Bolt DIN 931 1/2x3 1/2 (89 mm) Grade 8 (~10,9) UNF 20

Overview

DIN 931 is a hex head bolt with a partial thread and inch thread. Its key feature is strength class 10.9, which provides high resistance to mechanical loads. The partial thread helps reduce the risk of cracks in the joint, as the smooth shank section under the head contributes to even load distribution. Various sizes are available, making this bolt versatile for many applications.

Applications

The DIN 931 10.9 UNF hex head bolt with partial thread is designed for systems that require inch threading, particularly in American and British structures. This bolt has a high strength class of 10.9, making it suitable for applications under significant loads, such as heavy machinery, the oil and gas industry, and shipbuilding.

Thanks to its partial thread, the bolt provides a reliable connection in structures where it is important to avoid excessive stress in the joint area. The hex head allows easy tightening and loosening, improving installation convenience. This product is an optimal choice for projects that require high reliability and durability.

Alternatives

DIN 931 10.9 UNF is a hex head bolt with a partial thread and UNF Fine inch thread. It is made of high-strength class 10.9 steel, providing increased resistance to mechanical loads. The bolt diameter complies with the UNF standard, making it suitable for structures where high connection reliability is required.

When choosing replacements, it is important to consider that DIN 931 with inch thread has no direct metric equivalents, as ISO 4014 is not suitable for inch threads. The thread pitch should also be checked: bolts from different standards may have the same diameter but be incompatible in their specifications.

Technical Specifications

Please note: the product color may vary depending on the production batch — black or grey. This does not affect the technical characteristics or quality of the product.

Is It Worth Buying

The DIN 931 10.9 UNF hex head bolt with partial thread is an optimal choice for applications requiring high strength and reliable connections. Strength class 10.9 provides resistance to significant loads, making it suitable for structures exposed to dynamic loads.

The inch thread allows the bolt to be easily integrated into systems where similar components are already used, while maintaining connection accuracy. The partial thread provides optimal engagement with the material, reducing the risk of thread stripping and increasing the overall reliability of the structure.

Where It Is Used

The DIN 931 10.9 UNF hex head bolt with partial thread is a reliable fastening element that meets high strength standards. Strength class 10.9 provides high load resistance, making it suitable for use in applications with increased reliability requirements.

This inch-threaded bolt can be easily integrated into existing systems, reducing the risk of damage to threaded holes. Thanks to its partial thread, it provides optimal engagement and connection stability, making it essential for industrial applications.