- Top Pick: 1000 Pcs Spring Lock Washers Assortment Kit – 9 SAE Sizes Split Lock Washers, 304 Stainless Steel Washers for Screws and Bolts (#4, #6, #8, #10, #12, 1/4", 5/16", 3/8", 1/2")
- Best Value: Vifmy SAE & Metric Split Spring Lock Washer Assortment kit 304 SS 1780Pcs
- Premium Choice: Vifmy Metric Split Spring Lock Washer Assortment Kit M2-M12 304 SS 1000Pcs
Spring lock washers solve a deceptively simple problem: fasteners that loosen over time due to vibration, thermal cycling, or repeated mechanical stress. Whether you are securing a rack mount behind an Apple TV, clamping a display arm, or locking down hardware on an iPhone repair station, a properly chosen washer keeps the joint tight without requiring thread-locking adhesive. The wrong choice, however, introduces its own headaches. Poor steel, thin gauges that flatten under load, and mismatched sizes that ride up on the bolt head all defeat the purpose of having a split lock washer in the first place.
What separates a good assortment kit from a mediocre one comes down to material grade, coverage of the sizes you actually need, and how the washers are stored and counted. Most kits listed here use 304 stainless steel, so corrosion resistance is not a differentiator. The real differences show up in piece counts per size, whether metric and SAE options are mixed, and whether the spring tension holds its shape through repeated use. We compared published specs and owner feedback to identify the eight kits that deliver the most value for common hardware projects in 2026.
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Quick Picks
| Product | Best for | Price |
|---|---|---|
| 1000 Pcs 9 SAE Assortment Kit | General SAE home workshop use | $8.99 |
| Vifmy SAE & Metric 1780Pcs | Mixed-standard repair jobs | $22.99 |
| Vifmy Metric M2-M12 1000Pcs | Metric-only electronics or appliance work | $9.99 |
| Ruibapa 360 Pcs Flat + Spring | Projects needing paired flat and lock washers | $8.99 |
| binifiMux 1150pcs M2-M12 | Bulk metric stock on a budget | $6.99 |
| Vifmy SAE #4-1/2 910Pcs | Focused SAE range without metric confusion | $9.99 |
| 1100 Pcs Metric M2-M12 | Largest per-size count in a metric-only kit | $7.99 |
| Neprift 40PCS M8 | Single-size replacement for a known project | $4.99 |
How We Picked
Three criteria drove our shortlist. First, material and gauge consistency: kits where owners report washers that spring back reliably and do not crumple under moderate torque scored higher. Second, size coverage relative to your actual workload, since a kit with generous counts of rarely used sizes wastes money. Third, packaging and organization, because sorting 1000+ identical washers from a single bag is a practical problem that affects whether you reach for a kit again. We weighted owner feedback on these points alongside published piece counts and price-per-washer.
The 8 Best Spring Lock Washers in 2026
1000 Pcs Spring Lock Washers Assortment Kit (9 SAE Sizes)
This kit targets anyone whose fastener work is exclusively SAE. Nine sizes from #4 through 1/2 inch cover the range you encounter in furniture assembly, automotive trim, and consumer electronics mounting. The 304 stainless construction resists rust even in humid workshops, and the piece distribution leans heavily toward mid-range sizes like #8 and 1/4 inch where demand peaks.
- Pro: Generous count in the sizes you actually reach for most often.
- Pro: Low per-washer cost makes it easy to justify keeping one in every room.
- Con: No metric option, so it falls short if you encounter imported hardware.
Skip this if your projects mix SAE and metric fasteners; you will end up buying a second kit.
Vifmy SAE & Metric Split Spring Lock Washer Assortment Kit 1780Pcs
For repair technicians and makers who encounter both standards daily, this is the broadest coverage on the list. Seventeen sizes spanning SAE and metric in a single case eliminate the need to own two separate kits. The 304 stainless material matches every other entry, so the value proposition is purely organizational: one box, one inventory, no cross-referencing between kits.
- Pro: Widest size range in the roundup, covering edge cases like #2-56 and M12.
- Pro: Clear compartment labeling that speeds size identification.
- Con: Highest price point, and some rarely used sizes receive the same allocation as common ones.
Pass on this if your work is strictly SAE or strictly metric; the extra pieces you never use inflate the cost without adding value.
Vifmy Metric Split Spring Lock Washer Assortment Kit M2-M12 1000Pcs
This kit serves the growing number of projects where every fastener is metric: modern electronics enclosures, imported appliances, and most non-automotive consumer products. Ten sizes from M2 to M12 give you a fine thread pitch spread that covers everything from tiny PCB standoffs to medium structural bolts. The 1000-piece total distributes roughly evenly across sizes.
- Pro: M2 and M2.5 sizes are present, which most SAE kits omit entirely.
- Pro: Compact enough for a drawer in an electronics repair station.
- Con: Lower piece count per size than bulkier metric alternatives, so heavy users deplete common sizes quickly.
Not the right choice if you regularly work with bolts above M12 or need SAE compatibility.
Ruibapa 360 Pcs Flat Washer and Spring Lock Washers Assortment Kit
This kit pairs flat washers with spring lock washers across seven SAE sizes. That combination addresses a specific workflow problem: situations where you need a flat washer to distribute load and a split lock washer to resist loosening, used together on the same bolt. The 304 stainless material is consistent throughout both washer types.
- Pro: Pre-matched flat and lock pairs eliminate guesswork about diameter compatibility.
- Pro: Low price despite the dual-washer concept.
- Con: Total piece count is modest at 360, so heavy users burn through small sizes fast.
