Rollformed Structural Members
C-purlins (C100–C250), Z-purlins (Z150–Z250), bridging channel, sag rods, purlin cleats, eave struts, wall girts and structural fasteners. G450/G550 Z350 galvanised steel. Standard lengths 6.0 m, 7.2 m, 9.0 m and 12.0 m. Enquiry-based supply.
Quick Reference — Purlin Sizes
C100
100×65×20mm
C150 / Z150
150×65×20mm
C200 / Z200
200×75×25mm
C230 / Z230
230×75×25mm
C250 / Z250
250×75×25mm
Z-Purlins
Same as C range
C-purlins (lipped channel sections) are the primary rollformed structural member for roof purlins and wall girts in steel-framed industrial, commercial and agricultural buildings. Manufactured from G450 or G550 high-tensile Z350 galvanised steel, Millform C-purlins are available in web depths of 100 mm, 150 mm, 200 mm, 230 mm and 250 mm, with flange widths of 65 mm and lips of 20 mm. BMT options range from 1.5 mm to 3.0 mm. Standard lengths are 6.0 m, 7.2 m, 8.0 m, 9.0 m and 12.0 m. All sections are pre-punched with 18 mm diameter holes at 200 mm centres in the web for bridging rod and services.
Technical Note
C-purlin span capacity is governed by AS/NZS 4600:2018. For continuous spans (lapped at supports), capacity increases by approximately 50% over simple span. Minimum lap length is 10% of span or 300 mm, whichever is greater. Bridging is required at mid-span for spans over 6.0 m. Verify span tables for your specific load case, purlin spacing and wind region.
| SKU | Description | QTY | Length (mm) | |
|---|---|---|---|---|
| CP100-15-6.0 | C-purlin C100 — 100×65×20mm — 1.5 BMT G450 Z350 — 6.0m | 1 | — | |
| CP100-20-6.0 | C-purlin C100 — 100×65×20mm — 2.0 BMT G450 Z350 — 6.0m | 1 | — | |
| CP100-25-6.0 | C-purlin C100 — 100×65×20mm — 2.5 BMT G450 Z350 — 6.0m | 1 | — | |
| CP150-15-6.0 | C-purlin C150 — 150×65×20mm — 1.5 BMT G450 Z350 — 6.0m | 1 | — | |
| CP150-19-6.0 | C-purlin C150 — 150×65×20mm — 1.9 BMT G450 Z350 — 6.0m | 1 | — | |
| CP150-24-6.0 | C-purlin C150 — 150×65×20mm — 2.4 BMT G450 Z350 — 6.0m | 1 | — | |
| CP150-30-6.0 | C-purlin C150 — 150×65×20mm — 3.0 BMT G550 Z350 — 6.0m | 1 | — | |
| CP150-15-7.2 | C-purlin C150 — 150×65×20mm — 1.5 BMT G450 Z350 — 7.2m | 1 | — | |
| CP150-19-7.2 | C-purlin C150 — 150×65×20mm — 1.9 BMT G450 Z350 — 7.2m | 1 | — | |
| CP150-24-7.2 | C-purlin C150 — 150×65×20mm — 2.4 BMT G450 Z350 — 7.2m | 1 | — | |
| CP150-19-9.0 | C-purlin C150 — 150×65×20mm — 1.9 BMT G450 Z350 — 9.0m | 1 | — | |
| CP150-24-9.0 | C-purlin C150 — 150×65×20mm — 2.4 BMT G450 Z350 — 9.0m | 1 | — | |
| CP200-15-6.0 | C-purlin C200 — 200×75×25mm — 1.5 BMT G450 Z350 — 6.0m | 1 | — | |
