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Screw Fastening Systems |
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| 5.2.2 | Kwik-Pro Self-Drilling Screws |
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| 5.2.2.2 MATERIAL SPECIFICATIONS |
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| Material | Sizes 6, 8, 10 and 12--AISI 1019 |
| Size 1/4"--AISI 1022 | |
| Heat Treatment | Size 6--.002 to .007 inches. Case Harden and Temper |
| Sizes 8, 10 and 12--.004 to .009 inches. Case Harden and Temper | |
| Size 1/4"--.006 to .011 inches. Case Harden and Temper | |
| Plating | Decking screws--Black Phosphate (8-18 x 5/16 & 5/16 PHF #3) |
| Kwik-Cote and Flo-Seal screws--.0007 to .0015 inches Kwik-Cote Treatment | |
| Note: Due to environmental considerations, Hilti does not plate with cadmium | |
| Kwik-Cote Treatment | Kwik-Cote is a unique copolymer coating which protects self-drilling screws against galvanic corrosion. The Kwik-Cote treatment, applied to standard self-drilling screws, is entirely compatible with other metals such as aluminum and bimetals. |
| Average Ultimate Strengths--Pullout |
|
| Average Ultimate Pullout Loads for Standard Self-Drilling Screws |
| Screw Thread |
Head Style |
Point | Base Steel Thickness | |||||||||||
| 20 GA lb (kN) |
18 GA lb (kN) |
16 GA lb (kN) |
14 GA lb (kN) |
13 GA lb (kN) |
12 GA lb (kN) |
10 GA lb (kN) |
5/32" lb (kN) |
3/16" lb (kN) |
7/32" lb (kN) |
1/4" lb (kN) |
1/2" lb (kN) |
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| #6-20 | HWH/PPH | 2 | 285 (1.3) |
470 (2.1) |
585 (2.6) |
875 (3.9) |
1065 (4.7) |
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| #8-18 | HWH/PPH | 2 | 300 (1.3) |
525 (2.3) |
660 (2.9) |
950 (4.2) |
1215 (5.4) |
1540 (6.9) |
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| #10-16 | HWH | 2 | 320 (1.4) |
535 (2.4) |
700 (3.1) |
980 (4.4) |
1290 (5.7) |
1600 (7.1) |
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| #8-18 | SHWH | 3 | 1330 (5.9) |
1575* (7.0) |
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| #10-16 | HWH/PPH | 3 | 1450 (6.5) |
1970 (8.8) |
2100* (9.3) |
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| #12-14 | HWH | 3 | 1545 (6.9) |
2180 (9.7) |
2685 (11.9) |
2800* (12.5) |
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| #1/4-14 | HWH | 3 | 1745 (7.8) |
2285 (10.2) |
3220 (14.3) |
3850* (17.1) |
3850* (17.1) |
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| *
Indicates screw failed in tension before pull-out
occurred. Test cannot be run for each possible combination of fastener and materials. Published tests should be used as a guide only. Sheet metal used for the standard and specialty self-drilling screw test data is cold rolled 1010 strip steel, 1/4 to 1/2 hard; RB60-85, yield strength 33 to 50 ksi. |
| Average Ultimate Strengths--Pullout |
|
| Average Ultimate Pullout Loads for Specialty Self-Drilling Screws |
| Screw Thread |
Head Style |
Point | Base Steel Thickness | |||||||||||
| 20 GA lb (kN) |
18 GA lb (kN) |
16 GA lb (kN) |
14 GA lb (kN) |
13 GA lb (kN) |
12 GA lb (kN) |
10 GA lb (kN) |
5/32" lb (kN) |
3/16" lb (kN) |
7/32" lb (kN) |
1/4" lb (kN) |
1/2" lb (kN) |
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| #10-24 | PWH | 3 | 300 (1.3) |
495 (2.2) |
605 (2.7) |
920 (4.1) |
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| #8-18 | PFH | 3 | 290 (1.3) |
475 (2.1) |
585 (2.6) |
845 (3.8) |
1070 (4.8) |
1550 (6.9) |
1575 (7.0) |
