Impact Wrenches For Scaffolding: Best Tools For The Job

Scaffolding is a physically demanding job that can take a toll on workers' bodies over time. In recent years, there has been a shift towards using impact wrenches instead of traditional scaffold spanners for tightening and loosening scaffold fittings. Impact wrenches are electric tools that deliver a high amount of torque with minimal effort from the user. This can speed up the process of installing and dismantling scaffolding and reduce the physical strain on workers.

However, there are some concerns about using impact wrenches for scaffolding. One major concern is the risk of applying too much torque and stripping the threads of the fittings. Impact wrenches also generate noise and vibrations that can cause long-term hearing and joint or muscle issues for workers if proper protective equipment is not used.

Overall, impact wrenches offer increased speed and reduced physical impact on the user but require additional safety considerations and training.

Impact vs scaffold wrench

The debate between using an impact wrench versus a scaffold wrench for scaffolding work has been ongoing, even among scaffolders with extensive industry experience. While some defend the idea of using an impact wrench to tighten bolts on a scaffold, others prefer the traditional scaffold spanners designed for use with scaffolds.

Scaffold Wrench

Also known as a spanner wrench or scaffold spanner, a scaffold wrench is a tool that relies on a long arm and the principle of mechanical advantage. It is specifically designed to work with the fittings found on a scaffold, typically measuring 8-12 inches in length, with 6-point or 12-point sockets. This length is optimal for applying the right amount of torque to get the nut into place without over-tightening. The box socket is usually pivoted on the handle, allowing for easy operation in tight spaces.

Impact Wrench

An impact wrench, on the other hand, is an electric tool that delivers force as the mechanics inside the tool spin. This provides more power, speed, and convenience than a manual scaffold wrench. However, one of the major concerns with using an impact wrench for scaffolding is the risk of applying too much torque and stripping the threads. Additionally, impact wrenches can be noisy and cause vibrations that may lead to long-term health issues such as hearing loss or Hand-Arm Vibration Syndrome.

Recommendations

The National Access and Scaffolding Confederation (NASC) has deemed the use of impact wrenches for scaffolding acceptable, provided that employers first perform tests to ensure the tool can consistently apply the correct torque. They also recommend that employees undergo training and familiarisation with the impact wrench to ensure proper usage and address potential health risks.

To summarise, while impact wrenches offer increased speed and reduced physical impact on the worker, scaffold wrenches provide more control over torque and don't require batteries or produce vibrations and noise. The choice between the two depends on the specific requirements and constraints of the scaffolding project, with some scaffolders even opting to use both for different stages of the job.

Health and safety considerations

Health and Safety Recommendations

The National Access and Scaffolding Confederation (NASC) has outlined several important health and safety recommendations for employers and employees when using impact wrenches for scaffolding:

• Risk Assessment: Employers should conduct a thorough risk assessment to identify potential hazards associated with using impact wrenches. This includes addressing noise and hand-arm vibration exposure, which can lead to long-term health issues such as hearing loss and Hand-Arm Vibration Syndrome (HAVS).
• Training and Familiarization: Employees should undergo training, familiarization, and monitoring to ensure they know how to use the impact wrench correctly and safely. This includes understanding the correct torque settings to prevent over-tightening, which can strip threads.
• Personal Protective Equipment (PPE): Providing appropriate PPE, such as vibration-dampening gloves and earplugs, is crucial to mitigating health risks. Employers should also ensure that employees are comfortable with the PPE and encourage open communication about any issues or improvements.
• Battery Management: Impact wrenches are typically battery-powered, so proper battery management is essential. Employees should be instructed to charge batteries regularly and have backup batteries to ensure uninterrupted work.
• Fitting Replacement: In the event that a nut is stripped, it is recommended to replace the entire ensemble ('T' bolt, nut, and washer) rather than attempting repairs on-site.
• Manufacturer's Instructions: Adhering to the manufacturer's instructions for the impact wrench and batteries is vital for safe and effective use.
• Impact Wrench Type: The NASC recommends using impact wrenches only with drop-forged scaffold fittings and not with 'pressed' type scaffold fittings.

Health Risks of Scaffold Wrenches vs. Impact Wrenches

When comparing the health and safety considerations of scaffold wrenches and impact wrenches, it is important to note the following:

• Scaffold Wrenches: The repetitive movements required when using a scaffold wrench can lead to long-term health issues for workers.
• Impact Wrenches: While impact wrenches reduce the amount of movement needed, they expose workers to vibrations and noise that can cause health problems over time. Proper PPE and training can help mitigate these risks.

