CAP Barbell 40lbs Adjustable Dumbbell

Last updated date: May 21, 2020

DWYM Score

CAP Barbell 40lbs Adjustable Dumbbell

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Overall Take

Even though the CAP Barbell 40lbs Adjustable Dumbbell has a budget-friendly price tag, it doesn't lack in quality construction. The cast iron plates are solid and feature a semi-gloss finish that resists rust. Additionally, the threaded rubber trim collars keep the weights securely in place. So, you don't ever have to worry about them slipping off the handles. We liked how simple and classic this set was during our testing. In our analysis of 212 expert reviews, the CAP Barbell CAP Barbell 40lbs Adjustable Dumbbell placed 11th when we looked at the top 14 products in the category. For the full ranking, see below.

Editor's Note May 21, 2020:
Checkout The Best Adjustable Dumbbells for a detailed review of all the top .

Expert Summarized Score
17 expert reviews
User Summarized Score
1,957 user reviews
Our Favorite Video Reviews
What experts liked
Caters to athletes of all abilities with a variety of plate weights along with dumbbells that set up to match various weight preferences.
- BestReviews
Two spin-lock collars are included, so the weighted plates don’t go sliding off the handles.
- Much Needed
Its comfortable handles and rubber trim collars promote convenience.
- Rainy Day Fitness
The dumbbells can be stored easily.
- List Outdoor
Included with the purchase is an easy to access carry case made from heavy duty plastic. This case has a storage spot for each piece and a secure lid to conceal and secure them.
- Fitness Equipment Reviews
February 2, 2019 | Full review
It has solid case helps to protect the plates and prevent any from being misplaced.
- USA Home Gym
Overall a very solid set of dumbbells that do not include any plastic parts, unlike some of the expensive adjustable dumbbells, the Caps can be dropped from a height if you like to train to failure, no need to worry about breaking expensive adjustment systems with plastic mechanics inside. You can throw these around if you wish, they are almost unbreakable.
- Jay's Home Gym
Durable cast iron plate has a semi-gloss finish makes it rust and maintenance-free.
- The Top 10 Best Reviews
October 22, 2017 | Full review
Spin On Collars: this type of collar is my favorite. My barbells have them too. Sure, a turn on the collar is not as trendy nor cutting-edge as some of the locking systems found on other adjustable dumbbells are; however, the spinons feel so stable and safe to me!
- Form Me Fit
What I like about the Cap Barbell 40-Pound Dumbbell Set is it comes with removable plates. These plates are cast iron and extremely durable.
- Optimum Fitness
Attractive – These are made keeping the look in mind for sure. The bar and plates come with a beautiful baked black enamel finish. This makes the dumbbells stand out.
- Tech Impose
November 11, 2018 | Full review
It is compact size, with carrying case.
- Diets In Review
The plates in this dumbbell set come in cast iron. This ensures that these don’t get rusted while you use them on a regular basis.
- Top Two Reviews
What experts didn't like
Rare complaints of a strong chemical odor which often lingers on hands after use.
- BestReviews
Only 40 pounds total maximum weight.
- Much Needed
The paint can sometimes chip-off.
- Rainy Day Fitness
Simplistic product.
- List Outdoor
Not a large weight range.
- Fitness Equipment Reviews
February 2, 2019 | Full review
Depending on the speed of your strength gains, you may find you grow out of the 40 lb limit quite quickly. (Additional weight plates can be purchased to upgrade the weight)
- USA Home Gym
Only 40lb of weight in the set.
- Jay's Home Gym
Some people will find the grip a bit too rough.
- The Top 10 Best Reviews
October 22, 2017 | Full review
Handle Ends: they can hurt you if you rest the pointy end of the handles on your thigh while they are loaded up. You may accidentally do this when getting ready to do some heavy dumbbell bench presses.
- Form Me Fit
Odor – These can be a bit smelly to use sometimes. But that’s the case with all cast iron products in fitness. This is a problem only if you are ultra sensitive about odors.
- Tech Impose
November 11, 2018 | Full review
Some users may prefer to adjust weights in smaller increments.
- Diets In Review
There are no rubber washers on either end of the dumbbell bar. As a result of this, the weights sometimes keep clanging against each other.
- Top Two Reviews