| CP200-19-6.0 | C-purlin C200 — 200×75×25mm — 1.9 BMT G450 Z350 — 6.0m | 1 | — | |
| CP200-24-6.0 | C-purlin C200 — 200×75×25mm — 2.4 BMT G450 Z350 — 6.0m | 1 | — | |
| CP200-30-6.0 | C-purlin C200 — 200×75×25mm — 3.0 BMT G550 Z350 — 6.0m | 1 | — | |
| CP200-15-7.2 | C-purlin C200 — 200×75×25mm — 1.5 BMT G450 Z350 — 7.2m | 1 | — | |
| CP200-19-7.2 | C-purlin C200 — 200×75×25mm — 1.9 BMT G450 Z350 — 7.2m | 1 | — | |
| CP200-24-7.2 | C-purlin C200 — 200×75×25mm — 2.4 BMT G450 Z350 — 7.2m | 1 | — | |
| CP200-19-9.0 | C-purlin C200 — 200×75×25mm — 1.9 BMT G450 Z350 — 9.0m | 1 | — | |
| CP200-24-9.0 | C-purlin C200 — 200×75×25mm — 2.4 BMT G450 Z350 — 9.0m | 1 | — | |
| CP200-24-12.0 | C-purlin C200 — 200×75×25mm — 2.4 BMT G450 Z350 — 12.0m | 1 | — | |
| CP230-19-6.0 | C-purlin C230 — 230×75×25mm — 1.9 BMT G450 Z350 — 6.0m | 1 | — | |
| CP230-24-6.0 | C-purlin C230 — 230×75×25mm — 2.4 BMT G450 Z350 — 6.0m | 1 | — | |
| CP230-30-6.0 | C-purlin C230 — 230×75×25mm — 3.0 BMT G550 Z350 — 6.0m | 1 | — | |
| CP230-19-7.2 | C-purlin C230 — 230×75×25mm — 1.9 BMT G450 Z350 — 7.2m | 1 | — | |
| CP230-24-7.2 | C-purlin C230 — 230×75×25mm — 2.4 BMT G450 Z350 — 7.2m | 1 | — | |
| CP230-24-9.0 | C-purlin C230 — 230×75×25mm — 2.4 BMT G450 Z350 — 9.0m | 1 | — | |
| CP250-24-6.0 | C-purlin C250 — 250×75×25mm — 2.4 BMT G450 Z350 — 6.0m | 1 | — | |
| CP250-30-6.0 | C-purlin C250 — 250×75×25mm — 3.0 BMT G550 Z350 — 6.0m | 1 | — | |
| CP250-24-7.2 | C-purlin C250 — 250×75×25mm — 2.4 BMT G450 Z350 — 7.2m | 1 | — | |
| CP250-30-7.2 | C-purlin C250 — 250×75×25mm — 3.0 BMT G550 Z350 — 7.2m | 1 | — | |
| CP250-24-9.0 | C-purlin C250 — 250×75×25mm — 2.4 BMT G450 Z350 — 9.0m | 1 | — |
Z-purlins (zed sections) are used in overlapping continuous purlin systems where the opposing flanges allow adjacent purlins to nest and overlap at supports, providing a highly efficient continuous beam action. Millform Z-purlins are available in web depths of 150 mm, 200 mm, 230 mm and 250 mm, with 65 mm or 75 mm flanges and 20–25 mm lips. BMT options from 1.5 mm to 3.0 mm. Standard lengths are 6.0 m, 7.2 m, 8.0 m, 9.0 m and 12.0 m. Z-purlins are supplied in left-hand (LH) and right-hand (RH) orientations for lapping — specify orientation when ordering.
Technical Note
Z-purlin lapped systems provide 30–50% greater span capacity than simple-span C-purlins of the same section. Minimum lap length per AS/NZS 4600:2018 is 10% of span or 300 mm. Laps must be bolted with a minimum of two M12 bolts per lap. Bridging is required at mid-span and at 1/3 points for spans over 9.0 m.