Consider a dedicated spring lock kit if you already stock flat washers separately; this saves little on that front.
binifiMux 1150pcs M2-M12 Spring Lock Washers Assortment Kit
At the lowest price per piece among metric kits, this 1150-piece set from binifiMux is a volume play. Nine metric sizes from M2 through M12 mirror the size range of pricier competitors, and the 304 stainless material holds up in the same way. Owners note that individual bags are thinner than those in premium kits, which matters if you store them in a shared drawer.
- Pro: Cheapest metric option on the list while covering the same size span.
- Pro: Good piece count in mid-range M4-M6 sizes where most fasteners land.
- Con: Packaging lacks labeled compartments; sorting requires transferring to your own case.
If organization matters more than cost and you dislike transferring hardware into separate containers, a boxed kit is worth the premium.
Vifmy SAE Split Spring Lock Washer Assortment Kit #4-1/2 910Pcs
Designed for users who want a curated SAE range without metric clutter, this kit covers nine sizes from #4 to 1/2 inch. The 910-piece total sits between the budget options and the 1000-piece kit above, but the size distribution is tuned toward #6 through 5/16 inch, which matches typical home and light-commercial applications. The Vifmy brand appears three times in this roundup, and build quality is consistent across their line.
- Pro: Balanced allocation that avoids overstocking extreme sizes you rarely need.
- Pro: Arrives in a labeled case that keeps sizes separated out of the box.
- Con: Slightly fewer pieces than similarly priced alternatives that include metric sizes.
Choose the combined SAE and Metric Vifmy kit instead if you have any chance of encountering imported fasteners.
1100 Pcs Spring Lock Washers Assortment Kit Metric M2-M12
This kit offers the highest piece count among metric-only options at 1100 pieces across nine sizes. The distribution is weighted toward M3-M8, which aligns with the bulk of consumer electronics and appliance hardware. Owners report consistent spring tension and no notable flat spots in the split geometry, meaning the washers deliver their designed locking force reliably.
- Pro: Largest metric piece count at a sub-$8 price, giving excellent per-washer value.
- Pro: Spring-back quality praised by owners across sizes, suggesting uniform gauge control.
- Con: Generic packaging with minimal labeling; you will need to rely on size estimation or a caliper to sort.
If the binifiMux kit wins on price, this wins on count. Pick based on which per-washer figure is lower for your usage pattern.
Neprift 40PCS M8 Spring Lock Washers
A single-size pack of 40 M8 split lock washers in stainless steel. This is not an assortment play; it is a targeted replenishment product for anyone who has depleted their M8 stock after a specific project. M8 is a common size in motorcycle fasteners, light structural brackets, and many industrial components.
- Pro: Lowest absolute price in the roundup; no need to buy a full kit for one size.
- Pro: Adequate count for most single-project needs without leftover clutter.
- Con: No size flexibility; if your project shifts to M6 or M10, you need another purchase.
Skip this unless you know your exact size requirement. For general use, any assortment kit provides better long-term value.
Buying Guide
Match the Size Standard to Your Hardware
Before selecting a kit, audit the fasteners you actually encounter. SAE kits suit domestic automotive, furniture, and legacy electrical work. Metric kits cover imported electronics, modern appliances, and most industrial hardware produced outside North America. Mixed kits cost more upfront but eliminate the scenario where you own the wrong standard mid-project. A simple rule: if more than 10 percent of your work involves imported components, a combined kit is worth the premium.
Evaluate Piece Distribution, Not Just Total Count
A 1780-piece kit sounds impressive, but if 200 pieces are M2 washers you will never touch, the effective value drops. Look at per-size breakdowns in product descriptions and owner reviews. Mid-range sizes (#8 through 5/16 inch for SAE, M3 through M8 for metric) carry the heaviest usage load. Kits that skew allocation toward these sizes deliver more usable hardware per dollar than kits that distribute evenly across all sizes.
Prioritize Packaging That Stays Organized
Spring lock washers are small, visually similar within a size group, and easy to mix. A kit that ships in labeled compartments or a structured case saves time on every future project. Bagged kits require you to transfer washers into your own organizer, which is a real cost in labor and additional containers. Owners of bagged products frequently mention this as the primary drawback, and it compounds over years of use.
Our Verdict
Our top pick is the Vifmy SAE & Metric 1780Pcs kit for anyone whose work spans both standards, because it eliminates redundant purchases and its compartment labeling keeps sorting friction at zero. For budget-conscious buyers, the 1100 Pcs Metric M2-M12 kit at $7.99 delivers the best per-washer value in a single standard. The condition under which the Ruibapa Flat + Spring combo wins: if your workflow consistently requires paired flat and lock washers on the same bolt, buying them pre-matched in one kit is more efficient than sourcing two separate products.
FAQ
Do 304 stainless spring lock washers rust?
304 stainless resists rust in normal indoor and moderate outdoor conditions, but it is not immune to all corrosion. Prolonged exposure to chlorides, salt spray, or stagnant water can cause surface pitting over years. For typical workshop and consumer electronics use, owners report no degradation.
Can I use spring lock washers with nylon-insert lock nuts?
Yes, though the combination is sometimes redundant. A nylon-insert nut already resists vibration loosening through its own mechanism, so adding a spring washer provides marginal additional benefit in most applications. It does no harm and can help if the nut is undersized for the load.
How many pieces do I need before an assortment beats buying individually?
For a single project requiring one or two sizes in quantities under 50, buying individually is cheaper. Assortment kits make financial sense once you need three or more sizes or anticipate future projects at unpredictable sizes. The breakeven for most kits on this list is roughly three distinct sizes.
Are metric and SAE washer sizes interchangeable?
They are close in some ranges but not identical. A 1/4-inch SAE washer has a larger bore than an M6 washer, for example, and the mismatch means the washer sits loosely or does not seat against the bolt head. Always match the standard to the fastener for proper load distribution and locking force.
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