ISO 7379-1983 PDF

Full title and description

ISO 7379:1983 — Hexagon socket head shoulder screws. This International Standard specifies dimensional, geometrical-tolerance and designation requirements for hexagon-socket (internal hex) head shoulder screws with metric dimensions and nominal shoulder diameters from 6.5 mm up to and including 25 mm; it also refers to related International Standards for threads, mechanical properties and surface condition.

Abstract

This standard defines the form, principal dimensions and tolerances for hexagon-socket head shoulder screws (shoulder screws with cylindrical heads and reduced threaded ends), intended for use where a precise unthreaded shoulder is required for location or bearing. The document gives example designations and points users to other ISO standards (for thread series, mechanical properties, surface texture and tolerances) when additional specifications are needed.

General information

• Status: Published (International Standard — confirmed in periodic review; current status confirmed by ISO review).
• Publication date: October 1983 (1 October 1983, Edition 1).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 21.060.10 (Bolts, screws, studs).
• Edition / version: Edition 1 (1983).
• Number of pages: 5 pages (main published document).

Scope

ISO 7379:1983 applies to hexagon-socket head shoulder screws with nominal shoulder diameters from 6.5 mm to 25 mm inclusive. It specifies the principal dimensions and geometrical tolerances for shoulder and head forms (including plain and knurled heads where applicable), and provides an example of designation. The standard notes limitations on conventional tensile testing for these parts due to the shoulder configuration and recommends selecting additional specifications (threads, material properties, surface finish, tolerances) from established International Standards where required.

Key topics and requirements

• Dimensional range: nominal shoulder diameters 6.5 mm to 25 mm, with corresponding thread sizes and head dimensions specified.
• Geometrical tolerances for shoulder diameter, shoulder length and concentricity relative to the thread axis.
• Head form and socket dimensions for hexagon-socket (internal hex) cylindrical heads; options for plain or knurled head styles where called out.
• Designation example showing how to specify shoulder diameter, thread size and head type in a product designation.
• Guidance to use other ISO standards for thread series, thread tolerancing, mechanical properties and surface finish (for example ISO thread and fastener property standards).
• Note on mechanical testing: conventional tensile testing may be limited or not applicable because of the unthreaded shoulder — users should follow the standard's note and select alternate verification methods as appropriate.

Typical use and users

Used by mechanical designers and engineers for assemblies requiring precise locating shoulders (bushings, bearings, pivot points), fastener manufacturers producing ISO-conforming shoulder screws, purchasing/specification teams in OEMs, and quality/inspection personnel who verify dimensional tolerances. Industrial suppliers and catalogue makers also reference ISO 7379 when listing metric shoulder screws.

Related standards

Standards commonly referenced alongside ISO 7379 include thread standards and fastener property/tolerance standards such as ISO 261 / ISO 965 (metric thread series and tolerancing), ISO 898-1 (mechanical properties of fasteners), ISO 1302 (surface texture) and ISO 4759‑1 (tolerance system for fasteners). Users are advised to consult these documents when specifying material grades, thread classes and surface requirements.

Keywords

hexagon socket head; shoulder screw; shoulder bolt; collar screw; metric shoulder; internal hex; dimensional tolerances; ISO 7379; fasteners.

FAQ

Q: What is this standard?

A: ISO 7379:1983 is an International Standard that specifies dimensions and tolerances for hexagon-socket head shoulder screws (cylindrical heads with reduced threaded ends) with nominal shoulder diameters from 6.5 mm to 25 mm.

Q: What does it cover?

A: It covers principal dimensions, geometrical tolerances, head/socket form and an example of designation for metric shoulder screws; it also points users to other ISO standards for thread details, mechanical properties and surface finish.

Q: Who typically uses it?

A: Mechanical designers, fastener manufacturers, procurement/specification teams, quality inspectors and suppliers who need standardized shoulder screws for precision assemblies.

Q: Is it current or superseded?

A: The published edition is from October 1983 (Edition 1). According to ISO's review records the standard has been subject to periodic review and was confirmed in ISO's review cycle; users should check the latest ISO catalogue or national standards body for any subsequent revisions or confirmations.

Q: Is it part of a series?

A: It is a standalone product standard for a specific fastener form but is intended to be used in conjunction with other ISO standards covering threads, mechanical properties and surface finish (for example ISO 261/965, ISO 898-1, ISO 1302, ISO 4759‑1).

Q: What are the key keywords?

A: Hexagon socket head, shoulder screw, shoulder bolt, internal hex, metric shoulder, tolerances, ISO 7379.