PRODUCTS / Mild Steel Flat Bar
Mild Steel Flat Bar
Flat bar is hot-rolled rectangular mild steel to AS/NZS 3679.1, used for straps, plates, gussets and bracketry across the Gold Coast.
Widths
20mm to 300mm
Thicknesses
3mm to 25mm
Lengths
6.0m standard
Cut to size
On request
Flat bar is the all-purpose strap stock. Need a gusset, a strap, a backing plate, a hinge tail, a blade for a scraper, a tie for a bit of carpentry? Flat bar covers it.
We carry the popular widths in a range of thicknesses, so you can match the bar to the job — light 20×3 for hold-downs and brackets, heavy 100×10 or 100×12 for serious structural straps and base plates.
Flat bar drops are also a stalwart of the off-cut bin — if you only want a short piece, have a rummage before you order a full length.
Common applications
What it's used for.
- Hold-down straps and ties
- Gussets and reinforcing plates
- Hinge bands and gate hardware
- Equipment blades and scraper edges
- Base plates for posts
- Trailer and tray edging
- Bracket and bracketry stock
Sizes we carry
Standard Flat Bar sizes — pulled straight from the rack.
marks the sizes we move most often. Other sizes available on request.
See full size reference → for every standard section we stock.
Stock varies by size. Call us before you drive to confirm what's on the shelf today.
Standard flat bar sizes per AS/NZS 3679.1. Stocked items vary — call us for what's on the shelf.
Marshall Steel — Mild Steel Flat Bar
Standard flat bar sizes per AS/NZS 3679.1. Stocked items vary — call us for what's on the shelf. · 9 Stevenson Court, Burleigh Heads QLD · 07 5576 6037
| Width × Thickness (mm) | Mass (kg/m) | Standard length (m) | |
|---|---|---|---|
| 20 × 3 | 0.47 | 6.0 | |
| 20 × 5 | 0.78 | 6.0 | |
| 20 × 6 | 0.94 | 6.0 | |
| 20 × 8 | 1.26 | 6.0 | |
| 20 × 10 | 1.57 | 6.0 | |
| 25 × 3 | 0.59 | 6.0 | |
| 25 × 5 | 0.98 | 6.0 | |
| 25 × 6 | 1.18 | 6.0 | |
| 25 × 8 | 1.57 | 6.0 | |
| 25 × 10 | 1.96 | 6.0 | |
| 25 × 12 | 2.35 | 6.0 | |
| 32 × 3 | 0.75 | 6.0 | |
| 32 × 5 | 1.26 | 6.0 | |
| 32 × 6 | 1.51 | 6.0 | |
| 32 × 8 | 2.01 | 6.0 | |
| 32 × 10 | 2.51 | 6.0 | |
| 32 × 12 | 3.01 | 6.0 | |
| 40 × 3 | 0.94 | 6.0 | |
| 40 × 5 | 1.57 | 6.0 | |
| 40 × 6 | 1.88 | 6.0 | |
| 40 × 8 | 2.51 | 6.0 | |
| 40 × 10 | 3.14 | 6.0 | |
| 40 × 12 | 3.77 | 6.0 | |
| 40 × 16 | 5.02 | 6.0 | |
| 50 × 3 | 1.18 | 6.0 | |
| 50 × 5 | 1.96 | 6.0 | |
| 50 × 6 | 2.35 | 6.0 | |
| 50 × 8 | 3.14 | 6.0 | |
| 50 × 10 | 3.92 | 6.0 | |
| 50 × 12 | 4.71 | 6.0 | |
| 50 × 16 | 6.28 | 6.0 | |
| 50 × 20 | 7.85 | 6.0 | |
| 65 × 3 | 1.53 | 6.0 | |
| 65 × 5 | 2.55 | 6.0 | |
| 65 × 6 | 3.06 | 6.0 | |
| 65 × 8 | 4.08 | 6.0 | |
| 65 × 10 | 5.10 | 6.0 | |
| 65 × 12 | 6.12 | 6.0 | |
| 65 × 16 | 8.16 | 6.0 | |
| 65 × 20 | 10.2 | 6.0 | |
| 75 × 3 | 1.77 | 6.0 | |
| 75 × 5 | 2.94 | 6.0 | |
| 75 × 6 | 3.53 | 6.0 | |
| 75 × 8 | 4.71 | 6.0 | |
| 75 × 10 | 5.89 | 6.0 | |
| 75 × 12 | 7.06 | 6.0 | |
| 75 × 16 | 9.42 | 6.0 | |
| 75 × 20 | 11.8 | 6.0 | |
| 75 × 25 | 14.7 | 6.0 | |
| 100 × 3 | 2.35 | 6.0 | |
| 100 × 5 | 3.92 | 6.0 | |
| 100 × 6 | 4.71 | 6.0 | |
| 100 × 8 | 6.28 | 6.0 | |
| 100 × 10 | 7.85 | 6.0 | |
| 100 × 12 | 9.42 | 6.0 | |
| 100 × 16 | 12.6 | 6.0 | |
| 100 × 20 | 15.7 | 6.0 | |
| 100 × 25 | 19.6 | 6.0 | |
| 125 × 3 | 2.94 | 6.0 | |
| 125 × 5 | 4.91 | 6.0 | |
| 125 × 6 | 5.89 | 6.0 | |
| 125 × 8 | 7.85 | 6.0 | |
| 125 × 10 | 9.81 | 6.0 | |
| 125 × 12 | 11.8 | 6.0 | |
| 125 × 16 | 15.7 | 6.0 | |
| 125 × 20 | 19.6 | 6.0 | |
| 125 × 25 | 24.5 | 6.0 | |
| 150 × 3 | 3.53 | 6.0 | |
| 150 × 5 | 5.89 | 6.0 | |
| 150 × 6 | 7.06 | 6.0 | |
| 150 × 8 | 9.42 | 6.0 | |
| 150 × 10 | 11.8 | 6.0 | |
| 150 × 12 | 14.1 | 6.0 | |
| 150 × 16 | 18.8 | 6.0 | |
