Bolt Head Size Formula

Bolt diameter mm head wrench size mm ansi iso din.

Bolt head size formula.

If you re making a custom bolt you can specify the head to have whatever manufacturable dimensions or form that you want as determined by the requirements of the application. Print this page. The following table of hex bolt head dimensions was adapted from asme b18 6 7m table 14 dimensions of hex head machine screws this table is used for smaller size hardware. For example for the numbers in step 1 1 2 x 1 5 75 or 3 4 which is the wrench size needed for this standard sized bolt.

Need a bolted joint calculator. Astm a325 structural bolts are designed for steel to steel connections. Hex bolt head dimensions. Where l is the total bolt length and d nom is the nominal bolt diameter.

Body diameter there may be a reasonable swell or fin under the head or die seam on the body not to exceed the basic bolt diameter by the following. Multiply the first number which is the bolt size in inches or millimeters by 1 5 using a pocket calculator if necessary. Us bolt head wrench size. Where e p is the elastic modulus of a part in the grip and l p is the thickness of a part in the grip.

Metric bolt head wrench size. Because they are used in such a specific application they have dimensional characteristics that are unique and limited compared to most other fastener grades. Bolt diameter head and wrench size. Hex bolt lag bolt.

Miscellaneous engineering related topics like beaufort wind scale ce marking drawing standards and more. Lubricated bolts and reduced torque lubrication. 0 030 for sizes up to 1 2 0 050 for sizes 5 8 and 3 4. Cast iron flanges stud reference chart the number diameter and length of studs for cast iron flanges class 125 and 250.

An even more simplified equation for the grip stiffness can be found if it is assumed that the bolt head diameter is 50 percent larger than the bolt nominal diameter i e. If you re making standard size bolt you should look up the standard. This includes stock sizes available in the market place length tolerances short thread lengths and the actual head dimensions are the same. Following formula are used to calculate spanner size for bolt size upto m14 spanner size bolt size 1 5 1 example for m12 bolt spanner size bolt size 1 5 1 12 1 5 1 18 1 19.