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Vice grips, also called locking pliers, are designed to bite hard and stay locked. That bite is exactly what can leave tooth marks, dents, scratches, or distorted edges. The safest method is therefore not to make every surface “damage-proof,” but to decide first whether locking pliers are suitable, select the least aggressive jaw design, use only enough clamping force, and test the setup before committing the finished part.
If the item is a reusable nut, bolt, tube fitting, finished panel, soft metal, polished surface, or otherwise cosmetic part, use a correctly sized wrench, socket, purpose-built clamp, or another tool that contacts it more gently whenever possible. An educational tool-use guide warns that the teeth in locking-plier jaws tend to damage the object being clamped and specifically cautions against using them on reusable nuts, bolts, tube fittings, and similar parts.
Why vice grips damage workpieces
Locking pliers hold by concentrating force at relatively small contact points. Their serrated teeth are useful when a smooth jaw would slip, but those teeth can emboss a pattern into soft material, scrape a coating, crush a thin wall, or leave a permanent mark on a finished surface. Locking the handles can also make it easy to apply more force than the task requires.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe adjustment screw controls how tightly the jaws close. IRWIN describes the action this way: “Tightens to draw material closer together for tighter grip. Loosens to provide controlled release.” That adjustment is a control, not a damage guarantee. There is no universal screw position, protective material, or clamping pressure that is safe for every metal, plastic, coating, wood species, or composite.
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Damage risk rises when the workpiece is soft, thin, hollow, painted, plated, polished, freshly machined, or visible after assembly. It also rises when the tool must be turned to apply torque, because the jaws can slide, pivot, or dig in as the part resists rotation.
Decide whether locking pliers are appropriate
Use another tool for reusable fasteners and fittings
Do not use vice grips as the default substitute for a correctly sized wrench or socket on a reusable nut or bolt. A wrench distributes contact over the fastener’s flats and is intended to apply torque without serrated teeth. The same caution applies to tube fittings: tooth marks can compromise a sealing surface or make later service difficult.
- Choose a wrench or socket for hex fasteners that must remain reusable.
- Choose a line wrench or the specified fitting tool for tubing connections.
- Choose a non-marring clamp for holding a finished part during assembly.
- Use locking pliers only when their ability to stay locked solves a real problem, such as holding an irregular part while both hands are needed elsewhere.
Ask what the jaws must accomplish
There is a meaningful difference between gripping a shape so it can be turned and clamping two surfaces so they stay together. Gripping usually benefits from a jaw that conforms to varied profiles. Clamping a finished surface benefits from broad, swiveling contact pads that spread the load.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteIf the only reason for choosing vice grips is convenience, stop and compare the possible mark against the time saved. If the part is scrap, hidden, or scheduled for machining later, a tooth-marking tool may be acceptable. If the surface is the final appearance or a sealing interface, treat any mark as a failed result and change tools.
Match the jaw design to the shape and task
| Task | More suitable configuration | Why it helps | Remaining risk |
|---|---|---|---|
| Grip and turn a varied profile | Curved-jaw locking pliers | IRWIN describes curved jaws for gripping and torqueing round pipes, square or hex bolts, and other shapes. | Serrated teeth can still mark the part, especially under high torque. |
| Hold surfaces together during fitting or fabrication | Locking pliers with swivel pads | CHANNELLOCK says its swivel-pad jaw design secures tough clamps while evenly dispersing force and reducing material damage. | Evenly distributed force reduces risk but does not make every material or finish safe. |
| Turn a reusable hex fastener | Correctly sized wrench or socket | Designed to contact the fastener’s flats without locking teeth. | A wrong size, worn tool, or angled load can still round the fastener. |
| Protect a finished or soft surface while holding it | Purpose-built non-marring clamp or fixture | Contact surfaces are intended for controlled holding rather than tooth engagement. | Capacity, reach, and holding strength may be lower than those of locking pliers. |
The two locking-plier options are not interchangeable. Curved jaws address shape and torque; swivel pads address pressure distribution. The IRWIN and CHANNELLOCK product descriptions do not establish a universal ranking, maximum safe force, or guarantee across materials.
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Inspect and prepare before clamping
Check the workpiece
- Identify the exact area that can be contacted. Marked surfaces, sealing lands, threads, machined edges, and painted faces need more protection than hidden scrap.
- Check whether the part is hollow, thin-walled, brittle, or already bent. A clamp that does not leave a visible tooth mark can still deform a thin wall.
- Remove chips, grit, oil beads, and loose coating from the contact area. Debris can become an abrasive third body between a jaw and the part.
- Decide whether the contact point can be moved to a sacrificial tab, an unexposed edge, or a section that will be cut away later.
