Z Purlins (Zeds) Z
AS 1397 / AS/NZS 4600Cold-formed, galvanised Z sections that lap over supports for continuous purlin and girt runs. Dimensions per Lysaght Zeds & Cees. Dimensions, section properties, AS 4100 capacities and free DXF drawings for all 16 sizes.
Zed (Z) sections have one wide and one narrow flange, so two sections of the same depth nest together. That allows them to be lapped over supports for continuous purlin and girt runs, which roughly doubles the section where moment and shear are highest. Because the section is point-symmetric, its principal axes are inclined to the web (angle α), so unrestrained Zeds deflect sideways as well as down. Bridging and cladding restraint are essential.
Dimensions are those published by Lysaght. Design is to AS/NZS 4600 using the manufacturer's capacity tables.
Select any section in the table to open its page, with a dimensioned drawing, all section properties and a free DXF download for your CAD software.
| Designation | Mass kg/m | D mm | E mm | F mm | L mm | t mm | Ag mm² | Ix 10⁶mm⁴ | Zx 10³mm³ | Sx 10³mm³ | Iy 10⁶mm⁴ | ry mm | J 10³mm⁴ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Z10010 | 1.78 | 102 | 53 | 49 | 12.5 | 1.0 | 216 | 0.364 | 7.13 | 8.18 | 0.131 | 24.7 | 0.0719 |
| Z10012 | 2.10 | 102 | 53 | 49 | 12.5 | 1.2 | 257 | 0.432 | 8.48 | 9.74 | 0.155 | 24.5 | 0.124 |
| Z10015 | 2.62 | 102 | 53 | 49 | 13.5 | 1.5 | 323 | 0.537 | 10.5 | 12.2 | 0.197 | 24.7 | 0.242 |
| Z10019 | 3.29 | 102 | 53 | 49 | 14.5 | 1.9 | 409 | 0.673 | 13.2 | 15.3 | 0.250 | 24.7 | 0.492 |
| Z15012 | 2.89 | 152 | 65 | 61 | 15.5 | 1.2 | 353 | 1.28 | 16.9 | 19.6 | 0.303 | 29.3 | 0.170 |
| Z15015 | 3.59 | 152 | 65 | 61 | 16.5 | 1.5 | 443 | 1.60 | 21.1 | 24.4 | 0.383 | 29.4 | 0.332 |
| Z15019 | 4.51 | 152 | 65 | 61 | 17.5 | 1.9 | 561 | 2.01 | 26.5 | 30.8 | 0.487 | 29.5 | 0.675 |
| Z15024 | 5.70 | 152 | 66 | 60 | 19.5 | 2.4 | 712 | 2.53 | 33.3 | 39.0 | 0.632 | 29.8 | 1.37 |
| Z20015 | 4.49 | 203 | 79 | 74 | 15.0 | 1.5 | 555 | 3.53 | 34.8 | 40.4 | 0.621 | 33.4 | 0.416 |
| Z20019 | 5.74 | 203 | 79 | 74 | 18.5 | 1.9 | 713 | 4.52 | 44.5 | 51.9 | 0.843 | 34.4 | 0.858 |
| Z20024 | 7.24 | 203 | 79 | 73 | 21.5 | 2.4 | 907 | 5.70 | 56.2 | 65.8 | 1.10 | 34.8 | 1.74 |
| Z25019 | 6.50 | 254 | 79 | 74 | 18.0 | 1.9 | 808 | 7.62 | 60.0 | 71.1 | 0.833 | 32.1 | 0.972 |
| Z25024 | 8.16 | 254 | 79 | 73 | 21 | 2.4 | 1027 | 9.64 | 75.9 | 90.2 | 1.08 | 32.5 | 1.97 |
| Z30024 | 10.1 | 300 | 100 | 93 | 27 | 2.4 | 1264 | 17.0 | 113 | 133 | 2.32 | 42.8 | 2.43 |
| Z30030 | 12.8 | 300 | 100 | 93 | 31 | 3.0 | 1596 | 21.3 | 142 | 168 | 3.04 | 43.6 | 4.79 |
| Z35030 | 15.2 | 350 | 129 | 121 | 30 | 3.0 | 1911 | 35.8 | 205 | 239 | 5.93 | 55.7 | 5.73 |
Frequently asked questions
- Why do Zeds have two flange widths?
- The wide and narrow flanges let two Zeds of the same depth nest together, so they can be lapped over a support to make the purlin run continuous.
Relevant Australian Standards
- AS/NZS 4600:2018 Cold-formed steel structures
The design Standard for thin-walled cold-formed members such as C and Z purlins and light-gauge framing. - AS 1397:2021 Continuous hot-dip metallic coated steel sheet and strip
Covers the G450, G500 and G550 zinc-coated (Z350, Z450) and zinc/aluminium coated steel strip from which purlins, girts and light-gauge framing are roll-formed. - AS/NZS 1170 series Structural design actions
Defines dead, live (1170.1), wind (1170.2), snow (1170.3) and earthquake (AS 1170.4) actions and the load combinations (1170.0) that produce the design actions resisted by the capacities shown here.