Home > Companies > Fixfast Ltd > SureFast® RS 4.8 mm Fasteners

4.8 mm carbon steel self-drilling fasteners for flat roofing, and for fixing to thin steel and timber.

Features and benefits:

  • High quality carbon steel with SAE1022 hardened case.
  • Drillpoint designed for fast, accurate penetration of metal decks up to 2 x 1 mm.
  • Optimised thread design for good pull-out performance and resistance to unwinding.
  • Compatible with a range of SureFast® tube washers and pressure plates – consult manufacturer for details.
  • Manufactured in accordance with ISO 9001 and ISO 14001 Quality and Management Systems.


For mechanical fixing of the following:

  • Single-ply and flat roofing systems to steel and timber decks in combination with appropriate SureFast® components.
  • Flat roofing accessories and trims to thin steel and timber materials.
  • Timber battens and similar materials to thin steel.

For use in the following locations:

  • Buildings in residential and commercial settings with humidity class of Class 1, Class 2 or Class 3 to BS 5250.
  • Buildings with an internal temperature range of -45°C to 50°C.

To be fixed with Fixfast TX25 drive bar range.

Fixfast products must be used as a complete system with tools and accessories as recommended - consult manufacturer for details.

Standard product features


Steel SAE1022 case, hardened.


Multiple layer organic.

Head type:

Low profile oval style, TX25 drive.

Drilling capacity:

2 x 1 mm S275 steel sheets.

Drill point width:

3 mm.

Head diameter:

9.1 mm.

Minimum penetration:

  • Thin steel: 15 mm (through underside).
  • Plywood/ oriented strand board (OSB) decks: 12 mm (through underside).
  • Timber board decks: 12 mm (through underside).
  • Softwood: 35 mm (embedment).

Build up:

6–104 mm (dependent on fastener used).

Durability class:

  • Interior environments: C1 (25).
  • Semi-interior: 20.
  • Urban C2 (12).
  • Rural: C3.
  • Industrial/ coastal: C4.
  • Marine: C5.

Technical characteristics:

Pull out values (axial load resistance): On 0.7 mm steel: 1.18 kN; on 0.9 mm steel: 1.92 kN; on 1 mm steel: 2.12 kN.

Other figures and specific testing are available on request - consult manufacturer for information.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-50-60/415 Self-drilling or self-tapping screws

Product specification

An important note about specifying



Fixfast Ltd


+44 (0)1732 882387

Product reference

[SureFast® RS 4.8 mm Fasteners, SF-RS-4.8 x 40]
40 x 4.8 mm (l x diameter).
[SureFast® RS 4.8 mm Fasteners, SF-RS-4.8 x 60]
60 x 4.8 mm (l x diameter).
[SureFast® RS 4.8 mm Fasteners, SF-RS-4.8 x 80]
80 x 4.8 mm (l x diameter).
[SureFast® RS 4.8 mm Fasteners, SF-RS-4.8 x 100]
100 x 4.8 mm (l x diameter).
[SureFast® RS 4.8 mm Fasteners, SF-RS-4.8 x 120]
120 x 4.8 mm (l x diameter).
[SureFast® RS 4.8 mm Fasteners, SF-RS-4.8 x 160]
160 x 4.8 mm (l x diameter).


Consult manufacturer for information.
[Not required]

Manufacturer details

Merlin House,
Seven Mile Lane,
Borough Green,
Kent, TN15 8QY
Tel +44 (0)1732 882387
Fax +44 (0)1732 885532
NBS Plus