Lead Screws Machining Services

ACME vs Trapezoidal Lead Screws: A Comparison Guide

Two lead screws thread forms with different strengths. Both precision-machined in Singapore to your exact specification.

ACME vs Trapezoidal Lead Screws: Comparison At-a-Glance

FeatureACME Lead ScrewsTrapezoidal Screws
Thread Angle29°30° (ISO standard)
Profile ShapeWider, strongerNarrower, efficient
EfficiencyLower (~30-50%)Higher (~40-60%)
Self-Locking✓ Yes (single-start)Limited
Best ForHeavy loads, manual operation, vertical liftingMotorized drives, CNC machines, automation
StandardANSI/ASMEDIN 103 (ISO metric)
Typical ApplicationsPresses, vises, jacks and clampsLinear actuators, positioning systems
What are ACME Lead Screws?

Thread Profile

The ACME thread has a 29° included angle, giving it a wide, flat thread form that distributes load across a larger contact area than standard V-threads. This makes it ideal for applications where axial force — not speed — is the primary requirement.

Unlike ball screws, ACME lead screws are inherently self-locking under most conditions, meaning the load will not back-drive the screw if the drive motor is switched off. This is critical in vertical lifting or clamping applications.

TNL Engineering Works Pte Ltd machines ACME threads to DIN/ANSI standards or fully to your drawing — including non-standard pitches, multi-start configurations, and combined profiles on the same shaft.

Right for your Application?

▪  Industrial Presses and Vises

High axial clamping force, intermittent duty, self-locking when stopped. ACME is the thread of choice.

▪  Lifting and Positioning Jacks

Where loads must be held without continuous motor power. Self-locking prevents back-driving.

▪  Offshore & Subsea Equipment

Corrosion-resistant alloy ACME screws for harsh environments. Super duplex and CRA grades available.

ACME Capability Range

Lead screws at 29° standard ACME thread angle profile, machined to your drawing (complete with journals, keyways, cross-holes and other end features), and suited to your unique application.

Outer Diameter

10 – 200 mm.

Confirm with us for lead screws of diameters above 150mm.

Max Length

Up to 1,500 mm.

Longer lengths subject to deflection review.

Lead Time

Est. 5 – 10 days, subject to job complexity.

Rush orders considered.

What are Trapezoidal Lead Screws?

Thread Profile

The trapezoidal thread follows the ISO metric standard (DIN 103), with a 30° included angle — 1° narrower than ACME. This seemingly small difference gives the trapezoidal profile a higher mechanical efficiency, meaning less torque is required to move the same load at the same speed.

It is the dominant lead screw form in European-designed machinery, CNC machine tools, and precision automation equipment. If your machine was designed in Europe or manufactured to metric standards, it almost certainly uses a trapezoidal lead screw.

TNL Engineering Works Pte Ltd machines trapezoidal threads to DIN 103 or fully to your drawing — including non-standard pitches, multi-start configurations, and end-journal machining on the same part.

Right for your Application?

▪  CNC Machine Replacement

Worn Tr-series lead screws on lathes, mills, or EDM machines. We machine to match your existing nut or supply both.

▪  Industrial Automation

Actuators, gantries, and linear stages. Trapezoidal is efficient enough for motorised drives without the cost of a ball screw.

▪  Offshore & Subsea Equipment

Super duplex and CRA trapezoidal screws for valve actuators and subsea equipment in corrosive environments.

▪  Precision Instruments

Fine-pitch single-start screws for optical tables, lab equipment, and medical devices where positioning accuracy matters.

Trapezoidal Capability Range

Tr [diameter] × [pitch] — e.g. Tr 20×4 lead screws at 30° ISO metric standard profile, machined to your drawing and configured to your required travel speed and load.

Outer Diameter

8 – 200 mm.

Confirm with us for lead screws of diameters above 150mm.

Thread Starts

Single to quad-start (1 – 4).

Multi-start increases lead (i.e. linear advancement per revolution).

Lead Time

Est. 5 – 10 days, subject to job complexity.

Rush orders considered.

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