Product Description
Anyone who has ever tried putting a nut back onto the end of a bolt that's been introduced to a hammer will understand immediately why this tool exists.
The thread may be perfectly serviceable for almost its entire length.
Unfortunately, the first couple of threads have been flattened, mushroomed or distorted just enough to prevent the nut from starting.
The Laser 8658 approaches the problem from the outside.
Its three tungsten carbide cutting blades progressively remove the damaged material and create a clean chamfer around the end of the bolt, stud or threaded rod.
Instead of trying to recreate every individual thread form, the tool restores the lead into the existing thread, allowing the nut to engage with the undamaged threads behind it.
And that can turn an awkward replacement job into a repair lasting a matter of moments.
Features & Benefits
• External deburring and chamfering tool covering 6mm to 33mm diameters.
• Ideal for repairing damaged bolts, studs and threaded rod.
• Particularly useful for hammer damaged, squashed or flattened thread ends.
• Suitable for use on wheel studs.
• Three tungsten carbide cutting blades provide a smooth controlled cutting action.
• Suitable for stainless steel and hardened steel.
• Also effective on mild steel, copper and brass.
• Can be used on hardwood, fibreglass and hard plastic.
• Useful for deburring the external edges of freshly cut metal bar and pipe.
• Includes a 65mm 3/8"D quick chuck adaptor.
• Quick chuck adaptor allows convenient use with a suitable cordless drill.
• Replaceable cutting blades extend the useful service life of the tool.
• Replacement blades available separately as Laser Part No. 8659.
• Wide diameter range allows one tool to cover numerous workshop applications.
Workshop Notes
The Damage Is Often Right at the Beginning
A damaged thread doesn't necessarily mean the entire thread is damaged.
Quite often the problem is concentrated at the very end.
A bolt may have been struck during removal.
A wheel stud may have suffered damaged first threads.
Threaded rod may have been cut to length and left with a rough edge.
Or the end of a shaft may simply have become slightly mushroomed through years of workshop attention.
The result is frustratingly similar.
The nut can't get started.
Once beyond that damaged area, the remaining thread may be completely serviceable.
The 8658 removes the obstruction and produces a chamfer that helps the nut find its way back onto the original thread.
💡 Tool Academy Special
One Sentence Springs to Mind...
It's remarkable how a perfectly good thread can become completely useless because somebody gave the first three millimetres of it a particularly enthusiastic tap with a hammer.
How Does It Work?
The Laser 8658 contains three tungsten carbide cutting blades arranged around the opening of the tool.
The damaged bolt, stud, bar or rod is introduced into the centre and the tool is rotated.
As it turns, the blades progressively remove material from the external edge.
Because the cutting action occurs around the circumference, the tool creates a controlled chamfer rather than attacking one isolated high spot.
On threaded components, this removes mushrooming and damaged material from the thread entrance.
The objective isn't to recut the complete thread.
It's to restore a clean enough entry for the existing thread to do its job again.
Why Three Cutting Blades?
Using three cutting edges helps distribute the cutting action around the workpiece.
Rather than relying on a single blade attacking one side at a time, the three blade arrangement allows material to be removed progressively around the circumference.
This helps produce the smooth external chamfer required for both thread repair and general deburring work.
And because the blades are replaceable, wear doesn't automatically mean replacing the complete tool.
Tungsten Carbide Cutting Blades
The cutting blades are manufactured from tungsten carbide, chosen for its hardness and ability to maintain an effective cutting edge when working on demanding materials.
Laser specifies the 8658 for use on:
• Stainless steel
• Hardened steel
• Mild steel
• Copper
• Brass
• Hardwood
• Fibreglass
• Hard plastic
That material range makes the tool useful well beyond damaged automotive fasteners.
Fabrication shops, maintenance departments, engineering workshops and installers can all encounter freshly cut or damaged external edges requiring a quick clean finish.
Damaged Bolt and Stud Repair
One of the most useful applications is repairing bolts and studs whose ends have become distorted.
Typical causes include:
• Hammering during component removal
• Accidental impact damage
• Corrosion followed by aggressive removal
• Cutting threaded rod to length
• Previous incorrect fitting
• Squashed or flattened thread ends
If the main threaded section remains serviceable, removing the damaged entrance may allow the original component to continue being used.
That's particularly attractive where replacing the stud would involve considerably more dismantling than repairing its end.
Wheel Stud Applications
Laser specifically identifies wheel studs as a suitable application.
This is an excellent example of where the tool can earn its place in the workshop.
A wheel stud may have perfectly usable threads along most of its length while damage at the exposed end prevents the wheel nut from starting correctly.
Where inspection confirms that the remaining stud and thread are otherwise serviceable, carefully removing the damaged outer material and restoring the lead can provide a straightforward repair.
However, the tool should never be used to disguise serious structural damage.
If a wheel stud is cracked, stretched, badly corroded or extensively damaged, replacement remains the appropriate repair.
Deburring repairs an edge. It doesn't restore the strength of a damaged fastener.
Not the Same as a Thread Die
The 8658 and a conventional thread die solve different problems.
A die follows a particular thread form and pitch.
That means you need the correct die for the exact thread being repaired.