Check the pliers
- Make sure the jaws open and close smoothly and that the locking action releases when the release lever is used.
- Look for broken teeth, burrs, contamination, or a pad that is loose or tilted. A damaged jaw can concentrate force in one sharp point.
- Confirm that the tool has enough throat depth and jaw opening for the part. Do not force the handles around an object that barely fits.
- Keep your fingers clear of the closing jaws and the release mechanism while positioning the tool.
Use a barrier only as a cautious experiment
A layer of cloth, rubber, leather, plastic, or a soft jaw cover is often suggested to reduce marking. Such a layer can help in a particular setup, but neither IRWIN nor CHANNELLOCK identifies one universally approved barrier or thickness. A barrier can also reduce grip, bunch up, split, transfer dye, or make the clamping force less predictable.
If you choose to try one, treat it as risk reduction rather than proof that the surface is protected:
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- Use the same material on a scrap piece or a concealed area with similar finish and thickness.
- Clamp at the lowest force that holds the test part, then unlock and inspect it under good lighting.
- Repeat the test if the real job involves turning, vibration, heat, moisture, or a different contact angle.
- Discard the barrier if it slips, compresses unevenly, leaves an imprint, or transfers color.
Do not wrap so much material around the jaw that the locking mechanism must be overtightened. A thick cushion can make the tool feel gentle while allowing the part to move, which may create a larger scrape when torque is applied.
Set the adjustment screw conservatively
The adjustment screw establishes the jaw opening and the amount of squeeze available when the handles lock. Start with the screw backed off enough for the jaws to fit over the workpiece. Place the tool on the part, then make small changes until the handles close with firm, controlled resistance.
- Open the jaws and position the workpiece between the intended contact areas.
- Turn the adjustment screw in small increments to reduce the gap. Large turns make it harder to judge how much the fit has changed.
- Close the handles without forcing them. The jaws should contact the part evenly rather than touch at one corner first.
- If the part moves by hand, tighten the screw slightly and test again. Stop as soon as the tool holds the part for the intended operation.
- If the handles require excessive force to close, or the part visibly dimples, back the screw off. More squeeze is not automatically more secure.
This “minimum secure force” approach is a practical inference from the adjustable screw and the documented risk of tooth damage; it is not a universal manufacturer setting. The correct adjustment depends on jaw geometry, surface friction, material stiffness, and whether you are holding or turning the part.
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Position the tool to reduce marking and movement
Keep the jaws square to the work
Align both jaws so their faces meet the workpiece broadly and evenly. A skewed tool can make one tooth or one edge carry most of the load. On a flat part, keep the handles and jaw faces as parallel to the surface as the geometry allows. On a round part, center the part in the curved jaws instead of trapping it against one side.
Choose a stable contact location
Place the jaws close enough to the area being held that the workpiece does not flex like a lever, but far enough from a delicate edge that the edge is not crushed. Avoid clamping across unsupported hollow sections. If the task involves turning, position the tool so the intended rotation tends to seat the jaws rather than peel them off the part.
Plan the force path
Before applying torque, identify where the reaction force will go. Support the workpiece with a vise, fixture, or second hand where safe, and keep the locking pliers from becoming the only support for a heavy or awkward object. If the tool slips, stop and reassess instead of increasing the screw tension automatically.
Lock, test, and monitor the setup
- With the jaws positioned, close the handles until the lock engages. Keep your hand out of the pinch area.
- Apply a light hand pull in the direction of the intended operation. The tool should remain seated without the workpiece shifting.
- Release the tool and inspect the contact area if the surface is especially sensitive or the test force caused any movement.
- For a turning task, begin with a small amount of torque. Watch for jaw creep, surface whitening, coating flakes, or a new indentation.
- Stop immediately if the workpiece starts to rotate inside the jaws. Reposition, improve support, change the jaw design, or choose another tool.
Do not use a longer pipe or another extension on the locking-plier handles to increase leverage. Extra torque can exceed the strength of the part and drive the teeth deeper before you notice the mark.
Release without adding a second set of marks
When the operation is complete, support the workpiece before unlocking the pliers. Hold the tool by its handles, keep fingers clear of the release lever’s pinch points, and operate the release deliberately. Do not twist the locked pliers sideways to break them free; sideways motion can drag teeth across the finish.
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After removal, inspect the contact area immediately. Early inspection tells you whether the adjustment, barrier, and jaw choice were suitable before you repeat the setup on another part.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to do when marks appear
Shallow tooth impressions
Stop using the same setting on finished parts. Record the jaw location and whether a barrier was present, then test a broader pad or a different clamp on scrap. If the mark is cosmetic but the part is otherwise usable, follow the material-specific repair method appropriate to that finish; do not assume a general polishing or sanding step will preserve dimensions.
