Wall-Through Screw

Wall-Through Screw:Overview

A wall-through screw(also called a through-wall screw or long-threaded anchor)is a type of fastener designed to penetrate entirely through a wall or panel to secure objects on both sides.Unlike standard screws that engage only one side of a material,it typically uses a nut and washer on the opposite side to create a clamped connection.This design provides high pull-out resistance and uniform load distribution,making it ideal for heavy-duty mounting in construction,HVAC,and electrical installations.

Key Features&Design

Material:

Made from carbon steel(Grade 4.8/8.8),stainless steel(A2/A4 for corrosion resistance),or hot-dip galvanized steel.

Lengths range from 50mm to 500+mm to accommodate varying wall thicknesses.

Thread Design:

Fully threaded or partially threaded shafts for adjustable grip.

Self-tapping tips available for easier penetration into masonry or metal.

Components:

Includes washers and nuts to distribute pressure and prevent crushing of brittle materials(e.g.,drywall,insulation panels).

Optional sealing gaskets for waterproofing in exterior applications.

Applications

Structural Mounting:Securing brackets,frames,or shelves to masonry/concrete walls.

MEP Systems:Installing pipes,conduits,or ventilation ducts through walls.

Facade Cladding:Attaching panels or sunshades to building exteriors.

Temporary Structures:Fastening temporary signage,fences,or stage equipment.

Installation Process

Drilling:A hole is drilled through the entire wall using a hammer drill or core bit.

Insertion:The screw is passed through the object and wall.

Fastening:A nut and washer are tightened on the opposite side to the required torque.

Sealing:For outdoor use,silicone or butyl tape is applied to prevent water ingress.

Advantages

Bidirectional Load Distribution:Resists pull-out forces from both sides.

Adaptability:Works with solid walls(concrete,brick)and hollow materials(drywall with toggle anchors).

Cost-Effectiveness:simpler alternative to chemical anchors for medium-duty applications.

Reusability:Can often be removed and reinstalled if needed.

Limitations

Wall Damage:Penetration may compromise insulation or waterproofing if not sealed properly.

Corrosion Risk:Carbon steel versions require coatings for humid environments.

Installation Access:Requires access to both sides of the wall for nut tightening.

Technical Standards

Complies with ISO 898-1(mechanical properties of fasteners)and ASTM A307(carbon steel bolts).

Load ratings depend on substrate material and screw diameter(e.g.,M10 screw in concrete:~15 kN shear strength).

Safety Notes

Pre-Drill Accuracy:Hole diameter must match screw size to avoid loosening.

Torque Control:Over-tightening may strip threads or damage walls;under-tightening reduces grip.

Substrate Assessment:Avoid use in cracked concrete or weak masonry without reinforcement.

Conclusion

The wall-through screw is a versatile,robust fastening solution for applications requiring deep penetration and balanced load transfer.Its simplicity,strength,and adaptability make it a go-to choice for contractors in construction and utilities.Proper installation and environmental considerations are key to ensuring long-term reliability.