# Screw / Tapping
# ANSI/ASME, DIN, GB, ISO, JIS
Countersunk screws are small screws with a flat head and a conical seating surface, designed so that the head is flush with the material when fastened.
They are primarily used when the screw head should not protrude or when a flat fastening surface is desired.
*Applicable Standards：
JIS B 1111 Annex JA, ISO 7046, GB 819, DIN 965, ANSI B 18.6.3F
*Reference：
The outer diameter of the countersunk head of a JIS countersunk screw is twice the screw diameter.
Available Materials
Available Surface Treatments
