DIN 931

Product Description

DIN 931, defines hexagon-headed, half-threaded bolts. These bolts have threads only on part of the shank and are preferred in connections requiring high tensile loads due to their long shank length. The half-thread design is ideal for tensioned assemblies, flange connections, and the assembly of precision machine parts.

DIN 931 Bolts, unlike the fully threaded version of DIN 933, feature a threadless section up to a certain length. This makes them suitable for more durable and rigid connections. They are widely used in mechanical engineering, steel structure assembly, and industrial systems.

ISO 4014 It is largely compliant with the standard. Only minor differences exist in metric tolerances.

Technical Specifications

Feature
Standard	DIN 931
Material	Carbon Steel, Alloy Steel, Stainless Steel
Type	Hex Head Bolt with Shank
Quality	5.6, 6.8, 8.8, 10.9, 12.9, A2, A4, B7, L7
Coating	Electrogalvanized (White/Yellow), Hot-Dip Galvanized (HDG), Nickel, Black Oxide, Geomet
Tooth Type	Metric (Coarse) – UNC / UNF (optional)
Measurement Range	M10 to M64, 1/2″-2 1/2″
Production Method	Cold forging, hot forging, or machining
Thread Direction	Right-Hand Thread (standard) / Left-Hand Thread (upon request)

Areas of Use

Installation of machinery equipment
Flange piping systems
Steel structure applications
Industrial constructions
Automotive and construction machinery
Power plant and refinery equipment

Certificates and Quality Documents

ISO 9001:2015 Quality Management System
ISO 14001:2015 Environmental Management System
ISO 45001:2018 Occupational Health and Safety Management System
EU Declaration of Conformity (PED) certificate (Compliance with the Pressure Equipment Directive)
Our production processes, DIN, EN, ISO, and ASTM is fully compliant with the standards
Upon request EN 10204 3.1 certificate is provided