Chipboard Screws 4.5 x 70 mm partial thread

Reliable 4.5x70 mm Wood Screws for Strong Wood-to-Wood Connections

These 4.5 × 70 mm partial thread chipboard screws are designed for strong and stable wood connections in solid wood, plywood, MDF, and particleboard. The zinc-plated finish makes them suitable for indoor applications and provides protection against light corrosion.

The Torx TX20 drive ensures optimal grip during installation and prevents cam-out. The countersunk head sits flush with the wood surface, creating a clean finish without protruding screw heads.

With a 4.5 mm diameter and 70 mm length, this size is particularly suitable for medium-duty to structural wood connections.

Why choose these chipboard screws?

✔ Ideal for boards and battens 26–28 mm thick
✔ Partial thread profile — powerfully pulls wood sections together
✔ 4.5 mm diameter — higher load capacity than 4.0 mm
✔ Torx TX20 — prevents slipping and damage
✔ Zinc-plated — suitable for indoor use
✔ Pack of 200 pieces — ideal for larger projects

When should you use 4.5 x 70 mm screws?

A 4.5x70 mm partial thread chipboard screw is used for medium-duty wood joints where sufficient penetration depth and clamping force are required.

This size is commonly used for:

• Fixing boards 26–28 mm thick
• Connecting framing and wooden beams
• Interior construction and furniture making
• Installing thick plywood or furniture panels
• Wood-to-wood connections requiring higher pull-out resistance

Why is 70 mm a logical length?

When fastening 28 mm material, the practical rule of thumb is:
The screw should penetrate at least 2.5 to 3 times the thickness of the top material into the lower wood section.

28 mm × 2.5 = 70 mm

This ensures:

• Sufficient penetration depth
• High pull-out resistance
• Improved structural stability
• Reduced risk of loosening

This makes 4.5 x 70 mm a widely chosen size for solid wood constructions.

What makes these 4.5x70 screws suitable for MDF, plywood, and solid wood?

With thicker wood sections, it is important that:

• The top material is firmly pulled down
• The joint does not remain under tension
• The screw provides sufficient grip in the load-bearing wood

Thanks to the partial thread, only the lower section of the screw grips into the wood. This actively pulls the top material downward, ensuring a tight and stable joint.

The 4.5 mm diameter also provides additional torsional strength and bending resistance during deeper installation.

Advantages of partial thread in 4.5x70 mm screws

Unlike fully threaded screws, this version has thread only on the lower section.

This results in:

✔ Higher clamping force between two wooden parts
✔ Better tightening in beam-to-beam connections
✔ Reduced risk of visible gaps
✔ More efficient wood-to-wood fastening

For structural wood connections, partial thread is often more effective than full thread.

Installation and mounting advice

For optimal installation:

• Use a Torx TX20 bit
• Pre-drilling is usually not required in softwood
• A pilot hole is recommended in hardwood
• Drive the screw in steadily for maximum grip

Tip: Check our category for screwdriver bits and holders to select the correct bit size and quality.

Why order these screws from EnergyBy?

✔ Directly available from stock
✔ Competitive price per pack
✔ Clear and complete product specifications per size
✔ Fast and reliable delivery
✔ Matching Torx bits and fastening materials available for direct ordering

This ensures you not only order the right chipboard screws, but also the necessary tools for efficient installation.

Not sure about the right length? Also view our 4.5x50 mm and 4.5x60 mm variants for thinner materials.

Frequently Asked Questions

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