Multi-Fix Countersunk Concrete Screws 7.5 x 40mm (100/Box)
Hard-wearing single-thread countersunk screws for masonry with a plug, or timber/sheet materials. Suitable for structural and framing work. 7.5 x 40mm sizing is ideal for conduit clips, battens, and brackets.
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Product Overview
Hard-wearing single-thread countersunk screws for masonry with a plug, or timber/sheet materials. Suitable for structural and framing work. 7.5 x 40mm sizing is ideal for conduit clips, battens, and brackets.
Delivery & Returns Information
How Our Delivery Works
We work with a nationwide network of trusted suppliers. As a result, items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you'll see multiple delivery charges at checkout. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery Areas & Charges
Delivery charges listed on our website apply to mainland UK, excluding the following postcode areas: AB, CF, DD, DG, FK, KW, IV, LA, LD, LL, NP, PA, PH, SA, SY
If your delivery address falls within one of these postcode areas, we’ll be in touch before processing your order to confirm any additional delivery costs.
Please note: We do not currently offer delivery outside the UK mainland.
Standard (Nationwide) Delivery
| Screws & Fixings and Adhesives & Sealants | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £50 | £5 ex. VAT |
| Over £50 ex. VAT | FREE |
| Insulation, Plasterboard and Drylining Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £350 | £35 ex. VAT |
| Over £350 ex. VAT | FREE |
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £10 ex. VAT |
| Over £300 ex. VAT | FREE |
Express Delivery
| Express Delivery - Insulation and Plasterboard & Drylining | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £50 ex. VAT |
| Over £400 ex. VAT | £35 ex. VAT |
| Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £50 ex. VAT |
| Over £300 ex. VAT | £35 ex. VAT |
Returns
We offer a 30 day returns policy on any faulty products.
Key Features
- {{check_circle}} For use in solid concrete, brick, block and masonry
- {{minimize}} Countersunk head creates a smooth, flush finish
- {{fitness_center}} Ensures secure and long-lasting joints
- {{checklist}} Compatible with several substrates
Technical Specification
| Material Type: | Carbon Steel |
|---|---|
| Length: | 40mm |
| Box Quantity: | 100 |
| Sales Unit: | Box |
| Collated: | No |
| Diameter: | 7.5mm |
| Head Type: | Countersunk |
| Indoor/Outdoor Usage: | Indoor |
| Drive Type: | TX |
| Thread Length: | Fully Threaded |
Product Overview
7.5 × 40mm Multi-Fix Countersunk Concrete Screws for direct installation into solid concrete, brick, block, or masonry substrates without the use of a plug.
Manufactured from case-hardened carbon steel with a durable zinc-plated finish, they provide rapid installation, high pull-out resistance, and dependable torque control.
The countersunk head produces a neat, flush finish ideal for visible or surface-mounted fittings, while the serrated single-thread design ensures fast cutting action and secure anchorage even in dense substrates.
7.5 × 40mm sizing is optimised for light-duty applications such as conduit clips, battens, and small brackets in solid walls.
Features & Benefits
- Material composition: Case-hardened carbon steel delivers superior torsional strength and thread retention under load.
- Drive type: Pozi recess ensures precise torque transfer and reduced cam-out under sustained drive.
- Head design: Countersunk form provides a flush, professional finish against timber or metal components.
- Thread form: Serrated single-thread profile enables rapid cutting and high mechanical interlock in masonry.
- Corrosion resistance: Zinc-plated coating to ISO 2081 provides reliable protection in dry interior environments.
- Nominal size: 7.5 × 40mm.
- Box quantity: Supplied in a box of 100 for consistent trade supply and efficient multi-project use.
Applications
- Conduit and cable clips: Secure fastening to blockwork or solid brick surfaces.
- Battens and framing: Ideal for timber battens, rails, and wall plates.
- Brackets and fittings: Provides reliable anchorage for interior metal or timber fixtures.
Installation Guidance
- Pilot holes: Drill 6mm pilot holes using an SDS or masonry bit to a minimum of 10mm beyond embedment depth.
- Drive selection: Use a Pozi No.3 bit for controlled torque application and stable recess engagement.
- Insertion method: Drive at moderate speed without hammer action to maintain thread integrity.
- Finishing: Tighten until the head seats flush; avoid overtightening to prevent substrate cracking.
Compliance & Performance
- Manufacture standard: Produced to EN 14592 for mechanical fasteners and tested in accordance with ETA performance protocols.
- Mechanical strength: Case-hardened for enhanced torsional capacity and consistent pull-out performance in solid materials.
- Surface finish: Zinc electroplated to ISO 2081 for internal corrosion protection.
- Safety guidance: Always wear eye and hearing protection when drilling or fixing.
- Important note: Suitable only for non-cracked, sound masonry and concrete. Not designed for friable substrates or load-bearing structural anchorage.
