Best Machine Screws
Quick answer
For most buyers, the 720Pcs Machine Screw Assortment Kit is the strongest overall pick since it pairs a wide #4-40 to #10-24 SAE range with stainless steel construction, washers, and a storage case in one balanced kit.
Why trust ToolBuyerHub
- Cross-checked manufacturer-published specifications before writing any recommendation
- Verified US market availability and configuration for every model discussed
- Owner-feedback themes are summarized as feedback, never presented as our own hands-on testing
- No invented star ratings; see the visible Research Score criteria on this page
- Checked included-item lists against manufacturer packaging information
Research updated September 2026.
What Matters Most for This Category
The most important factor when choosing a machine screw assortment is matching the thread standard, SAE or metric, to the equipment you're actually repairing, since mixing them up wastes half a kit. After that, check the size range covered (smaller electronics often need #4-40 or M3, while appliances lean toward #10-24 or M6), whether nuts and washers are included for complete assemblies, and whether the material (typically 304 stainless) and finish suit your environment.
| Model | Best for | Key specs | Research Score |
|---|---|---|---|
| Fgruh 358PCS #6-32#8-32#10-24 Pan Head Machine Screws Nuts Assortment Kit | Best Compact Starter Kit | Fgruh, Check current price | 90/100 |
| 720Pcs Machine Screw Assortment Kit, #10-24#8-32#6-32#4-40 Phillips Pan Head Assorted Nuts Bolts and Flat Washers Kit, Stainless Steel Screws Hardware Assortment with Case | Best Overall | n/a, Check current price | 87/100 |
| SVLING 537Pcs M3 M4 M5 M6 Bolts Assortment Kit, Metric Machine Screws Phillips Pan Head Nuts Bolts Washer Assortment Kit, 304 Stainless Steel for Household Repairs,Electrical Wall Plate Switch | Best for Metric Projects | SVLING, Check current price | 84/100 |
| wugongshan 1080 Pcs Screws Bolts and Nuts Assortment Kit, Metric Machine Screws and Nuts and Flat Washers, M3/M4/M5/M6 Cross Slotted Round Head Bolts Sets (C) | Best Value for Bulk Metric Stock | wugongshan, Check current price | 81/100 |
| Bemaka 408PCS Machine Screws Nuts and Bolts Assortment Kit, 304 Stainless Steel Bolts #6-32#8-32#10-24 M3 M4 M5 Phillips Pan Head Hardware Screw Assortment Kit, Assorted Bolts, Nuts and Washers Kit | Best for Mixed SAE and Metric Needs | Bemaka, Check current price | 79/100 |
| Deohsyly 162Pcs Machine Screws Assortment kit, #8-32 Machine Screw,304 Stainless Steel Phillips Pan Head Screws Bolts Black Oxide, with Tool | Best for Single Size Projects | Deohsyly, Check current price | 76/100 |
| KADRICK 920Pcs Machine Screw Assortment Kit,Stainless Steel #4-40 to #10-24 | Best for Wide SAE Size Range | KADRICK, Check current price | 75/100 |
Fgruh 358PCS #6-32#8-32#10-24 Pan Head Machine Screws Nuts Assortment Kit
Best Compact Starter KitPros
- Covers the three SAE sizes used most often in appliance and electronics repair (#6-32, #8-32, #10-24)
- Pan head design suits general fastening where a low profile isn't critical
- Compact piece count keeps the kit easy to store and inventory
Cons
- Limited to SAE sizing only, with no metric options for imported hardware
- Smaller piece count means fewer spares for larger or repeat projects
This kit bundles pan head machine screws in the three most common SAE sizes, #6-32, #8-32, and #10-24, along with matching nuts for general household and electronics repairs. At 358 pieces it favors a compact, focused assortment over sheer volume, making it easy to keep organized in a small case.
720Pcs Machine Screw Assortment Kit, #10-24#8-32#6-32#4-40 Phillips Pan Head Assorted Nuts Bolts and Flat Washers Kit, Stainless Steel Screws Hardware Assortment with Case
Best OverallPros
- Adds #4-40 sizing for smaller electronics and hobby hardware beyond the typical #6-32 to #10-24 range
- Stainless steel construction resists rust for both indoor and light outdoor use
- Included flat washers and a storage case round out the kit for organized repairs
Cons
- SAE only sizing won't help with metric equipment or imported fixtures
- Larger piece count and case add bulk compared to smaller pocket kits
This 720 piece kit expands SAE coverage down to #4-40 and pairs Phillips pan head screws with matching nuts and flat washers, all in stainless steel. The included storage case keeps the four size ranges separated for quick access during repairs.
