Screw is the use of objects of the circular circular rotation and friction of the physical and mathematical principles, step by step to fasten the tools of the tools. Drilling screw is the screw at the front of the screw with self-tapping head. Screw is thousands of years of people's production and life in the common invention, according to the application field, it is the first major inventions of mankind. Drilling screw is a new invention in recent years, also known as self-tapping screws. The screw is the general saying of the fastener, the daily oral language.
The tail of the drilling screw is tail or tail tip, without auxiliary processing, can be directly in the installation of materials, basic materials, drilling, tapping, locking, substantial savings in construction time. Comparison of ordinary screws, its toughness and maintain the high strength, the combination of a long time will not loose, the use of safe drilling tapping once completed simple operation.
Uses: It is a kind of wood screws, mainly used in the steel structure of the color steel tile fixed can also be used for simple construction of thin plate fixed. It can not be used for metal and metal bonding
Material is iron, stainless steel two kinds of stainless steel which is divided into a variety of materials.
Model: Φ4.2 / Φ4.8 / Φ5.5 / Φ6.3mm, the specific length can be agreed upon on request.
According to different drilling tail can be divided into:
Round head / cross / plum, countersunk head (flat head) / rice / cross / plum, hexagonal Division, round head Division (large flat head), horn head
1, the heart hardness: standard: HRC32-40 The company's products measured HRC31.7-39.0.
2, the surface hardness: Standard: HV600-700 The company's products measured for HV620 or so.
3, infiltration layer: 4 # -6 #: 0.05-0.18mm 8 # -12 #: 0.10-0.23mm 14 #: 0.15-0.28mm
4, torque: size, drilling, screw, TYPE BSDTYPE CSDINCH-LBKG-CMINCH-LBKG-CM4 # (2.9) 141614166 # (3.5) 242824288 # (4.2) 4248485510 # (4.8) 6170657512 # (5.5) 9210610011514 # ) 150173156180.