Corona Branch & Stem Bypass Pruner (BP 4180): Product Review

GPR recommendation

Easy to use:



Final thoughts

Cheap scissors that work well

total score


Do you want a lightweight and cost-effective solution to the template needs of your manuals? Corona was kind enough to send me a sample of the Branch & Stem Pruner (BP 4180) for review. Let’s see how it worked.


  • Die head type: Bypass
  • Adjustable blade tension: Yes, use a screw and nut system at the pivot point of the blade
  • Locking equipment: Slide the thumb
  • Spring type: Helix (spiral spring)
  • Reported cutting diameter: 5/8 “
  • Available in right and left hand models: No, only for the right-handed
  • Special features: Lanyard / pendulum loop at the end of the handle
  • It has a bumper: Yes
  • Touch the frame material: Nylon
  • Handle content: Nylon
  • Sheet content: Carbon steel
  • Metal plating or metal plating: No.
  • Interchangeable blade: Yes
  • Is it possible to sharpen knives?: Yes
  • Weight: 7 1/8 ounce.


Watch the video to see the Corona branch and Stem Pruner in action, as well as some of the parts I talk about below in detail. (Note that I took a lot of video reviews that day so I lost my voice!)


Corona 4180 seconds packaging

The cut is packed in a thermoplastic window made of plastic, a sign made of cardboard and a breadboard hole and can be inspected and tested.

The Corona bypass manual had a transparent plastic front and cardboard pad. The support opens easily so I can “test it” (hold it in my hand, squeeze the handles, test the locking device, etc.) before I decide to buy. I really like this packaging. Many Corona toolbars come with some sort of “Try It” or “Touch and Feel” packaging. There is also a pegboard ready with perforation at the top of the package.

The coil spring works well

Many mowers, especially the more expensive ones, have windscreen feathers these days (see photo below). On the other hand, the Corona Branch & Stem Pruner has a helical spring, also known as the “spiral” (see image below between the BP 4180 handles). Both types of springs enlarge the handles with enough force to hold them apart, but not with enough pressure that it takes a lot of hand force to squeeze them together.

The spring on the 4180 is in perfect tension and I like how it attaches to the bumper and nylon posts so it is unlikely to come off accidentally.

Corona 4180 spiral scissors

The coil source (on the cutting box) opposite the spiral (under the cutting box). The spool spring created just enough pressure to keep the handles open, but not so much that they would not close easily when you were cutting.

Enough bumper

Bumpers are used to absorb shocks and prevent the clipper handles from collapsing after the cut is completed, which would cause unnecessary hand fatigue. Front shears have either a double bumper (one in each handle) or just one in one handle.

The Corona Branch & Stem Pruner BP 4180 has only one bumper located on the top handle. I felt like it was made of a piece of semi-rigid plastic and I felt it was quite rigid. I’m used to soft, soft, rubber bumpers that actually take the impact factor off the clipper after the cut is complete. Although the 4180 bumper has done the job, I have seen better bumpers.

Another thing that ruined some of the cutting edge was bending the nylon hands after the cut was completed. The flexibility was not significant but it helped with all the shock absorption.

Optimize the blade tension

The optimized pressure between the blades is made by loosening or tightening the hex nut that runs through the center of each blade. This can be easily done with an adjustable wrench.

Corona 4180 bumper

The rigid plastic-like bumper did not reduce the shock as much as I would have liked, but it was enough

Corona 4180 adjustment nut for snow plow

The blade tension is easy to adjust with an adjustable wrench

Effective locking equipment

The cutters are equipped with a slide that moves the pin in place to keep the blades in a locked position.

It was easy to control the thumb lock with one hand by simply sliding the button back and forth. (You can see how it works in the video above). Please note that these bypass cutters are for right-handed use only. One-handed operation for the thumb lock is therefore only possible with the right hand.

Corona 4180 thumb lock for cut

A lock that could be moved with the thumb was easy to use and kept the beams securely closed

Mowing results

I had no problem cutting through a ½ inch mesquite tree (which is very hard). I’m more than sure these fleas would cut into specified 5/8 inch diameter materials when used in softer woods such as pine, tulip trees, apples and the like.

