US standard screws and specifications

American screw

a. Usually indicated by a number, such as #2-56, #4-40, #6-32, #8-32, #10-24...etc.

b. Or expressed in English

Such as 0.086-56, 0.112-40, 0.138-32, 0.164-32, 0.190-24...etc.

Ex: 632 – 8 – PPB:

Finish Code: Appearance processing specifications

Head Code: Head shape

Drive Code: Head Groove, Feature Model

Length Code: Screw Length

Thread Code: Screw Model

B-1: Thread Code: Screw Model

The general specifications are as follows:

a. #2-56 (0.086-56): 2 to 56 teeth

b #4-40 (0.112-40) : 4 forty teeth

c. #6-32 (0.138-32) : 6 32 teeth

d. #8-32 (0.164-32) : 8 32 teeth

e. #10-24 (0.190-24): 10 times 24 teeth

*** The number of teeth per tooth.***

B-2: Length Code: Screw Length

The length of the US gauge screw must be converted to the metric mm dimension.

Conversion formula: (Length Code / 32) x 25.40 = Metric length mm

B-3, B-4, B-5 ​​: Marking method is the same as metric system.