M12 x 37mm Form G Washer – DIN 9021, Bright Zinc Plated

Heavy-duty DIN 9021 Form G flat washers with enlarged outer diameter for superior load distribution under bolts and screws.

Key Benefits & Features

• DIN 9021 Form G design with significantly larger outer diameter than standard washers.
• Bright zinc plated finish provides corrosion and oxidation resistance.
• Thicker profile offers robust support and prevents deformation.
• Metric sizes from M3 to M20 for a wide range of applications.
• Ideal for spreading load and preventing pull-through on soft materials.
• Easy to install; helps prevent leakage and loosening.
• Suitable for indoor and outdoor use due to durable plating.

Use Cases

• Construction and structural joints requiring wide load distribution
• Automotive repairs, including mudguards and bodywork
• Machinery assembly and maintenance
• Furniture and cabinet fitting where softer materials need protection
• DIY projects and general workshop tasks

Variants

• M3 – ID 3.2 mm (0.13"), OD 9 mm (0.35")
• M4 – ID 4.4 mm (0.17"), OD 12 mm (0.47")
• M5 – ID 5.4 mm (0.21"), OD 15 mm (0.59")
• M6 – ID 6.5 mm (0.26"), OD 18 mm (0.71")
• M8 – ID 8.5 mm (0.33"), OD 24 mm (0.94")
• M10 – ID 10.5 mm (0.41"), OD 30 mm (1.18")
• M12 – ID 13 mm (0.51"), OD 34 mm (1.34")
• M14 – ID 15 mm (0.59"), OD 44 mm (1.73")
• M16 – ID 17 mm (0.67"), OD 50 mm (1.97")
• M18 – ID 19 mm (0.75"), OD 56 mm (2.20")

Compatibility / Fittings

• Works with metric bolts and screws of the same nominal size.
• Suitable for use with nuts or threaded inserts where a large bearing surface is required.
• Can be used alongside spring washers or lock washers for added security.

Installation & Tips

• Choose a washer with the same M size as your bolt or screw for a proper fit.
• Ensure the washer’s outer diameter covers the hole and spreads the load on softer materials.
• Use larger sizes for damaged or oversized holes to reinforce and prevent pull-through.
• Tighten bolts evenly to avoid bending or deforming the washer.
• For long-term outdoor use, consider additional protective coatings if the environment is particularly harsh.