Resources
Every standard cited anywhere in this library, what each one actually governs, and where the publishing body sells it. We link to the catalogue entry and never to a copy — standards texts are copyright, and reproducing them is not something a manufacturer-published site gets to do casually.
Standards register
The most useful column below is scope. Of the 18 documents cited here, 5 govern a component — a bore, a keyway, a seal, a spline — and not the coupling. They appear on coupling drawings constantly, and a specification written as though they governed the whole product is a specification that cannot be satisfied.
AGMA
ANSI/AGMA 9000-D11
PracticeFlexible Couplings — Potential Unbalance Classification
Classifies potential unbalance from coupling mass, speed and system sensitivity, and sets the threshold above which dynamic balancing is required.
Used in: How to size a gear coupling →Publisher's catalogue entry ↗
ANSI/AGMA 9001-C18
PracticeFlexible Couplings — Lubrication
Lubrication of gear, chain and metallic grid couplings: methods, practices, and the CG-1 / CG-2 / CG-3 coupling grease classes. Revises 9001-B97.
ANSI/AGMA 9002-B04
Component onlyBores and Keyways for Flexible Couplings (Inch Series)
The bore tolerance and keyway practice most catalogue couplings are dimensioned to. It governs the shaft interface only — not the coupling.
ANSI/AGMA 9003-C17
Component onlyFlexible Couplings — Keyless Fits
Design, tolerances, mounting and removal for keyless tapered and straight bore hubs, including the pressure and stress calculations for the fit.
ANSI/AGMA 9008-B00
Component onlyFlexible Couplings — Gear Type — Flange Dimensions, Inch Series
Flange dimensions for gear-type couplings, which is what makes the bolted joint between a sleeve and a rigid hub interchangeable between suppliers.
AGMA 922-A96 (R2025)
Information sheetLoad Classification and Service Factors for Flexible Couplings
Classifies the character of the load by driven machine and prime mover, and gives the service factors industrial selection practice is built on. An information sheet — it states that manufacturer recommendations govern where its values do not apply.
Used in: Service factor guide →Publisher's catalogue entry ↗
ANSI/AGMA 1010-F14
Information sheetAppearance of Gear Teeth — Terminology of Wear and Failure
The nomenclature for describing tooth wear and failure modes, with photographic examples. It is the vocabulary a failure report should be written in.
ISO
ISO 14691:2008
Whole couplingPetroleum, petrochemical and natural gas industries — Flexible couplings for mechanical power transmission — General-purpose applications
General-purpose flexible couplings in petroleum and process service. The general-purpose counterpart to ISO 10441.
ISO 10441
Whole couplingPetroleum, petrochemical and natural gas industries — Flexible couplings for mechanical power transmission — Special-purpose applications
The special-purpose counterpart to ISO 14691. The boundary between the two is service criticality, not coupling type.
ISO 286-1:2010
PracticeGeometrical product specifications (GPS) — ISO code system for tolerances
The metric limits-and-fits system underlying bore tolerances on metric drawings. Explains why an inch-series bore call-out cannot simply be converted.
ISO 1940-1:2003
PracticeMechanical vibration — Balance quality requirements for rotors in a constant state
Balance quality grades (the G-numbers) referenced when a coupling balance requirement is specified in ISO rather than AGMA terms.
Bureau of Indian Standards
IS 3238
Whole couplingGear couplings
Gear couplings as a complete product, in metric fit conventions. The document Indian tender specifications name, and frequently the one that decides whether a delivery is accepted.
DIN
DIN 3761
Component onlyRotary shaft lip type seals
Radial shaft seal practice. Cited on many coupling drawings, where it governs the seal and nothing else.
DIN 5480
Component onlyInvolute splines based on reference diameters
Involute splined shaft-hub connections. A shaft interface standard, not a coupling standard.
DIN 740-2
Whole couplingFlexible shaft couplings — Parameters and design principles
Parameters and design principles for flexible (elastomeric) shaft couplings — the document behind the torsional stiffness and damping figures quoted for elastomeric elements.
API
API 686 (2nd ed., 2009)
PracticeRecommended Practice for Machinery Installation and Installation Design
Machinery installation practice. Chapter 7 covers shaft alignment: soft foot, pipe strain, reverse dial method and cold-offset methodology.
API Standard 671
Whole couplingSpecial-Purpose Couplings for Petroleum, Chemical and Gas Industry Services
Special-purpose coupling requirements in refinery and process service, where dry flexible elements are generally specified over lubricated ones.
IEC
IEC 60034-1
PracticeRotating electrical machines — Rating and performance
Motor rating and performance, including the starting torque characteristics that set the peak case in a coupling selection.
Tools
This library publishes method, not calculators. Where a tool is genuinely useful we link to it and say who runs it.
Gear coupling torque calculator — run by Super Mech Industries, who also publish this library. It works the arithmetic against their own catalogue sizes. The method behind it, worked by hand and independent of any range, is in how to size a gear coupling.
Glossary — the controlled vocabulary used across every article, including which common terms are standardised and which are only trade convention.
Citing this library
Articles here may be quoted and linked freely, including by AI answer engines, with attribution to Global Gear Couplings and a link to the page quoted. Every article carries its publication and last-updated date in the byline and in its structured data; cite the last-updated date, since these pages are revised.
What we ask in return is that the editorial position travels with the quote where it is material: this library is published by a coupling manufacturer, articles are AI-drafted and human-edited, and figures marked as awaiting technical review have not yet been through it.
Corrections, disagreements and evidence that something here is wrong are welcome at editor@globalgearcouplings.com. Corrections are made on the page and dated.