Chipboard screws 4.0 x 70 partial thread

Strong 4.0 x 70 mm Wood Screws for Light to Medium-Duty Wood Connections

These 4.0 × 70 mm partial thread screws are designed for wood connections where good penetration depth and reliable clamping force are required. The screws are suitable for applications in solid wood, plywood, MDF, OSB and chipboard.

The Torx TX20 drive ensures optimal grip and efficient torque transfer during installation. This prevents cam-out and allows the screw to be driven in smoothly and with control — even with longer screws such as this 70 mm version.

The countersunk head sits neatly flush with the wood surface, providing a clean finish for both structural work and visible applications.

With a 4.0 mm diameter and 70 mm length, this size is ideal for general wood connections and fastening medium-thickness materials.

Why choose these chipboard screws?

✔ Ideal for 20–30 mm thick boards and sheet materials
✔ Partial thread — strongly pulls two wooden parts together
✔ 4.0 mm diameter — good balance between strength and ease of use
✔ Torx TX20 — optimal grip with reduced risk of cam-out
✔ Suitable for interior work and light constructions
✔ Pack of 200 pieces — ideal for larger jobs

When do you use 4.0 x 70 mm screws?

A 4.0 × 70 mm partial thread chipboard screw is used when a strong wood connection with sufficient penetration depth is required.

Typical applications include:

• Fixing 20–30 mm thick boards
• Installing MDF, plywood and chipboard
• Furniture assembly and interior construction
• Battens and light framework
• General wood-to-wood connections

Chipboard screws are specifically designed for wood and sheet materials, ensuring a strong connection while reducing the risk of splitting.

Why is 70 mm a logical length?

For a board thickness of approximately 25 mm, the general guideline is:

The screw should penetrate at least 2.5 to 3 times the thickness of the top material into the supporting wood.

25 mm × ±2.8 ≈ 70 mm

Using a 70 mm screw ensures:

✔ Sufficient penetration depth
✔ Good pull-out resistance
✔ A stable connection

This makes 4.0 × 70 mm a versatile choice for wood and sheet materials.

What makes these 4.0 x 70 mm screws suitable for MDF, plywood and solid wood?

When working with medium-thickness materials, it is important that:

• The top material is firmly pulled down
• The connection remains stable under load
• The screw provides sufficient grip

Thanks to the partial thread, two wooden parts are pulled tightly together, creating a strong and clean connection.

The 4.0 mm diameter provides sufficient strength without damaging the material.

Advantages of partial thread at 4.0 x 70 mm

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

This results in:

✔ Better clamping force between two parts
✔ Tighter material connection
✔ Reduced risk of gaps or open joints
✔ Efficient wood-to-wood fastening

For wood connections, partial thread is often the best choice.

Installation and mounting advice

For best results:

• Use a Torx TX20 bit
• Pre-drilling is usually not required in softwood
• Pre-drilling is recommended in hardwood
• Drive the screw slowly and in a controlled manner

Tip: See our category for screwdriver bits and bit holders for the correct bit size and professional-quality tools.

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

This way, you order not only the correct screws but also the necessary tools for efficient installation.

Not sure about the right length? Also view our 4.0×50 mm and 4.0×60 mm variants for slightly thinner materials.