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Home / Screws / 304 Stainless Steel Extra Large Extra Long Full Thread Socket Head Cap Screw Cylinder Head Screw M3 M4 M5 M6 M8-M30

Attributes

Brand -
Category Standard Parts, Components & Industrial Consumables / Screws
Origin -
Material 304 Stainless Steel
Head Style Socket Head Cap (Cylinder)
Drive Type Hex Socket (Allen)
Thread Type Full Thread (Coarse)
Available Sizes M3, M4, M5, M6, M8, M10, M12, M16, M20, M24, M30
Finish Polished Silver
Strength Grade A2-70
Corrosion Resistance High (Suitable for damp environments)
Application Machinery, Automotive, Construction, DIY Projects
Package Content Assorted Kit or Bulk Pack (Selected at Checkout)

6 reviews

A

Anonymous

Mar 17, 2026

Rating: 5/5

Perfect for machinery repair

Used the M8 and M10 sizes to repair a conveyor belt mechanism. The hex socket fits perfectly with standard Allen keys, and the full thread provided excellent grip.

A

Anonymous

Mar 12, 2026

Rating: 4/5

Good variety but packaging could be better

The screws themselves are great quality and the threads are precise. However, the small sizes were all mixed together in one bag. Would prefer separate compartments for each size.

A

Anonymous

Mar 08, 2026

Rating: 5/5

Excellent quality stainless steel

These screws are exactly what I needed for my outdoor project. The 304 stainless steel feels robust and the finish is very clean. No signs of rust after a few weeks in the rain.

A

Anonymous

Mar 07, 2026

Rating: 5/5

Great value for bulk purchase

Bought the M4 and M5 assortment for general workshop use. The price per unit is unbeatable compared to local hardware stores. Will definitely buy again.

A

Anonymous

Mar 07, 2026

Rating: 5/5

Heavy duty and reliable

Needed extra long screws for a custom furniture build. These M6 extra-long variants were perfect. Very sturdy and the cylinder head looks professional.

A

Anonymous

Mar 07, 2026

Rating: 3/5

Decent but some heads were stripped

Most of the screws are fine, but I found about three in the pack where the hex socket was slightly deformed, making them hard to drive. The rest worked flawlessly.

5 FAQ

Q: Do you sell matching nuts and washers for this set?

A: Yes, we offer compatible 304 stainless steel hex nuts and flat washers in all corresponding sizes. Please check the 'Related Products' section on the product page.

Q: Can I return the item if I selected the wrong size?

A: Absolutely. As long as the items are unused and in original packaging, you can initiate a return within 30 days of delivery for a full refund or exchange.

Q: Are these screws suitable for marine environments?

A: While 304 stainless steel offers good corrosion resistance, for constant exposure to saltwater, we recommend our 316 stainless steel series for superior protection.

Q: Is there a certificate of material compliance included?

A: For bulk orders over 500 units, a material test report (MTR) can be provided upon request. For smaller kits, general specification sheets are available for download.

Q: What is the tensile strength of these M6 screws?

A: These screws are graded A2-70, which indicates a minimum tensile strength of 700 MPa.

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