| SKU | Description | QTY | Length (mm) | |
|---|---|---|---|---|
| ZP150-15-6.0-LH | Z-purlin Z150 — 150×65×20mm — 1.5 BMT G450 Z350 — 6.0m — LH | 1 | — | |
| ZP150-15-6.0-RH | Z-purlin Z150 — 150×65×20mm — 1.5 BMT G450 Z350 — 6.0m — RH | 1 | — | |
| ZP150-19-6.0-LH | Z-purlin Z150 — 150×65×20mm — 1.9 BMT G450 Z350 — 6.0m — LH | 1 | — | |
| ZP150-19-6.0-RH | Z-purlin Z150 — 150×65×20mm — 1.9 BMT G450 Z350 — 6.0m — RH | 1 | — | |
| ZP150-24-6.0-LH | Z-purlin Z150 — 150×65×20mm — 2.4 BMT G450 Z350 — 6.0m — LH | 1 | — | |
| ZP150-24-6.0-RH | Z-purlin Z150 — 150×65×20mm — 2.4 BMT G450 Z350 — 6.0m — RH | 1 | — | |
| ZP150-19-7.2-LH | Z-purlin Z150 — 150×65×20mm — 1.9 BMT G450 Z350 — 7.2m — LH | 1 | — | |
| ZP150-19-7.2-RH | Z-purlin Z150 — 150×65×20mm — 1.9 BMT G450 Z350 — 7.2m — RH | 1 | — | |
| ZP200-15-6.0-LH | Z-purlin Z200 — 200×75×25mm — 1.5 BMT G450 Z350 — 6.0m — LH | 1 | — | |
| ZP200-15-6.0-RH | Z-purlin Z200 — 200×75×25mm — 1.5 BMT G450 Z350 — 6.0m — RH | 1 | — | |
| ZP200-19-6.0-LH | Z-purlin Z200 — 200×75×25mm — 1.9 BMT G450 Z350 — 6.0m — LH | 1 | — | |
| ZP200-19-6.0-RH | Z-purlin Z200 — 200×75×25mm — 1.9 BMT G450 Z350 — 6.0m — RH | 1 | — | |
| ZP200-24-6.0-LH | Z-purlin Z200 — 200×75×25mm — 2.4 BMT G450 Z350 — 6.0m — LH | 1 | — | |
| ZP200-24-6.0-RH | Z-purlin Z200 — 200×75×25mm — 2.4 BMT G450 Z350 — 6.0m — RH | 1 | — | |
| ZP200-30-6.0-LH | Z-purlin Z200 — 200×75×25mm — 3.0 BMT G550 Z350 — 6.0m — LH | 1 | — | |
| ZP200-30-6.0-RH | Z-purlin Z200 — 200×75×25mm — 3.0 BMT G550 Z350 — 6.0m — RH | 1 | — | |
| ZP200-19-7.2-LH | Z-purlin Z200 — 200×75×25mm — 1.9 BMT G450 Z350 — 7.2m — LH | 1 | — | |
| ZP200-19-7.2-RH | Z-purlin Z200 — 200×75×25mm — 1.9 BMT G450 Z350 — 7.2m — RH | 1 | — | |
| ZP200-24-7.2-LH | Z-purlin Z200 — 200×75×25mm — 2.4 BMT G450 Z350 — 7.2m — LH | 1 | — | |
| ZP200-24-7.2-RH | Z-purlin Z200 — 200×75×25mm — 2.4 BMT G450 Z350 — 7.2m — RH | 1 | — | |
| ZP200-24-9.0-LH | Z-purlin Z200 — 200×75×25mm — 2.4 BMT G450 Z350 — 9.0m — LH | 1 | — | |
| ZP200-24-9.0-RH | Z-purlin Z200 — 200×75×25mm — 2.4 BMT G450 Z350 — 9.0m — RH | 1 | — | |
| ZP230-24-6.0-LH | Z-purlin Z230 — 230×75×25mm — 2.4 BMT G450 Z350 — 6.0m — LH | 1 | — | |
| ZP230-24-6.0-RH | Z-purlin Z230 — 230×75×25mm — 2.4 BMT G450 Z350 — 6.0m — RH | 1 | — | |
| ZP230-30-6.0-LH | Z-purlin Z230 — 230×75×25mm — 3.0 BMT G550 Z350 — 6.0m — LH | 1 | — | |
| ZP230-30-6.0-RH | Z-purlin Z230 — 230×75×25mm — 3.0 BMT G550 Z350 — 6.0m — RH | 1 | — | |
| ZP230-24-7.2-LH | Z-purlin Z230 — 230×75×25mm — 2.4 BMT G450 Z350 — 7.2m — LH | 1 | — | |
| ZP230-24-7.2-RH | Z-purlin Z230 — 230×75×25mm — 2.4 BMT G450 Z350 — 7.2m — RH | 1 | — | |
| ZP250-24-6.0-LH | Z-purlin Z250 — 250×75×25mm — 2.4 BMT G450 Z350 — 6.0m — LH | 1 | — | |
| ZP250-24-6.0-RH | Z-purlin Z250 — 250×75×25mm — 2.4 BMT G450 Z350 — 6.0m — RH | 1 | — | |
| ZP250-30-6.0-LH | Z-purlin Z250 — 250×75×25mm — 3.0 BMT G550 Z350 — 6.0m — LH | 1 | — | |
