Crusader RS6529 Hex Head Cap Screw | M8 x 1.25 x 16mm | OEM Crusader Marine Engine Fastener

Crusader RS6529 — Hex Head Cap Screw | M8 x 1.25 x 16mm | OEM Crusader Marine Engine Fastener

Crusader RS6529 is a genuine OEM hex head cap screw (HHCS) for Crusader marine engines. Thread specification is M8 x 1.25mm pitch, 16mm length — a standard metric coarse thread fastener used across a range of Crusader engine assemblies. When replacing fasteners on Crusader marine engines, always use the specified OEM part number to ensure correct thread specification, material grade, and torque value compliance. Contact us with your Crusader engine model, serial number, and the assembly you are working on and we’ll confirm RS6529 is the correct fastener before you order.

Confirm Fitment Before Ordering

Confirm your Crusader engine model and the assembly requiring this fastener before ordering. Contact us by email, text, or live chat with your engine model and serial number and we’ll verify RS6529 is the correct hex head cap screw for your application.

Part Specifications

• Crusader Part Number: RS6529
• Fastener Type: Hex head cap screw (HHCS)
• Thread Size: M8 x 1.25mm pitch
• Length: 16mm
• Thread Type: Metric coarse
• Application: Crusader marine engines
• Type: OEM replacement
• Vendor: Crusader Engines

Additional Information

• Vendor: Crusader Engines
• Part Number: RS6529
• Fastener Type: Hex head cap screw (HHCS)
• Thread Size: M8 x 1.25 x 16mm
• Application: Crusader marine engines

Installation Notes

Torque fasteners to the specification listed in the applicable Crusader service manual for your engine model and the specific assembly being serviced. Do not substitute with generic metric fasteners where OEM hardware is specified — material grade and thread specification must match the OEM requirement.

Frequently Asked Questions

Q: What does HHCS M8 x 1.25 x 16 mean?
A: HHCS stands for Hex Head Cap Screw. M8 = 8mm shank diameter, 1.25 = 1.25mm thread pitch (standard metric coarse for M8), 16 = 16mm length. This is one of the most common metric fastener sizes used in marine engine assemblies.

Q: What Crusader engines does RS6529 fit?
A: RS6529 is listed in the Crusader parts catalog as an OEM hex head cap screw for Crusader marine engines. Contact us with your engine model, serial number, and the assembly you are working on and we’ll confirm RS6529 is the correct fastener for your application.

Q: Can I use a generic M8 x 1.25 x 16 bolt instead of OEM RS6529?
A: For non-critical fastener locations, a correctly graded metric M8 x 1.25 x 16mm hex head cap screw may be acceptable. However, for critical applications such as cylinder head bolts, exhaust manifold studs, or structural assemblies, always use the OEM specified fastener to ensure correct material grade and torque compliance. When in doubt, use OEM.

Q: Is Crusader RS6529 a genuine OEM part?
A: Yes — RS6529 is a genuine OEM Crusader Engines fastener sourced directly from the Crusader parts catalog.

Q: Should I replace fasteners with new ones during engine service?
A: Yes — for assemblies that are disassembled during service (such as intake manifolds, valve covers, or timing covers), replacing fasteners with new OEM hardware is best practice. Reused fasteners may have stretched threads or reduced clamping force, which can result in leaks or fastener failure. At $1.95, replacing with new OEM hardware is inexpensive insurance.