| 150 × 20 | 23.5 | 6.0 | |
| 150 × 25 | 29.4 | 6.0 | |
| 200 × 3 | 4.71 | 6.0 | |
| 200 × 5 | 7.85 | 6.0 | |
| 200 × 6 | 9.42 | 6.0 | |
| 200 × 8 | 12.6 | 6.0 | |
| 200 × 10 | 15.7 | 6.0 | |
| 200 × 12 | 18.8 | 6.0 | |
| 200 × 16 | 25.1 | 6.0 | |
| 200 × 20 | 31.4 | 6.0 | |
| 200 × 25 | 39.2 | 6.0 | |
| 250 × 6 | 11.8 | 6.0 | |
| 250 × 8 | 15.7 | 6.0 | |
| 250 × 10 | 19.6 | 6.0 | |
| 250 × 12 | 23.6 | 6.0 | |
| 250 × 16 | 31.4 | 6.0 | |
| 250 × 20 | 39.3 | 6.0 | |
| 250 × 25 | 49.1 | 6.0 | |
| 300 × 6 | 14.1 | 6.0 | |
| 300 × 8 | 18.8 | 6.0 | |
| 300 × 10 | 23.6 | 6.0 | |
| 300 × 12 | 28.3 | 6.0 | |
| 300 × 16 | 37.7 | 6.0 | |
| 300 × 20 | 47.1 | 6.0 | |
| 300 × 25 | 58.9 | 6.0 |
Got your size? Get a quote.
Quote my Flat BarYellow-dot sizes are typical stock at the Burleigh Heads yard. Other sizes available on request — usually same-week.
Finishes
How we finish it.
Standard supply is black hot-rolled. Bright (cold-rolled) flat is available for jobs that need a cleaner finish or tighter tolerances — ask when you order.
- Mild steel — black hot-rolled
- DuraGal in-line galvanised flat (common sizes)
- Hot-dipped galvanised (after fab, to AS/NZS 4680)
- Bright cold-rolled flat (on request)
Mild steel flat to AS/NZS 3679.1, Grade 250/300 typical.
Cut to length & fabricated on site.
We cut Flat Bar to your sizes on the bandsaw and fabricate from this range in the workshop — drilling, coping, welding, hole-punching. See the fabrication service →
FAQ
Common questions on Flat Bar.
- What grade is your flat bar?
- Standard mild steel flat is Grade 250 or 300 to AS/NZS 3679.1. Easy to weld, drill, bend and cut.
- Can you cut flat bar to length?
- Yes — bandsaw cuts on request. Send a cut list and we'll have it ready.
- Do you stock bright flat?
- Cold-rolled bright flat is available to order for jobs that need tighter tolerances or a cleaner mill finish. Tell us the spec and we'll quote it.
- What's the longest flat bar I can pick up?
- Standard length is 6.0m. Anything longer comes in on special order. The 6.0m bars fit on the crane truck or a long ute easily.
- Do you deliver flat bar across the Gold Coast?
- Yes — Gold Coast, Tweed Heads and Northern NSW delivery. Flat bar bundles up cleanly for the tray truck.
- What's the longest flat bar you can supply?
- Standard length is 6.0m. Longer specials available on order.
- Can you fabricate from flat bar?
- Yes — bandsaw cuts, drilling, plasma cuts and folding are part of the fab shop service. Send a sketch and we'll quote.
- How much does mild steel flat bar cost?
- Price depends on width, thickness and length. Send the list and we'll quote same day.
Useful next steps
More on Flat Bar & related work.
- Full steel size reference — every section we stock in one printable page.
- Fabrication & cut-to-length services — what we can do for you in the workshop.
- Visit the Burleigh Heads yard — directions, hours and what to expect.
- Read our guides — choosing finishes, planning fabrication and more.
Related products
Also in the yard.
Mild Steel Round Bar
Solid round — pins, shafts, axles, posts, balustrade infill. Reo bar (Rio bar) also stocked here.
View Round Bar sizes
Mild Steel Angle
Equal and unequal angle — brackets, edges, frames, supports.
View Angle sizes
Mild Steel Square Bar
Solid square — decorative work, frames, anchor stock and general fabrication.
View Square Bar sizesNeed this for a job?
Let's quote your Flat Bar.
Send sizes, a sketch or a photo and we'll get back to you — usually same day.
Sizes shown are typical stock at the Burleigh Heads yard. Other sizes available on request — call us on 07 5576 6037 or send through a list.