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Home / Screws / 304 Stainless Steel Countersunk Socket Head Screw Flat Head Flat Cup Bolt Screw M2 M3 M4 M5 M6 M8 M10 M12 M16

Attributes

Brand -
Category Standard Parts, Components & Industrial Consumables / Screws
Origin -
Material 304 Stainless Steel
Head Style Countersunk Flat Head
Drive Type Hex Socket (Allen)
Thread Standard Metric Coarse
Available Sizes M2, M3, M4, M5, M6, M8, M10, M12, M16
Finish Polished Silver
Corrosion Resistance High (Suitable for Indoor/Outdoor)
Tensile Strength Standard Grade A2-70
Packaging Bulk Box or Custom Bag
Application Machinery, Electronics, Furniture Assembly

6 reviews

A

Anonymous

Mar 20, 2026

Rating: 4/5

Good bulk value

Bought a large box of M6 screws for furniture assembly. Most are perfect, though I found one or two with slightly stripped threads. Overall great value for the price.

A

Anonymous

Mar 16, 2026

Rating: 5/5

Fast shipping and well packed

Needed M3 screws urgently for a repair job. They arrived quickly and were sorted neatly in the box. No mixing of sizes which I appreciate.

A

Anonymous

Mar 16, 2026

Rating: 5/5

High quality 304 steel

Using these for an outdoor garden structure. After three months of rain, there is absolutely no rust. The flat head sits flush as expected.

A

Anonymous

Mar 12, 2026

Rating: 5/5

Excellent for machinery maintenance

We use these M8 and M10 bolts for maintaining conveyor belts in our factory. They hold up well under vibration and are easy to source in bulk.

A

Anonymous

Mar 04, 2026

Rating: 3/5

Decent but heads vary slightly

The threads are fine, but the angle on the countersunk head varies slightly between batches. Works for most applications but not for precision aerospace work.

A

Anonymous

Mar 03, 2026

Rating: 5/5

Perfect fit for my project

Ordered the M4 size for a custom electronics enclosure. The hex socket is deep enough for good torque, and the stainless steel quality looks excellent. Will order again.

5 FAQ

Q: Are these screws magnetic?

A: 304 Stainless Steel is generally non-magnetic or very weakly magnetic due to its austenitic structure, making it ideal for sensitive electronic applications.

Q: What is the thread pitch for the M5 size?

A: The M5 screws feature a standard coarse thread pitch of 0.8mm unless otherwise specified in the product variation.

Q: Do these screws come with matching hex keys?

A: No, these are sold as bulk hardware only. Hex keys are not included in the package.

Q: Is this material suitable for marine environments?

A: While 304 stainless steel offers good corrosion resistance, we recommend 316 stainless steel for direct saltwater or harsh marine applications.

Q: Can I mix sizes in one order?

A: Yes, you can select different sizes and quantities from the dropdown menu before adding to your cart. They will be shipped together.

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