Northern Fasteners
M10 Square Plate Washers BZP | 40x40x3mm | Load Spreading Washers | Pack of 100
M10 Square Plate Washers BZP | 40x40x3mm | Load Spreading Washers | Pack of 100
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M10 square plate washers in Bright Zinc Plated (BZP) mild steel, 3mm thick. Square plate washers (also called square load-spreading washers) have a much larger bearing area than standard round washers, making them ideal for use in timber, masonry, and soft materials where a round washer would pull through. Clearance hole 12mm for M10 thread. Pack of 100.
Specifications
- Thread size: M10
- Dimensions: 40mm x 40mm
- Thickness: 3mm
- Hole diameter: 12mm
- Material: mild steel
- Finish: Bright Zinc Plated (BZP)
- Pack quantity: 100
Suitable for
- Timber frame connections
- Masonry fixings
- Cladding and structural panels
- Anywhere load distribution is needed
Frequently asked questions
When should I use a square plate washer instead of a round washer?
Square plate washers spread the bolt load over a larger area, preventing pull-through in soft or porous materials like timber, OSB, concrete block, and brick. For steel-to-steel connections, standard round washers are usually sufficient.
Is there a thicker version?
Yes — we also stock the 5mm thick version for heavier-duty applications. HDG versions are also available for external use.
Do you stock other sizes?
Yes — browse our full square plate washer range and all washers.
Delivery
Dispatched within 1 working day. Free delivery on orders over £60.
Complete your order
Northern Fasteners stocks everything you need for a complete, matched assembly. Always pair your fasteners with the same finish throughout — BZP with BZP, HDG with HDG, A4 stainless with A4 stainless — for consistent corrosion protection and a professional result. Browse our full range of hex nuts, washers, threaded rods, and bolt and nut sets to find everything you need.
BZP, HDG or A4 Stainless — which finish do you need?
Choosing the right finish is just as important as choosing the right size. BZP is ideal for indoor and sheltered use. HDG provides heavy-duty corrosion protection for outdoor, structural, and timber applications. A4 Grade 316 Stainless is the choice for marine, coastal, and chemical environments where no rust is acceptable. Read our guide to help you decide.
Why buy from Northern Fasteners?
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Same-day dispatch
Orders placed before 2pm are dispatched the same working day via tracked courier.
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Free delivery over £60
Free standard UK delivery on all orders over £60. Tracked and reliable.
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DIN & ISO standards
All fasteners are manufactured to DIN and ISO standards. Grade 4.8 and 8.8 as standard.
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Trade & domestic
Competitive pricing for both trade buyers and domestic projects. No minimum order.
Free delivery over £60 — same-day dispatch
Orders placed before 2pm are dispatched the same working day. Spend over £60 and get free standard UK delivery via tracked courier. All our fasteners are manufactured to DIN and ISO standards — properly graded, reliably finished, and competitively priced for trade and domestic buyers alike.
Also need mild steel?
We stock a full range of structural mild steel sections alongside our fasteners — angle iron, box section, flat bar, tube, round bar, and more. Whether you're building a gate, a frame, or a fabrication project, we have the steel and the fasteners to go with it, all in one order.