ISO 4026 Socket Set Screws Dimensions

Socket Set Screws manufactured to ISO 4026 are dimensioned by the size table reproduced on this page. The standard fixes geometry and tolerances only; material and property class are assigned by ISO 898-1/898-2, and surface finish by separate finish standards.

ISO 4026 — Scope

ISO 4026 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 4026, 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 4026

Companion Standards

ISO 4026 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 4026

Choose ISO 4026 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for socket set screws.