4.0mm x 30mm A4 Stainless Steel Classic Multi-Purpose PZ Screws – Double Countersunk Image

4.0mm x 30mm A4 Stainless Steel Classic Multi-Purpose PZ Screws – Double Countersunk

SKU: 40030CLA4

Brand: Timco

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Marine Grade A4 Stainless Steel: Manufactured from premium A4 stainless steel for excellent corrosion resistance, making these multi-purpose screws ideal for coastal, marine and highly corrosive environments.
Versatile Multi-Purpose Fixing: Suitable for fixing into softwood, pre-drilled hardwood, chipboard, MDF and plastic, providing a durable and reliable fastening solution for construction, joinery and general woodworking applications.
Double Countersunk Head: Features a double countersunk design that helps reduce the risk of screw head shear while allowing a neat, flush finish when countersinking into timber and other suitable materials.
Deep 40° Single Thread: Engineered with a 40° deep single thread for excellent grip and high pull-out resistance, ensuring strong, secure and dependable fixings.
Reduced Torque & Timber Splitting: Screws 25mm and longer feature a single slash to reduce driving torque and minimise the risk of timber splitting when fixing close to edges. Particularly suitable for green oak and other timber with naturally corrosive characteristics.

Description

4.0mm x 30mm A4 Stainless Steel Classic Multi-Purpose PZ Screws – Double Countersunk

Marine-Grade Stainless Steel Screws for Coastal, Exterior & Corrosive Environments

The 4.0mm x 30mm A4 Stainless Steel Classic Multi-Purpose Screws combine the reliable performance of traditional multi-purpose wood screws with the superior corrosion resistance of marine-grade A4 stainless steel. Designed for demanding fixing applications, these screws are particularly suitable for coastal locations, exposed outdoor environments and materials where conventional steel fixings may be vulnerable to corrosion.

Manufactured from A4 stainless steel, these screws provide excellent resistance to rust and corrosion, making them ideal for applications exposed to moisture, salt air and challenging weather conditions. They are especially useful when working with naturally corrosive timbers such as Green Oak, where the use of suitable stainless steel fixings helps prevent corrosion and staining around the screw.

Suitable for fixing into softwoods, pre-drilled hardwoods, chipboard, MDF and plastics, these versatile screws provide a dependable solution for construction, joinery, carpentry, decking and general installation work. Their durable construction makes them suitable for both professional tradespeople and DIY applications requiring long-lasting fixing performance.

Featuring a double countersunk head, the screws are designed to reduce the likelihood of head shear while assisting with a neat, flush finish when countersinking into the material. The PZ Pozi drive provides secure engagement with a compatible screwdriver bit, helping maintain control during installation.

The 40° deep single thread provides excellent grip and high pull-out resistance, helping create a strong and reliable fixing. A single slash in the screw thread helps reduce insertion torque and minimise the risk of timber splitting, particularly when fixing close to the edge of the material.

Key Features

Marine-grade A4 stainless steel construction provides excellent corrosion resistance for coastal and exterior applications
4.0mm diameter x 30mm length with a double countersunk PZ Pozi head for a neat, secure fixing
40° deep single thread provides strong grip and high pull-out resistance
Single slash design helps reduce insertion torque and minimise timber splitting during installation

The A4 stainless steel construction makes these screws particularly suitable for coastal properties, outdoor timber structures, garden projects, decking installations and joinery applications where long-term resistance to corrosion is essential.

They are also an excellent choice for fixing materials such as Green Oak and other timbers containing naturally occurring corrosive substances, helping maintain the integrity and appearance of the finished installation.

Combining marine-grade corrosion resistance, dependable fixing strength and a practical double countersunk design, the 4.0mm x 30mm A4 Stainless Steel Classic Multi-Purpose PZ Screws provide a durable, professional fixing solution for demanding interior and exterior applications.

Technical Information

Delivery: 1-2 Working Days
Lead Time: In Stock
Weight: 0.26 Kg
Brand Name: Bright Nails
Colour: Silver
Material: A4 Stainless Steel
Head Type: Double Countersunk

Delivery & Returns

Delivery

The despatch timings we publish are estimates and due consideration needs to be made when making purchases with tight deadlines and as such we shall not be liable for any losses, costs, damages, charges, or expenses caused by any delay for delivery of the goods.

Returns Policy For Brissco Online

We appreciate that there may be occasions you may wish to return items. To help you with this process please see our returns policy below.

Returning an item – Damaged

In the event you receive damaged goods we will arrange a replacement item for you. However, it is your responsibility to notify us within 72 hours of receipt that an item has been received damaged (please see risk below).

Returning an item – Risk

On receipt of the delivery you, the customer, are responsible for those goods and any loss or damage to the goods shall be at your own risk.

Returning an item – Incorrect

If you receive incorrect goods it is your responsibility to notify us within 72 hours of receipt at which point we will make the necessary arrangements.

Delivery shortages

Firstly, our carrier delivers parcels/packages. Any shortages of them must be reported to the driver on receipt. Secondly, shortages of contents of the parcel(s)/package(s) against the enclosed Brissco advice note must be made within 72 hours.

