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san fernando valley nuts and bolts
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san fernando valley nuts and bolts
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san fernando valley nuts and bolts
These screws drill their own hole and then tap threads to combine two or more pieces of material. This is done with nothing more than a standard power drill motor. These screws are also known as TEK® screws, but are not to be confused with self-tapping or sheet metal screws which do not pre-drill. All screws are available with installed bonded sealing washers, having various diameters and material, for weather-tight sealing of roof and wall applications. Heads can be painted any color. We carry both imported and domestic screws, included forged and milled points, although milled point is becoming less common.

A number of head styles are available although Hex Washer Head (H/W/H) is most prominent. Applications include Steel-to-Steel, Low-Profile Architectural Fasteners, Wood-to-Metal and Metal-to-Wood, Metal Roof and Wall Applications, Interior and Exterior Insulation Applications, and Masonry and Cement Board Applications. Choose the drill point that is needed based on the thickness of the material that is to be drilled. The following charts for standard and special purpose fasteners are to be used as a guide only.

Standard Fasteners

Application

Use

Dia.


Material
Thickness

Point Length
Inches | Decimal

Light
Gauge
Metals

Teks / 2
tek_stand_2.jpg - 5874 Bytes

No. 4

.035 To .080

9/16

.140

No. 6

.035 To .090

9/64

.140

No. 8

.035 To .100

5/32

.156

No. 10

.035 To .110

13/64

.203

No. 12

.035 To .140

15/64

.234

1/4"

.035 To .175

19/64

.296

Medium
Gauge
Metals

Teks / 3
tek_stand_3.jpg - 4944 Bytes

No. 8

.100 To .140

13/64

.203

No. 10

.110 To .175

1/4

.250

No. 12

.110 To .210

9/32

.281

1/4"

.110 To .250

5/16

.312

Heavier
Gauge
Metals

Teks / 4
tek_stand_4.jpg - 4826 Bytes

No. 12

.175 To .210

9/32

.281

1/4"

.175 To .250

5/16

.312

Heavier
Gauge
Metals

Special Teks / 2
tek_stand_s4.jpg - 5411 Bytes

No. 12

.210 To .345

7/16

.437

1/4"

.250 To .375

15/32

.468

Heavier
Gauge
Metals

Teks
tek_stand_drillit.jpg - 4663 Bytes

No. 12 .250 To .500 5/8 .625

 

Special Purpose Fasteners

Application

Use

Diameter

Recommended
Material
Thickness
Cold Rolled
Steel

Sheet
To
Sheet

Stitch Teks
tek_spec_stitch.jpg - 5342 Bytes

1/4"
5/16"

To 2
Sheets
of 24 Ga.

Plywood Or
Composite
(Over 1/2" max)
To Metal

Plymetal Teks
tek_spec_plymetal.jpg - 5363 Bytes

No. 10

To .175
Max.

Plywood Or
Composite
(Over 1/2")
To Metal

Plymetal Teks
with Wings
tek_spec_wings.jpg - 5911 Bytes

No. 10

.089 Min.
To
.175 Max.

Drywall
To Metal
Or Wood

Drywall Teks
tek_spec_drywall.jpg - 5911 Bytes

No. 6

No.8

Up To
26 Ga.

Gypsum To
Metal
Studding

Gypsum Teks
tek_spec_gypsum.jpg - 5911 Bytes

No. 6

.035
To
.090

2x4 Or
Firring
To Steel

tek_spec_header.jpg - 4213 Bytes

No. 12

No.14

.089 Min.
To
.210 Max

 

DECIMAL EQUIVALENTS
OF STANDARD GAUGES
OF SHEET STEEL
AND SHEET ALUMINUM
Number
of
Gauge
(Thickness in decimal
parts of an inch)
ALUMINIUM
(B&S)
SHEET
STEEL
(Mfg. Std.)

000000

.5800

.....

00000

.5165

.....