| ZP250-30-6.0-RH | Z-purlin Z250 — 250×75×25mm — 3.0 BMT G550 Z350 — 6.0m — RH | 1 | — | |
| ZP250-24-7.2-LH | Z-purlin Z250 — 250×75×25mm — 2.4 BMT G450 Z350 — 7.2m — LH | 1 | — | |
| ZP250-24-7.2-RH | Z-purlin Z250 — 250×75×25mm — 2.4 BMT G450 Z350 — 7.2m — RH | 1 | — | |
| ZP250-30-7.2-LH | Z-purlin Z250 — 250×75×25mm — 3.0 BMT G550 Z350 — 7.2m — LH | 1 | — | |
| ZP250-30-7.2-RH | Z-purlin Z250 — 250×75×25mm — 3.0 BMT G550 Z350 — 7.2m — RH | 1 | — |
Bridging provides lateral restraint to C and Z purlins, preventing lateral-torsional buckling under load. Millform supplies three bridging systems: (1) Bridging channel — a roll-formed C-section clipped to the purlin web; (2) Sag rods — 12 mm or 16 mm diameter round bar threaded at each end, tensioned between purlins; (3) Anti-sag bars — flat bar or angle welded between purlins at mid-span. Bridging must be installed at mid-span for spans over 6.0 m, and at third-points for spans over 9.0 m, per AS/NZS 4600:2018.
Technical Note
Bridging must be connected to a fixed point (rafter, column or end wall) to be effective. Sag rods must be tensioned — slack sag rods provide no lateral restraint. For Z-purlin lapped systems, bridging is required at the lap point as well as mid-span.
| SKU | Description | QTY | Length (mm) | |
|---|---|---|---|---|
| BC-C150-6.0 | Bridging channel — suits C/Z150 purlins — G300 Z275 — 6.0m | 1 | — | |
| BC-C200-6.0 | Bridging channel — suits C/Z200 purlins — G300 Z275 — 6.0m | 1 | — | |
| BC-C230-6.0 | Bridging channel — suits C/Z230 purlins — G300 Z275 — 6.0m | 1 | — | |
| BC-C250-6.0 | Bridging channel — suits C/Z250 purlins — G300 Z275 — 6.0m | 1 | — | |
| BC-CLIP-C150 | Bridging clip — suits C/Z150 purlin web — Z275 galvanised | 1 | — | |
| BC-CLIP-C200 | Bridging clip — suits C/Z200 purlin web — Z275 galvanised | 1 | — | |
| BC-CLIP-C230 | Bridging clip — suits C/Z230 purlin web — Z275 galvanised | 1 | — | |
| BC-CLIP-C250 | Bridging clip — suits C/Z250 purlin web — Z275 galvanised | 1 | — | |
| SR-12-6.0 | Sag rod — 12mm dia. threaded rod — galvanised — 6.0m length | 1 | — | |
| SR-16-6.0 | Sag rod — 16mm dia. threaded rod — galvanised — 6.0m length | 1 | — | |
| SR-NUT-12 | Sag rod nut & washer set — suits 12mm rod — galvanised | 1 | — | |
| SR-NUT-16 | Sag rod nut & washer set — suits 16mm rod — galvanised | 1 | — | |
| ASB-40-6.0 | Anti-sag bar — 40×5mm flat bar — G300 Z275 — 6.0m | 1 | — | |
| ASB-50-6.0 | Anti-sag bar — 50×5mm flat bar — G300 Z275 — 6.0m | 1 | — |
Purlin cleats connect C and Z purlins to the top flange of primary rafters. Millform supplies a comprehensive range of cleats for C-purlin and Z-purlin systems, including standard purlin cleats (welded or bolted to rafter), apex cleats (for ridge connections), eave cleats (for eave purlin connections) and adjustable rafter brackets (for variable rafter pitch). All cleats are manufactured from G300 Z275 galvanised steel and are pre-drilled for M12 bolts.
