ISO 5843-3:1997

Overview - ISO 5843-3:1997 (Aerospace bolts and nuts terminology)

ISO 5843-3:1997 is the second edition of Part 3 of the ISO 5843 series and establishes an authoritative list of equivalent terms used in aerospace engineering specifically for bolts and nuts. Prepared by ISO/TC 20/SC 8 (Aerospace terminology), the standard publishes equivalent terms in English, French and Russian (the three official ISO languages) and - at the request of the committee - German equivalents supplied by DIN. Note: only the terms in the three official ISO languages are considered ISO terms. This edition replaces the 1987 first edition and adds a substantial number of terms.

Key topics and contents

The standard is a terminology reference rather than a dimensional or material specification. Key technical topics covered include:

• Types of bolts and nuts - examples in the list: shoulder bolts, tension (traction) bolts, shear bolts, pan-head, twelve‑point and eye bolts.
• Head and end features - chamfered ends, countersunk head, flange, pan head, rounded ends.
• Thread and diameter terminology - major/minor/pitch/nominal diameters, thread root, thread blank, thread to head.
• Shank and shoulder dimensions - plain shank, relieved shank, shank diameter, slug (core) diameter.
• Special features and functional terms - lightening holes, split‑pin holes, sealing caps, locking elements, driving inserts and wrenching surfaces.
• Multilingual indexes - alphabetical indexes in French, Russian and German to aid lookup.

The document organizes equivalents in tabular form (English–French–Russian–German) and includes indexed cross-references for practical use.

Practical applications and users

ISO 5843-3 is valuable for professionals who need precise, cross‑language nomenclature in aerospace contexts:

• Design and stress engineers ensuring unambiguous component descriptions.
• Technical writers and illustrators producing multilingual maintenance manuals, installation guides and parts catalogs.
• Procurement and supply chain teams matching part descriptions across international suppliers.
• Regulatory and certification bodies verifying terminology consistency in documentation.
• Translators and localization specialists working on aerospace technical content.

Using consistent terminology reduces errors in drawings, procurement, assembly and maintenance, and supports international collaboration.

Related standards

• Other parts of the ISO 5843 series (general aerospace terminology) complement Part 3.
• ISO 5843-3 is typically used alongside standards for fastener dimensions, materials and testing and national standards (e.g., DIN) for language-specific equivalents.

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