From The Manufacturer

Versatile dumbbell set for beginners or experienced weightlifters Easily and quickly expand your home gym Several weight combinations - heavy enough for light chest presses, light enough for bicep curls and tricep extensions Machined-grip, threaded steel bars with spin-lock collars for safety and security Convenient and durable carrying case for simple storage and transport Set includes four 2.5-pound plates, four 5-pound plates, two threaded bars, four spin-lock collars, and carrying case Manufacturer's warranty included - see Product Guarantee for complete details CAP Barbell is a leading distributor and provider of fitness equipment. Launched in 1982 with a small inventory of free weights and benches, CAP Barbell has grown over the past 20+ years to include more than 600 products in 10 categories. Headquartered in Houston, Texas, CAP Barbell is dedicated to providing quality fitness equipment at competitive prices, by constructively designing, accurately testing, and manufacturing its products to perfection. Fully adjustable dumbbell - up to 40 lbs.. Create several weight combinations. Threaded steel bar with spin-lock collars. Includes sturdy carrying case . Manufacturer's warranty included . Enjoy the versatility of gym equipment from the comfort of your own home with the Cap Barbell 40 Pound Dumbbell Set. Equipped with four 2.5-pound plates, four 5-pound plates, and two handles and collars, the set allows you to work with a variety of interchangeable weights in one easy-to-use and store set. The sturdy plastic carry case keeps the weights organized and accessible when not in use and also makes it possible to carry your weights with you so you never have to leave your training regimen behind. Designed for high-performance comfort, the Cap Barbells feature ergonomic grips, comfort handles, and rubber trim collars. The durable cast iron plates have a semi-gloss finish for long-term rust- and maintenance-free use, and the collars are threaded for a safe and secure fit to the handles. The carry case is not bulky, measuring just 20 inches long by 9 inches wide, and weighs 41.15 pounds in total.

Overall Product Rankings

Bowflex SelectTech 552
1. Bowflex SelectTech 552
Overall Score: 9.6
Expert Reviews: 43
2. CAP Barbell 40-200 Pound Adjustable Dumbbell, 1-Pair
Overall Score: 9.3
Expert Reviews: 4
Power Block Adjustable Speedblock
3. Power Block Adjustable Speedblock
Overall Score: 9.2
Expert Reviews: 11
4. POWERBLOCK 50 10-50 Pound Adjustable Dumbell
Overall Score: 9.1
Expert Reviews: 1
5. Topeakmart 66 Pound Adjustable Dumbbell, 1-Pair
Overall Score: 9.0
Expert Reviews: 3
6. TELK 45-200 Pound Adjustable Dumbbell, 1-Pair
Overall Score: 8.9
Expert Reviews: 2
Ringstar Starring Adjustable Dumbbells
7. Ringstar Starring Adjustable Dumbbells
Overall Score: 8.9
Expert Reviews: 10
8. TELK Adjustable Dumbbells
Overall Score: 8.9
Expert Reviews: 8
Bowflex SelectTech 1090 Adjustable Dumbbell
9. Bowflex SelectTech 1090 Adjustable Dumbbell
Overall Score: 8.9
Expert Reviews: 19
PowerBlock Elite Dumbbells
10. PowerBlock Elite Dumbbells
Overall Score: 8.9
Expert Reviews: 21
CAP Barbell 40lbs Adjustable Dumbbell
11. CAP Barbell 40lbs Adjustable Dumbbell
Overall Score: 8.9
Expert Reviews: 17
12. Yes4All Adjustable Dumbbells
Overall Score: 8.9
Expert Reviews: 29
13. Cast Iron Adjustable Dumbbells
Overall Score: 8.7
Expert Reviews: 11
14. Bayou Fitness Adjustable Dumbbell
Overall Score: 8.6
Expert Reviews: 16

An Overview On

When it comes to gym equipment, dumbbells are the most versatile. They are an excellent tool for building muscle, and they can be used by almost anyone. Whether you are a novice with a physical limitation or an advanced athlete, adjustable dumbbells can be incorporated into your workout routine. For example, you can use low-weight dumbbells while seated, or add pounds to the dumbbells to use while standing.

