Rebar Roll Threading machine

Rebar Roll Threading Machine

The roll threading machine is one step in a short production line. Before you order, count the other steps, because the machine only pays off when the saw, the gauges, the proof load rig and your operators are ready for it.

Surya Engineering, a rebar roll threading machine manufacturer in Mumbai, supplies two models for bars from 16 mm to 40 mm: the CDRG-45 and the SE-50. This page walks through what you need to decide before you buy either one.

How Does a Rebar Roll Threading Machine Work?

A Roll Threading Machine works by applying controlled pressure through specially designed rolling dies to form threads on the prepared reinforcement bar.

The general working process involves:

1. Bar Preparation: Cut the TMT reinforcement bar to the required length using an appropriate cutting method.
2. End Preparation: Prepare the bar end according to the selected threading and coupler system. Some configurations require rib peeling before rolling.
3. Bar Positioning: Place and secure the reinforcement bar inside the machine.
4. Thread Rolling: The machine applies pressure through hardened rolling dies to form the required thread profile.
5. Thread Inspection: Check the finished thread dimensions using suitable GO and NO GO gauges.
6. Coupler Installation: Connect the prepared bar to a compatible threaded rebar coupler according to the coupler manufacturer's installation instructions.

What you're actually buying

IS 16172:2023 lays out the minimum process for threading bars at site, and it doubles as a shopping list. Bar ends must be saw cut or square cut, so you need a saw, because disc cutting and gas cutting are banned. After threading, GO and NO GO gauges check the major diameter of parallel threads.

Then every threaded end takes a proof load of at least 80 percent of the bar's minimum specified yield strength, on a rig that punches its own mark on bars that pass. Plastic caps protect the threads afterwards.

So a quote for the threading machine alone leaves out a saw, a gauge set, a proof load rig and caps. Ask every seller what's included, and compare prices only between machines with the same bar range, thread length, motor and tooling.

Key Features of Surya Engineering Rebar Roll Threading Machine

• Wide Processing Range: Designed to process TMT reinforcement bars ranging from 16 mm to 40 mm.
• Precision Thread Formation: Produces parallel rolled threads for compatible mechanical rebar coupler systems.
• Cold Rolling Technology: Forms threads through controlled pressure rather than removing material through conventional thread cutting.
• Heavy-Duty Construction: Designed for industrial reinforcement processing and regular fabrication operations.
• Multiple Machine Models: Available in CDRG-45 and SE-50 configurations to suit different threading requirements.
• Consistent Threading: Helps achieve repeatable thread dimensions when operated with the correct tooling and settings.
• Construction Applications: Suitable for rebar preparation in building, bridge, metro, infrastructure and fabrication projects.

Technical Specifications

Surya Engineering offers two Roll Threading Machine models:

Is a Rebar roll threading machine right for your project?

A review of mechanical splices in STRUCTURE magazine gives an honest answer. Threading needs skilled operators and extra equipment, and the cost of couplers can cancel the saving over laps. The review also finds that the advantage of couplers grows with bar size.

In practice, couplers earn their place where there's no room for laps, where reinforcement is congested, where bars are large and where walls sit in seismic zones. If your bars are small and your sections roomy, lapping may still be cheaper.

Reading the spec sheet

Both models process 16 mm to 40 mm bars and list a thread pitch of 2.5 mm or 3.0 mm. Your coupler drawing decides the pitch, and the standard leaves thread length and depth to the coupler maker.

The CDRG-45 has a 5 HP motor running at 40 to 62 rpm, a threading length of 100 mm and a weight of 380 kg. The SE-50 has a 7.5 HP motor at 62 to 80 rpm, a threading length of 120 mm and a weight of 450 kg. Check the threading length against your coupler first, because the standard tests couplers with 15 percent of the total thread length outside the coupler, and that margin depends on consistent thread length.

Weight matters too, since a 380 kg or 450 kg machine needs a plan for unloading.

Questions to ask any seller, including us

• Does the machine strip the bar's rib before rolling? Many rib peeling thread rolling machines do, and IS 16172:2023 asks designers to consider the effect of reduced bar diameter at the threaded end.
• What voltage and phase does it need? Confirm this against your supply before you order.
• How often do the rolling parts wear out, and what do replacements cost?
• Which machine did your coupler supplier use in its type test reports? The standard applies type tests again when the threading machine changes.
• Can I run a trial on my own bars and my own coupler?

Benefits of Using a Roll Threading Machine

• Produces parallel threads for compatible rebar couplers.
• Forms threads through a cold-working process.
• Reduces conventional thread-cutting material removal.
• Supports mechanical splicing of reinforcement bars.
• Helps reduce reinforcement congestion compared with overlapping bars.
• Supports better utilisation of reinforcement lengths where mechanical splicing replaces lap lengths.
• Provides consistent thread production when correctly configured and maintained.
• Suitable for different construction and infrastructure applications.

Getting ready for delivery

Settle the power supply and the unloading plan first. Then decide who will run the machine. The STRUCTURE review says threading may need skilled labour, so a short session with gauges on your own bars is worth arranging.

Plan for the finished bars too. Threaded ends need protection from corrosion before installation, which is what the caps are for, and cover shrinks at the splice because couplers are wider than the bar. Your detailer should allow for that.

CDRG-45 or SE-50

Choose by thread length first. The CDRG-45 lists 100 mm and the SE-50 lists 120 mm. After that, compare motor power, speed and weight against the volume of bar ends you thread and the space you have.

What to send us

Send your bar sizes, the pitch and thread length from your coupler drawing, your site supply and how many bar ends you thread a day.

If your coupler supplier has already named a machine in its test reports, start there and ask us which of the two matches it.

Roll Thread Machine - FAQs

• Is Rebar roll threading the same as thread cutting?

  No. Roll threading forms threads through pressure, while thread cutting removes material.

• Is cold forging always required?

  Not necessarily. It depends on the selected coupler and threading system.

• Can it process all TMT bar sizes?

  The listed models support 16–40 mm bars.

• Which thread pitch is available?

  2.5 mm and 3.0 mm, subject to coupler requirements.

• Which model should I choose?

  Select based on required thread length, production requirements and coupler specifications.