KNIPEX Cobra Pliers Set Review: A Must-Have for Electricians
REVIEWS
Some tools remain in the bottom of a toolbox until one very specific job appears.
KNIPEX Cobra pliers are not one of those tools.
The KNIPEX 00 31 20 V01 US Cobra Pliers Set includes two adjustable water-pump pliers in practical 7¼-inch and 10-inch sizes. They can grip nuts, pipes, cable glands, fittings and irregularly shaped components that ordinary combination pliers struggle to hold.
I recommend this set, and I consider it a must-have in every electrician’s and automation technician’s tool bag.
Affiliate disclosure: This article contains affiliate links. I may earn a commission when you purchase through one of these links, at no additional cost to you. As an Amazon Associate, I earn from qualifying purchases.
The smaller model has 18 adjustment positions and a maximum working capacity of approximately 1½ inches. The larger pliers offer 25 adjustment positions and can grip workpieces up to approximately two inches. Both are manufactured from forged, oil-hardened chrome-vanadium electric steel.
The combination works well because the two tools perform slightly different roles.
The 7¼-inch pair is compact enough for control cabinets, machines and crowded service spaces. The 10-inch pair provides more leverage and a wider jaw capacity for larger glands, conduit fittings and stubborn fasteners.
Push-Button Adjustment
Traditional adjustable pliers often require you to open the handles, move the joint and test the opening several times before finding the correct position.
The Cobra design uses a push-button adjustment.
Place the upper jaw against the workpiece, press the button and slide the lower jaw into position. Once released, the joint locks into the selected adjustment point.
This makes the pliers quick to resize when moving between:
Cable glands
Nuts
Pipes
Pneumatic fittings
Conduit accessories
Machine components
The joint is designed to resist accidental movement once adjusted. KNIPEX also uses a box-joint construction, meaning the moving handle is guided from both sides for better stability.
Strong Self-Locking Grip
One of the main reasons I recommend Cobra pliers is their self-locking action.
When correctly adjusted on a pipe or nut, the jaw geometry helps the tool bite into the workpiece rather than continually sliding away from it. This means less squeezing force is required from your hand.
The gripping surfaces have hardened serrated teeth rated by KNIPEX at approximately 61 HRC. The pliers can grip round, hexagonal, square and flat objects.
For electricians and automation technicians, that makes them useful for:
Tightening and loosening cable glands
Holding conduit fittings
Removing damaged nuts
Working on pneumatic valves
Gripping hose and pipe fittings
Holding sensor mounting hardware
Removing stubborn enclosure accessories
Temporary gripping during maintenance
They are often the tool you reach for when the correct spanner is missing—or when the fastener is no longer in a condition to cooperate with one.
Why Both Sizes Are Useful
The smaller 7¼-inch Cobra is likely to see the most use in automation and control work.
It fits more easily inside machines and provides better control around small fittings. At roughly 0.395 pounds, it is also light enough to carry every day without adding much weight to a service bag.
The 10-inch version is better when you need:
Greater leverage
Wider jaw opening
More grip on large fittings
Additional handle length for stubborn parts
It weighs approximately 0.745 pounds and can handle round workpieces up to around two inches.
Owning both prevents you from forcing the small pliers onto oversized work or carrying the larger pair for every tiny cabinet job.
Important Electrical Safety Warning
These particular Cobra pliers have red non-slip plastic-coated handles, but they are not electrically insulated.
KNIPEX specifically identifies both included models as non-insulated and warns not to use this set on live circuits. Power must be switched off before using them around electrical equipment.
Red handles do not automatically mean VDE protection.
Before working inside a panel:
Isolate the electrical supply.
Apply the required lockout procedure.
Verify that voltage is absent.
Check for auxiliary and secondary supplies.
KNIPEX produces separately rated insulated pliers for live-work applications, but this exact Amazon set is not one of them.
Are There Any Disadvantages?
The serrated jaws provide excellent grip, but they can mark softer or decorative surfaces.
Be careful when using them on:
Chrome fittings
Brass components
Painted surfaces
Soft aluminium
Finished stainless steel
Precision fasteners
For undamaged nuts that must be tightened accurately, use the correct spanner, socket or torque wrench.
The Cobras are gripping tools, not calibrated tightening instruments.
They also do not replace cutters, combination pliers or long-nose pliers. Their purpose is gripping and turning larger objects.
Final Verdict
The KNIPEX Cobra 00 31 20 V01 US set is one of the most practical hand-tool combinations an electrician or automation technician can carry.
The smaller pliers are excellent for tight machine spaces and control-cabinet work. The larger pair provides the leverage and capacity needed for glands, fittings and heavier maintenance tasks.
Their quick push-button adjustment, strong self-locking grip and durable box-joint design make them far more useful than ordinary adjustable pliers.
I recommend this set, and I consider it a must-have in every electrician’s and automation technician’s tool bag.
You may not use them for every job—but when something is round, damaged, awkward or refusing to move, you will be very glad they are there.