Perhaps the first feature you’ll want to look for when shopping for adjustable dumbbells is shape. While the majority of dumbbells are made up of the traditional wheels with a metal bar in between, there are models with a square or hexagon shape. There are several benefits to each design. For example, the POWERBLOCK 50 10-50 Pound Adjustable Dumbell have a square shape that will rest flat on the ground. That means you’ll be able to do push-ups off of them. Of course, the circular models may feel more comfortable to hold, depending on your preferences.

Next, determine your total goal in pounds for lifting weights. Look for a set of dumbbells that will allow you to work your way up to that specific weight. So if you want to max out at 50 pounds, you don’t want to buy a set of adjustable dumbbells that only offer a total of 40 pounds. Otherwise, you’d never reach your goal, or you’d have to fork over money for a new set of dumbbells.

While reviewing the total weight, you’ll also need to look for the starting weight and what increments the dumbbell set uses to work you up to your total goal weight. Are there 2.5, 3 or 5-pound increments? Is it easy to add each new weight to the dumbbell? You want to be able to work at your own pace to reach your desired results.

Make sure the set of free weights you’re interested in is made of quality material. It is common to see adjustable dumbbells made of metal, rubber or metal and rubber.

Consider whether the dumbbells have any special features. For example, some models have ergonomic grips so your hands don’t slip when you start to work up a sweat. You’ll also want to look for threaded collars that allow for a more secure fit, a finish that prevents rust and corrosion and weights that are compact enough to fit in your storage space.

DWYM Fun Fact

In 1764, Charles Messier discovered a planetary nebula, officially named Messier 27. Since the nebula looked so much like the popular dumbbell exercisers use to lift weights, it got the nickname the “Dumbbell nebula.” According to NASA, you’d need to travel 1,360 light years to reach the Dumbbell nebula, which is located within the Vulpecula constellation.

When it comes to physical dumbbells that are used for weight training, the first model can be traced back over 2,000 years to Greece. In the 5th century BC, the Greeks had a version of the dumbbell that they referred to as halteres. They used this device to perform lunges, abdominal side bends and bicep curls.

It wasn’t until 1846 that dumbbells became commonplace in America. This was all thanks to John Blundell writing and publishing the book, “The Muscles and Their Story.” Fitness buffs took note of how using the dumbbell benefited various muscle groups and began inventing new exercises for the dumbbell to work almost every muscle in the body. Today, fitness trainers may instruct you to complete everything from tricep kickbacks to seated shoulder presses to flat and incline chest presses.

The Adjustable Dumbbells Buying Guide

  • To maintain your free weights and keep them in excellent shape, you’ll need to set them down carefully at the end of each session, instead of throwing them on the floor. Not only is this bad for the dumbbells, but it could potentially damage your floors as well. Equally as important is not banging the free weights together.
  • Cleaning is also essential to your maintenance routine. Simply mix a little dish soap in warm water, and use the solution to wipe down your gear. Afterward, you’ll need to take a clean dry cloth and dry off the dumbbells. If you allow the weights to air dry, they may rust, so don’t skip this step unless your dumbbells are made entirely of rubber.
  • Even though adjustable dumbbells can be used by almost anyone, it is still important to learn the proper form before attempting to exercise with the free weights. You’ll want to check out reputable online videos or consult with a personal trainer to learn the best way to use the equipment so that you don’t pull or injure your muscles in any way.
  • Some adjustable dumbbell models come with expansion kits. For example, some dumbbells are up to 50 pounds, but workout enthusiasts who want to push themselves can often order a 70- to 90-pound expansion kit without having to purchase a whole new free weights set. This is an excellent option to have if you think anyone in the home may eventually surpass their original goals.
  • Look for the opportunity to connect to the company’s app. Bowflex has a free download that its customers can take advantage of. With the app, you can create a workout, follow workouts that are already downloaded to the app and track your progress in the area of physical fitness.
  • The price for adjustable dumbbells varies based on features and the total weight offered. No matter what, you’re sure to find a set that fits your budget.