Square plate Round hole washers M10 x 50

Square Plate Round Hole Washers M10 x 50 by Owlett Jaton (Hexstone Limited) are heavy-duty mild steel load-spreading washers designed for M10 threaded fixings. With a 50 mm × 50 mm plate and a 3 mm thickness, these square plate washers deliver a significantly larger bearing surface than standard round washers, preventing pull-through and surface deformation in structural and timber applications. Trusted by UK tradespeople and builders’ merchants alike, Owlett Jaton fixings are a reliable choice for both site and workshop use.

Key Features and Specifications

• Nominal thread size: M10
• Plate dimensions: 50 mm × 50 mm
• Thickness: 3.0 mm
• Internal (hole) diameter: 11 mm clearance hole for M10 bolts
• Material: Mild steel
• Finish options: Bright Zinc Plated (BZP) for corrosion resistance; Self-Colour (S/Col) for uncoated applications
• Square plate profile: Maximises bearing area and edge contact under tightening torque
• Brand: Owlett Jaton (Hexstone Limited) — part number OJ426181 (BZP)
• Available in: Small packs and trade boxes of 100

Applications

• Timber construction: Used under bolt heads and nuts with coach bolts and threaded rod to spread load across joists, beams, and structural frames
• Wall fixings: Ideal for bolting through masonry walls, preventing pull-through on the bearing face
• Roofing and decking: Distributes fixing tension across sheet materials and decking boards
• Fencing and gate installation: Commonly used with concrete repair spurs and chain-link fencing posts
• Steel fabrication: Fitted under nuts or bolt heads in medium-duty structural joints and Unistrut channel assemblies
• Concrete anchoring: Provides a firm seating for expansion bolts and through-bolts in concrete substrates

Why Choose This Product

Owlett Jaton Square Plate Round Hole Washers M10 x 50 are a go-to specification item for UK contractors and DIY builders who need a dependable, correctly dimensioned load spreader. The BZP finish provides everyday corrosion resistance suitable for internal and sheltered external use, while the self-colour option suits applications where a secondary coating will be applied. Trade box quantities of 100 keep site costs low, and the consistent mild steel construction ensures uniform performance across every washer in the batch.

Delivery in and Around London

We deliver Square Plate Round Hole Washers M10 x 50 across London and the surrounding region, including inner boroughs such as Croydon, Lewisham, Southwark, Camden, and Hackney, as well as Greater London areas including Enfield, Bexley, Redbridge, and Barnet. We also supply trade customers throughout Kent, Essex, Surrey, and Hertfordshire. Trade quantities are welcome — contact us for volume pricing and scheduled delivery options.