SVLING 537Pcs M3 M4 M5 M6 Bolts Assortment Kit, Metric Machine Screws Phillips Pan Head Nuts Bolts Washer Assortment Kit, 304 Stainless Steel for Household Repairs,Electrical Wall Plate Switch
Best for Metric ProjectsPros
- Metric only range from M3 to M6 matches imported electronics, appliances, and switch plate hardware
- 304 stainless steel offers solid corrosion resistance for household use
- Washers included alongside nuts for a more complete metric fastening kit
Cons
- No SAE sizing, so it won't cover US standard appliance screws
- Range tops out at M6, leaving larger metric fasteners uncovered
This kit focuses on metric Phillips pan head machine screws in M3 through M6, paired with nuts and washers in 304 stainless steel. It's positioned for household repairs and electrical work such as wall plate and switch hardware where metric fasteners are common.
wugongshan 1080 Pcs Screws Bolts and Nuts Assortment Kit, Metric Machine Screws and Nuts and Flat Washers, M3/M4/M5/M6 Cross Slotted Round Head Bolts Sets (C)
Best Value for Bulk Metric StockPros
- Highest piece count among the metric kits, reducing how often you need to restock
- Covers M3 to M6 with nuts and washers included for complete fastening jobs
- Round head style suits general purpose metric repairs and assembly
Cons
- No SAE sizes, so it doesn't help with US standard threaded hardware
- Bulk piece count means a larger case to store and organize
With 1080 pieces, this is the largest metric kit in the lineup, covering M3 through M6 cross slotted round head bolts alongside matching nuts and flat washers. The high piece count suits buyers who go through metric fasteners quickly or want deep backup stock across four common sizes.
Bemaka 408PCS Machine Screws Nuts and Bolts Assortment Kit, 304 Stainless Steel Bolts #6-32#8-32#10-24 M3 M4 M5 Phillips Pan Head Hardware Screw Assortment Kit, Assorted Bolts, Nuts and Washers Kit
Best for Mixed SAE and Metric NeedsPros
- Combines SAE (#6-32, #8-32, #10-24) and metric (M3, M4, M5) sizes in one kit, useful when project hardware standards vary
- 304 stainless construction holds up to repeated handling and mild moisture exposure
- Washers included alongside screws and nuts for finished assemblies
Cons
- Splitting piece count across six size ranges means fewer of any single size compared to single standard kits
- Metric range stops at M5, missing the larger M6 size some fixtures need
This kit is one of the few here to mix both SAE and metric sizing in a single 408 piece assortment, all in 304 stainless steel with Phillips pan heads. It also includes matching washers, making it a dual standard option for shops that work on both US and imported equipment.
Deohsyly 162Pcs Machine Screws Assortment kit, #8-32 Machine Screw,304 Stainless Steel Phillips Pan Head Screws Bolts Black Oxide, with Tool
Best for Single Size ProjectsPros
- Single size focus means deep stock of #8-32 without paying for sizes you won't use
- Black oxide finish adds a darker, low glare look distinct from bare stainless kits
- Includes a driver tool, useful if you don't already have the right bit on hand
Cons
- Limited to one screw size, so it won't cover general assortment needs beyond #8-32
- Smallest piece count in this lineup, meaning less overall backup stock
This kit narrows its focus to a single size, #8-32, in 304 stainless steel with a black oxide finish, and includes a driver tool for installation. The smaller 162 piece count and single size focus suit projects where #8-32 is the only screw needed in volume.
KADRICK 920Pcs Machine Screw Assortment Kit,Stainless Steel #4-40 to #10-24
Best for Wide SAE Size RangePros
- Covers the full common SAE range from #4-40 to #10-24 in one kit
- High piece count of 920 supports repeated repairs without running out
- Stainless steel construction resists corrosion in household and workshop settings
Cons
- SAE only, so metric hardware needs still require a separate kit
- Listing doesn't specify included washers or a case, unlike some competing kits
This kit spans the SAE range from #4-40 up to #10-24 with 920 pieces of stainless steel machine screws. The wide size range and high count target buyers who need broad SAE coverage without switching to metric options.
Who Should Avoid the Top Pick
Buyers who need a large quantity of a single exact screw size for one project are usually better off buying that size in bulk rather than an assortment kit, since only a fraction of the pieces will match. These kits also aren't the right fit for specialty fasteners like security screws, self-tapping sheet metal screws, or machine screws outside the #4-40 to M6 range these assortments cover.
Before You Buy
Before ordering, measure or check the existing screws on your project to confirm whether you need SAE or metric threads and the specific diameter, since the two standards aren't interchangeable. It also helps to confirm the head style (Phillips pan head is standard across these kits) fits your existing tools or the driver tool included, and to check whether nuts and washers are bundled if your repair needs a full assembly rather than just a screw.
FAQs
How do I choose machine screws?
Match the thread standard first, SAE or metric, by checking an existing screw or the equipment's manual, then confirm the specific size (like #8-32 or M4) and head style needed. From there, prioritize kits that include matching nuts and washers if your repair needs a full assembly, and favor stainless steel or a corrosion resistant finish if the screws will see moisture or frequent handling.
Our verdict
Any of these seven kits can cover common household, electronics, or appliance repairs, but the right one depends on whether your hardware is SAE or metric and how wide a size range you need. The 720Pcs kit offers the most balanced SAE coverage with washers and a case included, while the wugongshan 1080 Pcs kit is the better choice for buyers who specifically need deep metric stock.