Stainless Steel Carriage Bolt, Truss Head, 1/2"-13, 3-1/2" Length (Pack of 25)

Carriage Bolts or Carriage Screws have a square neck that keeps them from turning once tightened. Use in square holes for wood-to-wood and wood-to-metal fastening. Length is measured from under the head.Stainless steels are used for their corrosion resistance, high-temperature strength, scaling resistance, and low-temperature toughness. These properties account for their extremely wide use in practically every industry. Austenitic Stainless Steels are alloys of iron and carbon that contain between 16% and 30% Chromium, a maximum of 0.15% carbon, along with Nickel (or Manganese), and other alloying elements. The chromium, which helps develop a passive surface oxide film, provides corrosion resistance in stainless steels. Austenitic Stainless Steels are designated by a 3 digit SAE Stainless Steel Grade beginning with the number 3 (e.g. 304, 316). Another common naming convention for Austenitic Stainless Steels are 18/8, 18/10, 18/0, etc. where the 18 refers to the % of Chromium and 8 to the % of Nickel contained in the material.    Typically found on carriage bolts, the truss head style is a large-diameter round head that can help cover large-diameter clearance holes in sheet metal work and is lower profile than many other round styles. A threaded fastener's size name includes information about the major external diameter, followed by the threads per inch, which indicates if it is coarse or fine. Coarse threads are better when working with brittle materials; they are sturdier and are easier to thread and unthread compared to fine. Coarse threading also allows for thicker coatings and platings.

• Carriage Bolts have a domed head with a square neck to prevent spinning
• Stainless Steel is suitable where formability and cost are important considerations
• Truss head fasteners are low-profile, but have a large diameter head
• Length is measured from under the head
• Coarse threads are better for brittle materials, and will assemble and disassemble more quickly than fine threads