ISO 6336-5-16-2016 pdf free download.Calculation of load capacity of spur and helical gears – Part 5: Strength and quality of materials.
This document describes contact and tooth-root stresses and gives numerical values for both limit stress numbers. It specifies requirements for material quality and heat treatment and comments on their influences on both limit stress numbers.
Values in accordance with this document are suitable for use with the calculation procedures provided in ISO 6336-2, Iso 6336-3 and ISO 6336-6 and in the application standards for industrial, high-speed and marine gears. They are applicable to the calculation procedures given in ISO 10300 for rating the load capacity of bevel gears. This document is applicable to all gearing, basic rack profiles, profile dimensions, design, etc., covered by those standards. The results are in good agreement with other methods for the range indicated in the scope of ISO 6336-1 and ISO 10300-1.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 53, Cylindrical gears for general and heavy engineering — Standard basic rack tooth profile
ISO 642, Steel — Hardenability test by end quenching (jominy test)
ISO 643:2012, Steels — Micrographic determination of the apparent grain size
ISO 683-1, Heat-treatable steels, ailoy steels and free-cutting steels — Part 1: Non-alloy steels for quenching and tempering
ISO 683-2, Heat-treatable steels, alloy steels and free-cutting steels — Part 2: Alloy steels for quenching and tempering
ISO 683-3, Heat-treatable steels, alloy steels and free-cutting steels — Part 3: Case-hardening steels
ISO 683-4, Heat-treatable steels, alloy steels and free-cutting steels — Part 4: Free-cutting steels
ISO 683-5, Heat-treatable steels, alloy steels and free-cutting steels — PartS: Nitriding steels
ISO 1328-1, Cylindrical gears — ISO system of flank tolerance classification — Part 1: Definitions and allowable values of deviations relevant to flanks of gear teeth
ISO 2639, Steels — Determination and verification of the depth of carburized and hardened cases
ISO 3754, Steel — Determination of effective depth of hardening after flame or induction hardening
ISO 4948-2, Steels — Classification — Part 2: Classification of unalloyed and alloy steels according to main quality classes and main property or application characteristics
3 Terms, definitions and symbols
For the purposes of this document, the terms and definitions given in ISO 1122-1 and the symbols and units given in ISO 6336-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— I EC Electropedia: available at
— ISO Online browsing platform: available at
4 Methods for the determination of allowable stress numbers
4.1 General
Allowable stress numbers should be determined for each material and material condition, preferably by means of gear running tests. Test conditions and component dimensions should equate, as nearly as is practicable, to the operating conditions and dimensions of the gears to be rated.
When evaluating test results or data derived from field service, it is always necessary to ascertain whether or not specific influences on permissible stresses are already included with the evaluated data, e.g. in the case of surface durability, the effects of lubricants, surface roughness and gear geometry; in the case of tooth bending strength, the fillet radius, surface roughness and gear geometry. If a specific influence is included in the permissible stress derived from tests or from field service data, then the relevant influence factor should be set equal to 1,0 in the calculation procedure of ISO 6336-2 and ISO 6336-3.ISO 6336-5-16 pdf download.