Tooth Profile: Pressure Angle 20°-30°, Module 0.2-2.0 mm

Component Specifications

Definition

The tooth profile on a flexspline is a precisely machined geometric pattern that engages with the circular spline in a harmonic drive system. This elliptical deformation creates a controlled meshing action that enables high-ratio speed reduction, exceptional positional accuracy, and zero-backlash torque transmission through elastic deformation mechanics.

Working Principle

The flexspline's elliptical deformation causes its teeth to engage progressively with the circular spline's teeth, creating a wave generator-induced motion that results in speed reduction ratios typically between 30:1 and 320:1 with minimal backlash.

Materials

High-strength alloy steel (AISI 4340, 4140), stainless steel (17-4PH), or specialized alloys with surface treatments (nitriding, carburizing) for wear resistance and fatigue strength.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Module	0.2-2.0 mm
Hardness	58-62 HRC
Tooth Count	100-300 teeth
Pressure Angle	20°-30°
Surface Finish	Ra 0.4-1.6 μm
Profile Accuracy	ISO 1328 Class 4-6

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 1328, DIN 3960, AGMA 2000

Parent Products

This component is used in the following industrial products

Flexspline

A thin-walled, flexible cup-shaped component in a harmonic drive that deforms elastically to transmit torque through wave generator engagement.

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Engineering Analysis

Risks & Mitigation

Fatigue failure from cyclic deformation
Wear from improper lubrication
Tooth chipping from shock loads
Backlash increase from profile wear

FMEA Triads

Trigger: Insufficient material fatigue strength
Failure: Tooth root cracking under cyclic loading
Mitigation: Use high-cycle fatigue alloys with proper heat treatment and surface hardening

Trigger: Improper profile geometry
Failure: Uneven load distribution and premature wear
Mitigation: Precision machining with profile verification and tooth contact pattern analysis

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.005 mm profile deviation, ±0.01° pressure angle

Test Method

Coordinate measuring machine (CMM) verification, tooth contact pattern analysis, backlash measurement under load

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 Tooth Profile

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

CutPro

Anshan, Liaoning, CN

Also makes: Packaging Machinery, Sheet Metal Guillotine Shear

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “Custom Tooth Profiles”
View source page ↗ cutproblades.com · checked 2026-09-05

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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 makes flexspline tooth profiles different from conventional gears?

Flexspline teeth are designed for elastic deformation and progressive engagement, enabling zero-backlash operation through elliptical deformation rather than rigid meshing like conventional gears.

How does tooth profile affect harmonic drive performance?

Profile accuracy directly impacts positional accuracy, torque capacity, and service life. Optimized profiles minimize stress concentration and ensure smooth engagement across the deformation cycle.

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.

Tooth Profile