drywall screw chipboard screw self drilling screw

Drywall screw Diameter: 3.5mm(#6),3.9mm(#7),4.2mm(#8),4.8mm(#10) ,5.5mm(#14)Length: From 13mm to 254mm Or From 3/4" to 10"Material: C1022Coating: Black Phosphated,Grey Phosphated,Zinc,Yellow Zinc,Nickel plated,others. We are a large manufacturer of screws in China. Our main screws includes: self tapping screw, self drilling screw, drywall screw, chipboard screw, and so on. We can supply different sizes and different standard, and can produce as customer's request. If any interests you hv, kindly contact me freely , we are glad to give you our best current price. Thanks! Drywall screws are case hardened and are designed with metal piercing points and bugle shaped Philips head which ingeniously and securely fastens drywall to metal stud work without the head pulling thought the paper surface of the drywall.According to the difference of the thread, drywall screws are be divided to drywall screws fine thread and drywall screws coarse thread. Fine thread screws are mainly used for drywall and general interior applications. Coarse thread screws are for general purpose interior wood applications. Another similar screw is drywall screws self-drilling point. They are used to attach drywall to heavy gauge metal 20-14 gauge.In many cases, drywall screws provide the kind of torque that will make certain kinds of clamping operations unnecessary. In addition to eliminating some clamping, the creative use of drywall screws can many times eliminate the need for complicated, time consuming and sometimes expensive joinery systems like dovetailing, dowelling and other traditional methods.Self-drilling screws mainly has three advantages as following:Firstly, Self-drilling screws can save labor. Drilling hole, forming mating thread and clamping home can achieve in an easy operation. It doesnt require for difficult alignment of two or more elements.Secondly, self-drilling screws can save materials. It only needs one tool for application---screw drive. Power drills, drill bits and elaborate and costly press tools and their maintenance are eliminated.Finally, self-drilling screws can improve product quality. It ensures correct hole size every time, resulting in better thread engagement and tighter clampChipboard screws are one type of important screws we are manufacturing. Among the products we are supplying in stock, Chipboard screws are classified to countersunk head and pan head according to the difference of the head; chipboard screws are divided to pozi drive and torx drive based on the drive type. Countersunk head screws can be divided to countersunk head and double countersunk head. Self-tapping screws provide an economical means of assembling components. Self-tapping screws offer a particular advantage where occasional disassembly may be necessary for maintenance or repair.Our range of small sel- tapping screws are intended for small fixing applications into hard woods, soft woods, plywood, composite boards, soft plastics and so on.A self-tapping screw fastener includes a shank having first and second ends and a head disposed at the second end of the shank. The shank of the self-tapping has a tapered portion of a predetermined axial length adjacent the first end, and the tapered portion terminates at the first end in a substantially circular end surface having a first diameter.The shank also has a substantially cylindrical portion having a second diameter extending from the second end to the tapered portion. A thread extends helically along a circumferential outer surface of the shank from a location near the head substantially to the first end such that the thread at least partially covers the cylindrical and tapered portions of the shank. The ratio of the axial length of the tapered portion to the diameter of the end surface exceeds substantially 1.5, and the diameter of the end surface is less than but substantially equal to the diameter of the cylindrical portion of the shank.