Threaded Features: Surface Finish Ra 0.8 μm to 3.2 μm

Component Specifications

Definition

Threaded features are mechanical elements consisting of helical ridges (threads) formed on the external surface of a shaft (external thread) or the internal surface of a hole (internal thread). They are fundamental to assembly, motion control, and load transfer in precision machined components, enabling secure connections, precise positioning, and mechanical advantage through screw mechanisms. These features are manufactured to exacting tolerances to ensure reliability and interchangeability in industrial applications.

Working Principle

Threaded features operate on the screw principle, where rotational motion is converted into linear motion or vice versa. When a threaded component (e.g., a bolt) is rotated relative to a mating thread (e.g., a nut), the helical geometry causes axial displacement, creating clamping force for fastening or enabling controlled linear movement. The thread profile (e.g., V-thread, square thread) determines mechanical properties such as load capacity, self-locking ability, and efficiency.

Materials

Common materials include carbon steel (e.g., AISI 1045), alloy steel (e.g., AISI 4140), stainless steel (e.g., 304, 316), aluminum alloys (e.g., 6061), brass, and titanium alloys. Material selection depends on requirements for strength, corrosion resistance, weight, and cost.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pitch	0.5 mm to 6 mm (metric), 4 to 80 TPI (unified)
Diameter	M3 to M100 (metric), #0 to 4 inches (unified)
Hardness	20 HRC to 45 HRC (steel), varies by material
Thread Type	Metric (ISO), Unified (UNC/UNF), Acme, Buttress
Thread Class	4H/5H (internal), 4g/6g (external) per ISO 965
Surface Finish	Ra 0.8 μm to 3.2 μm

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

Precision Machined Components

Precision CNC machined components are drawing-controlled parts made by milling, turning, grinding or EDM for assemblies requiring repeatable fit and finish.

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Engineering Analysis

Risks & Mitigation

Thread stripping due to over-torque
Galling in stainless steel threads
Corrosion in harsh environments
Misalignment causing cross-threading
Fatigue failure under cyclic loads

FMEA Triads

Trigger: Incorrect thread machining tolerances
Failure: Poor fit leading to loosening or seizing
Mitigation: Adhere to ISO 965 thread class specifications; implement quality checks with thread gauges.

Trigger: Inadequate material strength for applied loads
Failure: Thread shear or deformation
Mitigation: Select materials based on stress calculations; use alloy steels or higher-grade fasteners for critical applications.

Trigger: Lack of lubrication during assembly
Failure: Increased friction and galling
Mitigation: Apply anti-seize compounds or lubricants compatible with thread materials and operating conditions.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thread dimensions per ISO 965 classes (e.g., 6g for external threads, 6H for internal threads) with typical tolerances of ±0.05 mm on pitch diameter.

Test Method

Verification using thread plug gauges (GO/NO-GO), optical comparators, or coordinate measuring machines (CMM) to check thread form, pitch, and major/minor diameters against ISO/DIN standards.

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 Threaded Features

Manufacturer profiles associated with Threaded Features.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What are the main types of threaded features used in machinery?

Common types include metric threads (ISO standard), unified threads (UNC/UNF for North America), Acme threads for power transmission, and buttress threads for high axial loads. Selection depends on application requirements like load, precision, and regional standards.

How are threaded features manufactured in precision components?

They are typically produced via machining processes such as threading (using taps and dies), thread milling, or thread grinding for high precision. CNC machining ensures consistent thread geometry and tolerances as per ISO or DIN standards.

What factors affect the performance of threaded features?

Key factors include thread profile accuracy, material strength, surface finish, lubrication, and proper installation torque. Non-compliance with standards can lead to thread stripping, galling, or premature failure.

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.

Threaded Features