Expansion Anchor Bolts

By tightening the nut, the Wanluo factory Expansion Anchor Bolts rod pulls the conical head upward to squeeze and expand the outer sleeve, enabling the expansion sleeve to tightly fit the drilled hole wall through external radial tension. It forms stable friction locking with the substrate, featuring simple installation, ultra-high universality and strong construction adaptability. It covers most light and medium-load fixing scenarios, serving as the most cost-effective conventional anchoring solution for civil engineering, equipment installation and daily building construction.

Structural Features & Manufacturing Technology

The Expansion Anchor Bolts adopts integrated stamping and precision thread rolling technology, consisting of a high-strength threaded bolt, conical expansion head, multi-slit outer expansion sleeve, flat washer and locking hex nut. The multi-slit split sleeve design ensures uniform and full radial expansion without unilateral deformation, realizing large-area contact and friction locking with the hole wall. The precisely matched conical head provides smooth and labor-saving extrusion during tightening, ensuring consistent expansion degree and stable locking force for each anchor bolt. The standard rolled thread features neat tooth shape and high matching precision, effectively avoiding sliding wire and loose locking. Manufactured from high-quality carbon steel and stainless steel materials with standardized surface anti-rust treatment, the product has excellent structural toughness, tensile resistance and anti-aging performance. Strict dimensional tolerance control ensures standard drilling matching and on-site construction stability, adapting to various conventional substrate installation environments.

Product Parameter

Product Design Features

1. Ultra-high universal adaptability, no need for special reaming drills, special undercut processing or glue curing. It only requires conventional drilling and cleaning to complete installation, with low construction threshold and strong on-site fault tolerance.

2. Multi-slit outer sleeve uniform expansion design forms large-area friction contact with the hole wall. The locking force is stable and even, effectively resisting conventional vibration, wind pressure and static load pressure, meeting daily medium and light-load fastening requirements.

3. Cost-effective conventional anchoring solution with simple structure and mature manufacturing process. It greatly reduces engineering procurement and construction cost compared with undercut anchors and self-cutting mechanical anchors, suitable for large-scale batch construction projects.

4. Flexible and diverse specifications with optional galvanized and stainless steel materials. It has excellent anti-rust and anti-corrosion performance, adapting to indoor dry environments and outdoor humid conventional construction scenarios.

5. Wide application coverage, Expansion Anchor Bolts is widely used in air duct fixing, pipeline support, electrical equipment installation, guardrail fixing, civil decoration, small mechanical equipment anchoring and general building engineering fastening projects.

FAQ

Q1: What is the difference between Expansion Anchor Bolts and mechanical undercut anchors?

A1: Expansion anchor bolts rely on sleeve extrusion friction for locking, suitable for conventional light and medium-load scenarios with high cost performance; self-cutting undercut anchors and back cut anchors adopt rigid mechanical interlock with zero expansion stress, higher bearing capacity and safety, specially used for heavy-load and high-standard curtain wall engineering.

Q2: Are expansion anchors suitable for heavy-load equipment fixation?

A2: Ordinary external expansion anchors are recommended for light and medium-load static fastening scenarios. For heavy-load, strong vibration and long-term high-risk engineering fixation, it is recommended to choose wedge anchors or self-cutting undercut mechanical anchors for higher safety.

Q3: Can expansion anchor bolts be reused?

A3: After full expansion and locking, the sleeve is permanently deformed and cannot be restored. It is a one-time fastening product and not recommended for secondary reuse to avoid insufficient locking force.

Q4: Why do expansion anchors loose after long-term use?

A4: Long-term strong vibration, substrate aging and excessive load will cause friction attenuation. It is recommended to use in conventional static environments; for vibration scenarios, upgrade to mechanical interlock anchor bolts.

Q5: Can customized special sizes be provided?

A5: Yes. We support customizing ultra-long, thickened, reinforced expansion sleeves and special anti-corrosion surface treatments to meet personalized construction and special environment fastening needs.