SDS Truss Head Screws
Wide flat head for thin sheet and framing
The truss head is wide and flat. That large head spreads the pressure over more area, so the screw will not pull through thin sheet or soft board.
Stocked in Bengaluru · Special sizes made to order · Bulk rates available
Available sizes
Dia × Length (mm)
- 8 x 13
- 8 x 16
- 8 x 19
- 8 x 25
- 8 x 32
- 8 x 38
- 8 x 50
All 8 gauge. Other diameters and lengths made to order.
Available sizes for SDS Truss Head Screws: 8 x 13, 8 x 16, 8 x 19, 8 x 25, 8 x 32, 8 x 38, 8 x 50.
What it is used for
Use this screw when the material is thin or soft and a normal screw head would pull straight through it.
Thin metal sheet
The wide head grips without tearing through 0.5 mm sheet.
Metal framing
Joining studs, tracks and channels in partition and ceiling work.
Under boards
Sits almost flat, so board can be fixed over the top without packing.
Ducting and trays
Holds thin sheet sections together in HVAC and cable tray work.
Overview
It also sits almost flush with the surface, so a board or panel can pass over the top of it without catching.
This is the screw for metal framing, ceiling channels, ducting and anywhere the material is too thin for a normal head.
Twice the grip area
The wide head spreads the load over about double the area of a normal head.
Sits nearly flat
Board and panels slide over the fixing without needing to be packed out.
Neat finish
The smooth rounded head looks tidy where fixings are visible.
Kind to soft board
Much less likely to crush gypsum or fibre cement board.
Specifications
Standard stock configuration. Non-standard sizes, drives and coatings are made to order — ask us.
| Head | Truss (wafer) — wide, low profile |
|---|---|
| Head diameter | About 2.5 to 3 times the shank |
| Material | Case-hardened carbon steel |
| Finish | Zinc plated |
| Drive | Phillips PH2 / Pozidriv PZ2 |
| Diameter | 8 gauge |
| Length range | 13 mm to 50 mm |
| Drill point | #2 — up to 5 mm base steel |
| Best for | Thin sheet, framing, ducting, board |
| Packing | 250 / 500 / 1000 piece boxes |
Technical documentation
Exact specifications vary between manufacturers and production batches. Tell us the job and we will confirm the specification before despatch, and send the manufacturer’s datasheet or test certificate for the batch if you need it for a submittal.
Section 1 — Installation
How to fit it
The wide head is the whole point of this screw, so the aim is to land it flat and stop before it dents the material.
Drawing made for Modern Fastening Solution. Shown for guidance — check against your own job before ordering.
- 1
Keep the driver straight
A wide head driven at an angle only touches on one edge, which defeats the purpose.
- 2
Use medium speed
About 1,500 to 2,200 rpm. There is no benefit in going faster on thin material.
- 3
Stop when the head touches all round
The moment the whole head is sitting flat, stop. Going further dents the sheet.
- 4
Follow the fixing spacing
Use the spacing the sheet or board maker recommends, not a rule of thumb.
Section 2 — Applications
Where it is used
Thin, soft or easily damaged materials, and anywhere a low head has to stay out of the way.
Metal roofing and sheet
Thin roofing and cladding sheet where a wide head is needed to stop pull-through.
Partition and stud framing
Steel stud and track partition framing before the board goes on.
Ducting and HVAC
Duct sections, flanges and hangers where a low head keeps the airflow clean.
Panel fixing
Prefab and composite panels fixed back to light steel sections.
Electrical and control panels
Enclosure doors, mounting plates and trunking in panel shops.
Signage and advertising boards
Sign frames and display boards fixed to sheet and framing.
SDS Truss Head — questions we get asked
What is the difference between truss head and wafer head?
Nothing — they are two names for the same wide, low head. Both terms are used in the Indian market.
Why use truss head instead of a normal head?
Because it spreads the load. On thin sheet or soft board, a narrow head pulls straight through. A truss head holds.
Can I use these for roofing sheet?
Not for the sheet itself — they have no rubber washer, so the hole would leak. Use them for the framing behind the sheet.
What length do I need for 0.8 mm sheet on 1.6 mm track?
8 x 16 mm is the usual choice for that combination. Confirm your track thickness before ordering in quantity.
Request a price for SDS Truss Head
Send us the sizes and quantities and we will come back with a price, usually the same working day. Not sure of the size? Describe the job and we will work it out.
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Accessories
Sockets, Nut Setters & Driver Bits
The driving end of every fastener you install
View specificationsTell us what you need
Send us the sizes and quantities, a photo, or just a description of the job. Most quotations go out the same working day.
Monday – Saturday, 9:30 AM – 7:00 PM · Delivery across Bengaluru, Karnataka and all India