The Laser 8658 doesn't attempt to follow the thread helix.
Instead, it works around the external end of the component, removing damaged material and creating a new lead into the existing thread.
Consequently, its 6mm to 33mm capacity can cover a huge variety of thread diameters and pitches without requiring a separate cutting die for each one.
If the thread is extensively damaged farther along its length, appropriate thread restoration equipment or component replacement may still be necessary.
But where the damage is concentrated at the end, the deburring approach can be considerably quicker.
6mm to 33mm Working Range
The 8658 covers external diameters from:
6mm to 33mm
That's a substantial working range for a compact tool.
It allows the same unit to deal with relatively small fasteners through to much larger bolts, studs, threaded rod, pipe and bar.
This broad coverage is one of the advantages of the chamfering principle.
The tool isn't tied to a particular thread pitch or fastener specification.
It simply needs the component diameter to fall within its working range and the material to be suitable for cutting.
Cordless Drill Operation
Laser supplies a 65mm 3/8"D quick chuck adaptor, allowing the 8658 to be driven using a suitable cordless drill.
For repetitive workshop work, this can make deburring considerably quicker than working entirely by hand.
A cordless drill also allows the cutting action to remain smooth and consistent.
The emphasis should be on controlled rotation, not maximum drill speed.
This is a cutting operation.
Giving the tool time to remove material progressively will generally produce a better result than attempting to discover how quickly the cordless drill can make everything rotate.
3/8" Drive
The tool also features a 3/8"D drive, providing a familiar workshop connection and allowing the supplied quick chuck adaptor to convert it for drill use.
That gives the operator flexibility in how the tool is driven according to the component and working environment.
For delicate work or when first establishing the cut, control is more important than speed.
Deburring Cut Pipe and Bar
Threads aren't the only reason to own the 8658.
Cutting metal bar or pipe can leave:
• Sharp external edges
• Burrs
• Raised material
• Rough corners
• An awkward square edge
The external chamfer tool can remove this material and produce a cleaner finished edge.
This can make components safer to handle and easier to insert into mating parts while giving fabricated work a considerably more finished appearance.
It's one of those secondary uses that may result in the tool leaving the automotive toolbox and spending rather more time near the fabrication bench.
Replacement Blades
The three tungsten carbide cutting blades are replaceable.
Laser supplies replacement blades separately under:
Laser Part No. 8659
This is particularly useful for a workshop tool intended to cut demanding materials such as stainless and hardened steel.
The cutting components will inevitably wear eventually.
Being able to renew the blades rather than discard the complete tool makes considerably more sense for equipment intended for repeated professional use.
Important Information
Inspect the workpiece before attempting repair.
The 8658 is intended to remove external damage and produce a chamfer. It cannot restore the structural integrity of a cracked, stretched or seriously damaged fastener.
When repairing threaded components:
• Establish that the remaining thread is serviceable.
• Remove only enough material to eliminate the damaged area.
• Keep the tool correctly aligned with the workpiece.
• Use controlled rotational speed.
• Avoid excessive pressure.
• Check thread engagement carefully after repair.
• Replace safety critical fasteners where damage extends beyond an appropriate repair.
Wear suitable eye protection when cutting or deburring material.
Why Choose Laser Tools?
Laser Tools has earned a reputation for designing innovative workshop equipment that solves real world servicing challenges faced by professional technicians. Working closely with the automotive industry, Laser continues to develop specialist tools for modern vehicle systems and everyday workshop problems alike.
The 8658 tackles one of the latter particularly well.
Damaged bolt ends have existed for about as long as workshops have contained bolts and hammers.
Instead of requiring a drawer full of different thread dies simply to repair the damaged entrance, Laser has approached the problem from another direction.
Remove the obstruction, restore the lead and let the good thread behind it carry on doing its job.
Specification
Brand: Laser Tools
Part Number: 8658
Product Type: External Deburr and Chamfer Tool
Working Range: 6mm to 33mm
Number of Cutting Blades: 3
Blade Material: Tungsten Carbide
Drive: 3/8"D
Quick Chuck Adaptor: 1/4" Quick Chuck Shank to 3/8"D
Quick Chuck Adaptor Length: 65mm
Cordless Drill Compatible: Yes
Suitable Materials: Stainless Steel, Hardened Steel, Mild Steel, Copper, Brass, Hardwood, Fibreglass and Hard Plastic
Typical Applications: Damaged Bolts, Wheel Studs, Threaded Rod, Metal Bar and Pipe
Replacement Blades: Laser Part No. 8659
Packaged Width: 88mm
Packaged Height: 47mm
Packaged Depth: 138mm
Chief Editor's Observation
There is something deeply satisfying about this tool because it addresses a workshop problem that is frequently far smaller than the repair it threatens to create.
You've got a perfectly serviceable stud.
You've got a perfectly serviceable nut.
And between the two of them are a couple of flattened threads preventing either from acknowledging the other's existence.
The traditional solutions can involve files, dies and varying quantities of patience.
The 8658 simply removes the damaged outer material and gives the nut another opportunity to find the good thread.
Which proves that sometimes the difference between replacing a component and repairing it is nothing more complicated than giving the nut a decent place to start.
