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Home / Screws / Carbon Steel Black Countersunk Cross Screw Nut Set Combination Complete Flat Head Screw Cap Flat Washer Spring Washer M3 M4

Attributes

Brand -
Category Standard Parts, Components & Industrial Consumables / Screws
Origin -
Material Carbon Steel
Finish Black Oxide
Head Style Countersunk Flat Head
Drive Type Cross (Phillips)
Included Sizes M3, M4
Components Screw, Cap Nut, Flat Washer, Spring Washer
Thread Type Metric Coarse
Application General Machinery Assembly
Corrosion Resistance Moderate (Indoor Use)
Package Type Assorted Kit Box

6 reviews

A

Anonymous

Mar 26, 2026

Rating: 5/5

Perfect for my workshop projects

This set has everything I needed for assembling my custom shelving unit. The black finish looks professional and the washers fit perfectly.

A

Anonymous

Mar 26, 2026

Rating: 5/5

Exactly as described

Fast shipping and the packaging kept everything organized. The flat head design sits flush with the surface nicely.

A

Anonymous

Mar 23, 2026

Rating: 5/5

High quality carbon steel

The metal feels solid and the cross heads didn't strip even under high torque. Highly recommended for DIY enthusiasts.

A

Anonymous

Mar 19, 2026

Rating: 4/5

Solid hardware set

Used these for repairing a small appliance. The spring washers provide good tension. Good purchase overall.

A

Anonymous

Mar 15, 2026

Rating: 5/5

Best seller for a reason

I keep coming back to this brand for fasteners. Consistent quality and the black coating prevents minor rusting in my garage.

A

Anonymous

Mar 11, 2026

Rating: 4/5

Good value kit

Great variety of sizes in one box. The M4 screws are very sturdy. Only wish there were a few more M3 nuts included.

5 FAQ

Q: Can I buy just the M4 size?

A: This specific listing is for the combination set. We do offer separate packs of only M4 screws in our store if you search by SKU.

Q: Is the thread metric or imperial?

A: All screws and nuts in this set use standard Metric threading (M3 and M4).

Q: What is the length of the M3 screws?

A: The assortment includes multiple lengths for M3, typically ranging from 6mm to 20mm, as detailed in the package contents list.

Q: Are these suitable for outdoor use?

A: While the black oxide finish offers some protection, these are carbon steel and best suited for indoor applications to prevent rust over time.

Q: Does this set include a driver bit?

A: No, this kit contains only the screws, nuts, and washers. A Phillips head screwdriver is required separately.

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