Old General Fastener Information

Finishing :

A low carbon steel for general use. Relatively inexpensive, with zinc plating providing moderate corrosion resistance suitable for indoors or otherwise dry conditions.

Stainless steel 18.8 or A2
Offers good corrosion resistance, making it suitable for outdoor use, but more expensive than zinc plated.

Stainless steel 410
A stainless steel alloy that is harder than 18-8 or A2 stainless steel, but not as resistant to corrosion.

Head Marking Hexagonal Bolt Metric
8.8 is Medium carbon steel, tempered and 12.9 is Alloy steel, tempered.
Stainless steel markings vary. Most stainless steel is non-magnetic. Usually stamped 18.8 or A-2.


Usage :

Hex bolts are used in machinery and construction. Can be used with a nut or in a tapped hole. Hexagonal bolts are fully or partially threaded.

Sheet Metal Screws have tips and threads, and are designed to be driven directly into the sheet. They can also be used with plastic materials, fiberglass or wood.

Machine screws are fully or partially threaded for use with a nut or in a tapped hole.

Socket screws with an Allen key are used for machinery.

Nuts are used to fasten machine threaded fasteners in through-hole applications.

Washers spread the load over a greater surface area when tightening a bolt, screw or nut. Lock washers help prevent loosening.