Concrete screw | TXE | A4

If you need a concrete screw for installations without a plug in humid or corrosive environments, the A4 TXE Stainless Steel Concrete Screw is an optimal choice. The screw is manufactured from acid-proof A4 / AISI 316 steel and is specifically designed for aggressive environments such as coastal installations, industrial premises, or wet areas. It features a heavy-duty hexagonal head with an integrated flange for even contact and a cutting thread that provides direct fastening into a pre-drilled hole – completely without the need for a plug. The product is sold individually.

FIELD OF APPLICATION

The A4 TXE Concrete Screw is used for anchoring brackets, railings, machinery mounts, and signs in concrete. It is ideal for coastal construction, chemical environments, and other corrosive settings where traditional fasteners rust quickly. The screw provides a strong, vibration-resistant, and permanent anchorage – without expansion. Installed with a socket for the hexagonal head and requires pre-drilling. Suitable for both cracked and non-cracked concrete.

TECHNICAL SPECIFICATIONS

• Product type: Concrete screw
• Standard: Not specified
• Quality: A4 / AISI 316 (acid-proof stainless steel)
• Material class: A4-80
• Thread type: Cutting thread for concrete
• Surface finish: Untreated (natural stainless steel)
• Head shape: Hexagonal with flange
• Drive type: External hex (SW)

FREQUENTLY ASKED QUESTIONS (FAQ)

How does a concrete screw work without a plug, and what is the benefit of a cutting thread?

A concrete screw (also called a concrete bolt) threads itself directly into the pre-drilled hole in the concrete:

• Mechanical anchorage: The screw's hardened thread crests cut a groove into the concrete wall during installation. This creates a rigid, form-fit connection without the need for an expansion anchor or plastic plug.

• Expansion-free fastening: Unlike traditional expansion bolts, concrete screws create no outward tension/expansion force in the concrete. This allows for installation near edges and at shorter center-to-center distances without the risk of cracking.

• Direct installation: You pre-drill directly through the fixture and drive in the screw — which saves significant time during series installation of studs, brackets, and steel structures.

Why is A4 / AISI 316 crucial for concrete screws outdoors and in aggressive environments?

Standard concrete screws made of zinc-plated or hardened carbon steel rust quickly outdoors or in damp drill holes where condensation collects.

• Complete corrosion protection: Acid-proof A4 steel (1.4401 / AISI 316) is alloyed with molybdenum and effectively prevents crevice and pitting corrosion from road salt, marine air, chlorine, and industrial chemicals.

• Coastal & Wet areas: Perfect choice for installations in piers, facades, car washes, treatment plants, indoor swimming pools, and chemical industries.

• Specially hardened thread tip: The screw is manufactured using advanced dual-metal/hardening technology, where the cutting tip of the thread has sufficient hardness to cut into concrete, while the screw body retains the tough corrosion resistance of A4 steel.

What does the "Hexagonal head with flange and TX/TXE" mean for installation?

• Washer-free contact: The integrated flange under the hexagonal head distributes the clamping force over a larger area. This eliminates the need for loose washers and provides a neat, stable installation against both steel and wood.

• Dual drive system (TX / Hex): Can be driven with standard sockets or open-ended wrenches via the hexagonal head, or alternatively with TX bits (Torx) for optimal torque transmission when installing in confined spaces where a socket will not fit.

What should be considered regarding drill diameter and drill depth during installation?

1. Drill diameter: For the TXE concrete screw, the dimension corresponds to the drill diameter d₀ – e.g., an 8 mm drill for size 8. Drill using an SDS-plus concrete drill bit. The recommended drill diameter and depth for each variant can be found in the dimensional drawing among the product images.

2. Cleaning the drill hole: Critical step! Blow out and brush the hole free of drilling dust. If drilling dust remains, the screw may bind prematurely before reaching the correct setting depth.

3. Drill depth: Drill at least to the minimum drill depth h₁ for the respective variant, which is 5–15 mm deeper than the embedment depth h_nom, depending on the size. The space under the screw tip collects the drilling dust generated as the thread cuts into the concrete.