How do bolt sizes work

Sex bolt The sex bolt, also known as a barrel bolt, connector bolt, or binding barrel, is a type of mating fastener combining a nut and a screw, it consists of a barrel with internal threads and a screw with external threads, both the barrel and screw have heads designed to clamp material between the head of the barrel and the head of the screw.

Some sex bolts have knurled barrels to allow one-sided assembly. Mating fasteners are known by many other different names. Hanger bolt Hanger bolts are headless bolts with threads on both ends, used to suspend objects from or attach items to wood, it will add an external thread or create a hidden fastening joint.

Hanger bolts feature one side with a self-tapping lag screw thread to grip into the wood, with the other end having machine screw threads to accept a nut or thread into an internally tapped hole. Flange bolt The flange bolt has a circular flange under the head that acts like a washer to distribute the load. The ridge surrounding their heads also makes them easy to be identified.

Flange bolts feature a nozzle, thereby speeding the assembly while eliminating the washer. They can ensure a reliable, long-lasting connection between two sections of a large and enclosed area.

The popular use of flange bolts including car exhaust, Plumbing, electronic devices, and hard-to-reach applications. There are also machine bolts with a fully threaded shaft and a semi-cone point, used to fasten wood to wood, wood to metal, and metal to metal. Its point will not be chamfered or rounded.

Machine bolts can be divided into hex bolts and square bolts based on the head type. The size of a metric bolt is specified using pitch, diameter, and length in millimeters.

For example, in M Sometimes, the pitch is omitted in the abbreviated format, such as M, this means the bolt has a coarse thread. The bolt dimension can also be expressed in imperial units. Diameter : the width of the bolt shank, the bolt head is not included. The defined diameter of metric bolts is actually slightly larger than the actual diameter.

Metric bolts are available with either coarse or fine thread pitches. Metric bolts with a coarse thread pitch have more threads per inch than comparable imperial bolts. Length : for socket head, pan head, button head, and hex head bolts, the length measurement from the chamfered edge to the undercut of the head, and the bolt head is not included.

But for flat head bolts, the length includes the height of the bolt head and for dome head bolts the length is measured from the highest point on the curved head. The following table provides examples of clearance hole sizes, standard or coarse thread pitches along with fine thread pitches and their corresponding tapping hole sizes. Using the correct tool for the job is always essential.

If you have any questions or uncertainty regarding the fasteners you need then remember that we are here to help. So buy now with confidence - and join the thousands of happy customers we have helped over the last 20 years Just call us on Web Design by Worldwide Webdesign. Need Help or Advice? Call the Insight team Can't see what you want or need help?

Call us on Reg: Vat no: GB It's easy to order from us and we're easy to contact All our products are very competitively priced Hints and Tips to make you safer. November 2 posts. October 4 posts. September 5 posts. August 4 posts. July 5 posts. June 4 posts. May 4 posts. April 5 posts. All of these are measured from the bottom of the head to the tip. Flat head, countersunk screws are flat on the top of the head.

They are measured from the top of the head to the tip. Hex and hex washer head screws and bolts, although flat on the top and the bottom, are measured from the bottom of the head. Oval head screws are an exception to the rule. The starting point for their length is at the widest point of the head. From that point to the tip is the length of the screw.

Self drilling screws are measured all the way to the end of the drill point tip. If you have questions about the screw size you need, contact the Fastener SuperStore at , or via online chat at www.