Master Grippers MDP® Master Tappers® Master Drillers® Master Drillers® Plymetal Master Nylon Headed® Machine Screws Master Purlin/Girt Bolts Girt Safety Spacer Nut Fin Neck Locking Bolts A-325 Heavy Hex Structural Bolts Capscrews Nuts & Washers Master Flash® Closure/Venting Tube Caulking & Butyl Tape Master Surface Drive Bits® Stainless Steel Guidelines (PDF) How to Specify Fasteners (PDF) Stainless Steel Guidelines (PDF) NUTS & WASHERS Finished Hex Nuts Heavy Hex Nuts Plain Flange Nuts Hex Nuts Serrated Both Sides Serrated Flange Nuts Regular & Heavy Square Nuts Flat & S.A.E. Washers Spring Lock Washers NUTS & WASHERS STANDARD NUTS & WASHERS AVAILABLE IN TYPES & SIZES INDICATED