Flat Square Washer A4 (316) 50 x 50 x 4 M10

This A4 (316) marine-grade stainless steel flat square washer spreads load over timber or soft substrates under a bolted joint, covering M10 to M24 bolt sizes across a range of square dimensions and thicknesses.

The larger, flat bearing area outperforms a round washer of the same bolt size where the substrate is softer or less consistent, holding up to corrosion in outdoor timber fixings and construction work.

At a glance

• Timber fencing & decking — spreads load over timber posts and rails without crushing the surface
• Landscaping fixings — corrosion-resistant washer for outdoor structural timber work
• General construction — larger bearing area than a round washer of the same bolt size

Full specifications, applications and features are in the tabs below.