Self-Tapping Screw for Steel Framed Building

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A self-tapping screw is a threaded fastener that can tap its own hole in metal or non-metallic material as it is driven into it. It has high tensile strength, and is characterized by the single-piece, single-edge combination.

According to the material, there are two common types of the self-tapping series: carbon steel screws and stainless steel screws. The carbon steel type is usually made of 1022 carbon steel. One should note that it is different from the self-drilling screw.

Self-Tapping Screw for Steel Framed Building

Categories
1. Head types: round head, flat head (countersunk), dome head, oval head, pan head, flanged-hex head, hex head.
2. Groove types: slot, cross, cross-slot, pozi.
3. Standards: GB, DIN, ANSI, BS.

Specifications of Phillips Countersunk Head Self-tapping Screw
1. Standard: Phillips, GB845-85, GB846-85, GB847-85, JIS1122
2. Material: stainless steel, carburizing steel
3. Surface: galvanized

GB846-85 Phillips Countersunk Head Self-tapping Screw
Material: stainless steel, carburizing steel L<=50mm L>50mm Thread length is in accordance with the agreement
	1. C Type	2. C Type	3. C Type	4. C Type

Thread		ST2.2	ST2.9	ST3.5	ST4.2	ST4.8	ST5.5	ST6.3
dk max		3.8	5.5	7.3	8.4	9.3	10.3	11.3
K max		1.1	1.7	2.35	2.6	2.8	3	3.15
m	H type	1.9	3.2	4.4	4.6	5.2	6.6	6.8
m	Z type	2	3.2	4.3	4.6	5.1	6.5	6.8
Slot Number		0	1	2	2	2	3	3
L		4.5-1.6	6.5-19	9.5-32	13-38	16-45	19-50	22-75