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Home / Screws / 304 Stainless Steel Round Head Screw and Nut Combo Set with Bolts, Flat Washers, and Spring Washers M3 M4 M5 M6 mm

Attributes

Brand -
Category Standard Parts, Components & Industrial Consumables / Screws
Origin -
Material 304 Stainless Steel
Head Style Round Head
Included Sizes M3, M4, M5, M6
Finish Polished Silver
Thread Type Metric Coarse
Drive Type Phillips (Cross)
Washer Types Included Flat Washers and Spring Washers
Corrosion Resistance High (Suitable for Indoor/Outdoor)
Package Contents Screws, Nuts, Flat Washers, Spring Washers
Application General Machinery, Electronics, Furniture Assembly

6 reviews

A

Anonymous

Mar 25, 2026

Rating: 5/5

Must-have for the workshop

This combo set is a staple in my toolbox now. The polish is nice, and they don't strip easily when tightened. It's great to have a go-to box for various metric sizes without buying individual packs.

A

Anonymous

Mar 19, 2026

Rating: 5/5

Perfect for electronics projects

I use these primarily for mounting components in custom PC builds and robotics. The threads are precise and engage smoothly with the nuts. Having both flat and spring washers included saves me a trip to the hardware store.

A

Anonymous

Mar 11, 2026

Rating: 5/5

Excellent quality stainless steel

These screws are exactly what I needed for my outdoor project. The 304 stainless steel feels very durable and hasn't shown any signs of rust after a few weeks in the rain. The variety of sizes in one box is incredibly convenient.

A

Anonymous

Mar 04, 2026

Rating: 5/5

No rust issues so far

Bought these for a garden trellis project. After two months of exposure to humidity and watering, there is zero corrosion. The round head design also prevents snagging on clothing, which is a nice bonus.

A

Anonymous

Mar 03, 2026

Rating: 4/5

Great value kit

Good assortment of M3 to M6 bolts. The round heads look clean on my furniture assembly. I took off one star because the plastic organizer box was slightly cracked upon arrival, but the hardware itself is perfect.

A

Anonymous

Mar 03, 2026

Rating: 4/5

Solid hardware, good selection

The quality is consistent across all sizes. I used the M5 and M6 bolts for a shelf bracket repair, and they hold very securely. The only improvement would be including a small storage divider inside the box.

5 FAQ

Q: Is the packaging resealable?

A: Yes, the set comes in a sturdy plastic compartmentalized box with a snap-on lid, making it easy to open and close for organized storage of leftover hardware.

Q: Does this set include an Allen key or screwdriver?

A: No, this kit contains only the fasteners (screws, nuts, and washers). Tools are not included. You will need a standard Phillips head screwdriver appropriate for the M3-M6 sizes.

Q: Can these be used in saltwater environments?

A: While 304 Stainless Steel offers good corrosion resistance, it is not recommended for direct, prolonged submersion in saltwater. For marine environments, 316 Stainless Steel is typically preferred. These are suitable for general outdoor use.

Q: What is the thread pitch for the M4 bolts?

A: The M4 bolts in this set feature a standard coarse thread pitch of 0.7mm, which is the default for metric M4 fasteners unless specified otherwise as fine thread.

Q: Are these screws magnetic?

A: 304 Stainless Steel is generally non-magnetic or very weakly magnetic. These screws may show a slight attraction to strong magnets due to the cold-heading manufacturing process, but they are not strongly magnetic like carbon steel.

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