. Check what diameter screw or bolt you are using. M4 Bolts or Screws require an M4 washer, M8 Bolts or Screws require and M8 washer and so on.

2. Check the size of the hole being secured and the area around it. Firstly ensure the hole is fully covered, then if space allows, a heavier or more secure fixing is required, then the larger diameter washer used the more the load weight is spread and the better chance of a long lasting fastening solution.

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