Sierra 18-3752 Stainless Steel Retaining Nut for Mercruiser Stern Drive Shaft Housing - Replaces 816811-1

The Sierra 18-3752 is a stainless steel retaining nut engineered for the drive shaft housing on Mercruiser stern drive units. This nut secures the drive shaft housing assembly in place, and is manufactured to meet or exceed the specifications of the original equipment part it replaces. Sierra builds this component from stainless steel for corrosion resistance in the marine environment, with a fully threaded, right-hand Unified National Coarse (UNC) thread pattern and an inside thread size of M14. The flat-style head and coarse thread class are designed to provide a secure, reliable hold rated for a maximum shear strength between 1000 and 3000 lbf. Each package includes one retaining nut. As a direct fit for Mercruiser stern drive applications, it is intended as a straightforward replacement during drive shaft housing service or maintenance, and it carries the same fit and function expected from the original hardware it replaces.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3752
• Material: Stainless Steel
• Finish: Stainless Steel
• Color: White
• Thread Type: Unified National Coarse (UNC)
• Inside Thread Size: M14
• Thread Style: Right Hand
• Thread Coverage: Fully Threaded
• Thread Class: Coarse
• Screw Head Style: Flat
• Maximum Shear Strength: 1000 to 3000 lbf
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.25 pounds
• UPC: 030999975959
• Application: Mercruiser stern drive
• Quantity: 1 retaining nut per package

Fitment

• Mercruiser stern drive applications (drive shaft housing)

Replaces (OEM)

• 816811-1

Frequently Asked Questions

What does the Sierra 18-3752 retaining nut fit? The Sierra 18-3752 is designed for the drive shaft housing on Mercruiser stern drive units.

What OEM part number does the 18-3752 replace? It replaces OEM number 816811-1, and Sierra 18-3752 is manufactured to meet or exceed that original part's specifications.

What material is the 18-3752 retaining nut made from? Stainless steel, chosen for corrosion resistance in marine environments where this drive shaft housing hardware operates.

How many nuts come in a package? One retaining nut per package is included with the Sierra 18-3752.

What is the thread size and type on this nut? The 18-3752 has an M14 inside thread size with a fully threaded, right-hand Unified National Coarse (UNC) thread pattern.

What are the dimensions of the 18-3752 nut? Item dimensions are 0.39 x 0.39 x 0.39 inches for the Sierra 18-3752 retaining nut.

How much does the 18-3752 weigh? The Sierra 18-3752 retaining nut weighs 0.25 pounds.

What is the maximum shear strength rating? This retaining nut is rated between 1000 and 3000 lbf maximum shear strength.

Is the Sierra 18-3752 an OEM or aftermarket part? It is an aftermarket replacement manufactured by Sierra to meet or exceed the performance of the original equipment part it replaces, 816811-1.

What head style and drive type does this nut use? The 18-3752 has a flat screw head style and is configured for stern drive applications.

What color and finish does the 18-3752 have? It has a white color with a stainless steel finish.