A plain washer is a flat, circular component with a center hole, typically made from steel, stainless steel, or other metals. It is designed to be placed between a fastener (bolt or nut) and the surface to evenly distribute pressure, prevent surface damage, and improve fastening stability. Widely used in construction, machinery, automotive, and general assembly applications.

Material

• Mild Steel (MS)
• Stainless Steel (SS 304 / SS 316)
• Carbon Steel
• Brass / Copper / Nylon (special use)

 Dimensions

• Inner Diameter (ID): As per bolt size (e.g., M3–M72)
• Outer Diameter (OD): Typically 2× bolt diameter (varies by standard)
• Thickness: Depends on load (light to heavy duty)

 Surface Finish

• Zinc Plated (common for construction)
• Hot Dip Galvanized (HDG) – for outdoor use
• Black Oxide
• Natural / Plain finish

 Hardness

• Standard: up to ~200 HV
• Hardened washers: 200–300+ HV for structural applications

 Function / Use (Construction – Marble & Tiles)

• Distributes load of bolt/nut on marble or tile surface
• Prevents cracking or damage to brittle materials
• Provides smooth bearing surface
• Reduces loosening and vibration

 Applications

• Marble and tile fixing systems
• Building construction & structural joints
• Machinery and fittings
• Cladding and façade work

 Special Notes for Marble & Tiles

• Use larger OD washers to avoid tile breakage
• Prefer SS 304/316 or galvanized washers for corrosion resistance
• Thickness should be adequate to prevent bending under load