Factory photograph of double tek screws. Finishes shown are examples — all fifteen catalogue finishes are available on this item.
Double Tek Screws
Double thread self-drilling screws. Two thread starts mean the screw advances twice as far per turn, so the fixing goes home faster — useful where an installer is placing hundreds of screws a day.
- M1.4-6.3(0#-14#)
- 6mm-300mm
- Double thread form — faster advance per revolution
- Thread forms also available as Type-A, BSB, CSB, hi-low and machine
- IFI, DIN, JIS, GB or customer drawing
Specification
- Item code
- BF-148
- Standard
- IFI,DIN,JIS,GB,Special Design
- Size Range
- M1.4-6.3(0#-14#)
- Length Range
- 6mm-300mm
- Material
- Carbon steel and stainless steel A2 A4 and 410
- Product group
- Self Drilling Screws / Tek Screws
Item code BF-148 follows our internal catalogue reference — quote it and we know exactly which line you mean. Figures shown are the specification range this item is made to, not a stock list.
Selection options
Every option below can be specified against this item. Head and drive are chosen independently of each other, and of the point and thread form.
| Head types | Options |
|---|---|
| Available | Flat · Pan · Hex washer head · Hex washer flange · Bugle · Wafer · Pan washer · Oval · Flower · Truss · Round |
| Drive types | Options |
|---|---|
| Available | Phillips · Square · Pozidriv · Square + Phillips · Torx · Slotted · Phillips + slotted |
| Point types | Options |
|---|---|
| Available | TEK#1 · TEK#2 · TEK#3 · TEK#4 · TEK#5 · Type 17 |
| Thread forms | Options |
|---|---|
| Available | Type-A · BSB · CSB · Hi-low · Machine · Double |
| Surface finishes | Options |
|---|---|
| Available | Plain · Zinc plated · Colour zinc · Blue zinc · White zinc · Black zinc · Black phosphate · Grey phosphate · Black oxide · Dacrotized · Ruspert · Xylan · Nickel · Bronze · Spray paint |
| Additional requests | Options |
|---|---|
| Available | Serration under head · Without washer · With bonded washer · With PVC washer · With steel + EPDM washer · With rubber washer · With head mark · With wing · Slotted + wing |
Questions we get asked about this item
Does a double thread hold as well as a single?
The pull-out is set by the thread engagement and the substrate, not by the number of starts. Give us the substrate and we will confirm the thread form to use.
Which thread forms do you make?
Type-A, BSB, CSB, hi-low, machine and double, plus special forms to drawing.
Also in Self Drilling Screws / Tek Screws
See all
Longer Hex Washer Head Tek Screws
Long hex washer head self-drilling screws in yellow zinc, for fixings that have to reach through insulation or a build-up of layers
View specification
Pan Framing Tek Screws
Pan framing self-drilling screws — the screw used for light gauge steel framing, where studs and tracks have to be joined quickly an
View specification
Truss Tek Screws
Truss head self-drilling screws with a washer face, supplied zinc plated.
View specification
Truss Tek Screws (BF-153)
Truss head self-drilling screws in a yellow zinc finish.
View specificationRelated reading: self drilling vs self tapping · finishes and salt spray · materials and property classes
Quote Double Tek Screws
Send diameter, length, head, drive, material, finish and quantity. If the combination you need is not on the standard matrix, send a drawing instead.