Star Head Short / Long Polish Self Tapping Screws Framing , Self Cutting Screws Metal

DIN7981 stainless steel cross recessed pan head self tapping screw, sheet metal screw, polish

1. Descriptions:

Sheet metal screws are also the go to fasteners for use with plastic wall anchors in drywall.
Tapping screws are considered externally threaded fasteners that "tap" their own mating threads in metallic and non-metallic (such as plastic) materials.

Tapping screws, especially Type A, are referred to as "sheet metal screws" because one of their first applications was in ventilation ducts made of sheet metal.
They also make excellent fasteners for attaching metal hardware to wood because the fully threaded shank provides good retention in wood.

Pan heads are slightly rounded with short vertical sides. A Pan head provides a low large diameter head, but with characteristically high outer edge along the outer periphery of the head where driving action is most effective for high tightening torques. Phillips drive is x-shaped for installation with a phillip screw driver.

The design is often criticized for its tendency to cam out at lower torque levels than other "cross head" designs. There has long been a popular belief that this was actually a deliberate feature of the design, for the purpose of assembling aluminum aircraft without over tightening the fasteners

2. Specifications:

3. Applications:

DIN 7981 is cross recess pan head self tapping, also can called round head self tapping screw. Self - tapping Screw is in metal or nonmetal material drilled are cooperate with one of the female thread tapping out their kind of threaded fasteners. The Self Tapping Metal Screws are widely uesd in machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, equipment, instruments and so on

4. Drawing Technical Data:

5. Why choose us:

1. Quality control: we make 100% quality test during producing and before shipping

2. Rich experience: we have been export screws for more than 20 years

3. Competitive prices: the better quality, but cheaper prices

4. Timely quotation: send you prices within one day

5. Good services: we supply OEM, ODM,OBM services and best after-sale services

6. Punctual delivery: we can ship every order without delay

6. Pictures for checking:

DIN7981 stainless steel pan head self tapping screws

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