xingfeng screw galvanized self-drilling screw coiled hair self-countersunk head flat head coiled hair round head washer drill tail

a: metric screw b: american standard screw c: british screw

a: metric mechanical screw: metric

ex: m3 x 6-p p b : m3 mechanical screw, 6mm long, cross, round flat head, black plated.

finish code: finish code

head code: head code.

screw head shape. cylindrical head. half countersunk head. countersunk head. spherical cylindrical head. coiled hair. semicircle head. hex hd.

thread code

screw model drive code: head ditch, feature model

length code: length code (mm)

a- 1: thread code: screw model

metric screws directly mark the screw model with the outer diameter of the screw,

for example, m3 means that the outer diameter of the screw is mm. m4 means that the outer diameter of the screw is mm.

metric thread size x pitch:

note: the metric screw is behind the screw model, and sometimes the screw tooth distance is indicated.

for example, m3x0.5,m4x0.70,m5x0.8,m6x1.

however, due to standard specifications, it is usually not mentioned.

a- 2: length code: length code:

metric screw, directly marked length code, unit: mm.

the total length of the screw is marked. only the length below the head is calculated, excluding the head height.

except for flat-head screw, the total length of the screws is marked with the head height.

a- 3: drive code/head ditch, features.

a: metric screws b: american screws c: british screws

a: mechanical screws: metric

ex: m3 x 6 -- p p b: m3 mechanical screws, 6mm long, cross, round flat head, plated black.

finish code: appearance processing specification

head code: head appearance.

screw head shape. cylindrical head. half sunk head. heavy head. spherical cylindrical head. do your head up. half round head. hexagonal head.

thread code

drive code: head trench, feature model

length code: screw length (mm)

a- 1: thread code: screw type

for metric screws, the screw type is directly marked with the outside diameter of the screw.

such as m3, the outer diameter of the screw is 3.00mm. m4 means the outer diameter of the screw is 4.00mm.

metric thread size x pitch:

note: metric screws are placed behind the screw type, sometimes the screw spacing is indicated.

such as m3x0. 5, m4x0. 70, m5x0. 8, m6x1.

but because of the standard rules, it's usually not mentioned.

a- 2: length code: screw length:

metric screws, directly marking screw length in mm.

the total length of screws is indicated by counting the length below the head only, excluding the head height.

with the exception of flat head screws, the total length of screws is indicated with head height.

a- 3: drive code/ head trench, features.