Drop in Anchor Bolt

The Wanluo’s China Drop in Anchor Bolt entire anchor body sinks completely into the drilled hole, achieving a flush and flat surface finish. With built-in full metric internal threads, it allows bolts, studs and threaded rods to be screwed in for fixed connection. Featuring zero protrusion, high concentricity, uniform expansion force and strong tensile strength, it is the ideal hidden anchoring solution for flat installation, finished surface fixing and high-precision engineering assembly.

Structural Features & Manufacturing Technology

The Drop In Anchor integral precision stamping and thread forming technology, composed of a high-precision internal threaded tube, tapered expansion core and multi-slit expansion sleeve. The unique bottom-tapered structure enables synchronous and uniform outward expansion of the sleeve when the threaded rod is screwed in, forming full-surface close friction fit with the hole wall. The precisely rolled internal thread features smooth tooth profile, high matching accuracy and strong load-bearing capacity, avoiding thread slipping and loosening. The overall body is integrally formed with uniform wall thickness and excellent structural toughness, with no deformation or cracking during high-tension expansion. Manufactured from high-quality carbon steel and stainless steel, with standardized galvanized and passivation anti-corrosion treatment, the product delivers stable mechanical performance and long-term weather resistance. Strict dimensional tolerance control ensures precise hole matching and consistent installation effect for engineering batch construction.

Product Parameter

Product Feature And Application

1. Full sunk flush mounting design with no protruding parts after installation, completely solving the problem of exposed bolt heads of ordinary expansion bolts. Drop in Anchor Bolt keeps the construction surface flat and tidy, perfectly suitable for finished decoration and flat equipment installation scenarios.

2. Pure internal expansion structure realizes uniform outward extrusion from the hole bottom, with larger fitting area and more balanced stress than external expansion bolts. It features stronger tensile resistance and higher overall connection stability, not easy to loose under static load and mild vibration.

3. Built-in standard internal thread enables flexible secondary assembly and disassembly of external bolts and studs, with strong construction flexibility. It avoids the one-way fixed limitation of traditional expansion bolts and facilitates later equipment maintenance and component replacement.

4. Compact and integrated structure with high installation tolerance, no special reaming tools required. It only needs standard drilling and tapping installation, with high construction efficiency and low engineering cost, suitable for large-scale batch construction.

5. Diversified material and anti-corrosion treatments adapt to indoor decoration, outdoor engineering, mechanical equipment fixing and pipeline support anchoring, widely used in construction engineering, electromechanical installation and decorative finishing projects.

FAQ

Q1: What is the difference between drop-in anchors and ordinary expansion bolts?

A1: Ordinary expansion bolts adopt external sleeve expansion with exposed bolt heads; drop-in anchors adopt internal bottom expansion with full sunk flush installation and built-in threads. They have flat surface effect, flexible assembly and more stable stress, ideal for finished surface hidden fixing.

Q2: Can drop-in anchors be disassembled and reused?

A2: The Drop In Anchor anchor body forms permanent expansion locking inside the hole and cannot be taken out, belonging to one-time anchoring fasteners. However, the externally matched bolts can be disassembled and replaced repeatedly for flexible secondary installation.

Q3: What installation advantages does internal threaded design bring?

A3: The built-in thread allows free matching of different lengths of studs and bolts, with no limitation of fixed bolt length. It greatly improves the flexibility of on-site construction and adapts to various thickness of fixed accessories.

Q4: Is the bearing capacity of drop-in anchors reliable?

A4: Yes. The bottom internal expansion forms full-wall fitting friction locking with uniform stress distribution, with higher tensile strength than conventional external expansion bolts, fully meeting medium-load engineering anchoring requirements.

Q5: Can customized special specifications be produced?

A5: Yes. We support customizing non-standard thread sizes, deepened anchor bodies, thickened reinforced sleeves and special anti-corrosion surface treatments to meet personalized engineering fixing needs.