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Gear Precision Standard Guide: DIN, ISO, AGMA & GB Cross-Reference

A systematic guide to the four global gear precision standard systems (DIN/ISO/AGMA/GB) with grade comparison tables, speed-cost relationships, proces

1. Four Precision Standard Systems Overview

Gear precision is the core indicator of transmission quality, directly affecting meshing smoothness, noise levels, load capacity, and service life. The four most widely used global standard systems are:

StandardFull NameRegionLatest VersionCore Standard
DINGerman Industrial StandardGermany/EuropeDIN 3961~3967DIN 3962 (Cyl. gear tolerances)
ISOInternational Organization for StandardizationGlobalISO 1328:2013ISO 1328-1
AGMAAmerican Gear Manufacturers AssociationNorth AmericaAGMA 2015:2009AGMA 2000-A88
GBChinese National StandardChinaGB/T 10095:2008GB/T 10095.1

Key Relationships: GB/T 10095 adopts ISO 1328 with modifications; DIN 3962 and ISO 1328 are highly consistent. DIN/ISO/GB are interchangeable in parameter definitions. Only AGMA uses a different grading logic.

2. Precision Grade Comparison Table

2.1 Cylindrical Gear Precision Grade Cross-Reference

DIN GradeISO 1328GB/T 10095AGMA 2000Typical ProcessTypical Application
DIN 3ISO 3GB 3AGMA 15Precision grindingAerospace, high-speed, precision indexing
DIN 4ISO 4GB 4AGMA 14Precision grindingAuto transmission, precision machine tools
DIN 5ISO 5GB 5AGMA 13Grinding/fine hobbingAutomotive, general gearboxes
DIN 6ISO 6GB 6AGMA 11~12Hobbing + shavingGeneral industrial gearboxes
DIN 7ISO 7GB 7AGMA 10HobbingAgricultural, crane machinery
DIN 8ISO 8GB 8AGMA 8~9HobbingLow-speed, non-critical drives
DIN 9~12ISO 9~12GB 9~12AGMA 4~7Rough cutting/castingManual, low precision

Geyontech Batch Capability: Batch production GB 45 (≈ DIN 45), precision grinding up to DIN 3 (≈ AGMA 15).

2.2 Precision Grade vs. Speed

GradeMax SpeedNoise LevelCost Multiplier (hobbing=1.0)
DIN 3> 35 m/sVery low×5.0~8.0
DIN 425~35 m/sLow×3.0~5.0
DIN 515~25 m/sMedium-low×2.0~3.0
DIN 610~20 m/sMedium×1.5~2.0
DIN 75~15 m/sMedium-high×1.2~1.5
DIN 8< 10 m/sHigh×1.0 (baseline)
DIN 9< 5 m/sVery high×0.8~1.0

3. Key Precision Parameters Explained

3.1 Pitch Accuracy (Running Smoothness)

  • Single Pitch Deviation (fpt/fp): Adjacent tooth pitch variation → meshing impact noise
  • Total Cumulative Pitch Deviation (Fp): Max pitch error across circumference → angular velocity fluctuation — the most critical parameter
  • Engineering rule: Fp ≤ 0.5×module (μm) for general machinery; precision drives require Fp ≤ 25 μm

3.2 Tooth Profile Accuracy (Load Capacity)

  • Total Profile Deviation (Fα): Actual profile vs. theoretical involute → contact stress distribution
  • Profile Form Deviation (ffα): Curvature deviation → micro-noise excitation

3.3 Helix Accuracy (Axial Meshing)

  • Total Helix Deviation (Fβ): Actual tooth trace vs. theoretical → tooth load distribution — main cause of misalignment

3.4 Radial Runout (Fr)

  • Eccentricity of gear ring relative to bore → periodic noise and vibration

4. Precision Grade vs. Process Chain

Target GradeRecommended Process RouteKey EquipmentGeyontech
DIN 3~4Hobbing → Carburizing → Precision grindingWorm/form grinding machine✅ DIN 3
DIN 5~6Hobbing → Carburizing → GrindingCNC grinder✅ GB 4~5 batch
DIN 6~7Hobbing → Shaving or post-HT grindingShaver/grinder✅ Stable mass production
DIN 7~8Precision hobbingHigh-precision hobbing machine✅ Up to 5 sec/tooth
DIN 8~9Standard hobbingStandard hobbing machine✅

5. Export Market Precision Standards Guide

5.1 Europe (DIN/ISO)

  • Recommended: DIN 57 (general), DIN 34 (precision)
  • Documents: Full inspection report (Fp/Fα/Fβ/Fr), material cert, heat treatment report
  • Key concern: Surface roughness (Ra ≤ 0.8 μm), tooth burn inspection

5.2 North America (AGMA)

  • Recommended: AGMA 1113 (general), AGMA 1415 (precision)
  • Documents: Contact pattern check, noise test
  • Note: Imperial DP (DP = 25.4/m) — watch DP/metric conversion

5.3 Southeast Asia / Middle East

  • Reference: DIN/ISO, some follow JIS
  • Recommended: DIN 6~8, cost-performance priority
  • Note: Shipping protection (anti-rust + soft tooth separators)

5.4 Precision Selection Decision Tree

Speed / Load / Noise requirements
    ├─ High speed >25m/s + Low noise → DIN 3~4 / AGMA 14~15 → Grinding
    ├─ Medium-high 15~25m/s → DIN 5~6 / AGMA 11~13 → Grinding/precision hobbing
    ├─ Medium 5~15m/s → DIN 6~7 / AGMA 10~11 → Hobbing+shaving
    └─ Low <5m/s → DIN 8~9 / AGMA 7~9 → Standard hobbing

6. Common Misconceptions

❌ Myth✅ Fact
Higher precision is always betterEach grade adds 50~100% cost. Choose adequate, not highest
DIN/ISO/GB are directly interchangeableParameters match, but DIN 3 tolerances are slightly stricter than ISO 3
AGMA higher number = higher precision✅ Correct (AGMA 15 highest), but AGMA 15 ≠ DIN 7 — it equals DIN 3
Hobbing can replace grinding for DIN 4Hobbing limit ≈ DIN 4, but post-HT deformation requires grinding

7. Geyontech’s Precision Capability

ItemCapability
Batch precisionGB 4~5 (consistent)
Max grindingDIN 3
Full inspectionGear measuring center + CMM + meshing tester
Fp≤ 25 μm (DIN 5)
Fα≤ 10 μm (DIN 4~5)
Fβ≤ 10 μm (DIN 4~5)
Fr≤ 15 μm
Ra≤ 0.8 μm (grinding), ≤ 0.4 μm (superfinish)
Report formatsDIN / ISO / AGMA / GB
CertificationsCE / CSA / BV / SGS / UL

13 years of gear industry experience. Geyontech’s engineering team provides precision grade recommendations at the quotation stage — matching the most cost-effective grade combination to your export destination, speed, load, and noise requirements.

8. Summary

ScenarioStandardGradeProcessCost
Export Europe, precision machinesDINDIN 3~5Hobbing+grinding★★★★~★★★★★
Export North America, auto drivesAGMAAGMA 13~15Hobbing+grinding★★★★
General industry, SE AsiaISO/DINDIN 6~7Hobbing+shaving★★~★★★
Low-speed, non-criticalGBGB 8~9Standard hobbing★

Contact us with your application parameters (power, speed, ratio, export destination) — Geyontech’s engineering team delivers a precision proposal and quotation within 24 hours.

Geyon Transmission Technology Co., Ltd. — Precision Gear Manufacturing & Transmission Components Export 📧 info@geyontech.com | 🌐 geyontech.com