Anyone that uses a shear wrench to install tension control (TC) bolts knows that these tools are designed for installation and do not have a reverse function. When an installed TC bolt needs to be removed, a nut buster provides a simple solution.
But how does a nut buster work, and when is it used in structural steel? In this guide, we’ll explain how a nut buster works with a shear wrench, when it’s needed, and how to use it safely for TC bolt removal.
Key Takeaways
- Nut busters provide a way to remove newly installed TC bolts using a shear wrench.
- They are commonly used after PIV or RoCap testing, as well as for rework or connection modifications.
- Nut busters should be matched to the compatible shear wrench and bolt diameter for proper operation.
- When using a nut buster with a Skidmore-Wilhelm or Calibore, the setup must provide a suitable reaction member for the tool to react against.
- Cleaning and proper storage help keep nut busters ready for reliable use on future jobs.
What is a Nut Buster?
Contrary to its name, a nut buster—also known as a reverse sleeve or reverse socket—is an attachment used with a shear wrench to loosen and remove installed TC bolt. Its splined end engages with the shear wrench’s socket, allowing the wrench to rotate the nut buster and loosen the nut from the application.
Nut busters are available for 3/4″, 7/8″, 1″, and 1-1/8″ bolt diameters and are primarily used to remove newly installed TC bolts, such as bolts tested using a bolt tension measuring device, or during rework or connection modifications. They are not intended as a solution for removing old, rusted, or seized fasteners.
Using the appropriate removal setup can help reduce physical effort and unnecessary wear on the tool and hardware.
When Do You Need a Nut Buster?
A nut buster comes in handy when removing TC bolts using the same shear wrench for the installation. While smaller bolt diameters can be removed manually, larger bolts can require significant force.
Nut busters are commonly used following:
- Pre-Installation Verification (PIV): Remove test bolts after completing tension verification.
- Rotational Capacity (RoCap) testing: Remove bolts after testing is complete.
- Rework: Remove installed TC bolts when a connection needs to be adjusted or repaired.
Equipped with a reaction bar, the nut buster provides a point of resistance during operation. This allows the tool to absorb reaction torque rather than the operator.
Planning to remove TC bolts after PIV or RoCap testing?
Make sure your Skidmore or Calibore setup includes a reaction member and the appropriate spacer bushings for your bolt diameter and length.
Using a Nut Buster: Step-by-Step
Step 1: Prepare the Wrench and Nut Buster
Select a nut buster that is compatible with both the shear wrench and the TC bolt being removed. Insert the nut buster into the wrench socket. No additional securing is necessary when properly installed.
Step 2: Position the Wrench on the Bolt
Align the nut buster with the installed TC bolt, placing it over the nut and ensure it is fully engaged before activating the wrench. Hold the wrench securely and make sure the reaction member has a stable point of contact.
Step 3: Activate the Wrench
With the wrench properly positioned, press the trigger to rotate the nut buster and loosen the nut. Maintain a secure grip on the tool and keep hands clear of the reaction member and other pinch points during operation.
Step 4: Remove the Nut
Continue operating the wrench until the nut is sufficiently loosened for removal. If the nut does not loosen as expected, do not force the tool. Excessive force can damage the wrench, nut buster, fastener, or surrounding equipment.
Step 5: Inspect and Store Tools
After removing the nut, inspect the bolt, nut, and surrounding connection for signs of damage before proceeding with reinstallation or replacement.
Step 6: Clean and Store the Tools
Clean the nut buster and shear wrench after use and store them properly to help prevent unnecessary wear and corrosion. Ensure the nut buster and shear wrench are clean and free of debris and store them properly for future use (see last section).
Safety Considerations
As with any structural bolting equipment, proper operation and awareness of potential hazards are essential when using a nut buster with a shear wrench.
- Wear appropriate PPE: Use safety glasses, gloves, protective footwear, and any additional PPE required by the jobsite.
- Stay clear of the reaction member: The reaction member can create a serious pinch point while the tool is operating. Keep hands and other body parts away from it.
- Maintain control of the tool: Make sure the wrench is properly aligned and securely positioned before activating it.
- Keep the work area clear: Make sure surrounding equipment, hardware, and personnel are clear of the tool’s operating area.
- Don’t force a stuck fastener: If the nut will not loosen, stop and determine why before applying additional force or changing equipment.
- Know when to call an expert: If specialized equipment or additional torque is required, contact an expert for guidance on the appropriate removal solution.
Proper preparation and tool positioning can help make TC bolt removal more controlled while reducing unnecessary strain on both the operator and equipment.
Maintenance Tips for Nut Busters
Nut busters are designed for durability and require relatively little maintenance beyond basic cleaning and proper storage. A few simple practices can help keep them ready for future use:
- Clean after use: Remove dirt, debris, and grease with an appropriate cleaner.
- Store in a dry location: Protect the nut buster from moisture and conditions that could cause corrosion.
- Use a protective case or toolbox: Keep the tool protected when transporting or storing it.
- Avoid unnecessary impact or stacking: Prevent damage by storing the nut buster separately from heavy equipment.
Regular cleaning and proper storage can help extend the useful life of the attachment and keep it ready when TC bolt removal is needed.
Get the Right Equipment
Whether you’re removing bolts after testing or handling rework on a structural steel connection, having the right equipment can make the job simpler and more controlled.
Investing in high-quality tools ensures the job gets done right the first time. GWY offers rentals, services, and technical support to help crews find the right bolting solutions. Contact GWY today for industry-leading bolting tools, expert advice, and top-tier customer support to help you tackle any challenge.
FAQs
Can a shear wrench be used to remove a TC bolt without a nut buster?
No. A shear wrench is designed for TC bolt installation and does not have a reverse function, so a compatible nut buster is used to enable removal.
How do I know which nut buster I need?
Select a nut buster that matches the diameter of the TC bolt being removed and is compatible with the shear wrench being used.
What size nut busters are available?
Nut busters are available for 3/4″, 7/8″, 1″, and 1-1/8″ bolt diameters.
Why is the reaction member important during removal?
The reaction member provides a point of resistance that allows the tool to absorb reaction forces during operation rather than transferring to the operator.
What should I do if the nut will not come off with a nut buster?
Rather than forcing the tool, consult a qualified expert to determine whether additional equipment or a different removal method is required.
Can a nut buster remove rusted or seized TC bolts?
Nut busters are intended primarily for removing newly installed TC bolts and are not designed as a solution for heavily rusted, seized, or otherwise difficult-to-remove fasteners.