In conclusion, when using an impact wrench for scaffolding, it is crucial to prioritize health and safety by following recommendations from organizations like the NASC, providing adequate training and PPE, and ensuring proper tool usage and maintenance.

Pros and cons of impact wrenches

The use of impact wrenches for scaffolding is a topic of debate among scaffolders. While some defend the idea of using an impact wrench to tighten bolts, others prefer traditional scaffold spanners. Here are some pros and cons of using impact wrenches for scaffolding:

Pros:

• More power: Impact wrenches deliver more torque than manual scaffold wrenches, making it easier to get fittings into place quickly.
• Increased speed: Impact wrenches allow workers to tighten fittings faster, improving efficiency and reducing the time required for the job.
• Reduced physical impact: Using an impact wrench requires less physical effort, preventing chronic muscle pain, sore backs, and wrist injuries that can result from using a scaffold wrench over many years.

Cons:

• Too much power (over-torquing): Impact wrenches can deliver excess torque, potentially stripping the fitting or causing other issues.
• Noise and vibrations: Impact wrenches can be noisy and transmit vibrations through the user's arm, leading to hearing issues and "Hand Arm Vibration Syndrome" over time.
• Battery issues: Battery-powered impact wrenches may run out of charge during use, requiring extra batteries to be carried as a backup.

Recommended impact wrenches

When it comes to choosing the best impact wrench for scaffolding, there are several options available on the market. Here are some recommended impact wrenches that are suitable for scaffolding work:

Makita DTW300Z Li-ion LXT Brushless Cordless Impact Wrench

This impact wrench from Makita is a popular choice among users. It offers a balance of power and ease of use. With its brushless motor and 18V lithium-ion battery, it delivers efficient performance. This model does not include batteries or a charger, so they would need to be purchased separately. It has a 4.7-star rating on Amazon and is a best seller in the impact wrenches category.

Ingco Brushless Impact Wrench 500Nm

The Ingco Brushless Impact Wrench is a powerful tool with a nut-busting torque of 500Nm and a maximum torque of 650Nm. It comes with two 4.0Ah batteries and a fast charger, ensuring you can work without interruptions. This impact wrench has a 4.4-star rating on Amazon and is favoured by many users.

Bosch PS41-2A 12V Max 1/4-Inch Hex Impact Driver Kit

The Bosch PS41-2A impact driver kit is a good option if you're looking for a tool that delivers sufficient power without being overwhelming. With a maximum torque of 930 inch-lbs (105 Nm), it provides more than enough force for scaffolding work. The kit includes two batteries, so you can always have one charged and ready to go.

DEWALT 20V MAX XR Impact Driver Kit, Brushless, 3-Speed

If you're looking for a versatile tool, the DEWALT 20V MAX XR impact driver kit is a great choice. It features three speeds, allowing you to use it for various applications beyond just scaffolding. The three-speed settings also help you stay below its maximum torque, preventing over-tightening.

KIMO 1/2-Inch Cordless Impact Wrench

For a quiet and compact option, the KIMO 1/2-inch cordless impact wrench is a good choice. While it may not have the highest torque numbers, it is perfect for smaller spaces and won't disturb your neighbours. It's lightweight and easy to handle, making it a convenient choice for your scaffolding projects.

When choosing an impact wrench for scaffolding, consider factors such as variable speed settings, torque, battery life, size, weight, and ergonomics. Additionally, ensure that you follow proper safety protocols and use appropriate personal protective equipment (PPE) when working with impact wrenches.

Torque and battery considerations

Torque and battery life are two key considerations when choosing an impact wrench for scaffolding.

Torque

Impact wrenches can deliver significantly more torque than a human using a manual scaffold wrench. This additional power can speed up the process of tightening and loosening fittings, but it also comes with risks. Applying too much torque can strip the threads or cause other issues. This is a particular concern for scaffolding, given the number of times scaffolding is assembled and disassembled over its lifetime.

To avoid applying too much torque, it is important to choose an impact wrench with adjustable torque settings. Some impact wrenches deliver far more torque than is required for scaffolding (up to 850 ft-lbs), so being able to adjust the torque is essential to avoid over-tightening. The recommended force required to tighten a fitting for scaffolding is 50 N/mtr (Newton Meters) or 37 ft-lbs.

Battery

Battery life is another important consideration when choosing an impact wrench for scaffolding. Running out of battery power in the middle of a job can be a significant issue, so it is important to have fully charged backup batteries on hand. It is also a good idea to charge batteries every night and keep a second battery charged and on standby.

Additionally, when choosing a battery-powered impact wrench, it is worth considering the weight of the batteries and the ease of swapping them in and out of the tool.

Frequently asked questions