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Home / Screws / Carbon Steel Black Countersunk Cross Screw and Nut Set Combination Assortment with Flat Head Screws, Caps, Flat Washers, and Spring Washers M3 M4

Attributes

Brand -
Category Standard Parts, Components & Industrial Consumables / Screws
Origin -
Material Carbon Steel
Finish Black Oxide Coated
Head Style Countersunk Flat Head
Drive Type Cross (Phillips)
Included Sizes M3 and M4
Components Screws, Nuts, Flat Washers, Spring Washers
Thread Type Metric Coarse
Package Type Assortment Kit Box
Corrosion Resistance Moderate (Indoor Use Recommended)
Application General Machinery, Electronics, Furniture Assembly

6 reviews

A

Anonymous

Mar 28, 2026

Rating: 5/5

Exactly as described

I use these for assembling custom PC cases and small appliances. The M3 and M4 sizes are the most common ones I need, and this set covers them all.

A

Anonymous

Mar 27, 2026

Rating: 4/5

Solid basic hardware

Nothing fancy, just reliable carbon steel fasteners. The spring washers provide good tension. Would buy again for general maintenance.

A

Anonymous

Mar 26, 2026

Rating: 5/5

Great for furniture assembly

Bought this to replace lost hardware from a flat-pack desk. The countersunk heads sit perfectly flush with the surface.

A

Anonymous

Mar 25, 2026

Rating: 5/5

Perfect assortment for my workshop

This kit has everything I needed for several small repair jobs. The black finish looks professional and the screws fit tightly without stripping.

A

Anonymous

Mar 14, 2026

Rating: 4/5

Good value, minor packaging issue

The quality of the steel is excellent for the price. One compartment in the box was slightly cracked on arrival, but no parts were missing.

A

Anonymous

Mar 06, 2026

Rating: 5/5

Handy to have around

Having nuts and washers included saves a trip to the hardware store. The black coating seems durable so far after a few months of use.

5 FAQ

Q: Are these screws suitable for outdoor use?

A: While they have a black oxide coating, carbon steel is prone to rust in wet environments. We recommend using stainless steel alternatives for prolonged outdoor exposure.

Q: Does this kit include a screwdriver?

A: No, this assortment contains only the fasteners (screws, nuts, and washers). Tools are not included.

Q: Is the box resealable for storage?

A: Yes, the kit comes in a sturdy plastic compartmentalized box with a snap-on lid designed for easy organization and reuse.

Q: Can I buy just the M3 nuts separately?

A: Currently, we only sell this item as a complete combination set. Individual components are not available for separate purchase.

Q: What is the length range of the M4 screws included?

A: The M4 screws in this specific assortment typically range from 6mm to 20mm in length, covering most standard application needs.

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