316 Stainless Steel Split Lock Washers 5/8 Pack of 100 - Corrosion

In this review we look at the 316 Stainless Steel Split Lock Washers 5/8 (Pack of 100) from Marine Bolt Supply to determine who will benefit most and why these washers are worth considering. The bottom line: these are heavy-duty spring lock washers made from type 316 stainless steel, designed for demanding environments where vibration and corrosion are concerns. For anyone fitting 5/8 fasteners in marine or chemical settings, the single biggest reason to buy is the combination of spring locking action and superior corrosion resistance that helps keep bolted assemblies secure over time.

Key Features

• Material: Type 316 stainless steel offers strong resistance to rust and corrosion, making these washers suitable for salt water and chemically aggressive environments.
• Fit: The internal diameter of 0.64 in and external diameter of 1.05 in are matched to 5/8 screws or bolts to provide reliable engagement.
• Thickness: At 0.165 in thick these split lock washers provide a robust spring action that compresses under load to resist loosening from vibration.
• Quantity and packaging: Pack of 100 washers supplied in heat sealed, privately labeled packaging for consistent inventory and protection from contamination.
• Locking action: The split, spring-type design flattens under pressure to increase friction and maintain clamp load in assemblies subject to movement.

Who It's For

These lock washers are aimed at professionals and serious DIYers who work with 5/8 in bolts in marine, industrial, or chemical applications where corrosion and vibration are concerns. Boat owners, dock builders, and field technicians who need hardware that resists salt water will appreciate the use of type 316 stainless steel and the pack size suited to larger projects.

Those who should look elsewhere include users who need other washer styles (flat washers, fender washers) or non-locking components, and anyone requiring metric sizes instead of the imperial 5/8 sizing provided here.

Pros & Cons

Pros

• Excellent corrosion resistance due to 100% type 316 stainless steel construction.
• Appropriate dimensions (0.64 in ID, 1.05 in OD, 0.165 in thick) for reliable locking on 5/8 in fasteners.
• Strong spring lock action helps prevent loosening from vibration in dynamic environments.
• Pack of 100 with heat sealed, privately labeled packaging keeps parts organized and protected.

Cons

• Designed only for 5/8 in fasteners, so not suitable for projects requiring other sizes.
• Stainless steel can gall if used with incompatible materials or without proper lubrication in high-torque applications.

Specifications

Brand	Marine Bolt Supply
Material	Type 316 stainless steel
Internal Diameter (ID)	0.64 in
Outer Diameter (OD)	1.05 in
Thickness	0.165 in
For Use With	Size 5/8 screws or bolts
Pack Quantity	100, heat sealed and privately labeled

Our Verdict

For anyone fastening 5/8 in bolts in marine or corrosive environments, these 316 stainless steel split lock washers represent good value because they combine proven spring locking action with superior corrosion resistance and convenient 100-piece packaging. They are not a universal solution for all washer needs, but they are a reliable choice when vibration resistance and rust prevention are priorities.

Frequently Asked Questions

Are these washers suitable for salt water use?
Yes, type 316 stainless steel is chosen specifically for strong resistance to rust and corrosion in salt water environments.

What bolt size do these fit?
They are intended for use with 5/8 in screws or bolts, with an internal diameter of 0.64 in.

How are the washers packaged?
Each pack contains 100 washers and is heat sealed and privately labeled by Marine Bolt Supply for protection and easy storage.