36 Bisset Road, Hughes X7, Jet Park, Boksburg

Head sits above surface

For fasteners where the head usually sits above the surface, the measurement is from directly under the head to the end of the fastener.

Countersunk

For fasteners that are designed to be countersunk, the measurement is made from the point on the head where the surface of the material is, to the end of the fastener.

Hex bolts are measured from under the head to the tip of the bolt.

Wood screw measurement depends upon the type of screw you are using.

Countersunk (Flat head) are measured overall.

Countersunk (Oval head) are measured overall.

Round head screws are measured from under the head.

Machine screw measurement depends on the style of head it has.

Countersunk (Flat head) is measured overall.

Countersunk (Oval head) is measured overall.

Pan Head screws are measured from under the head.

Round Head screws are measured from under the head.

Carriage bolts are measured from directly under the head.

Lag Bolts are measured from under the head.

Sheet metal screw measurement depends upon the type of screw you are using.

Countersunk screws (Flat) are measured by overall length.

Countersunk screws (Oval head) are measured by overall length.

Pan Head and truss head screws are measured from under the head.

Hex Head screws are measured from under the head.

Socket screw measurement depends upon the type of screw you are using.

Flat Socket Caps are measured by the overall length.

Socket Head Caps are measured from under the head.

Button Head Caps are measured from under the head.

Eye Bolts are measured from under the eye.

Hanger bolt length is measured from end to end.

Shoulder bolt length is measured as the lenght of the shoulder.

Sex bolt length is measured from under the head.