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Self Tapping

how do i tell the size of drill bits for self tapping screws?

i'm going to put timber on to 4x4 box metal to hang door, the metal will be standing away from a wall on its own, in concrete.

The answer is far from being straight forward. There are many factors involved. There are thread "tapping" screws and there are thread "forming" screws, the threading method is different but the result is very similar, with the formed thread being stronger due to work hardening.

The diameter for the screw hole would be different, based on forming or cutting. The relative hardness of the base material can also have impact on hole diameter. The material of the screw can also impact the outcome. The risk you run is this, too small you ruin the screw before it is all the way in the hole, too big and the threads easily strip out and carry no load.

Most self tapping screw manufacturers reccommend the pre-thread hole diameters. Unfortunately, it is nearly impossible to find who made the screw. My advice is to use a drill slightly larger than the screw shank (the unthreaded portion of your screw). Attempt to screw the screw in. If it stops prematurely, don't force it, remove it and re-drill with a drill that is 1/64th larger and try again. This should get you a hole that functions well and does not damage your box or your screws.

Find Self Tapping On eBay Below:

Unslot Hex Washer Head Hard Zinc Plated Self Drilling Tap Screws 8 x 18 x 1 2
Unslot Hex Washer Head Hard Zinc Plated Self Drilling Tap Screws 8 x 18 x 1 2
$4.49
Capri Tools 10024 Hex Self Tapping Screw Assortment 200 Piece
Capri Tools 10024 Hex Self Tapping Screw Assortment 200 Piece
$13.20
Lot Of 100 White 3 4 Cargo Utility RV Toy Trailer Exterior Self Tapping Screws
Lot Of 100 White 3 4 Cargo Utility RV Toy Trailer Exterior Self Tapping Screws
$13.95
Lot Of 1000 White 3 4 Cargo Utility RV Toy Trailer Exterior Self Tapping Screws
Lot Of 1000 White 3 4 Cargo Utility RV Toy Trailer Exterior Self Tapping Screws
$69.95
25 pcs Phillps Blue 9 inch roofing screw Self tapping
25 pcs Phillps Blue 9 inch roofing screw Self tapping
$5.99
Self Tapping Drilling Screws 3 1 2 inch 10X16 Phillips Head 25 pc per order
Self Tapping Drilling Screws 3 1 2 inch 10X16 Phillips Head 25 pc per order
$8.75
25 pcs Phillps Black 9 inch roofing screw Self tapping
25 pcs Phillps Black 9 inch roofing screw Self tapping
$5.99
Capri Tools 10024 Hex Self Tapping Screw Assortment 200 Piece
Capri Tools 10024 Hex Self Tapping Screw Assortment 200 Piece
$15.66
Eye Lag Screws Self Tapping Ceilings Grid Tees Hanger Wire Metal Joists 50 Pack
Eye Lag Screws Self Tapping Ceilings Grid Tees Hanger Wire Metal Joists 50 Pack
$23.99
Aeroflow 3 4 Self Venting Tap
Aeroflow 3 4 Self Venting Tap
$2.48
SCREW SELF TAPPING DRILL DRILLING STONE GRAY COLOR HEAD 14 14x7 8 LOT OF 250
SCREW SELF TAPPING DRILL DRILLING STONE GRAY COLOR HEAD 14 14x7 8 LOT OF 250
$59.99
Set 10 Self tapping screw Cylindrical Head 42X16 Inox Pz 8 Hardware Screws Hobb
Set 10 Self tapping screw Cylindrical Head 42X16 Inox Pz 8 Hardware Screws Hobb
$11.21
Set 10 Self tapping screw Cylindrical Head 42X22 Inox Pz 5 Hardware Mounting Ha
Set 10 Self tapping screw Cylindrical Head 42X22 Inox Pz 5 Hardware Mounting Ha
$11.21
Set 10 Self tapping screw Cylindrical Head 48X19 Inox Pz 4 Hardware Screws Hobb
Set 10 Self tapping screw Cylindrical Head 48X19 Inox Pz 4 Hardware Screws Hobb
$11.21
Set 10 Self Tapping Screw Head Piana 29X22 Cross Pz 24 Hardware Screws
Set 10 Self Tapping Screw Head Piana 29X22 Cross Pz 24 Hardware Screws
$11.21
Set 10 Self Tapping Screw Flat Head Stainless 35X22 Pz 8 Hardware Mounting Hard
