Sierra 18-2170 Shift Arm Screw, Replaces Mercury Marine 10-45590, Mercruiser Stern Drives

The Sierra 18-2170 Shift Arm Screw is a stainless steel fastener used on Mercruiser stern drive shift arm assemblies. It is sold individually (one screw per package) and is manufactured to meet or exceed the original equipment part it replaces. The screw uses a 1/4"-20 UNC thread with a Grade 2 rating and a round head style, giving it the strength and corrosion resistance needed for the marine shift linkage environment. Its stainless steel construction and stainless exterior finish resist saltwater and freshwater corrosion, helping the shift arm connection hold up over repeated use.

This part is a direct interchange for the OEM Mercury Marine shift arm screw used on Mercruiser stern drive units, and is commonly used when servicing or rebuilding shift arm linkage where the original fastener has been lost, damaged, or corroded. Because it is a small precision fastener, it is best ordered along with any other shift linkage hardware being serviced at the same time so the assembly goes back together with matched, correctly rated components.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2170
• Material: Stainless Steel
• Thread Size: 1/4"-20 UNC
• Thread Type: Unified National Coarse (UNC)
• Thread Class: 3A
• Head Style: Round
• Manufacturer Grade: Grade 2
• Exterior Finish: Stainless Steel
• Color: Silver
• Fastener Type: Screw
• Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.02 pounds
• Package Quantity: 1 screw

Fitment

Fits Mercruiser stern drives.

Replaces (OEM)

• GLM 21750
• Mercury Marine 10-45590
• 10-8M0084649

Frequently Asked Questions

What is the Sierra 18-2170 Shift Arm Screw used for? It is a shift arm screw used on Mercruiser stern drive shift linkage, and it comes as a single screw per package rather than a kit.

Does the Sierra 18-2170 fit all Mercruiser stern drives? The Sierra 18-2170 is designated for use on Mercruiser stern drives; a specific engine or drive model is not listed, so confirm the shift arm screw thread and head match your existing hardware before ordering.

What OEM part numbers does the Sierra 18-2170 replace? The Sierra 18-2170 interchanges with GLM 21750 and Mercury Marine 10-45590 and 10-8M0084649, so any of those OEM numbers can be used to cross-reference this screw.

Is the Sierra 18-2170 the same as the Mercury Marine 10-45590 screw? Yes, the Sierra 18-2170 is a direct interchange for Mercury Marine part 10-45590 and is built to meet or exceed the original equipment specification.

What material is the Sierra 18-2170 shift arm screw made from? It is made from stainless steel with a stainless steel exterior finish, giving it corrosion resistance in a marine environment.

What thread size does the Sierra 18-2170 use? The thread size is 1/4"-20 UNC (Unified National Coarse) with a 3A thread class and a Grade 2 rating.

How many screws come in a package of the Sierra 18-2170? Each package contains one Sierra 18-2170 shift arm screw.

What are the dimensions of the Sierra 18-2170 shift arm screw? The screw measures 0.39 x 0.39 x 0.39 inches and weighs 0.02 pounds.

What head style does the Sierra 18-2170 have? It has a round head style, consistent with the original Mercury Marine shift arm screw it replaces.

Is the Sierra 18-2170 genuine Sierra or aftermarket? The 18-2170 is manufactured by Sierra as a replacement part built to meet or exceed the original equipment shift arm screw it replaces.