ISO 4029 Socket Set Screws

ISO 4029 is the international standard for socket set screws. This page sets out what the standard governs, the size range it specifies, and the related standards you will see referenced in datasheets.

ISO 4029 — Scope

ISO 4029 specifies the dimensions and tolerances of socket set screws. Material, property class, surface finish and packaging are governed by separate documents in the same standards family (for example ISO 898-1 for the mechanical property classes of bolts and screws).

Tolerance & Product Grades

ISO 4029, alongside the related ISO 4026 / ISO 4029 / DIN 913-916 entries on this site, specifies product grades (typically A or B for fine work and C for general engineering) and tolerance classes for the controlling dimensions. Choose the grade against the precision your application requires.

Dimensions Specified by ISO 4029

Companion Standards

ISO 4029 controls only the geometry of socket set screws. The mechanical strength is set by ISO 898-1 (bolts and screws) or ISO 898-2 (nuts); the surface finish is governed by separate finish standards (e.g. ISO 4042 for electroplating). For corrosion testing, the relevant document is ISO 9227 (neutral salt spray).

When to Specify ISO 4029

Choose ISO 4029 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for socket set screws.