Corona 4180 beautician cut twig

Cutting ½ inch mesquite wood (very hard material) was no problem for BP 4180. I know it will have no problem cutting softer wood with 5/8 inch cutting capacity.

To gain a foothold in the smallest spaces, the cutting head was deliberately moved. I like this feature and have found that it works exactly as intended.

Corona 4180 scissors against cutting head

The curved design of the head made it easy to reach dense intersections

Note that these loppers are best for those with medium-sized hands. Someone with smaller hands can still use it, but the cutting blades do not open as wide, which limits the diameter of the material being cut.

Eco-friendly handles

One of the great features of these loppers is the ergonomic handles. They sit comfortably in the hand and offer a very tight grip.

I usually prefer non-slip icing on the clipper handles, especially if the handles are made of nylon (which can be a bit slippery with wet hands). In this case, however, I found that the Branch & Stem Pruner did not need coating due to the sculpted finger ridges in the lower handle. This more than made up for the lack of slipperiness and my hand did not slip from the grips, even when it was wet or sweaty.

Ergonomic handles Corona 4180 loppers

Eco-friendly handles at the top and bottom ensure that the earthquakes are very comfortable to hold. The lower handle with pre-shaped fingertips prevents your hand from slipping.

Many spare parts available

A great feature of these loppers is that each part is interchangeable except the nylon handles. Visit the Corona website Order items.

As long as you take care of the handles, these loppers will last a lifetime as they can be rebuilt at any time.

Torx screws are required to replace the blade

The BP 4180 bypass cutters use Torx screws (registered trademark of Camcar Textron) to attach the cutter head to the handles. For that you need special screwdriver (T-20) which many probably do not have. Fortunately, I have a number of Torx drivers that allow it to be a breeze to install new blades.

I have gone over other bypass cutters that have a slot (flat head) in the torx head that allows a regular homeowner to use a standard screwdriver to cut the blade equipment for adjustment / replacement. I would like to see this feature in the future design settings of the BP 4180.

Corona 4180 seconds Torx screws

To adjust / replace screws you need a special Torx screwdriver – not a device that most people have around the house.

Corona 4180 beautician Torx screwdriver

This Torx screwdriver, also known as a “Star Drive”, is a special tool for removing / replacing screws in BP 4180 snowboards.


I want Corona to consider two things if they ever do a redesign. First, get a screw that can be loosened or tightened with a standard flat-blade screwdriver instead of a Torx screwdriver. Secondly, I would replace the bumper material with a much softer one.


As with all gardening or landscaping equipment, proper care will significantly extend its useful life. For more information, see the articles and videos below.

Replacement and maintenance of snow products

How to sharpen bypass scissors


For gardeners and home gardeners, it is a good idea to use gloves when cutting, but it is a personal choice. Some people believe that they can achieve better dexterity with the bare or gloved hand. I like it Atlas nitrile gloves They offer excellent grip and dexterity, good cutting resistance and at the same time keep your hands clean.

Finally, safety goggles are another good thing. A twig or rose bush in the eye can make a very bad day. I always recommend it Wiley X safety goggles.


Corona has a limited lifetime warranty against defects in materials and workmanship.


Overall, I like these bypass scissors. It is light, durable, has a tight tolerance and fits well and is smart. The ecological design of the handle ensures that the tool lies comfortably in the hand and the corner cutting head is ideal in tight spaces. Spare parts are always good and the Corona Branch & Stem Pruner BP 4180 has everything but the handles. The saw blade is moist and easily cuts through very hard wood, although the bumper could use improvements. Combine it all with a very reasonable price and these shakes are a great click for your money.


The best thing you can do is get Corona Branch & Stem Bypass Pruner (BP 4180) from Amazon.

Spare parts are available directly from Corona on your website

Last updated 23/03/2021 / Related links / Images from the Amazon API for product ads