Proprietary fasteners

Surefix

Class 4 carbon-steel fasteners with a 45 µm Zinc-Tin coating, rated to 2 000 hours of salt spray.

Class 3 & 4
SANS 1273-2011
ISO 9223 selection

Overview

Proprietary fasteners

Surefix is Roofco's proprietary fastener range, specified to SANS 1273-2011. The C1022 carbon-steel body carries a 45 µm Zinc-Tin alloy coating verified to 2 000 hours of salt-spray exposure and 20 Kesternich SO2 cycles.

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Technical specification

Specification

Corrosion class: Class 4
Base material: C1022 Carbon Steel
Coating: 45 µm Zinc-Tin alloy
Salt spray rating: 2 000 hr
Kesternich cycles: 20
Standard: SANS 1273-2011

Coating & class

C1022 Carbon Steel (45 µm Zinc-Tin coating)

Corrosivity selection

Fastener class by environment

Surefix fastener class suitability by ISO 9223 corrosivity zone
Fastener class	C1	C2	C3	C4	C5 Industrial	C5 Marine
Class 1	Yes	NR	NR	NR	NR	NR
Class 2	Yes	NR	NR	NR	NR	NR
Class 3	Yes	Yes	Yes	NR	NR	NR
Class 4	Yes	Yes	Yes	Yes	NR	NR
300-series stainless	Yes	Yes	Yes	Yes	316	316

ISO 9223 corrosivity zones. Yes = suitable, NR = not recommended, 316 = use 316-grade stainless. C5 environments require additional protection.

Fastener range

The Surefix range

22 mm wafer head (SF3)Concealed-fix onto steel purlins (Surelok)
45 mm wafer head T17 (SF3)Concealed-fix onto timber (Surelok)
25 mm hex headPierced-fix vertical cladding onto steel girts (Corrugated, IBR, Widespan)
38 mm hex headPierced-fix onto steel purlins (Corrugated)
50 mm hex headPierced-fix onto steel purlins (Widespan)
65 mm hex headPierced-fix onto steel purlins (IBR)
50 / 65 mm hex head T17Timber (Corrugated)
75 / 85 mm hex head T17Timber (IBR, Widespan)
75 mm self-drilling polywingPolycarbonate onto steel (Resol IBR)
22 mm stitching screwSidelap stitching & flashings