Rear Expansion Anchor Bolt – Professional Technical Specification & Product Overview

Rear Expansion Anchor Bolts, also known as mechanical expansion anchors, are precision-engineered fasteners used for high-strength fixation in concrete, masonry, brick, and solid base materials. These anchors provide reliable load-bearing performance by expanding against the walls of a drilled hole when tightened, ensuring secure, long-term structural anchorage.

Available Sizes (Standard Metric Specifications)

Rear expansion anchor bolts are available in a full range of industry-standard diameters:
M6, M8, M10, M12, M14, M16, M18, M20
(Additional sizes and custom lengths available on request.)

Product Definition & Functionality

A Rear Expansion Anchor Bolt is a mechanical fastening system designed to provide robust and permanent anchoring in concrete substrates. Once installed and tightened, the bolt’s expansion mechanism exerts outward pressure within the drilled hole, creating a strong frictional and mechanical grip.

This makes the anchor ideal for applications requiring high pull-out resistance, shear resistance, and vibration tolerance.

Key Components & Structure

Each rear expansion anchor bolt typically consists of:

1. Anchor Body

• Manufactured from carbon steel, stainless steel 304/316, or zinc-plated steel

• Precision-machined threads for stable torque and high load capacity

• Corrosion-resistant finishes suitable for indoor and outdoor conditions

2. Expansion Mechanism

• Cone, wedge, or tapered plug located at the bottom of the anchor body

• Activates during tightening to create radial expansion for strong anchorage

3. Threaded Bolt or Nut Assembly

• Ensures controlled expansion

• Compatible with metric threaded nuts and washers

4. Expansion Sleeve / Clip

• Expands uniformly against the hole wall

• Provides consistent holding strength and prevents anchor slippage

Types of Rear Expansion Anchor Bolts (Mechanical Anchors)

1. Sleeve Anchors

• Full-body expansion sleeve

• Suitable for medium to heavy loads

• Ideal for brick, block, and concrete

2. Wedge Anchors

• High-strength mechanical anchor for structural loads

• Excellent performance in cracked and uncracked concrete

• Commonly used for steel structures and equipment installation

3. Drop-In Anchors

• Internally threaded anchors set flush with concrete

• Installed using a setting tool

• Best for overhead installation or threaded rod suspension

4. Machine Screw Anchors

• Light- to medium-duty anchors

• Require setting tool expansion

• Used for electrical fixtures, supports, and accessories

Installation Method (Standard Procedure)

1. Drill the hole to the specified diameter and depth.

2. Clean the hole thoroughly by removing dust and debris.

3. Insert the anchor into the drilled hole (tap lightly if needed).

4. Tighten the bolt or nut to activate the expansion mechanism.

5. Ensure the anchor is fully expanded to achieve maximum holding capacity.

Applications & Industry Use Cases

Rear Expansion Anchor Bolts are widely used across construction, industrial, and mechanical engineering sectors, including:

• Fixing steel structures, brackets, and support frames

• Installing handrails, guardrails, and safety equipment

• Anchoring heavy machinery and industrial equipment

• Mounting HVAC units, cable trays, and pipe supports

• Securing shelving, racking systems, and storage structures

• Applications in reinforced concrete, solid brick, and masonry walls

Key Advantages & Performance Benefits

• High tensile and shear strength for demanding load conditions

• Reliable anchorage in solid base materials

• Easy and fast installation with standard tools

• Vibration-resistant when correctly installed

• Corrosion-resistant materials extend service life

• Suitable for indoor, outdoor, and industrial environments

• Available in multiple materials for various environmental conditions