PDFs

FAQs

1. What are A4 Stainless Steel Classic Multi-Purpose Screws used for?

These 4.0mm x 30mm A4 Stainless Steel Screws are designed for secure fixing into softwood, pre-drilled hardwood, chipboard, MDF and suitable plastics. Their marine-grade stainless steel construction makes them particularly suitable for outdoor, coastal and highly corrosive environments.

2. What size are these A4 Stainless Steel Screws?

Each screw measures 4.0mm in diameter and 30mm in length. They feature a double countersunk head and a Pozi (PZ) drive for use with a compatible screwdriver bit.

3. What is the difference between A4 and A2 Stainless Steel Screws?

A4 stainless steel offers greater resistance to corrosion than A2 stainless steel, particularly in environments exposed to saltwater, coastal conditions and certain chemicals. This makes A4 screws a preferred choice for marine, coastal and other demanding outdoor applications.

4. Are A4 Stainless Steel Screws suitable for coastal environments?

Yes. These screws are manufactured from marine-grade A4 stainless steel, making them ideal for coastal locations where salt-laden air and moisture can accelerate corrosion in standard steel fixings.

5. Can these screws be used with hardwood and Green Oak?

Yes. These screws are suitable for hardwood when pre-drilled, including applications involving Green Oak. A4 stainless steel is particularly beneficial when fixing timber containing naturally corrosive substances, helping reduce the risk of corrosion associated with unsuitable metal fixings.

6. What is the benefit of the double countersunk head?

The double countersunk head helps reduce the likelihood of head shear during installation and assists with countersinking the screw into the material. This provides a secure fixing with a neat, flush finish when correctly installed.

7. Do these screws have a thread designed for strong holding power?

Yes. The screws feature a 40° deep single thread, designed to provide secure fixing and high pull-out resistance in compatible materials, including timber, chipboard and MDF.

8. Do these screws help prevent timber splitting?

Yes. These 30mm screws incorporate a single slash feature designed to reduce driving torque and lower the likelihood of timber splitting, particularly when fixing close to an edge. Pre-drilling may still be necessary depending on the timber type and fixing position.

9. What screwdriver bit is required for these screws?

These screws feature a Pozi (PZ) drive, requiring a correctly sized Pozidriv screwdriver bit. Using the appropriate bit helps achieve reliable engagement and reduces the risk of damaging the screw head during installation.

10. Why choose A4 Stainless Steel Multi-Purpose Screws instead of standard screws?

A4 Stainless Steel Multi-Purpose Screws combine excellent corrosion resistance, strong holding power and versatile fixing performance. Their marine-grade construction, double countersunk head and deep single thread make them a reliable choice for timber, plastics and general fixing applications where long-term durability is important, particularly in coastal or corrosive environments.

Reviews

Martin

Strong, Corrosion-Resistant Screws and Great Service

We needed some good quality stainless steel screws for fitting exterior timber trims and decided to go with these A4 Classic Multi-Purpose screws. They've been easy to use and provide a secure fixing without leaving bulky screw heads. The Pozi drive works well, and the countersunk design allows the screws to sit neatly into the material. The marine-grade stainless steel was the main reason we chose them, as we wanted something suitable for long-term outdoor use.

Jonathan

Reliable Multi-Purpose Screws for Professional Work

I've been using these A4 stainless steel screws for various exterior joinery jobs and have been impressed with their performance. The 4.0mm diameter and 30mm length make them useful for smaller fixing applications, while the stainless steel construction provides excellent corrosion resistance. The deep single thread grips well, and the double countersunk head helps achieve a tidy finish. They're particularly useful when working with materials that require a more corrosion-resistant fixing than standard steel screws.

Antonio

Great Quality Screws for Oak and Hardwood Projects

We purchased these A4 stainless steel screws for a joinery project involving oak, and they've performed really well. We wanted suitable fixings that would help avoid the corrosion and staining associated with ordinary steel screws. The screws feel well made, and the double countersunk heads give a clean, professional finish. They also provide a strong fixing when used with properly prepared and pre-drilled hardwood.

Deborah

Perfect Fixings for Coastal Properties

I regularly carry out maintenance work on properties near the coast, so using the correct stainless steel fixings is essential. These 4.0mm x 30mm A4 screws are a great choice for smaller timber and joinery applications where corrosion resistance is important. The screws drive in smoothly with a suitable PZ bit, and the double countersunk head provides a neat finish. The deep thread gives a good grip, making them a dependable fixing for exposed environments.

Craig

Excellent Stainless Steel Screws for Outdoor Use

Bought these A4 stainless steel screws for a garden project and they've been excellent. The quality is noticeably better than the standard screws I've used previously, and the marine-grade stainless steel gives me confidence they'll withstand the British weather. The Pozi drive provides a good grip when driving the screws in, and the double countersunk heads sit neatly against the timber. They're easy to work with and provide a strong, secure fixing.