Technical Note
Cleat selection depends on purlin depth, rafter flange width and the design uplift load. For high-wind regions (C and D), use heavy-duty cleats with a minimum of four M12 bolts per connection. Apex cleats must be designed to transfer the horizontal thrust from opposing rafters.
| SKU | Description | QTY | Length (mm) | |
|---|---|---|---|---|
| PC-C150-STD | Purlin cleat — suits C/Z150 — standard — G300 Z275 galvanised | 1 | — | |
| PC-C200-STD | Purlin cleat — suits C/Z200 — standard — G300 Z275 galvanised | 1 | — | |
| PC-C230-STD | Purlin cleat — suits C/Z230 — standard — G300 Z275 galvanised | 1 | — | |
| PC-C250-STD | Purlin cleat — suits C/Z250 — standard — G300 Z275 galvanised | 1 | — | |
| PC-C150-HD | Purlin cleat — suits C/Z150 — heavy duty — G300 Z275 galvanised | 1 | — | |
| PC-C200-HD | Purlin cleat — suits C/Z200 — heavy duty — G300 Z275 galvanised | 1 | — | |
| PC-C230-HD | Purlin cleat — suits C/Z230 — heavy duty — G300 Z275 galvanised | 1 | — | |
| PC-C250-HD | Purlin cleat — suits C/Z250 — heavy duty — G300 Z275 galvanised | 1 | — | |
| AC-C150 | Apex cleat — suits C/Z150 — G300 Z275 galvanised | 1 | — | |
| AC-C200 | Apex cleat — suits C/Z200 — G300 Z275 galvanised | 1 | — | |
| EC-C150 | Eave cleat — suits C/Z150 — G300 Z275 galvanised | 1 | — | |
| EC-C200 | Eave cleat — suits C/Z200 — G300 Z275 galvanised | 1 | — | |
| ARB-C150 | Adjustable rafter bracket — suits C/Z150 — G300 Z275 galvanised | 1 | — | |
| ARB-C200 | Adjustable rafter bracket — suits C/Z200 — G300 Z275 galvanised | 1 | — |
Wall girts are horizontal C or Z sections spanning between columns to support wall cladding. They carry wind load (suction and pressure) and the self-weight of the cladding. The same C-purlin and Z-purlin section range is used for wall girts — selection depends on column spacing, cladding weight and wind load zone. Millform wall girts are supplied in the same lengths and BMT options as the purlin range. Girt-to-column connections use standard purlin cleats or welded plate connections.
