A bolt-and-lock-washer assembly combines a bolt with a washer intended to resist loosening, but the right choice depends on fastener size, material, and application. These five options include washer assortments for common SAE and metric sizes, a combined flat-and-lock-washer kit, and a bolt assortment with washers included. The Magicave kit suits broad SAE needs, while the Taiss kit is the most direct choice if you need bolts, nuts, and washers together.
| Product | Best For | Sizes or Contents |
|---|---|---|
| Magicave Spring Lock Washer Kit | Broad SAE washer selection | 9 sizes, 1,000 pieces |
| M8 Stainless Steel Washers | Projects using M8 fasteners | 40 M8 washers |
| Metric & SAE Washer Kit | Mixed-size projects | 12 sizes, 295 pieces |
| Taiss Metric Bolt Assortment | Bolts, nuts, and washers together | 966 pieces, M4–M8 |
| Ruibapa Flat and Lock Washer Kit | SAE flat and spring washers | 7 sizes, 360 pieces |
Magicave 1,000-Piece SAE Lock Washer Kit
Best for: Home shops and repair work that call for several common SAE washer sizes. This assortment includes 1,000 split lock washers in nine sizes, from #4 through 1/2 inch, so it covers a broad range of screw and bolt dimensions.
The washers are listed as 304 stainless steel. The product information describes spring tension as the locking action, intended to help resist loosening from vibration or impact. Choose this kit if you need a large supply of stainless SAE washers rather than a complete bolt-and-nut assortment.
Limitation: The listed sizes are SAE; choose another option if your project calls for metric washers.
M8 Stainless Steel Spring Lock Washers
Best for: Buyers who already know they need M8 hardware and do not want a mixed-size assortment. The package contains 40 washers. Listed dimensions are an 8 mm inner diameter, 12.5 mm outer diameter, and 2 mm thickness.
These split washers are identified as 304 stainless steel. The product description says their offset split ends are designed to create tension when tightened and help resist loosening. This focused pack is more appropriate than a large kit for a project with a consistent M8 fastener size.
Limitation: This package contains M8 washers only, so it is not a flexible option for projects requiring multiple diameters.
295-Piece Metric and SAE Washer Kit
Best for: DIY users or maintenance work involving both metric and SAE fasteners. The 295-piece kit lists 12 sizes: metric M3, M4, M5, M6, M8, and M10, plus SAE #6, #8, #10, 1/4 inch, 5/16 inch, and 3/8 inch.
The washers are described as 304 stainless steel split lock washers. The listing says they apply spring tension to help resist loosening caused by vibration. Choose this kit over a single-standard assortment when you need a range of sizes in one purchase.
Limitation: The quantities vary by size, and the listing provides as few as 10 pieces for some sizes. Check the size breakdown before buying for a project that needs many matching washers.
Taiss 966-Piece Metric Bolt and Washer Kit
Best for: Buyers looking for bolts, nuts, flat washers, and lock washers in one organized assortment. The 966-piece kit covers M4, M5, M6, and M8 bolts in listed lengths from 12 to 30 mm, with some sizes varying by diameter. The case has labeled compartments.
The product description identifies the bolts and nuts as grade 8.8 alloy steel with a galvanized surface. It also lists matching nuts, flat washers, and lock washers. This is the most complete choice here when the project requires the fasteners as well as washers.
Limitation: This is a metric assortment, not a source for SAE bolts. Review the included lengths and size list to confirm they match your assembly.
Ruibapa Flat and Spring Lock Washer Kit
Best for: Buyers who want both flat washers and spring lock washers in common SAE sizes. The product name describes a 360-piece kit with seven sizes: 6#, 8#, 10#, 1/4 inch, 5/16 inch, 3/8 inch, and 1/2 inch. The name also identifies the lock washers and flat washers as 304 stainless steel.
A flat washer and a split lock washer serve different roles in an assembly, so having both types can be useful when the design calls for each. This option is more suitable than a lock-washer-only kit if you need both washer styles.
Limitation: Detailed feature information was not provided for this listing. Confirm the package contents and size distribution before purchase.
Buying Guide: How to Choose a Bolt With a Lock Washer
How do you match a lock washer to a bolt?
Match the washer to the fastener’s nominal diameter and standard. SAE and metric measurements are not interchangeable labels: an M8 washer is intended for an M8 fastener, while a 5/16-inch washer belongs to an SAE size range. Check the washer dimensions and the bolt or screw specification rather than choosing by appearance alone.
Do you need bolts included?
Choose a washer assortment if you already have the correct bolts and nuts. Choose a combined bolt kit, such as the Taiss assortment, if you also need metric bolts and nuts. A washer-only kit does not provide the matching fastener.
Should you select stainless steel or galvanized hardware?
The washer kits above list 304 stainless steel, while the Taiss bolt kit lists galvanized alloy steel bolts and nuts. Compare the material of every part in the assembly with the project environment and requirements. The product details provided do not establish suitability for every corrosive, structural, or high-load application.
What should you know about split lock washers?
A split lock washer is designed to add spring tension when compressed. Product listings describe this as helping resist loosening, but the correct fastener, installation, and application still matter. Follow the equipment or project instructions when they specify a washer type or assembly method.
Frequently Asked Questions
What is a bolt with a lock washer?
It is a fastener assembly in which a lock washer is placed with a bolt, typically beneath the nut or bolt head as directed by the design. The washer is intended to help resist loosening.
Can I use an SAE lock washer on a metric bolt?
Do not assume they are interchangeable. Match the washer’s size standard and dimensions to the fastener.
Which option includes bolts and nuts?
The Taiss kit lists metric bolts, nuts, flat washers, and lock washers. The other products are washer assortments.
Which kit is best for mixed metric and SAE work?
The 295-piece washer kit lists both metric and SAE sizes. It is a washer assortment, not a bolt kit.
Are all the listed washers stainless steel?
The product details identify the Magicave, M8, and 295-piece washer kits as 304 stainless steel. The Ruibapa name describes stainless steel washers, but detailed feature information was not supplied.