SIERRA Mercury / Mariner Molded Nylon Prop Nut – 18-3703

Description

SIERRA Mercury / Mariner Molded Nylon Prop Nut – 18-3703

Sierra 18-3703 is a Molded nylon propeller nut engineered for the specified marine application. Mercury/Mariner 18/20/25 HP two-cycle outboards from approximately 1980 onward and specified F9.9/F15 323 cc BigFoot four-stroke applications.

• Special molded-nylon propeller nut for designated small Mercury/Mariner outboards.
• Fits 18/20/25 HP two-cycle families from approximately 1980 and newer where this nut is specified.
• Also cataloged for specified F9.9/F15 323 cc BigFoot four-stroke applications.
• Cross-references Mercury/Chrysler 11-88228, GLM 21242 and Mallory 9-73963.
• Match the prop-shaft thread and hub arrangement; do not substitute a metal nut or different locking system without OEM guidance.

Fitment for marine engine and drive service parts can vary by model, serial number, gearcase, cooling configuration and prior component supersessions. Compare the original OEM number and physical configuration before installation, and renew related seals, locking hardware or adjacent wear items when their condition requires it.

Specifications

• Manufacturer: Sierra
• Part Number: 18-3703
• Part Type: Molded nylon propeller nut
• Application: Mercury/Mariner 18/20/25 HP two-cycle outboards from approximately 1980 onward and specified F9.9/F15 323 cc BigFoot four-stroke applications.
• Material: Molded nylon

Interchange / OEM References

• Mercury Marine: 11-88228
• GLM: 21242
• Mallory: 9-73963