Rebar Stirrup Bending Machine: Complete Buyer Guide

Rebar Stirrup Bending Machine: Complete Buyer Guide

Stirrups are the highest-volume bent part on most reinforced concrete jobs. A mid-size project can consume tens of thousands of rectangular, square, and triangular stirrups, and every one of them has to be cut, bent to closed shape, and hooked consistently. This guide covers what actually drives stirrup production cost, and how to choose between single-head and five-head stirrup bending machines using real machine specifications.

What Determines Stirrup Output

Four variables set your real hourly rate, not the machine's catalog speed:

• Bar diameter and grade: A machine rated for 25mm round steel will run 8mm stirrups far faster than 20mm. Always size the machine for your heaviest recurring bar, not your average.
• Stirrup geometry: Rectangular stirrups with four bends and two hooks are the baseline. Triangles, spirals, and unequal-leg shapes add handling time per piece.
• Feeding method: Manual feeding dominates cycle time on single-head machines. Automatic feeding and double-line capability change the economics entirely.
• Cutting and straightening upstream: If your bar arrives coiled, the straightening and cutting step feeds the bender. A mismatch here creates idle time at the bender.

Single-Head Stirrup Bending Machines: GW25

The GW25 is a CNC single-head stirrup bender handling round steel up to 25mm. It is the standard entry point for workshops producing stirrups in batches where shapes change frequently. Setup is done through the CNC control, so switching from a 400×400 rectangular stirrup to a 300×600 beam stirrup takes minutes rather than a tooling change.

Practical strengths of the single-head format:

• Lower capital cost and smaller footprint than multi-head machines
• Fast changeover for high-variety, low-volume production
• Simple maintenance — one bending head, one set of tooling
• Well suited to site-adjacent fabrication and smaller rebar shops

The trade-off is throughput. On a single-head machine, one stirrup is completed per cycle, and the operator loads each bar. For a shop running 8mm to 12mm stirrups in the thousands per day, this becomes the bottleneck.

Five-Head Stirrup Machines: ZD-6M-25 and ZD-6M-20

Five-head machines bend multiple stirrups simultaneously. The ZD-6M-25 handles up to 25mm bar, and the ZD-6M-20 handles up to 20mm. Both are built for continuous, repetitive stirrup production where the same or similar shapes run for hours.

Where five-head machines win:

• Output per operator hour: Multiple stirrups per cycle instead of one. For a project needing 5,000 identical 10mm stirrups, the difference is measured in shifts, not hours.
• Consistency: Simultaneous bending from a common control means every stirrup in the group matches. This matters for cover and fit-up on site.
• Labor cost per piece: One operator supervises a five-head machine producing what would otherwise require several single-head machines and several operators.

Where they do not win: short runs and constant shape changes. If your average batch is 50 stirrups and the shape changes every hour, the setup and handling overhead of a five-head machine erodes its advantage.

Matching the Bender to the Rest of the Line

Stirrup production does not stop at the bender. A coherent line for a stirrup-focused shop typically looks like this:

• Straightening and cutting: The YGT4-15A handles 4–15mm bar with a variable frequency drive, giving controlled feed speed into the bender. For heavier stock, the GDQX-500 hydraulic shearing production line or the GQ70A cutting machine (70mm capacity, 160-ton shear force) covers the cutting stage.
• Bending: GW25, ZD-6M-25, or ZD-6M-20 depending on volume and diameter.
• Special shapes: For curved and arc stirrups, the GWH50CG/GWH50CZN arc bending machine (50mm) or the CNC arc benders SKDZWH-36/GDWHWQ-36 (36mm) handle radii that a standard stirrup bender cannot.
• Larger formed parts: The GJZD6-50CZ CNC bending machine (up to 50mm, 420mm working table) and GJZD6-65CZ (up to 65mm) cover heavier bending work, while the GDPMW-60 plane bending center (60mm) and GDLWZX-32 vertical bending center (32mm) handle complex formed rebar.

Sizing the straightener and cutter to feed the bender continuously is often worth more than upgrading the bender itself.

Cost Analysis: What to Compare

Compare machines on cost per finished stirrup, not purchase price. Build a simple model:

• Cycle time per stirrup at your actual bar diameter and shape
• Stirrups per operator hour — this is the number that pays wages
• Setup time per shape change multiplied by your daily shape changes
• Power draw and tooling wear over a year of production
• Downtime risk — availability of spares and service response

A single-head GW25 at a lower price can be the correct choice for a shop with high shape variety. A five-head ZD-6M-25 or ZD-6M-20 usually pays back faster on repetitive, high-volume stirrup work, because the labor saved per piece compounds across thousands of units.

Export, Certification, and Support

Gongda machines are manufactured in Hefei, Anhui, China, with the factory rooted in the electromechanical works of Hefei University of Technology. Equipment ships to Russia, Spain, Latin America, the Middle East, Southeast Asia, and Africa. EAC certification is available for Russian and Eurasian Economic Union markets — confirm this before ordering if you are importing into that region, since it affects customs clearance.

For model selection, capacity confirmation against your bar schedule, and shipping quotes, contact the export team directly:

• WhatsApp: +86 193 9277 7259
• Email: yuhua0095@gmail.com

Send your stirrup list — diameters, shapes, and quantities per month — and you will get a machine recommendation with realistic output figures rather than catalog maximums.