German standard DIN7981 for cross groove pan head tapping screws, corresponding to the national standard GB845 (equivalent to the international standard ISO7049). Tapping screws also known as quick tooth screws, is a kind of steel fastener, used for connection between thin metal plates, Self-tapping screws are generally common steel plate self-tapping nails, self-squeezing self-tapping nails, self-drilling self-tapping nails (drill tail nails) and son on.
Basic supply information
Standard: DIN7981,corresponding to the international standard ISO7049.DIN7981 and ISO7949 have slight differences in the thickness and diameter of the head.
Groove type:H:cross groove Z:rice groove
Tail: C tall vertebra end F tail flat end
Specification: ST2.2- ST6.3, length 1.3-120mm
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