SIERRA MerCruiser Stainless Locknuts, 7/16-20, 5-Pack – 18-3721-9

Description

SIERRA MerCruiser Stainless Locknuts, 7/16-20, 5-Pack – 18-3721-9

Sierra 18-3721-9 is a Stainless nylon-insert locknut engineered for the specified marine application. MerCruiser MR/Alpha transom hardware and selected Mercury propeller applications using OEM locknut 11-34933.

• Stainless-steel nylon-insert locknuts supplied in a package of five.
• 7/16-20 thread specification.
• Catalog applications include MR/Alpha inner transom studs and selected Mercury propeller hardware.
• Replaces Mercury/MerCruiser 11-34933.
• Nylon-insert locknuts should not be reused when the insert no longer provides positive prevailing torque.

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: 18-3721-9
• Part Type: Stainless nylon-insert locknut
• Application: MerCruiser MR/Alpha transom hardware and selected Mercury propeller applications using OEM locknut 11-34933.
• Material: Stainless steel with nylon insert
• Thread: 7/16-20
• Package Quantity: 5

Interchange / OEM References

• Mercury Marine: 11-34933