Thread rolling

For example, machines for rolling up to 40 full threads with lengths of up to 600 mm on screw blanks

Produced with this machine

Fully threaded screws up to 600 mm

Thread rolling machine

Rolls up to 40 full threads

Technical innovations make mechanical engineering one of the most exciting areas of industrial manufacturing. In the thread rolling segment, AMBA also relies on maximum precision, efficiency, and durability using the cold forming process for thread rolling.

With the wide-die thread rolling machine BBW, we present a machine that sets new standards in performance, speed, and quality.

The multi-talent among thread rolling machines

40 pcs/min

The highest production speed for threads up to 600 mm in length.

13 mm diameter

A combination of speed, force, and precision.

No material loss

Exceptionally high strength.

Efficient

Fast and precise in production.

Thread rolling and its advantages – Cold forming instead of cutting

Thread rolling is a cold forming process that offers significant advantages over material-removing methods such as thread cutting. During rolling, no material is removed. The workpiece is plastically deformed under high pressure between two dies, forming the desired thread shape through deformation.

“In contrast to cutting, our machines produce no material loss, and the resulting threads have an exceptionally smooth surface and increased strength. This is due to work hardening during the process, which densifies and aligns the material’s fiber structure.”

Principles & Innovations

Central operator panel

Simple setup of the process.

Low maintenance

Central lubrication system for sliding bearings.

Large dimensions

Threads up to 600 mm in length and 13 mm in diameter.

Fully automatic operation

Feeding and discharge possible with optional extensions such as automatic feeding systems.

An overview of our Solutions

Quality, precision, and experience

AMBA thread rolling machines are designed for durability, robustness, and maximum performance. Each machine is individually tailored to the customer’s products and is designed and manufactured in-house.

With the BBW thread rolling machine, we are introducing a machine that sets new standards – in performance, speed, and quality.

By using flat dies for cold forming, the machine can produce up to 40 full threads per minute. Threads up to 600 mm in length and 13 mm in diameter can be manufactured with outstanding accuracy. This combination of speed, size capability, and precision makes the BBW one of the most powerful rolling machines in its class.

Our technology is based on decades of experience in mechanical engineering and the manufacture of components for demanding applications.

AMBA is currently the only manufacturer worldwide producing rolling machines of this size in series production. Therefore, the BBW thread rolling machine is a unique solution for companies that require high throughput and consistent thread quality in a single system for their production line.

The right machine for your operation

We offer custom project development, personal consultation, and reliable delivery with a focus on efficiency, precision, and quality.

Unlike conventional machining, our machines produce no material loss. The resulting threads have a smooth surface and increased strength. This is due to work hardening, which occurs during the process and compacts and aligns the material’s fiber structure. This ensures excellent durability and load-bearing capacity, which are critical properties for fasteners in safety-critical applications.

Furthermore, thread rolling is characterized by extremely high efficiency.

Processing times are reduced and the number of parts that can be produced per minute increases. Additionally, the dies used for our applications have a long service life. The robust and stable process produces threads with excellent dimensional accuracy.

The consistent quality of the surfaces extending into the thread flanks makes the connections particularly secure.

In industrial manufacturing, thread rolling is therefore the best method for producing external threads with high precision, consistent quality, and optimal performance.

Introducing the Wide-Die thread rolling machine

The BBW wide-die thread rolling machine can roll up to 40 fully threaded screws with lengths up to 600 mm on screw or bolt blanks. AMBA is the only company worldwide producing machines for screws of this size with such cycle times.

Safe connections for timber construction

Bolts and fasteners made from threaded round bars are used predominantly in constructions with glued laminated timber, also called glulam. As the threads extend over the complete length of the bolts, these fasteners guarantee safe and durable bonding between the laminated layers. They comply with applicable safety regulations stipulating that glulams have to be fastened with full-thread bolts under all circumstances.

The technology

The rolling unit of the BBW thread rolling machine is equipped with wide-jaw dies in the sizes WF #40, WF #50, TR6, or TR7.

The upper die is mounted in the movable slide of the machine, while the lower die is positioned in a vertically adjustable die holder. A hydraulic clamping system with two parallel cylinders ensures secure positioning of the dies during operation.

The space-saving design of our machine is achieved, among other things, by integrating the entire drive system above the machine.

A self-locking worm gear integrated into the clutch-brake system enables smooth die adjustment even at low speed. This allows the operator to align the dies precisely while the machine runs in creep mode.

The robust O-frame construction of the machine can withstand axial forces of up to 100 tons during the rolling process.

This structural stability ensures uniform deformation of the material and guarantees precise thread geometry.

Machine, Process & Result

3 Steps – One machine

Wire Feeding

Controlled feeding of screw blanks with lengths from 250 – 700 mm.

Thread Rolling

High-precision rolling of threads up to 600 mm.

Discharge

Organized depositing of screw blanks into transport bins.

Detailed Specifications

Wire Diameter

Up to 13 mm

Shank Length

Up to 700 mm

Output

Up to 40 pcs/min

Accuracy

±0.05 mm

Drive System

Mechanically coupled

Control System

PLC with HMI touch panel

Materials

Steel, stainless steel, titanium

Surface Finish

Ra < 0,8 µm

Frequently Asked Questions

What does a thread rolling machine do?

A thread rolling machine forms threads not by cutting, but by rolling. The part is deformed between two profiled flat-dies, creating the thread shape. This process enables highly precise production with strong, smooth threads. Unlike thread cutting, material usage is lower, and the dies have a significantly longer service life.

Which standards apply to thread rolling?

Rolled profiles are subject to various international standards, including ISO and DIN. These define dimensions, tolerances, and surface quality of the threads produced. AMBA aligns its thread rolling machines strictly with these standards, ensuring that all threads meet the highest industrial requirements and can be used across different industries worldwide.

Which products are thread rolling machines suitable for?

The BBW thread rolling machine is ideal for producing long fully threaded screws, bolts, turned parts, and other components with large lengths and diameters. This sets us apart from other providers. In timber construction, AMBA BBW machines are used to produce fully threaded screws required for load-bearing structures. They are also advantageous in industrial applications where high strength and precise surface quality are critical.

What makes the BBW Wide-Die thread rolling machines special?

The uniqueness of our thread rolling machines lies in the wide dies and robust construction. The BBW can roll up to 40 fully threaded parts per minute with threads up to 600 mm long and 13 mm in diameter. This design ensures maximum efficiency, consistent quality, and top performance. AMBA thread rolling machines are the ideal choice for manufacturers producing large volumes with consistent precision and minimal effort.