0000

.4600

.4082

000

.4096

.375

00

.3648

.3437

0

.3249

.3125

1

.2893

.2812

2

.2576

.2656

3

.2294

.2391

4

.2043

.2242

5

.1819

.2092

6

.1620

.1943

7

.1443

.1793

8

.1285

.1644

9

.1144

.1495

10

.1019

.1345

11

.0907

.1196

12

.0808

.1046

13

.0720

.0897

14

.0641

.0747

15

.0571

.0673

16

.0508

.0598

17

.0453

.0538

18

.0403

.0478

19

.0359

.0418

20

.0320

.0359

21

.0285

.0329

22

.0253

.0299

23

.0226

.0269

24

.0201

.0239

25

.0179

.0209

26

.0159

.0179

27

.0142

.0164

28

.0126

.0149

29

.0113

.0135

30

.0100

.0120

31

.0089

.0105

32

.0080

.0097

33

.0071

.0090

34

.0063

.0082

35

.0056

.0075

36

.0050

.0067

37

.0045

.0064

38

.0040

.0060

 

Self-drilling screws are available in the following material:

  • Zinc-Plated Steel - The most common and provides very good rust resistance.

  • Weather-Guard Coated (STALGARD®) - Helps protect ferrous metals from rust and corrosion better than many conventional finishes.

  • Stainless Steel - Both 18-8 and 410 are available. 18-8 provides excellent corrosion resistance. It can be mildly magnetic. 410 is stronger than 18-8 and is magnetic. It should be used in a chemical environment.

In addition, a special hybrid consisting of a hard steel driver fused at mid-body with an 18-8 head provides superior drilling and excellent corrosion resistance.

STYLES

  • Hex Washer Head - The built-in washer provides an excellent bearing surface. They can be slotted or unslotted, although unslotted is most common. The length is measured from under the head.
  • Pan Head - This low profile head can be a phillips or a square drive. The length is measured from under the head.
  • Flat Head - This countersunk head sinks into wood for a flush finish. The length is measured from the top of the head.
  • Oval Head - A countersunk base (like a flat head) but with an oval on top for a finished look. The length is measured from the top of the head.
  • Flat Head Reamer - A flat top and phillips drive ream wood and then cut steel in one operation. Wings ream clearance hole in thick layers of low density materials to prevent thread engaugement. When the point penetrates the metal underneath, the wings break off and the threads engauge normally. The length is measured from the top of the head.
  • Round Washer Head - These are similar to HWH but have a round head with a phillips drive. They are also known as Metal Lath or K-Lath or Modified
  • Truss Screws - The length is measured from under the head.
  • Wafer Head - Also know as plymetal because they can be used to attach plywood to metal. The large wafer head sinks into the plywood and has a large bearing surface. The length is measured from the top of the head.
  • Drywall Bugle Head - These will fasten drywall to metal studs (0.105"). The length is measured from the top of the head.
  • Pan Framing - A phillips drive stud-framing screw for attaching stud to track. The length is measured from under the head.
  • Pancake Head - A very low profile head with a large bearing surface. The length is measured from under the head.
  • Square Trim -- A square drive and reduced head for tight spaces. The length is measured from under the head.

nuts and bolts san fernando valleyClick here for our "Size Availability Chart"


INSTALLATION GUIDELINES

S/D/S incorporate similar point geometry that is found in a standard drill bit. The drill point diameter, angle, web thickness, rake angle, chisel angle and flute depth assures a fast drill and low pressure for drilling.

The flute removes the chips that are generated during drilling. The flute length and depth in conjunction with the drill point diameter and pilot length determine the thickness of the material the screw is capable of drilling.

The length of the pilot section on the drill point is based on the thickness of the material to be drilled. This unthreaded portion assures that the drilling action of the screw point is complete before the first thread engauges the material.

Maximum drilling efficiency is attained as the screw advances at a rate of approximately 0.004 inches per revolution. Note that drilling speeds are higher than conventional screws. A speed of 2,500 RPM and a torque limiting device is recommended. Slower speeds will result in proportionately longer drilling times. S/D/S must complete the metal drilling function and fully penetrate the material before the first screw thread engauges. In order to meet this requirement, the unthreaded length of the screw point (pilot) must be equal to, or greater than, the material thickness to be drilled. Note that where there is more than one sheet of material, the calculation of the total thickness to be drilled must include voids or spaces between sheets.

Once the hole is drilled, the screw taps the hole in the same way as thread forming or thread cutting screws do in a pre-drilled hole. S/D/S provide advantages over self-tapping screws into pre-drilled holes by always drilling the proper hole for optimum fastening, and eliminate torque variations caused by paint build-up or foreign material in the pre-drilled hole.

SPECIALS

A cousin of self-drilling screws is ZIP or Sharp-Point Screws. These have a very sharp point for penetrating thin sheet metal.

Special Requirements? Click here or call us toll-free at 800-688-7265


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san fernando valley nuts and bolts