As a fastener manufacturer, it is very important to know the common model parameters of special custom screw fasteners. However, many friends still can not completely grasp it. So I will analyze it today. Common model parameters of special custom screw fasteners are as follows:
1. Head type of special custom screw
B: spherical cylinder head
C: cylinder head
F (K) : countersunk head
H: hexagon head
HW: hexagon head with washer
O: oval head
P: flat head
R: half round head
PW: flat head with washer
T: large flat head
V: mushroom head
2. Heat treatment
H：Heat treatment
N: No heat treatment
3. Surface treatment
Zn：white zinc
C：Color-Zinc
B: blue zinc
F: black zinc
O: oxidation of black
Ni: nickel
P: phosphorization
4. Thread type of special custom screw
A: tapping pointed tail (the first kind of Japanese standard), sparse.
AB: tapping pointed tail (the fourth kind of Japanese standard), dense.
B: tapping flat tail (the second kind of Japanese standard), sparse.
C: tapping flat tail (the third kind of Japanese standard), dense.
P: double wire tooth
HL: high and low tooth
U: pineapple tooth tattoo
T: tapping flat tail cut feet
AT:self tapping pointed tail cut feet
M: mechanical tooth
Special custom screw fasteners are very common in our daily life. I hope this article can be helpful to you.