ISO/TC 2/SC 7 - Reference standards

This document specifies an inspection procedure to be used by the purchaser where no prior agreement exists. It also specifies a reference acceptance procedure for acceptance or rejection of an inspection lot, when no agreement can be reached between the purchaser and the supplier, or where conformance to specification is disputed. It applies to inspection lots of bolts, screws, studs, nuts, pins, washers, rivets and other related fasteners. This document applies to fasteners not intended for high volume machine assembly, special-purpose applications or specially engineered applications requiring more advanced in-process control and lot traceability. For in-process control or final inspection by the manufacture and sorting, see ISO 16426.

ISO 16228:2017 specifies the different types of fastener inspection documents issued by the fastener manufacturer or distributor and/or by the external authorized representative on specific request of the purchaser at the time of the order. - declaration of compliance (F2.1); - test reports (F2.2, F3.1 and F3.2). NOTE The term "certificate" is in common use, however for fastener inspection documents the terminology to be used is "test report". ISO 16228:2017 specifies requirements for the content of each fastener inspection document, in conjunction with the order, the relevant standards and/or specified requirements. ISO 16228:2017 is applicable to finished fasteners such as bolts, screws, studs, nuts, washers, pins, rivets, etc. made of steel, stainless steel, non-ferrous metal or non-metallic material. ISO 16228:2017 does not apply to special-purpose or specially engineered applications requiring other types of procedures (e.g. initial samples). Examples of inspection documents are given in Annex A. An example of a coding system identifying the sections in fastener inspection documents is given in Annex B.

ISO 888:2012 specifies lengths and thread lengths for bolts, screws and studs for use in appropriate product standards and other relevant documents, e.g. for parts per drawing. It applies to bolts, screws and studs with ISO metric screw thread according to ISO 68-1.

ISO 4753:2011 specifies the form and dimensions of ends of parts with external ISO metric screw thread (e.g. bolt, screw and stud ends) recommended for use. They apply to standardized or non-standardized threaded parts. For each end type, a symbol is specified and it is intended that these symbols be used when specifying one of the ends for threaded fasteners.

ISO 8992:2005 specifies the general requirements for standardized bolts, screws, studs and nuts, but is also recommended for these non-standardized fasteners.

ISO 15065:2005 specifies the dimensions and designation of countersinks for countersunk head screws with a head configuration in accordance with ISO 7721. It is applicable to the types of screws according to ISO 2009, ISO 2010, ISO 1482, ISO 1483, ISO 7046-1 and ISO 7046-2, ISO 7047, ISO 7050, ISO 7051, ISO 15482, ISO 15483, ISO 14584, ISO 14586, and ISO 14587.

ISO 16426 specifies requirements for a fastener quality assurance system to be met by the fastener manufacturers and distributors. These requirements are intended to reduce or prevent the production of non-conforming fasteners with the objective of approaching zero defects for the characteristics specified. This International Standard outlines the requirements from receipt of raw material through the manufacturing process to delivery at the distributor or the user, who is the installer.

This International Standard specifies the sizes of the radii under the head and the transition diameters of metric series general purpose bolts and screws.

Establishes limits for various types of surface discontinuities on nuts with nominal thread diameters from 5 mm up to and including 39 mm. Applies also for all mechanical property classes according to ISO 898-2 and ISO 898-6.

Establishes limits for various types of products and applies also to these products with: nominal thread diameters of 5 mm and larger, product grades A und B, property classes up to and including 10.9; the annex contains a sampling plan.

Establishes limits for various types of products and applies to these products with: nominal thread diameters of 5 mm and larger, product grades A and B, nominal lengths 1 10 d (or longer if specified), property class 12.9, and property classes 8.8, 9.8, and 10.9 (when specified or agreed); the annex contains a sampling plan.

Specifies and describes a system for use in product standards; gives examples for hexagon head bolts, screws, and nuts, tapping screws, parallel pins, and washers.

Lays down the dimensions and position of holes for products, recommended for use; tabulates dimensions for thread diameters from 4 mm up to and including 52 mm; gives tolerances for the product grades A, B and C

Lays down the form and dimensions of undercuts for bolts, screws and similar externally threaded products, recommended for use in those cases where it is needed for components such as plugs.

Specifies the widths to be used in the respective product standards; it sets out a logical ratio between underhead (or nut) bearing area and the tensile stress area of the screw thread.

Specifies diameters for general purpose applications; tabulates the hole diameters for fine, medium and coarse series for thread diameters from 1 mm up to 150 mm; holes for special applications should be selected on the basis of design requirements.

Specifies for fully threaded screws with machined, or rolled threads pitches of the thread ranging from 0,2 mm to 6 mm and thread diameters (coarse thread) ranging from 1 mm to 68 mm; it does not apply to those threaded fasteners where special requirements are laid down in the product standards.

Requires that standardized products are defined by: mechanical properties (material), product grade (tolerances), surface coatings (if required), special requirements (if agreed); gives specifications and reference to International Standards.

Gives terms in English, German, French, Italian, Spanish and Russian as well as figures related to: screw threads; shapes of heads; forms of shank; screw and bolt ends; driving features; miscellaneou bolt and scrws; screw plugs; studs; headless, set, tapping, wood, threated cutting and forming screws; hexagon,square, triangle, coctagon, pentagon, bihexagonal, and othernuts; washers as well as split pinss.

Specifies the nominal lengths from 2 mm up to and including 300 mm as well as from 1/16 inch up to and including 12 inch resp.; gives the coordination for thread lengths/diameters for the dimensions in millimeters and inches.