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Screw Fastening Systems
5.2.3 Kwik-Flex Self-Drilling Screws

5.2.3.3 TECHNICAL DATA

Kwik-Flex Screw Specification Table
Fastener
Size/Diameter		 Fastened Material Minimum Spacing
in.		 Minimum Edge Distance
in.
No. 12 Steel 11/16 3/8
Aluminum 9/16 7/16
1/4 Steel 3/4 3/8
Aluminum 5/8 1/2

Kwik-Flex Allowable Pull-Out and Shear 1
Screw
Type		 Screw
Size		 Point
Style		 Max.
Drill Cap.2in.		 Pull-Out, lb (kN)
Steel (in.) Aluminum (in.)
12 Gauge3 1/8 3/16 1/4 5/16 3/8 1/8 1/4
Self-drill 12-14 3 .175 460
(2.05)		 620
(2.76)		 -- -- -- -- 210
(0.93)		 --
  1/4-14 3 .210 480
(2.14)		 740
(3.29)		 1015
(4.52)		 -- -- -- 240
(1.07)		 --
  1/4-20 4 .375 500
(2.22)		 765
(3.40)		 1045
(4.65)		 1215
(5.40)		 1275
(5.67)		 -- 230
(1.02)		 700
(3.11)
Self-Tap 1/4-14 -- -- 505
(2.25)		 440
(1.96)		 665
(2.96)		 935
(4.16)		 1020
(4.54)		 1185
(5.27)		 275
(1.22)		 785
(3.49)
  Drill 5     (.201) (.228) (.228) (.228) (.228) (.228) (.201) (.205)
  1. Steel members shall conform to ASTM A36. Aluminum members shall be 6063-T5 aluminum alloy.
  2. The maximum drill capacity is the maximum metal thickness the fastener can self drill and self tap.
  3. Base metal thickness of No. 12 gauge steel is 0.102 inches.
  4. Clearance holes are not drilled in the 1/4" thick steel. The members to be connected must be clamped together during fastener installation.
  5. The diameter of the required predrilled hole is shown in inches.


Screw
Type		 Screw
Size		 Point
Style		 Max.
Drill Cap.2
in.		 Shear, lb (kN)
1/8 Aluminum to 1/8 Aluminum 1/8 Aluminum to 1/4 Aluminum 1/8 Steel to 3/16 Steel 3/16 Steel to 1/4 Steel 1/4 Steel3 ,4 to 12 Gauge Steel
Self-drill 12-14 3 .175 335
(1.49)		 475
(2.11)		 -- -- --
  1/4-14 3 .210 405
(1.80)		 590
(2.62)		 635
(2.82)		 -- --
  1/4-20 4 .375 395
(1.76)		 570
(2.54)		 670
(2.98)		 715
(3.18)		 660
(2.94)
Self-Tap 1/4-14 -- -- 405
(1.80)		 590
(2.62)		 635
(2.82)		 -- --
  Drill 5     (.204) (.204) (.204)    
  1. Steel members shall conform to ASTM A36. Aluminum members shall be 6063-T5 aluminum alloy.
  2. The maximum drill capacity is the maximum metal thickness the fastener can self drill and self tap.
  3. Base metal thickness of No. 12 gauge steel is 0.102 inches.
  4. Clearance holes are not drilled in the 1/4" thick steel. The members to be connected must be clamped together during fastener installation.
  5. The diameter of the required predrilled hole is shown in inches.

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