610 assorted red fibre washers across 8 sizes, from 13/64″ up to 49/64″. Packed in a splash-proof, stackable compartment case. Covers the sizes you actually need for maintenance, repair, and general trade work.
A fibre washer kit sounds like the sort of thing you only think about when you’re halfway through a job and one is missing. This assorted kit takes that particular frustration off the table. 610 red fibre washers, 8 sizes, one neat case — sorted. Sizes run from 13/64″ up to 49/64″, which covers the bulk of general fixing, plumbing, and mechanical work where a fibre washer is the right call.
Fibre washers do a specific job. They compress under load to create a seal, absorb vibration, and protect softer surfaces from the bite of a metal fastener. They’re used wherever a standard metal washer would cause damage, contamination, or an inadequate seal. Fuel fittings, radiator valves, tap bodies, compression joints, electrical terminals — fibre washers turn up in a lot of places. Having a proper range on hand means you’re not hunting through a jar of mixed odds and ends every time one is needed.
What’s in the Fibre Washer Kit
The kit contains 610 pieces split across eight sizes. Smaller sizes have higher quantities because they’re used more often — sensible distribution rather than equal splits that leave you short of the common sizes first. Here’s the full breakdown: 13/64″ x 3/8″ (110 pieces), 1/4″ x 3/8″ (100), 3/8″ x 5/8″ (100), 13/32″ x 5/8″ (100), 29/64″ x 11/16″ (60), 1/2″ x 3/4″ (50), 5/8″ x 7/8″ (50), 49/64″ x 15/16″ (40).
The case is a Kit-Master compartment box — each size has its own section so you’re not rooting around. It’s splash-proof, which matters if it’s living in the back of a van or a site bag, and the cases stack cleanly if you run multiple kits. Straightforward to carry, straightforward to use.
Red Fibre Construction
These are self-colour red fibre washers, the standard material for general sealing and insulating applications. Red fibre compresses reliably without crumbling, holds up to light fluid contact, and works across a wide temperature range for everyday use. It’s not the material you’d specify for high-pressure hydraulics or extreme heat, but for the vast majority of maintenance and repair tasks it does exactly what it needs to.
Whether it’s a tradesperson restocking the van kit, someone doing a proper job on a home plumbing repair, or a workshop keeping general fixings topped up, this fibre washer kit covers the bases without requiring six separate orders.
Pro Tip: Keep the case oriented the same way every time you open it so muscle memory takes you straight to the size you need, useful when you're working blind in a tight space and don't want to tip the whole lot.
Fibre washers are used across plumbing, heating, automotive, and general mechanical maintenance wherever a soft, compressible washer is needed to form a seal or protect a surface. Common jobs include seating compression fittings, sealing radiator valves, gland nuts on tap bodies, and oil drain plugs. The assorted range in this kit suits tradespeople carrying a general toolkit as well as workshops and maintenance teams who get through mixed sizes regularly.
Best For
Plumbing compression fittings
Radiator valve sealing
Tap body gland nuts
Oil drain plug sealing
Electrical terminal insulation
General maintenance and repair
Light mechanical assembly
Available Sizes
13/64" x 3/8"
1/4" x 3/8"
3/8" x 5/8"
13/32" x 5/8"
29/64" x 11/16"
1/2" x 3/4"
5/8" x 7/8"
49/64" x 15/16"
Key Features
610 pieces total
8 assorted sizes
Self-colour red fibre construction
Splash-proof compartment case
Stackable Kit-Master case
Individual compartments per size
Suitable for van, site, or workshop
Not suitable for: Not suitable for high-pressure hydraulic systems or sustained high-temperature applications where specialist gasket materials are required. These are general-purpose fibre washers, not rated sealing components.
Select the correct size washer for your fitting before assembly. The washer should sit flat against the mating face with the fastener passing cleanly through the centre hole. Tighten to hand-tight first, then apply a controlled final torque with a spanner — fibre compresses to form the seal, so overtightening can split or distort the washer and undo your work.
For plumbing applications, the fitting does not usually need thread sealant as well as a fibre washer — one or the other, depending on joint type. Replace any washer that shows cracking, deformation, or signs of previous compression rather than reusing it.
Select the washer size that matches your fitting — the outer diameter should seat cleanly against the mating face without overhang.
Check the washer is undamaged and flat before fitting — do not reuse washers that are cracked or visibly compressed from previous use.
Place the washer onto the fastener or into the fitting recess before assembly.
Hand-tighten the fitting first to seat the washer evenly.
Apply final tightening with a spanner — firm and controlled, not forced. Fibre compresses as it seals.
Check for leaks or movement after the first use cycle and retighten slightly if needed.
Are these suitable for plumbing and water fittings?
Yes, red fibre washers are commonly used in plumbing for compression fittings, tap gland nuts, and radiator valve seats. They compress to form a seal under load. They are not rated for high-pressure or potable water systems where WRAS-approved materials are specifically required, so check your installation requirements if that applies.
How are the washers organised in the case?
Each of the eight sizes has its own compartment in the Kit-Master case, so you can see at a glance what you have and pick the right size without emptying the lot. The case is splash-proof and designed to stack with other Kit-Master boxes if you run multiple assortment kits.
Red fibre washers are made from compressed fibre board, a material that offers controlled compressibility, basic fluid resistance, and electrical insulation properties. The self-colour red finish is standard for this grade. These washers perform reliably across typical ambient temperatures encountered in plumbing and light mechanical work, and are compatible with water, light oils, and general fastening applications.
Total Pieces
610
Number of Sizes
8
Size Range
13/64" to 49/64" (inner diameter)
Material
Red fibre
Colour
Red (self-colour)
Case Type
Kit-Master splash-proof compartment case
SKU
FWP
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