Technical Note
Wall girt design must consider both inward (pressure) and outward (suction) wind loads per AS/NZS 1170.2. In high-wind regions, suction loads often govern girt selection. Bridging is required for girt spans over 6.0 m. For cladding with a high self-weight (e.g. masonry veneer), verify girt deflection limits per NCC 2022.
| SKU | Description | QTY | Length (mm) | |
|---|---|---|---|---|
| WG-C150-15-6.0 | Wall girt C150 — 150×65×20mm — 1.5 BMT G450 Z350 — 6.0m | 1 | — | |
| WG-C150-19-6.0 | Wall girt C150 — 150×65×20mm — 1.9 BMT G450 Z350 — 6.0m | 1 | — | |
| WG-C150-24-6.0 | Wall girt C150 — 150×65×20mm — 2.4 BMT G450 Z350 — 6.0m | 1 | — | |
| WG-C200-15-6.0 | Wall girt C200 — 200×75×25mm — 1.5 BMT G450 Z350 — 6.0m | 1 | — | |
| WG-C200-19-6.0 | Wall girt C200 — 200×75×25mm — 1.9 BMT G450 Z350 — 6.0m | 1 | — | |
| WG-C200-24-6.0 | Wall girt C200 — 200×75×25mm — 2.4 BMT G450 Z350 — 6.0m | 1 | — | |
| WG-C200-19-7.2 | Wall girt C200 — 200×75×25mm — 1.9 BMT G450 Z350 — 7.2m | 1 | — | |
| WG-C200-24-7.2 | Wall girt C200 — 200×75×25mm — 2.4 BMT G450 Z350 — 7.2m | 1 | — | |
| WG-Z150-19-6.0-LH | Wall girt Z150 — 150×65×20mm — 1.9 BMT G450 Z350 — 6.0m — LH | 1 | — | |
| WG-Z150-19-6.0-RH | Wall girt Z150 — 150×65×20mm — 1.9 BMT G450 Z350 — 6.0m — RH | 1 | — | |
| WG-Z200-19-6.0-LH | Wall girt Z200 — 200×75×25mm — 1.9 BMT G450 Z350 — 6.0m — LH | 1 | — | |
| WG-Z200-19-6.0-RH | Wall girt Z200 — 200×75×25mm — 1.9 BMT G450 Z350 — 6.0m — RH | 1 | — | |
| WG-Z200-24-6.0-LH | Wall girt Z200 — 200×75×25mm — 2.4 BMT G450 Z350 — 6.0m — LH | 1 | — | |
| WG-Z200-24-6.0-RH | Wall girt Z200 — 200×75×25mm — 2.4 BMT G450 Z350 — 6.0m — RH | 1 | — |
Eave struts serve the dual function of eave purlin (supporting roof sheeting at the eave) and top wall girt (supporting wall cladding at the eave). They are typically a deeper C or Z section than the standard purlin to accommodate the combined loading. Millform eave struts are available in C200, C230 and C250 sections in 2.4 BMT and 3.0 BMT. Ridge caps are roll-formed C-sections used at the apex to close the ridge and support the ridge capping flashing.
Technical Note
Eave struts must be designed for the combined roof and wall wind loads. In cyclonic regions (C and D), eave struts are typically the most heavily loaded member in the purlin system. Verify eave strut capacity with your structural engineer for wind regions C and D.
| SKU | Description | QTY | Length (mm) | |
|---|---|---|---|---|
| ES-C200-24-6.0 | Eave strut C200 — 200×75×25mm — 2.4 BMT G450 Z350 — 6.0m | 1 | — | |
| ES-C200-30-6.0 | Eave strut C200 — 200×75×25mm — 3.0 BMT G550 Z350 — 6.0m | 1 | — | |
| ES-C230-24-6.0 | Eave strut C230 — 230×75×25mm — 2.4 BMT G450 Z350 — 6.0m | 1 | — | |
| ES-C230-30-6.0 | Eave strut C230 — 230×75×25mm — 3.0 BMT G550 Z350 — 6.0m | 1 | — | |
| ES-C250-24-6.0 | Eave strut C250 — 250×75×25mm — 2.4 BMT G450 Z350 — 6.0m | 1 | — | |
| ES-C250-30-6.0 | Eave strut C250 — 250×75×25mm — 3.0 BMT G550 Z350 — 6.0m | 1 | — | |
| ES-C200-24-7.2 | Eave strut C200 — 200×75×25mm — 2.4 BMT G450 Z350 — 7.2m | 1 | — | |
| ES-C230-24-7.2 | Eave strut C230 — 230×75×25mm — 2.4 BMT G450 Z350 — 7.2m | 1 | — | |
| RC-C150-6.0 | Ridge cap C150 — 150×65×20mm — 1.5 BMT G450 Z350 — 6.0m | 1 | — | |
| RC-C200-6.0 | Ridge cap C200 — 200×75×25mm — 1.9 BMT G450 Z350 — 6.0m | 1 | — |
Structural connections in C and Z purlin systems require high-strength bolts to AS/NZS 1252:2016 (M12 and M16, Grade 8.8) for cleat-to-rafter and lap connections. Purlin-to-cleat connections use 12-14×20 mm hex-head self-drilling screws (Class 3 or Class 4 coating). Steel Source Australia supplies a complete range of structural bolts, nuts, washers and purlin screws for rollformed structural systems.
