M16 10.9 Zinc Hex Head Bolts DIN 931

Product Description

M16 Grade 10.9 Zinc-Plated Hexagon Head Bolts – DIN 931

These M16 hexagon-head bolts are manufactured from high-tensile grade 10.9 steel, finished with zinc plating and dimensionally manufactured to DIN 931. They are partially threaded, leaving an unthreaded shank for locating components and carrying shear loads through the bolted joint.

Each bolt has a standard M16 coarse metric thread with a 2mm pitch and a 24mm hexagon head. Grade 10.9 provides higher tensile and proof strength than the commonly used grade 8.8, making these bolts suitable for demanding engineering and structural assemblies.

Bolt length is measured from directly beneath the hexagon head to the end of the bolt. Nuts and washers are not included unless stated separately.

Typical Applications

• Heavy machinery and industrial equipment
• Automotive and commercial vehicle assemblies
• Structural steelwork and fabrication
• Agricultural and construction machinery
• Plant maintenance and high-load engineering joints

Product Specifications

• Thread size: M16
• Thread pitch: 2mm standard metric coarse
• Material: High-tensile carbon or alloy steel
• Property class: 10.9
• Finish: Zinc plated
• Thread form: Part threaded with unthreaded shank
• Head style: External hexagon
• Spanner size: 24mm across flats
• Nominal head height: 10mm
• Manufacturing standard: DIN 931
• Current dimensional equivalent: ISO 4014 / BS EN ISO 4014
• Mechanical properties: ISO 898-1

The zinc-plated finish provides moderate protection against corrosion in dry indoor and general industrial environments. It is not equivalent to hot-dip galvanising or stainless steel and may require additional protection in exposed, coastal or chemically aggressive conditions.

For safety-critical or highly loaded joints, use compatible property-class nuts and hardened washers and follow the equipment manufacturer's specified tightening procedure. Torque values depend on lubrication, coating, joint design and the required preload.

Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.