Set 10 Self Tapping Screw Flat Head Stainless 35X22 Pz 8 Hardware Mounting Hard
$11.21
Set 10 Self Tapping Screw Flat Head Stainless 42X22 Pz 5 Hardware Mounting Hard
Set 10 Self Tapping Screw Flat Head Stainless 42X22 Pz 5 Hardware Mounting Hard
$11.21
Capri Tools 10024 Hex Self Tapping Screw Assortment 200 Piece
Capri Tools 10024 Hex Self Tapping Screw Assortment 200 Piece
$38.55
100 x Square Flat Head 8 x 2 Self Tap Drill Screw
100 x Square Flat Head 8 x 2 Self Tap Drill Screw
$7.99
Arrowhead PK1290 Green Oval Handle and Self Tapping SS Screw New
Arrowhead PK1290 Green Oval Handle and Self Tapping SS Screw New
$7.30
Screws Kit Self Tapping Screw Assortment Zinc Steel Nail Home Repair 200 Piece
Screws Kit Self Tapping Screw Assortment Zinc Steel Nail Home Repair 200 Piece
$15.99
100 pc M2 x 8 M28 Philip round flat head self tapping countersunk screws golden
100 pc M2 x 8 M28 Philip round flat head self tapping countersunk screws golden
$2.98
Buildex 75 Count 3 16 in x 225 in White Steel Self Tapping Concrete Screw
Buildex 75 Count 3 16 in x 225 in White Steel Self Tapping Concrete Screw
$29.44
Buildex 1 4 in x 225 in White Steel Self Tapping Concrete Screw
Buildex 1 4 in x 225 in White Steel Self Tapping Concrete Screw
$30.06
Buildex 75 Count 1 4 in x 325 in Blue Steel Self Tapping Concrete Screw
Buildex 75 Count 1 4 in x 325 in Blue Steel Self Tapping Concrete Screw
$42.46
Sheet Metal Screws Flat Head Phillips Self tapping 8 x 3 1 2 Qty 2500
Sheet Metal Screws Flat Head Phillips Self tapping 8 x 3 1 2 Qty 2500
$371.76
Sheet Metal Screws Flat Head Phillips Self tapping 8 x 3 8 Qty 25
Sheet Metal Screws Flat Head Phillips Self tapping 8 x 3 8 Qty 25
$5.34
10024 hex self tapping screw assortment 200 piece
10024 hex self tapping screw assortment 200 piece
$15.23
New Mason Industries SAST 1 2 X 5 Self Tapping Seismic Anchor Bolts Box of 8
New Mason Industries SAST 1 2 X 5 Self Tapping Seismic Anchor Bolts Box of 8
$19.99
Pan Black Head Screw  8 X 1 1 2 Quad Drive Self Tap Drilling Screws Cargo RV
Pan Black Head Screw 8 X 1 1 2 Quad Drive Self Tap Drilling Screws Cargo RV
$6.85
New Mason Industries SAST 1 2 X 5 Self Tapping Seismic Anchor Bolts Box of 8
New Mason Industries SAST 1 2 X 5 Self Tapping Seismic Anchor Bolts Box of 8
$24.99
Capri Tools 10024 Hex Self Tapping Screw Assortment 200 Piece
Capri Tools 10024 Hex Self Tapping Screw Assortment 200 Piece
$12.80
Capri Tools 10024 Hex Self Tapping Screw Assortment 200 Piece
Capri Tools 10024 Hex Self Tapping Screw Assortment 200 Piece
$13.83
 x 4 Drop Ceiling Self Tapping Wood Eye Screws Lot of 50 PCs
x 4 Drop Ceiling Self Tapping Wood Eye Screws Lot of 50 PCs
$4.95
100 Pc Square Flat Head Type 2 PT Stainless Steel 8 x 1 Self Tap Drill Screw
100 Pc Square Flat Head Type 2 PT Stainless Steel 8 x 1 Self Tap Drill Screw
$18.00
Ansen Tools AN 101 Self Tapping Hex Washer Head Screw Assortment 200 Piece New
Ansen Tools AN 101 Self Tapping Hex Washer Head Screw Assortment 200 Piece New
$20.83
200 Pieces Self Drilling Drywall Hollow Wall Anchors with Tapping Screws Kit
200 Pieces Self Drilling Drywall Hollow Wall Anchors with Tapping Screws Kit
$20.55
2 X 310 pcs620 7 15x1 2 Buildex Teks Self Tapping Screws 1 4 Hex Drive
2 X 310 pcs620 7 15x1 2 Buildex Teks Self Tapping Screws 1 4 Hex Drive
$19.99
Buildex 75 Count 3 16 in x 325 in Blue Steel Self Tapping Concrete Screw
Buildex 75 Count 3 16 in x 325 in Blue Steel Self Tapping Concrete Screw
$34.49
Buildex 50 Count 1 4 in x 4 in Blue Steel Self Tapping Concrete Screw
Buildex 50 Count 1 4 in x 4 in Blue Steel Self Tapping Concrete Screw
$41.93


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