ISO 965 (ISO general purpose metric screw thread—tolerances) is an International Organization for Standardization (ISO) standard for metric screw thread tolerances. It specifies the basic profile for ISO general purpose metric screw threads (M) conforming to ISO 261.
The tolerance system refers to the basic profile in accordance with ISO 68-1. The Field of application and purpose of ISO 965 can be defined as "ISO 965 specifies a tolerance system for screw threads from 1mm diameter upwards.
Limits for Metric (standard) Coarse Threads According To ISO 965.
|Major diameter||Pitch diameter|
The standard consists of the following parts:
ISO 898 is an international standard that defines mechanical and physical properties for metric fasteners. This standard is the origin for other standards that define properties for similar metric fasteners, such as SAE J1199 and ASTM F568M. It is divided into five (nonconsecutive) parts:
1. Bolts, screws and studs with specified property classes – Coarse thread and fine pitch thread2. Nuts with specified proof load values – Coarse thread5. Set screws and similar threaded fasteners not under tensile stresses6. Nuts with specified proof load values – Fine pitch thread7. Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mmWith exception to part 7, which defines test standards, the parts of this standard define properties for fasteners made of carbon steel and alloy steel. The standards define that the testing must be performed at ambient temperatures, which is defined as between 10 and 35 °C (50 and 95 °F). The standards do not cover fasteners that would otherwise apply but require special properties, such as weldability or corrosion resistance.ISO metric screw thread
The ISO metric screw threads are the worldwide most commonly used type of general-purpose screw thread. They were one of the first international standards agreed when the International Organization for Standardization (ISO) was set up in 1947.The "M" designation for metric screws indicates the nominal outer diameter of the screw, in millimeters (e.g., an M6 screw has a nominal outer diameter of 6 millimeters).List of International Organization for Standardization standards, 1-4999
This is a list of published International Organization for Standardization (ISO) standards and other deliverables. For a complete and up-to-date list of all the ISO standards, see the ISO catalogue.The standards are protected by copyright and most of them must be purchased. However, about 300 of the standards produced by ISO and IEC's Joint Technical Committee 1 (JTC1) have been made freely and publicly available.Zinc flake coating
Zinc flake coatings are non-electrolytically applied coatings, which provide good protection against corrosion. These coatings consist of a mixture of zinc and aluminium flakes, which are bonded together by an inorganic matrix.
The specifications for zinc flake coatings are defined in international standard ISO 10683 and also in European standard EN 13858. ISO 10683 sets out the requirements for zinc flake coatings for threaded fasteners and EN 13858 describes the requirements for zinc flake coatings for fasteners with no thread and for other parts as well. There are three groups of zinc flake coatings:
Zinc flake coatings containing Cr(VI) (hexavalent chromium): surfaces containing Cr(VI) provide greater anti-corrosion protection with a thinner coating, but Cr(VI) is carcinogenic and poses a potential risk to the environment. New European decrees prohibit the use of surfaces containing Cr(VI). These include the Vehicle End-of-Life Directive EC 2000/53 as of 1 July 2007 and directive EC 2002/95 on electrical and electronic equipment (the RoHS Directive). For applications outside of the automotive and electrical industries these coatings are still valid.
Solvent-based Cr(VI)-free zinc flake coatings.
Water-based Cr(VI)-free zinc flake coatings.Cr(VI)-free coatings are more environmentally friendly than surfaces with a Cr(VI) content. No zinc flake coatings used in the automotive industry nowadays contain this substance.
Various manufacturers, such as car companies and their suppliers, have produced their own specifications and supply rules in order to define the requirements for these coating systems.
Zinc flake coating is a generic term for the coating technology and this is marketed by the different suppliers under their respective brand names. The companies generally act as licensors for the individual coating businesses.
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