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Home / Screws / M3 M4 M5 M6 M8 304 Stainless Steel Countersunk Flat Head Cross Screw Nut Washer Kit, Extra-Long Combination Screws

Attributes

Brand -
Category Standard Parts, Components & Industrial Consumables / Screws
Origin -
Material 304 Stainless Steel
Head Style Countersunk Flat Head
Drive Type Cross (Phillips)
Available Sizes M3, M4, M5, M6, M8
Thread Length Extra-Long
Finish Polished Silver
Included Components Screws, Nuts, Washers
Corrosion Resistance High (Indoor/Outdoor Use)
Application Woodworking, Metal Assembly, DIY Projects
Package Type Organized Storage Box

6 reviews

A

Anonymous

Mar 20, 2026

Rating: 4/5

Great variety pack

Having all these sizes in one box is very convenient. The washers fit perfectly. I took off one star because the M8 count was slightly lower than expected, but overall a great value.

A

Anonymous

Mar 17, 2026

Rating: 5/5

High quality stainless steel

I used these for an outdoor fence repair. After several months of rain, there is absolutely no rust. The countersunk head sits flush every time.

A

Anonymous

Mar 13, 2026

Rating: 5/5

Perfect for my woodworking projects

The extra-long length was exactly what I needed for thick lumber. The stainless steel quality is top-notch and they drive in smoothly without stripping.

A

Anonymous

Mar 10, 2026

Rating: 5/5

Excellent value for money

You get a huge quantity for the price. The 304 steel is genuine as tested with my magnet kit (slightly magnetic due to cold working, which is normal). Highly recommended.

A

Anonymous

Mar 10, 2026

Rating: 5/5

Essential for any toolkit

This kit saved me a trip to the hardware store multiple times already. The organization box is sturdy and keeps everything sorted by size.

A

Anonymous

Mar 04, 2026

Rating: 4/5

Good threads, sharp points

The threading is clean and consistent. They bite into wood easily. Just be careful with the sharp points when digging through the box.

5 FAQ

Q: Are these screws suitable for use in marine environments?

A: While 304 stainless steel offers excellent corrosion resistance for most outdoor applications, we recommend 316 stainless steel for direct, constant exposure to saltwater marine environments.

Q: Is the storage box stackable?

A: Yes, the included storage box features a interlocking lid design that allows multiple units to be stacked securely on top of each other.

Q: Can these be used with aluminum sheets without causing galvanic corrosion?

A: Stainless steel can cause galvanic corrosion when in direct contact with aluminum in the presence of an electrolyte. We suggest using a barrier washer or sealant if using them together in wet conditions.

Q: Does the kit come with a screwdriver bit?

A: No, this kit includes only the screws, nuts, and washers organized in a storage box. A Phillips head screwdriver or bit is not included.

Q: What is the exact length of the 'extra-long' M4 screws?

A: The extra-long M4 screws in this kit are 50mm in total length. Please refer to the detailed size chart in the product images for specific lengths of other sizes.

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