Technical Note
All bolts in purlin cleat connections must be Grade 8.8 minimum per AS/NZS 4600:2018. Galvanised bolts (Class 4.6 or 8.8 HDG) are required in C3 and above environments. Do not use zinc-plated bolts in exposed or coastal applications.
| SKU | Description | QTY | Length (mm) | |
|---|---|---|---|---|
| SB-M12-50-88-HDG | Bolt M12×50mm — Grade 8.8 — hot-dip galvanised — with nut & washer | 1 | — | |
| SB-M12-75-88-HDG | Bolt M12×75mm — Grade 8.8 — hot-dip galvanised — with nut & washer | 1 | — | |
| SB-M16-50-88-HDG | Bolt M16×50mm — Grade 8.8 — hot-dip galvanised — with nut & washer | 1 | — | |
| SB-M16-75-88-HDG | Bolt M16×75mm — Grade 8.8 — hot-dip galvanised — with nut & washer | 1 | — | |
| SB-M12-NUT-HDG | Nut M12 — Grade 8 — hot-dip galvanised | 1 | — | |
| SB-M16-NUT-HDG | Nut M16 — Grade 8 — hot-dip galvanised | 1 | — | |
| SB-M12-WASH-HDG | Washer M12 — structural — hot-dip galvanised | 1 | — | |
| SB-M16-WASH-HDG | Washer M16 — structural — hot-dip galvanised | 1 | — | |
| PS-1214-20-C3 | Purlin screw 12-14×20mm hex head — Class 3 — box 100 | 1 | — | |
| PS-1214-20-C4 | Purlin screw 12-14×20mm hex head — Class 4 — box 100 | 1 | — | |
| PS-1214-25-C3 | Purlin screw 12-14×25mm hex head — Class 3 — box 100 | 1 | — | |
| PS-1214-25-C4 | Purlin screw 12-14×25mm hex head — Class 4 — box 100 | 1 | — |
Applicable Standards
Compliance & Standards
AS/NZS 4600:2018
Cold-Formed Steel Structures
Primary design standard for C and Z purlins. Governs span tables, lap lengths, bridging requirements, cleat design and connection capacity.
AS/NZS 1397:2021
Metallic Coated Steel Sheet & Strip
Specifies Z350 zinc coating mass (350 g/m² total both sides) and mechanical properties for G450 and G550 high-tensile steel grades.
AS/NZS 1170.2:2021
Wind Actions
Determines design wind pressures for purlin and girt design. Wind region (A–D) and terrain category govern the design wind speed.
AS/NZS 1252:2016
High-Strength Structural Bolts
Specifies Grade 8.8 bolts for structural connections in purlin cleat and lap connections.
AS 3566.2:2002
Self-Drilling Screws — Corrosion Resistance
Governs Class 3 and Class 4 coating requirements for purlin screws in external and coastal applications.
NCC 2022 Vol. One
National Construction Code
Section B (Structure) performance requirements for structural members in Class 2–9 buildings, including deflection limits and load combinations.
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