NEUTRAL STUD BOLT M45x340 100881

Wartsila M45x340 Stud Bolt with Waisted Shank – 100881

Description

This is a genuine Wartsila stud bolt, part number 100881, engineered for securing critical components in large industrial and marine engines. The ‘waisted shank’ design is crucial for applications requiring precise clamping force, as it allows the bolt to stretch elastically along its length, providing consistent tension under heavy loads and thermal expansion. The bolt is made from high-tensile steel and features a protective coating for enhanced durability and corrosion resistance.

Specifications

• Manufacturer: Wartsila
• Part Number: 100881
• Type: Stud Bolt with Waisted Shank
• Thread Size: M45
• Overall Length: 340 mm
• Material: High-Tensile Steel
• Coating: Zinc-Yellow Chromate

Label Info

• Part Number: 100881
• Description: STUD BOLT WITH WAISTED SHANK M45x340

Application

This stud bolt is specifically designed for high-stress fastening applications, such as securing cylinder heads, main bearing caps, and other major assemblies on Wartsila engines (e.g., Wartsila 20 series) and similar heavy machinery where reliability is paramount.

CO2 Impact

Opting for this component helps avoid 8.4 kg of CO2 emissions compared to manufacturing a new one. This saving is equivalent to driving a standard passenger car for approximately 42 kilometers.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the purpose of a ‘waisted shank’ on this bolt?

The reduced diameter of the shank, known as a ‘waisted shank’, ensures that stress is distributed more evenly along the bolt’s length. It allows the bolt to act like a precision spring, stretching elastically to maintain a constant clamping force despite vibrations and temperature changes, which is critical for engine head gaskets and bearings.

What is the correct tightening procedure for this M45 bolt?

Due to its size and critical application, this bolt should not be tightened with a standard torque wrench. The manufacturer specifies a procedure using hydraulic tensioning tools to achieve a precise bolt elongation or ‘stretch’, ensuring the correct clamping force. Always refer to the official Wartsila service manual for the specific engine model.

What does the yellowish coating indicate?

The golden-yellow finish is a zinc-yellow chromate passivation coating. This treatment provides a robust layer of protection against corrosion, which is essential for components operating in harsh marine or industrial environments where exposure to moisture and chemicals is common.

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Last Update: Friday, March 13, 2026