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Home / Screws / Hardened Blue-White Zinc Plated Large Flat Head Self-Tapping Screw High-Strength Cross Wood Screw M3 M4 M5 M6

Attributes

Brand -
Category Standard Parts, Components & Industrial Consumables / Screws
Origin -
Material Carbon Steel
Surface Treatment Blue-White Zinc Plated
Head Style Flat Head (Countersunk)
Drive Type Cross (Phillips)
Thread Type Self-Tapping
Available Sizes M3, M4, M5, M6
Hardness Grade High-Strength Hardened
Application Wood, Plastic, Thin Metal
Color Silver with Blue-White Tint
Package Type Bulk Box or Retail Pack

6 reviews

A

Anonymous

Mar 28, 2026

Rating: 5/5

Excellent quality for woodworking projects

These screws are incredibly sharp and drive smoothly into hardwood without pre-drilling in most cases. The zinc plating looks durable and should resist rust well in my workshop environment.

A

Anonymous

Mar 21, 2026

Rating: 5/5

Perfect for delicate woodwork

The self-tapping feature works wonderfully on softwoods like pine. No splitting occurred, which was my main concern. Highly recommend for hobbyists.

A

Anonymous

Mar 20, 2026

Rating: 4/5

Great value, strong hold

Bought the M4 size for assembling furniture. They hold very tightly and the flat head sits perfectly flush. One star off because a couple in the box had slightly stripped heads, but overall great value.

A

Anonymous

Mar 16, 2026

Rating: 4/5

Solid screws, fast shipping

Good strength and the cross drive engages well. I used them for decking subframes. They seem robust enough for structural applications indoors.

A

Anonymous

Mar 15, 2026

Rating: 5/5

Professional grade fasteners

I use these daily for cabinetry. The hardened steel prevents snapping even under high torque from my impact driver. The blue-white finish is consistent across the batch.

A

Anonymous

Mar 11, 2026

Rating: 5/5

Exactly what I needed

Replaced some old rusty screws on my garden shed door with these M5 ones. They look clean, fit perfectly, and were easy to install with a standard screwdriver.

5 FAQ

Q: Do you sell these in individual sizes or only mixed kits?

A: We offer both options. You can purchase boxes containing a single specific size (e.g., only M4) or choose our variety kit that includes an assortment of M3 through M6 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 ideal for quick insertion and strong holding power in wood and plastic materials.

Q: Do these screws require pre-drilling for oak wood?

A: For hard woods like oak, we recommend pre-drilling a pilot hole slightly smaller than the screw diameter to prevent splitting and ensure easier driving, although the self-tapping design helps significantly.

Q: Are these suitable for outdoor use?

A: While the blue-white zinc plating offers good corrosion resistance, these are best suited for indoor applications. For prolonged outdoor exposure, we suggest our stainless steel or hot-dip galvanized series.

Q: Can I use these with an electric impact driver?

A: Yes, these screws are hardened and designed to withstand the torque of electric impact drivers. However, please ensure your driver is set to the appropriate clutch setting to avoid over-driving.

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