ACME Thread Nuts

Core Info

 

Product: ACME Thread Nuts

Size: 1/2"-1"

Raw material: Q195,SWRCH35K

Surface: Plain,Zinc plated

Property: GR.2/5/8

 

Core Standard: ASME B1.5-1997, 29° American trapezoidal drive thread. It differs from the metric 30° trapezoidal thread (DIN103), and the two are not interchangeable.

Two Main Classifications
• General ACME (Series G): Tolerance grades 2G/3G/4G. Clearances are reserved at major, pitch and minor diameters for free sliding and general power transmission. Grade 2G is the most widely adopted due to maximum clearance and low risk of jamming.
• Centralizing ACME (Series C): Tolerance grades 2C/3C/4C. Centering is realized only via major diameter with high radial coaxiality, applied to precision positioning lead screws. Grade 2C is the preferred option.

Basic Thread Profile Parameters

• Thread included angle: 29°; flat crests and flat roots; thread height equals 0.5 times pitch (P).
• Marking rule: Nominal diameter - Threads per inch ACME, e.g. 1"-5 ACME.
• Single-start and multi-start designs available: Multi-start threads deliver larger lead and faster linear travel. Stub ACME (short thread profile) has half thread height, suitable for thin-wall and confined spaces.

1. High load-bearing capacity: Wide thread root eliminates sharp-angle stress concentration. Compared with same-size square threads and 60° standard triangular threads, it features superior tensile, impact and overload resistance for heavy axial loads.

2. Easy machining and maintenance: The 29° flank angle allows simple turning and rolling. Clearance compensation via nut is feasible after wear, whereas square threads are difficult to machine and cannot adjust backlash after abrasion.

3. Self-locking against reverse rotation: For single-start ACME threads, friction angle exceeds lead angle. Vertical lifting assemblies will not slide down upon power cut or shutdown without extra brakes.

4. Wear resistance and dirt tolerance: Wide thread grooves store lubricant and contain debris, preventing seizure and galling under harsh working conditions.

5. Smooth motion: Uniform load distribution on trapezoidal contact surfaces ensures steady rotation-to-linear conversion with low vibration.

1. Machine Tool Transmission (Primary Application)
2. Heavy-Duty Lifting & Clamping Devices
3. Fluid Control Valves
4. Automated Linear Actuators
5. Aerospace & Heavy Construction Machinery

We are certified by ISO9001:2015, IATF16949:2016, and other international quality standard certifications.

Long-term quality warranty and comprehensive after-sales service are provided.

Established in 2005, our company has evolved over two decades of continuous development into a leading regional enterprise in the fastener industry with fully automated end-to-end production. With an annual output value exceeding RMB 130 million, our product range covers diverse market segments from mid-range to high-end and is distributed worldwide

 

Our factory & quipment

 

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