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

Attributes

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

6 reviews

A

Anonymous

Mar 24, 2026

Rating: 5/5

Professional grade

We use these for our manufacturing prototypes. They hold torque well without stripping the socket. Will definitely order again.

A

Anonymous

Mar 21, 2026

Rating: 4/5

Good quality, fast shipping

The material feels solid and durable. I used the M4 size for a computer case modification. Only giving 4 stars because the packaging was a bit loose, but the screws themselves are great.

A

Anonymous

Mar 20, 2026

Rating: 5/5

Excellent corrosion resistance

I installed these in an outdoor garden fixture months ago, and there is absolutely no sign of rust. Highly recommend for any exterior applications.

A

Anonymous

Mar 12, 2026

Rating: 4/5

Solid construction

Very sturdy screws. The flat head sits flush as expected. I wish the kit came with a small organizer box, but the quality of the metal is top-notch.

A

Anonymous

Mar 07, 2026

Rating: 5/5

Perfect fit for my project

These screws are exactly what I needed for assembling my custom shelving unit. The hex socket fits perfectly with my Allen key set, and the stainless steel looks very professional.

A

Anonymous

Mar 05, 2026

Rating: 5/5

Great variety pack

Having access to sizes from M2 up to M12 in one place saved me a trip to the hardware store. The threads are clean and cut precisely.

5 FAQ

Q: What tool do I need to install these?

A: You will need a hex key (also known as an Allen wrench) that matches the specific size of the screw socket. For example, an M4 screw typically requires a 2.5mm hex key.

Q: Do you sell these individually or only in packs?

A: We primarily sell them in bulk packs or assorted kits for convenience. However, you can select specific quantities for individual sizes during checkout depending on current stock availability.

Q: Can these be used in saltwater environments?

A: While 304 stainless steel offers good corrosion resistance, for constant submersion in saltwater, we recommend 316 marine-grade stainless steel for optimal longevity. These are suitable for splash zones or humid outdoor air.

Q: Are these screws magnetic?

A: 304 stainless steel is generally non-magnetic or only slightly magnetic due to the cold working process during manufacturing. They will not stick strongly to a magnet like carbon steel screws.

Q: What is the thread pitch for the M6 size?

A: The M6 screws feature a standard coarse thread pitch of 1.0mm, which is the industry standard for metric hex socket cap screws unless otherwise specified as fine thread.

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