Hatz Head Nut M6 - OEM Number: 040028300

The Hatz Cylinder Head Nut M8 (OEM 040028300) is a genuine replacement fastening nut designed for use on selected Hatz diesel engines. It secures the cylinder head to the engine block by fastening onto the cylinder head studs, providing the clamping force required to maintain a reliable seal between the cylinder head, head gasket, and engine block during operation.

Manufactured to OEM specifications, the M8 head nut is produced from high-strength steel to withstand the high temperatures, vibration, and mechanical loads experienced within diesel engines. Precision-machined threads ensure accurate torque application and consistent clamping force, helping to maintain engine reliability and prevent compression or coolant leaks.

FUNCTION AND OPERATION

• Secures the cylinder head to the engine block
• Provides the correct clamping force for the head gasket
• Maintains cylinder compression and sealing integrity
• Resists loosening under vibration and thermal cycling
• Supports reliable long-term engine performance
• Designed for demanding industrial and construction applications

TECHNICAL DETAILS

• OEM Part Number: 040028300
• Type: Cylinder head nut
• Thread Size: M6
• Function: Cylinder head fastening
• Material: High-strength steel
• Application: Selected Hatz diesel engines
• Design: OEM direct replacement component

TYPICAL APPLICATIONS

Suitable for selected Hatz diesel engines used in:

• Plate compactors
• Pedestrian rollers
• Generators
• Water pumps
• Lighting towers
• Industrial power units
• Construction and agricultural machinery fitted with compatible Hatz engines

Always verify compatibility using the engine model and serial number before ordering, as cylinder head fasteners may vary between engine families.

IMPORTANT INFORMATION

Always confirm the correct OEM part number, engine model, and thread specification before ordering, as Hatz uses different cylinder head fasteners across its engine range. Installing the correct nut is essential to achieve the specified clamping force and maintain a reliable seal between the cylinder head and engine block.

When replacing a cylinder head nut, inspect the cylinder head studs, threads, and mating surfaces for signs of wear, stretching, corrosion, or damage. Always tighten the nuts using the manufacturer's recommended tightening sequence and torque specification to ensure even gasket compression and prevent engine damage.

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery*
£11.95 or FREE for orders over £150
Orders placed before 4pm Monday to Friday will be delivered on the next business day.
Orders placed after 4pm on Friday will be delivered the following Tuesday.
*Next day delivery applies to stocked items only. Availability can be found on the product pages.

Premium Delivery*
£30.00 for delivery before 10:30am
£25.00 for delivery before 12:30pm
*Premium delivery applies to stocked items only. Availability can be found on the product pages.

For all other countries, please click here for full delivery information.

**Separate carriage charges apply to bulk products such as 205L barrels.