1/2" x 13 TPI UNC Coarse Cup Head Coach Bolt Stainless A2-70 G304 ANSI B18.5 / A2

Cup Head Coach Carriage Bolts are used to attach wood to wood or steel with a matching nut to clamp the materials together. The coach bolt has a low profile domed head and a square section under the head which resists turning when the nut is tightened or removed. The square section pulls into the wood as the nut on the other end is tightened, thus eliminating the need for a second spanner. Used to support structure, in timber framing, outdoor furniture, fencing and retaining walls, a common example is the seat and back slats of your garden bench and table furniture
Material / Coating: Stainless Steel A2-70 G304 is the most popular grade of stainless steel. It is aesthetically pleasing to the eye and very practical because of its excellent corrosion protection in most environments. Most products can be identified by the following markings: A2, A2-70, 304 or G304. Stainless steels are largely non-magnetic but it is common for stainless steel fasteners to show a small degree of magnetism which is a result of work-hardening during the manufacturing process. Some of our stock have a smooth finish with no head markings if required, Test Certificates or Certificate of Conformity can be requested
Grade v Class Difference: Metric fastenings are referred to as classes and imperial as grade. Both generally have head markings to determine grade and class. The markings on a stainless fastener indicate the grade of material and strength, e.g. material G304 grade will have one of the following markings: A2-70, G304, A2, 304 and G316 grade stainless will have one of the following: A4-70, G316, A4, 316. Some sizes do not have head markings, we have no control of this as it depends on the stock available at the time
Thread Pitch (Imperial): TPI stands for “threads per inch” which literally means the number of threads within each inch on a screw, a bolt, or a fastener. To determine the TPI of a screw, you simply count the number of threads contained within an inch of length. If the screw is less than an inch count upto ½” and x by 2
Fastener Length: Is generally measured from the point where the surface of the material will be when the fastener is installed to the end of the fastener. Thus, fasteners with heads that sit above the surface are measured from under the head to the end of the fastener, while fasteners that sit flush with the surface are measured from the top of the head to the end of the fastener
Measurements: Every effort has been made to ensure all measurements on our site are accurate and to the relevant standard, they should only be used as a guide. If you see a problem with our specifications please contact us
Dimensions: Our stock is sourced from various suppliers, therefore differences may exist between batches such as height, width, visible stamped markings, thread length, appearance or actual finish
Photos: are of the product but may not be the actual diameter, height, width, length you may require, always refer to the size in the description and additional specifications data provided prior to ordering
Disclaimer: Technical data and specifications were researched and compiled from numerous industry sources for the sole purpose of providing basic information. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person, and Bolt and Nut Australia is not responsible for any loss, claim or damages arising therefrom. In developing this information, Bolt and Nut Australia has made a determined effort to present it accurately
Updating our site: If you see any problems with any of our specifications or you require additional information please contact us
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More Information
System of Measurement	Imperial
Product	Cup Head Bolt Only
Head Type	Cup Head
Size	1/2"
Size & Thread Pitch	1/2" x 13 TPI UNC
Thread Pitch	13 TPI
Thread Direction	Right Hand
Thread Type	UNC / BSW - Coarse
Corrosion Protection Level	Excellent
Class / Grade	A2-70 G304
Material	Stainless Steel
Length (l)	Select from the dropdown
Thread Length (t)	Choose your length to view
Product Diameter (d)	0.493 - 0.500" (12.53 - 12.70mm)
Head Diameter (a)	1.032 - 1.094" (26.21 - 27.79mm)
Head Height (h)	0.250 - 0.270" (6.35 - 6.86mm)
Square Under Head Width (as)	0.492 - 0.515"
Square Under Head Height (s)	0.250 - 0.281"
Closest size in mm	M12 (12mm)
Standard Made To	ANSI B18.5 / A2
Brand	Hobson Engineering