Threads: Surface Finish Ra 0.8μm to 3.2μm

Component Specifications

Definition

Threads are continuous helical ridges machined onto the surface of cylindrical components like lead screws or piston rods. They serve as mechanical interfaces that convert rotational torque into linear force through mating with corresponding internal threads (nuts) or threaded holes. In industrial applications, threads provide precise positioning, load transmission, and secure fastening in mechanical assemblies.

Working Principle

Threads operate on the inclined plane principle, where the helical ridge acts as a ramp wrapped around a cylinder. When rotational force is applied, the thread's pitch (distance between adjacent ridges) determines the linear displacement per revolution. This mechanical advantage allows controlled movement and force transmission in systems like linear actuators, presses, and positioning devices.

Materials

Typically manufactured from alloy steels (AISI 4140, 4340), stainless steels (304, 316), or hardened tool steels. Surface treatments include zinc plating, black oxide coating, or chromium plating for corrosion resistance and wear protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pitch	0.5mm to 10mm (metric), 4 to 32 TPI (imperial)
Thread Type	Metric (M), Unified (UNC/UNF), Acme, Buttress
Load Capacity	Up to 500 kN static, 200 kN dynamic
Diameter Range	M6 to M100 (metric), 1/4" to 4" (imperial)
Surface Finish	Ra 0.8μm to 3.2μm
Tolerance Class	4H/6H (internal), 4g/6g (external)

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 68-1, ISO 965, DIN 13, ASME B1.1

Parent Products

This component is used in the following industrial products

Lead Screw or Piston Rod

A linear motion component that converts rotary motion into precise linear displacement within an adjustment actuator.

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Engineering Analysis

Risks & Mitigation

Thread stripping under excessive load
Gallling in stainless steel threads
Backlash causing positioning errors
Corrosion in harsh environments

FMEA Triads

Trigger: Incorrect thread engagement or over-torquing
Failure: Thread stripping or shearing
Mitigation: Use torque wrenches, follow manufacturer specifications, implement thread locking compounds

Trigger: Insufficient lubrication
Failure: Increased wear and galling
Mitigation: Apply appropriate anti-seize compounds, establish regular maintenance schedules

Trigger: Material fatigue from cyclic loading
Failure: Crack propagation leading to thread failure
Mitigation: Use fatigue-resistant materials, implement regular inspection protocols, design with adequate safety factors

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05mm for pitch diameter, ±0.1° for thread angle

Test Method

Thread plug gauges, optical comparators, coordinate measuring machines (CMM), torque testing

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Threads

Manufacturer profiles associated with Threads.

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Frequently Asked Questions

What is the difference between Acme threads and metric threads?

Acme threads have a trapezoidal profile with 29° flank angles, designed for power transmission with high efficiency and load capacity. Metric threads have triangular profiles (60° flank angles) optimized for general fastening applications.

How do I select the right thread tolerance for precision applications?

For precision positioning systems, use tolerance classes 4H/4g for minimal backlash. For general industrial applications, 6H/6g provides adequate clearance while maintaining functionality. Consider lubrication and thermal expansion in tolerance selection.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Threads