Which bolt size is this washer suitable for?

This washer is suitable for M8 bolts and threaded rods, with an internal diameter of 8.4 mm.

What are the exact dimensions of this washer?

The washer has an inside diameter of 8.4 mm, an outside diameter of 40 mm, and a thickness of 3 mm.

What material is this washer made of?

It is made of steel and is electro-galvanised for corrosion protection.

What is the primary purpose of this wide washer?

It distributes clamping loads across connections in channel and installation systems.

Is this washer suitable for outdoor use?

No, due to the zinc electroplating, it is designed for use in dry indoor environments.

FISCHER 79729 washer U 8 x 40

Name: FISCHER 79729 washer U 8 x 40
Brand: FISCHER
SKU: 02062543
Price: 0.17 EUR
Availability: PreOrder

Supplier number: FISCHER 79729 | EAN 4006209797297

0.17 tax incl.

€0.14 excl. VAT (incl. all environmental contributions)

On order: delivered from 14/10/2026

The minimum purchase order quantity for the product is 100.

Delivery by DHL

✆ Talk to a specialist

Stable load distribution with Fischer Samontec

Practical benefits

Wide surface pressure distribution: The 40 mm outer diameter allows you to distribute clamping force evenly across mounting surfaces.
Precise fit for M8: Designed with an 8.4 mm inner diameter, it fits your M8 bolts and threaded rods securely.
Reliable corrosion resistance: The zinc-plated steel construction protects your indoor installation assemblies from everyday wear and corrosion.

In a nutshell

The right choise for

Achieve firm and dependable joints in your installation setups with the Fischer Samontec washer u 8X40. Featuring a wide 40 mm outer diameter and a solid 3 mm thickness, it distributes clamping pressure evenly across mounting surfaces to prevent M8 bolt heads and nuts from pulling through oversized channel holes or slots. Its 8.4 mm inner diameter fits M8 threaded rods and bolts seamlessly, making it ideal for securing channels, cable trays, and piping. Made from electro-galvanised steel, this washer delivers reliable corrosion protection for everyday indoor installations.

Product information FAQ

€0.17

tax incl.

Key features according to our expert

Outer diameter: 40 mm
Thickness: 3 mm
For bolt: M8
Inner diameter: 8,4 mm

Product description

Washer for fischer installation system.

The fischer washer U is a mounting element for the fischer installation system. The washer is produced from high-quality steel and zinc-plated in lie with DIN EN 10139.

Made of zinc-galvanised steel
Universal use

Application

For use in dry interior areas
For indoor and outdoor application
For indoor and outdoor applications and in environments with high stress to components due to corrosion

All Features

Outer diameter: 40 mm
Thickness: 3 mm
For bolt: M8
Inner diameter: 8,4 mm
Material: electrolytically galvanised steel
Hole diameter: 8.4 mm

Brand FISCHER
02062543
EAN 4006209797297
Supplier number FISCHER 79729

Frequently asked questions about this product

Answered by specialists

Which bolt size is this washer suitable for?: This washer is suitable for M8 bolts and threaded rods, with an internal diameter of 8.4 mm.
What are the exact dimensions of this washer?: The washer has an inside diameter of 8.4 mm, an outside diameter of 40 mm, and a thickness of 3 mm.
What material is this washer made of?: It is made of steel and is electro-galvanised for corrosion protection.
What is the primary purpose of this wide washer?: It distributes clamping loads across connections in channel and installation systems.
Is this washer suitable for outdoor use?: No, due to the zinc electroplating, it is designed for use in dry indoor environments.