Qingdao Haosail Machinery Co., Ltd.

Introduction

In the rigging industry, tensile testing is one of the most important methods to verify the strength and reliability of lifting components. Traditional straight-line tensile testing evaluates the basic load-bearing capacity of products under axial force. However, during real lifting operations, rigging components are often exposed to more complex loading conditions caused by lifting angles, uneven loading, or misalignment.

To better simulate these practical conditions, angular pull testing (also known as side load testing) is used as an advanced verification method to evaluate the structural performance of rigging products under non-axial loading.

What Is Angular Pull Testing?

Unlike conventional tensile testing, where the load is applied along the centerline of the product, angular pull testing applies force at a controlled angle.

During this process, the product experiences not only tensile force but also additional stresses, including:

· Side loading force

· Bending moment

· Local stress concentration

· Uneven force distribution

This creates a more challenging test condition and provides additional information about the product’s structural performance.

Why Is Angular Pull Testing More Technically Challenging?

1. Advanced Test Fixture and Equipment Requirements

Straight tensile testing requires the product to be aligned with the loading direction. Angular pull testing, however, requires specially designed fixtures to ensure:

· Accurate loading angles

· Stable product positioning

· Uniform force application

· Reliable test data

Improper fixture design may influence test results or create unrealistic failure conditions. Therefore, the testing system itself requires higher engineering consideration.

2. Simulating Real Working Conditions

In actual lifting applications, loads are rarely applied perfectly vertically. Factors such as:

· Multi-leg sling configurations

· Limited lifting space

· Load shifting

· Incorrect alignment during operation

may create angled forces on rigging components.

For example, chain connecting links, shackles, and hooks may experience additional bending stress when subjected to side loading. Angular pull testing helps evaluate whether the product maintains structural integrity under these more complicated situations.

3. Revealing Potential Structural Weaknesses

Some defects may not appear during standard tensile testing but can become visible under angled loading.

Angular pull testing can help identify:

· Uneven material distribution

· Local deformation

· Weak areas caused by manufacturing processes

· Insufficient structural design

For forged rigging components, this type of testing provides valuable data for improving product design and manufacturing control.

Applications in Rigging Products

Angular pull testing is especially valuable for products such as:

· G80 and G100 chain connecting links

· Shackles

· Lifting hooks

· Turnbuckles

· Eye bolts

· Sling connectors

For these products, understanding how the structure reacts to side forces can help manufacturers improve design reliability and provide more comprehensive performance verification.

Enhancing Product Reliability Through Advanced Testing

As lifting applications become more demanding, customers are increasingly looking for suppliers who can provide not only qualified products but also professional testing capabilities.

In addition to standard tensile testing, angular pull testing demonstrates a manufacturer’s focus on:

· Product engineering

· Quality control

· Application safety

· Continuous improvement

By combining different testing methods, manufacturers can gain a deeper understanding of product performance and provide more reliable solutions for various lifting applications.

About Qingdao Haosail

As a professional manufacturer of rigging hardware, Qingdao Haosail focuses on the development and quality control of lifting products, including shackles, chain fittings, hooks, turnbuckles, and related rigging accessories.

Through strict production control and comprehensive testing procedures, Haosail continuously improves product reliability and provides customers with dependable rigging solutions for different applications.