How are hex bolt heads measured?

Hex bolts are measured from under the head to the tip of the bolt. Lag Bolts are measured from under the head. Wood screw measurement depends upon the type of screw you are using. Countersunk (Flat or Oval head) are measured overall.

How are hex nut sizes measured?

Hex nut size refers to its nominal thread diameter. Typically, sizes range from 1/4″ to about 2 1/2″. Size is specified in inches, usually fractional rather than decimal. Table 1 lists width across flats and across corners, and thickness.

What size is a hex head?

Hex Bolt Head Size Chart

Diameter Head Size
9/16″ 13/16″
5/8″ 15/16″
3/4″ 1 1/8″
7/8″ 1 5/16″

How do you measure a head bolt?

As a general rule, the length of fasteners is measured from the surface of the material, to the end of the fastener. For fasteners where the head usually sits above the surface such as hex bolts and pan head screws, the measurement is from directly under the head to the end of the fastener.

What size is a #12 hex head?

Hex Bolt, Lag Bolt, Square Bolt and Heavy Hex Bolt

IT IS INTERESTING:  You asked: What is spanner how does it operate?
US Bolts
Bolt Diameter (in) Head and Wrench Size (in)
#12 5/16
1/4 7/16 or 3/8
5/16 1/2

How are nuts and bolts measured?

Bolts are measured in length of shank, bolt head size, width of shank (the diameter of the threaded bolt body) and the thread pitch (the size of the thread). Nuts are measured by the width of the hex shape and by their thread pitch. … Most nut and bolt measurements come in either metric sizing or standard sizing.

How do you calculate nut size?

Multiply the first number which is the bolt size in inches or millimeters, by 1.5 using a pocket calculator, if necessary. 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.

How do you measure bolt socket size?


  1. Insert the shank of the bolt into the holes in a bolt-sizing gauge. …
  2. Locate the printed bolt size to the side of the correct hole on the gauge (for example, 1/2, 3/4 or in mm for metric bolts).
  3. Locate the socket head in the socket set that has this size printed on its side.

What is a hex bolt?

Hex bolts, or hex cap screws, are large bolts with a six-sided head (hexagonal!) used to fasten wood to wood, or metal to wood. … Wood screws have many different types of heads, but the most common are round heads and flat heads.

How do you tell the grade of a bolt?

You can usually figure out the grade, or strength, of a bolt by looking at the markings on its head. English bolts (U.S.S. or S.A.E) are categorized by grade, from grade 2 to grade 8, where the grade represents inch strength. The higher the grade, the stronger the bolt.

IT IS INTERESTING:  How far apart do you put screws in plasterboard?

Does bolt length include the head?

Does the length measurement of a bolt include the head? In most cases, when specifying the length of a headed bolt, the thickness of the bolt head is not included. For instance, if you were to order a ¾” x 24” hex head bolt, the bolt would measure 24” from under the head.

What size bolt fits a 12mm socket?

Size Chart

Bolt size Size Tolerance
12mm 12.30
5/16″UNF 1/2″ 13.00
M8 13mm 13.30
1/4″BSW 13.64

Is Bolt a specification 1367?

The IS 1367 Grade 8.8 specification covers carbon steel bolts and studs ranging from M-6 to M-39 diameter. We use high carbon steel material and high alloy steel raw materials to achieve the required properties in this standard.

What size is a #12 bolt?

US Machine Screw Diameters

Size Nominal Thread Diameter
Decimal Nearest Fractional
#8 0.164″ 5/32″
#10 0.190″ 3/16″
#12 0.216″ 7/32″