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SPAX 4577000450357 mortise screw, 4.5 x 35 m

Supplier number: SPAX 4577000450357 | EAN 4003530266836
0.34 tax incl.
€0.28 excl. VAT (incl. all environmental contributions)
On stock - immediately available

The minimum purchase order quantity for the product is 60.

  • Ordered before 20:00 - delivered tomorrow 30/09/2026
  • Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
  • Delivery by DHL
  • Delivered from Belgium

Weatherproof fastening with Spax plumbing screws

Practical benefits
  • Reliable watertight seal: The integrated 20 mm sealing washer effectively prevents rainwater from penetrating drilled holes in your roof cladding.
  • Durable corrosion resistance: Manufactured from A2 stainless steel, it delivers lasting resistance against outdoor weather conditions and rust.
  • Effortless driving precision: The 4CUT tip combined with the T-STAR plus T20 drive ensures fast insertion without splitting the timber.

In a nutshell

The right choise for

With the Spax plumber screw t-star plus T20 in 4.5 x 35 mm, you can securely mount roof and facade cladding, sheet metal, and profiles onto wooden substructures. The integrated 20 mm sealing washer with epdm backing creates a reliable watertight seal around the drill hole to keep moisture out. Made from durable A2 stainless steel, this screw provides lasting resistance against weather exposure and corrosion. The 4CUT tip reduces driving resistance and prevents timber splitting, while the t-star plus T20 drive ensures precise torque transfer without cam-out. This handy pack of 60 pieces delivers dependable outdoor performance.



€0.34
In stock - tax incl.

Product information

Key features according to our expert

  • Diameter: 4,5 mm
  • Material: Stainless steel A2
  • For material: Wood
  • Length: 35 mm

Product description

  • No splitting of the wood, even at small edge distances
  • High resistance to weathering and corrosion
  • Quick and reliable processing with little effort
  • Application: exterior and roof applications - exposed to weather influences

Nothing can damage a structure as much as water penetration. To prevent this, not only do the building materials used have to be water-resistant, but the connecting materials are also part of a well-thought-out sealing system. The SPAX gusset screw is used where plastic roof panels, metal sheets or connection profiles must be fastened tightly and permanently.

For this purpose, our washer screw is made of stainless steel and comes with an EPDM sealing washer already inserted. The latter prevents water from penetrating into the roofing and construction via the drilled hole. Unlike other products, our sealing ring consists of a single piece with a diameter of 20 mm. This benefits not only the seal itself, but also pressure distribution on the often sensitive plastic or metal surfaces.

Screw and sealing ring are made of A2 stainless steel and can easily withstand exposure to weather conditions. In addition to the larger sealing ring, it is above all our own SPAX features that make our SPAX mortise screw so special: these include the T-STAR plus power gripping and the 4CUT tip, which offer unique processing advantages.

What this means for you: you can reliably fasten roof boards and cladding with a single working step and permanently seal the fastening points.

All Features

Diameter
4,5 mm
Material
Stainless steel A2
For material
Wood
Length
35 mm
Wire length
28 mm
  • Brand SPAX
  • EAN 4003530266836
  • Supplier number SPAX 4577000450357

Frequently asked questions about this product

Answered by specialists
What is this plumber screw used for?
You use it to securely fasten roof panels, sheet metal, and exterior cladding to wooden substructures with a watertight seal.
Which bit size is required for installation?
You need a T20 bit with the T-STAR plus recess for optimal grip and efficient torque transfer.
What are the specifications of the sealing washer?
It is a 20 mm diameter washer made of A2 stainless steel with an integrated EPDM rubber seal to prevent leaks.
Do you need to pre-drill into wood?
Thanks to the 4CUT point, pre-drilling in softwood is generally not required, which also reduces wood splitting.
Is this screw suitable for outdoor use?
Yes, the A2 stainless steel construction provides dependable corrosion resistance against direct weather exposure.
Questions about this product?

Our product specialists are happy to help with any questions about this range. Call, email or chat with us!

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