Hexagon Head Bolts - DIN 931, Stainless Steel, Grade 18/8 - (A2) 304, M16 X 260 mm

Overview

DIN 931 defines a hexagon head bolt with a partially threaded shank. The standard covers the dimensional form of the bolt, including the hex head, threaded portion and plain shank, so that the fastener can be selected consistently by diameter, length and thread. The partially threaded design is useful where the smooth shank should pass through the joint to improve alignment and carry shear loads, while the threaded section provides the clamping force.

This selected size is specified with diameter M16, length 260 mm, thread M16, pitch 2 mm.

Sold in multiples of '1 pieces. 1 Box = '1 pieces.

Material, Grade & Strength

A2 stainless steel, commonly associated with 304 stainless, provides good general corrosion resistance for outdoor, clean industrial and food-related environments. A2 stainless is often chosen where rust resistance is more important than the higher tensile strength of carbon steel grades. Stainless fasteners can gall during tightening, so suitable anti-seize or lubrication may be required.

Finish & Corrosion Protection

Stainless products rely on the corrosion resistance of the stainless material itself rather than a separate plated coating.

Typical Uses

DIN 931 bolts are commonly used in machinery, fabricated steelwork, mining equipment, agricultural equipment, brackets, frames and maintenance work where a strong partially threaded bolt is preferred over a fully threaded set screw.

Technical Tips

• Use a matching nut and washer of the same thread size and suitable strength class.
• Where possible, position the plain shank through the shear plane of the joint rather than leaving threads in the shear area.
• For Grade 8.8, 10.9 or 12.9 bolts, use correctly rated mating nuts and washers.
• Torque values vary by diameter, pitch, finish and lubrication; always confirm the correct torque before use in safety-critical assemblies.
• For corrosion-sensitive applications, match the finish or material to the environment rather than relying only on strength grade.

Selection Advice

Choose DIN 931 when the joint benefits from a partially threaded shank. Choose DIN 933 when a fully threaded hexagon head set screw is required. Confirm diameter, length, thread, material, finish and grade before ordering.

Frequently Asked Questions

What is the difference between DIN 931 and DIN 933? DIN 931 is partially threaded, while DIN 933 is fully threaded. DIN 931 is often preferred where the plain shank assists alignment or shear performance.

Is Grade 8.8 stainless steel? No. Grade 8.8 normally refers to high tensile carbon-alloy steel. Stainless fasteners are usually specified by A2, A4 or a stainless property class.