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Sheet Metal Screws

Sheet Metal ScrewsFNL Type A Sheet Metal ScrewsSheet Metal Screws, also known as "Tapping Screws", are designed to bind sheet metal to wood or fiberglass. Constructed with a sharper, more pronounced thread that allows the screw to better penetrate metal surfaces. The Type A point features spaced threads with a gimlet point.

Head - Flat Finish - Zinc

#4 #5 #6 #7 #8 #10 #12 #14 Phillips Slotted Square Phillips Slotted Square Phillips Slotted Square Phillips Slotted Square Phillips Slotted Square

Length Part No. Part No. Part No. Part No. Part No. Part No. Part No. Part No. Part No. Part No. Part No. Part No. Part No. Part No. Part No. Part No. Part No. Part No.3/8" 31502 - 31528 315541/2" 31504 31517 31530 - 30858 0142117 31556 31555 30871 31582 - 30883 31606 - - 31630 - -5/8" 31506 31518 31532 31531 30859 0142118 31558 31557 30872 31584 - 30884 31608 - - 31632 - -3/4" 31508 - 31534 31533 30860 0142119 31560 31559 30873 31586 - 30885 31610 31609 - 31634 31633 -7/8" - - 31536 - - - 31562 - - 31588 - - 31612 - - - - -1" 31512 - 31538 31537 30862 - 31564 31563 30875 31590 31589 30887 31614 - 30899 31638 31637 -1-1/4" - - 31540 31539 30863 - 31566 31565 30876 31592 31591 30888 31616 - 30962 31640 31639 -1-1/2" 31516 - 31542 - 30864 - 31568 31567 30877 31594 31593 30889 31618 31617 30963 31642 31641 309751-3/4" - - 31544 - - - 31570 - 30878 31596 - - 31620 - - 31644 31643 -2" - - 31546 - - - 31572 31571 30879 31598 31597 30891 31622 31621 30965 31646 31645 309772-1/4" - - - - - - 0142122 - - 31603 - - - - - - - -2-1/2" - - 31548 - - - 31574 31573 30881 31600 31599 30893 31624 31623 - 31648 31647 -3" - - 31550 - - - 31576 31575 - 31602 31601 30894 31626 - - 31650 31649 309803-1/2" - - - - - - 0142123 - - 0142124 - - 0142127 - - 0142129 - -4" - - - - - - - - - 0142125 - - 0142128 - - 0142130 - -4-1/2" - - - - - - - - - - - - - - - 0142131 - -5" - - - - - - - - - - - - - - - 0142132 - -

Thread and PoinT STyleS

Screws come in a number of different tread and point styles to fit different needs and applications.

Type A screws feature spaced threads with a gimlet point. They are typically used in thin sheet metals and wood.

BT or Type 25 thread cutting screws have spaced threads with a blunt point and tapererd entering threads like Type B, but with multiple cutting edges and chip cavities. They are intended for softer materials or thin sheet metals.

Type AB is similar to Type A, but with more threads per inch. This type of screw is recommended for sheet metals and wood.

Type T or Type 23 thread cutting screws have machine screw diameter-pitch combinations approximating Unified Form. These have a blunt point and tapered starting threads having a single cutting edge and flute for chip removal.Type B screws feature the same threads per

inch as the Type AB, but have a blunt point and incomplete starting threads. They are intended for sheet metals and wood.

Type 1 or Type D thread cutting screws have machine screw diameter-pitch combinations approximating Unified Form. These have a blunt point and tapered starting threads having a single cutting edge with chip cavity.

Self-piercing screws are used in thin sheet metals in order to avoid pre-drilling.

Tri-Lobular: Thread rolling screws have a tri-round cross section to provide relief areas when rolling internal threads. Used in metals toeliminate tapping.

Wood screws feature single lead threads with sharp crests, and a gimlet point. The threads can be rolled or cut at themanufacturer’s option.

Type U: Metallic drive screws with multiple start threads with a large helix angle and a pilot point. Used for permanent connections inmetals and plastics, installed by hammering the screw in place as opposed to threading.

A self-drilling wood screw with a cutting slot in the screw tip. For use in wood when pre-drilling isn’t practical.

CSD or BSD: Self-drilling screws are used to avoid pilot hole drilling. The screw will drill its own hole and tap its own threads. The drill point must penetrate the material completely before it begins tapping threads. Typically used in sheet metal and thin steel plate.

Type F screws have machine screw diameter-pitch combinations approximating Unified Form. These have a blunt point and tapered starting threads having multiple cutting edges and chip cavities.