Crushed edge or distorted tubing
Release the tool and inspect for loss of roundness, a flattened wall, or a damaged sealing surface. Do not reuse a fitting or tube simply because it still appears to hold. Replace the tool with the specified fitting wrench, a support fixture, or a clamp that spreads load over a larger area.
Scratched coating or transferred material
Check the jaw teeth and any protective layer for debris. A contaminated barrier can scratch a surface even when the metal jaws never touch it. Clean or replace the barrier, then perform a new concealed-area test. If the coating is part of corrosion protection, treat the damage as functional, not merely cosmetic.
Tool slips before the work is complete
Do not solve slipping by blindly tightening the screw. Verify that the jaws match the shape, that the contact area is clean, and that the workpiece is supported. A curved jaw may be suitable for a varied profile, while a swivel-pad design may be more appropriate for clamping surfaces. If neither holds securely without excessive force, change tools.
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Examples by common job type
Holding a rough steel tab for cutting
If the tab is scrap or will be trimmed, curved-jaw locking pliers may be reasonable. Clamp on a section outside the cut line, use only enough force to prevent movement, and keep the cutting path away from the jaws. Inspect the tab after release to confirm that deformation has not changed the cut location.
Turning a painted square or hex part
First ask whether a wrench or socket fits. If it does, that is the less damaging choice for a reusable part. If locking pliers are unavoidable, place the curved jaws on a concealed or sacrificial area, test the fit on a similar painted piece, and begin with minimal torque. A barrier may reduce visible marks but can also permit slip, so test it rather than assuming it works.
Clamping two finished panels during assembly
Use a swivel-pad locking-plier design or another non-marring clamp when the task is to hold surfaces together rather than turn a fastener. Center the pads, check that both panels are supported, and tighten only until the joint stays aligned. CHANNELLOCK’s description says swivel pads distribute force evenly and reduce material damage; it does not promise a mark-free result on every finish.
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Holding a tube or fitting
Avoid toothed locking pliers on reusable tube fittings and sealing surfaces. Use the specified fitting tool or a fixture that supports the tube without crushing it. If the tube is disposable scrap, isolate the clamping point from the section that will be installed and verify that the tube remains round where it matters.
Comparison: gripping force versus surface protection
| Choice | Best use | Surface-contact behavior | When to avoid it |
|---|---|---|---|
| Curved-jaw locking pliers | Temporary grip or torque on varied shapes | Toothed contact gives strong bite but can mark or deform the work. | Reusable fasteners, tube fittings, visible finishes, soft or thin material. |
| Swivel-pad locking pliers | Clamping surfaces that need force spread across the contact area | Pads can distribute force more evenly and may reduce material damage. | Any setup where the pad cannot sit flat, the part can slip, or a mark is unacceptable without testing. |
| Correctly sized wrench or socket | Turning reusable nuts and bolts | Contacts the intended flats rather than biting with locking teeth. | Irregular shapes, seized parts with no suitable access, or jobs requiring a clamp that stays locked. |
| Purpose-built non-marring clamp or fixture | Holding finished components during assembly or fabrication | Designed for controlled pressure and broader contact. | Tasks requiring the aggressive bite or torque capability of locking pliers. |
Neither the IRWIN nor CHANNELLOCK descriptions establishes that one option is safe for every material. Select by the actual shape, operation, finish, and consequence of a mark.
Quick Recap
Limits you should not ignore
- Vice grips cannot be made damage-proof by changing the screw position.
- A cloth, rubber layer, or soft cover is not a universal guarantee and may introduce slip or new contamination.
- Swivel pads reduce concentrated pressure; they do not certify a surface as scratch-proof.
- Teeth that hold aggressively can also remove plating, paint, or protective coating.
- More handle force can increase both holding force and damage; it is not a substitute for the correct jaw or tool.
- If a mark would make the part unacceptable, use a process that does not depend on serrated jaws.
A repeatable low-damage procedure
- Classify the part as scrap, hidden, reusable, cosmetic, sealing, soft, thin, or finished.
- Choose a wrench, socket, non-marring clamp, swivel-pad pliers, or curved-jaw pliers according to the task.
- Inspect the jaws, pads, workpiece, and contact area for damage or debris.
- Move the contact point to a sacrificial or concealed area when possible.
- If using a barrier, test its material and thickness on scrap or a concealed area first.
- Adjust the screw in small increments until the jaws close securely without visible crushing.
- Align the jaws squarely, support the workpiece, and apply only the force needed for the operation.
- Test with light hand force, then begin the actual work gradually while watching for movement or marking.
- Stop and change the setup at the first sign of slip, indentation, coating damage, or distortion.
- Release straight and deliberately, then inspect the contact area before repeating the job.
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