Spit Teks Self Drilling Steel Screws

Head Styles

The correct head style choice ensures stability during driving, proper clamping and desired finish. Some heads allow access to confined applications.

Point Types

The sharp convex drill point has precise cutting edges to ensure quick engagement and no 'walk'

Flutes

Teks / 5 - 12.5mm maximum steel thickness

The drilling section is designed to efficiently remove debris and precisely size the hole for the thread. The length of the flute must be greater than the thickness of the steel to avoid the flute clogging.

Pilot Section

A short length before the thread to ensure the drilling operation is complete before the thread engages. Once the thread engages the steelwork, the screw will be driven forward at a faster rate than the drill point can drill the hole and point damage could result. When fixing thin sheet to support steelwork, a screw with a pilot section is required to avoid this premature thread engagement and jacking-up of the first sheet.

Tapping Thread

Advances the screw through the hole

Thread Portion

Correct thread selection optimises low installation torque with high pullout. Wide spaced or coarse threads are generally used for light gauge steel (A), closer spaced or finer threads for heavier gauge (B). (Effective thread length (ETL) is the maximum length of thread available after the minimum penetration has been made in steel) Teks screws must penetrate through the steel to expose at least two full threads.

Optional Integral Washer

Teks screws with integral washers are available to prevent moisture, ingress and also bimetallic corrosion. When using a Washered Teks screw it is essential to ensure that the washer is set correctly to avoid water ingress. The only sure way is by using a tool with a depth sensitive nose piece. For optimum performance a minimum of 430 watts with an RPM range of 0 - 2,000 is required. Using a torque sensitive tool may result in an incorrect setting.

Performance Information

Steel Thickness	Loading	Drill 3 Ø4.8mm	Drill 3 Ø5.5mm	Drill 4 Ø5.5mm	Drill 5 Ø5.5mm
0.9mm	Tensile	0.44
	Shear	1.07
1.2mm	Tensile	0.73	0.8
	Shear	2.13	2.0
1.5mm	Tensile	1.04	1.11
	Shear	2.26	2.38
2.0mm	Tensile	1.42	1.56
	Shear	2.28	2.89
2.5mm	Tensile	2.16	2.39
	Shear	2.28	2.91
3.0mm	Tensile	2.5	2.88
	Shear	2.28	2.91
4.0mm	Tensile		3.34	2.24	2.24
	Shear		2.91	3.86	3.86
5.0mm	Tensile		4.3	5.53	5.43
	Shear		2.91	3.96	3.96
6.0mm+	Tensile			5.86	5.86
	Shear			4.05	4.05

Range Specification

Drill 3 Ø4.8mm	Drill 3 Ø5.5mm	Drill 4 Ø5.5mm	Drill 5 Ø5.5mm
TC13	TC25	TFM57	TL32
TC16	TC50	TFM70	TL38
CFC16	TC62	TFM75	TL50
CFC24	TC75		TFL42
MXS16	TC100		TFL62
TFC36	CFC26		TFL80
TFC38	MXHT60		TFL90
TFC45	MXHT80		TFL100
	MXC26		ASF77
	MXC32		ASF78
	TFC50		CFL32
	TFC61		MXL38
	TFC80
	TFC90
	TFC100
	SC28

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