5/16-18X3/4 A/F.428-.437 HD Hgt.172-.190 Slotted Indented Hex Washer Serrate Self Drill Full Thread Zinc (Pack Qty 1 000) BC-311207KSWSMS

PICTURES ARE REPRESENTATIVE OF ITEM BUT ARE NOT OF THE ACTUAL ITEM. Product dimensions finish head markings thread length stamping shape or forging shape etc. may differ from picture. Products are guaranteed to meet the specifications to which they are manufactured. Specifications allow for tolerances in dimension and shape which can vary from lot to lot. A hex or round shaped mechanical device which has an opening with a partial internal thread at one end and an externally threaded post at the opposite end. It is used to hold two components at a given distance from each other.. Male-female standoffs are used when one of the components is internally threaded. Aluminum is popular for its light weight/ strength compromise. It is non-magnetic performs well in severe temperatures and has insulating properties. Nylon is a good insulator and has a surface smoothness which will not fray the insulation of wires that rub against it. Its threads will withstand torque without stripping. Brass is used in making high-quality standoffs.. It is conductive resists corrosion and is non-magnetic. It is costlier and heavier than aluminum and is usually plated zinc or nickel. Stainless has the advantages of brass but has superior resistance to corrosion and chemical fumes. Steel is used for its greater strength but it is heavier than aluminum and does not resist corrosion like aluminum or brass.. Aluminum: 2011 Aluminum (Copper: 5.0-6.0%; Silicon: 0.4% maximum; Iron: 0.7% maximum; Zinc: 0.3% maximum; Bismuth: 0.2-0.6%; Lead: 0.2-0.6%) Nylon: Nylon 6/6 Brass: C36000 Brass (Copper: 60.00-63.00%; Lead: 2.50-3.70%; Iron: .35% maximum). Stainless: Type 303 stainless Steel: 12L14 Steel-Leaded Grade A (Carbon: .15% maximum; Manganese: .85-1.15%; Phosphorus: .04-.09%; Sulphur: .26-.35%).