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| #12-24 w/Wings | PFH | 4 | 530 (2.4) |
780 (3.5) |
1070 (4.8) |
1125 (5.0) |
1645 (7.3) |
2120 (9.4) |
2350 (10.5) |
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| 1/4 -20 w/Wings | PFH | 4 | 605 (2.7) |
985 (4.4) |
1200 (5.3) |
1450 (6.5) |
2070 (9.2) |
2500 (11.1) |
3520 (15.7) |
4120* (18.3) |
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| #12-24 | HWH | 4 | 675 (3.0) |
880 (3.9) |
1350 (6.0) |
1940 (8.6) |
2605 (11.6) |
3195 (14.2) |
3250* (14.5) |
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| #12-24 | HWH | Dril-It | 740 (3.3) |
885 (3.9) |
1400 (6.2) |
2010 (8.9) |
2555 (11.4) |
3125 (13.9) |
3250* (14.5) |
3250* (14.5) |
3250* (14.5) |
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| #11-16 W/Wings | PWH | 4 | 905 (4.0) |
1900 (8.5) |
1960 (8.7) |
2050 (9.1) |
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| #12-14 | HWH | 5 | 2850 (12.7) |
4000 (17.8) |
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| * Indicates screw
failed in tension before pull-out occurred. Test cannot be run for each possible combination of fastener and materials. Published tests should be used as a guide only. Sheet metal used for the standard and specialty self-drilling screw test data is cold rolled 1010 strip steel, 1/4 to 1/2 hard; RB60-85, yield strength 33 to 50 ksi. |
| Average Ultimate Strengths--Screw Only |
|
| Does Not Consider Base Material Thickness |
| Size | Torsional Strength |
Tensile Strength |
Shear Strength |
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| in-lb | (Nm) | in | (kN) | in | (kN) | |
| 4-24 | 14 | (1.6) | 750 | (3.3) | 490 | (2.2) |
| 4-40 | 14 | (1.6) | 800 | (3.6) | 520 | (2.3) |
| 6-20 | 25 | (2.8) | 1185 | (5.3) | 740 | (3.3) |
| 6-32 | 26 | (2.9) | 1200 | (5.3) | 790 | (3.5) |
| 8-18 | 42 | (4.8) | 1575 | (7.0) | 1050 | (4.7) |
| 8-32 | 50 | (5.7) | 1900 | (8.5) | 1265 | (5.6) |
| 10-16 | 61 | (6.9) | 2100 | (9.3) | 1400 | (6.2) |
| 10-24 | 65 | (7.3) | 2300 | (10.2) | 1570 | (7.0) |
| 10-32 | 75 | (8.5) | 2700 | (12.0) | 1800 | (8.0) |
| 12-14 | 92 | (10.4) | 2800 | (12.4) | 1875 | (8.3) |
| 12-24 | 100 | (11.3) | 3250 | (14.5) | 2175 | (9.7) |
| 1/4-14 | 150 | (17.0) | 3850 | (17.1) | 2590 | (11.5) |
| 1/4-20 | 168 | (19.0) | 4275 | (19.0) | 2870 | (12.8) |
| Pullover Test |
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| Average Ultimate Pullover Loads for Standard Self-Drilling Screws* |
| Fastener | 18 Ga lb (kN) |
20 Ga lb (kN) |
22 Ga lb (kN) |
24 Ga lb (kN) |
26 Ga lb (kN) |
| #10-16 x 11/2"HWH ** | 1655 (7.4) | 1100 (4.9) | 830 (3.7) | 750 (3.3) | 505 (2.3) |
| #12-14 x 2" HWH | 1525 (6.8) | 1050 (4.7) | 795 (3.5) | 710 (3.2) | 505 (2.3) |
| #12-24 x 11/2"HWH | 1440 (6.4) | 1100 (4.9) | 730 (3.3) | 700 (3.1) | 470 (2.1) |
| #1/4"-14 x 2"HWH | 1940 (8.6) | 1224 (5.4) | 950 (4.2) | 855 (3.8) | 600 (2.7) |
| * All gauges of steel
tested were 33,000 psi minimum yield strength. **The washer on Hex Washer Head Screws is an integral part of the head and cannot be removed. |
| Average Ultimate Pullover Loads for Special Self-Drilling Screws |
| Fastener | 24 Gauge Siding* lb (kN) |
26 Gauge Siding** lb (kN) |
| #12-14 x 11/4"Flo-Seal | 1015 (4.5) |
850 (3.8) |
| #1/4-14 x 11/2"Flo-Seal | 985 (4.4) |
845 (3.8) |
| #12-24 Dril-It 5/8 Bonded Washer | 1045 (4.7) |
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| * Actual yield strength 61,000 psi. ** Actual yield strength 106,000 psi. |
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