Adjustable Dumbbell (Single) 5-40/80lb, 5lb Increments, for Home Gym Fitness - Upto 20 weight settings
Condition: New
Buy Now, Pay Later
As low as
/ mo
Learn more
- – Up to 36-month term if approved
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Selected Option
Free shipping on this product
30-day returns
Learn more
30-day refund / replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Tuesday, Oct 20
Recently Viewed
Color: BLACK - 80LB
Features
- SMART DESIGN: Traditional adjustable dumbbell length remains fixed even with smaller weights. The adjustable dumbbell's length reduces with lower weight selection, providing you a wider range of arm movement. The vibrant colors with matte finish blends anywhere in your home.
- 1-SECOND WEIGHT CHANGE: One hand turn for fast weight adjustment. Enjoy fast adjustment and gain better training efficiency.
- SPECIFICATIONS: The dumbbell plates are made of 95% cast iron, hence are extremely durable.
- THIS PRODUCT IS SOLD AS A SINGLE DUMBBELL. Recommended quantity is to buy in a pair (Quantity = 2).
- WARRANTY & CUSTOMER CARE: Roburflex adjustable dumbbells come with a 2-year warranty which covers all functional damage to the product and replacement of all parts. Please contact roburflex customer support for any warranty claims or concerns (details are in the product manual).
Description
Roburflex strives to provide smart, appealing home strength training equipment that blend in with any part of your home. Roburflex strives to provide smart and elegant home strength training equipment. We focus on ensuring our products are durable and safe. An important aspect of our design is to make aesthetically appealing products that blend in with any part of your home while also enabling you to have an effective workout in less space. 5 - 80 Lbs Per Adjustable Dumbbell in 5 Lbs Increments Designed to target and strengthen your legs, back, chest, abs, shoulders, and arms. Smooth and Rapid Weight Adjustment Effortlessly switch between exercises with our quick-to-adjust selection dials. Storage Base with Handles allows you to move the adjustable dumbbell set effortlessly from one location to another. 40LB Dumbbell 40LB Extension Adjustable Dumbbell Stand INCLUDES Adjustable Dumbbell from 5 lbs to 40 lbs INCLUDES Up to 80lb extension and larger cradle COMPATIBLE WITH All Roburflex Dumbbells GREAT FOR Strength Training Exercises in your Home Gym GREAT FOR Improving your fitness regime GREAT FOR Ergonomic Height Reduces Bending and Back Injury
Brand: Roburflex
Color: BLACK
Material: Cast Iron
Special Feature: Adjustable Weight
Product Dimensions: 21"L x 7"W
Brand Name: Roburflex
Set Name: Series 2
Unit Count: 1 Count
Number of Items: 1
Number of Packs: 1
Global Trade Identification Number: 10
Manufacturer: Krato Fitness
Model Number: RF-AD
Part Number: RF-AD
Item Dimensions L x W: 21"L x 7"W
Number of Pieces: 1
Color: BLACK
Style: Adjustable
Material: Cast Iron
Handle Material: Metal
Other Special Features of the Product: Adjustable Weight
Target Use Body Part: Arm
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Oct 20
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
I wanted to purchase a 50-lbs. adjustable dumbbell set, but shipment to Hawaii was a problem. The ROBURFLEX 40-lbs. adjustable dumbbell was the closest thing that I could find that was suitable and within budget. For me, this is a 5-star product. It does the job and I have nothing to compare it to. However, for people living in the lower-48, there probably are a lot more options within the same price range. For the majority of Amazon buyers, this may be closer to a 4-star product. Pros: - Easy weight adjustment mechanism: quick, simple, well-labeled. - Adjustable in 5 lbs. increments, starting at 5 lbs. - Compact profile. Whereas cheaper dumbbells use a fixed length system of weight adjustment, ROBURFLEX minimizes its footprint by adding length only whenever the dialed-in weights are increased. - Hand grip. Perfectly sized for a wide range of hand sizes, not too small and not too large. Knurling is well-executed. The barbell feels good in hand. - Cost. $300 for a set of 40 lbs. adjustable dumbbells was the cheapest option available for me. The next closest competitor cost $500 to purchase and ship to Hawaii. Cons: - 40 lbs. capacity. - Fit and feel. Manufacturing tolerances are "good enough", not great. While it doesn't feel nor look cheaply made, it does have a lot of rattle and loose play whenever lifting up from or returning the barbell back to its cradle. I cannot just grab the barbell or casually return the barbell from its carrier, I need to pay attention to how I’m positioning it. - Durability. There are a lot of negative reviews regarding durability. Knowing this, I am careful not to bang around nor drop the barbells. I am also careful whenever dialing in weights to ensure that I am not forcing it to do anything unnatural. * * * * * Notes regarding my dumbbell stand for the ROBURFLEX dumbbells: I used a pair of the following computer stands because of their all-metal construction and 80+ pound weight capacity: https://www.amazon.com/dp/B0FH9VHJCP I liked the fact that I could independently arrange each stand to suit my workout space. Also, I could adjust the height to fit my needs. I liked the storage provided by the second shelf plus side hooks. Heavy duty casters make rolling it easy, even on shag carpet. Lastly, there's an option for getting one with power outlets which simplifies the use of electronic devices. To hold down the dumbbell carrier to the base board, I used 30mm pipe straps. Since the pipes at the bottom of the carrier are 1-1/4" diameter, 32mm pipe straps would have been a better fit. However, 30mm were the closest size available to me and I installed them using a couple of thin washers to make up the difference. (If I wasn't so detail-oriented, I could have skipped the washers ... the 30mm pipe straps fit close enough to do the job by themselves.) The base board consists of 1/2" plywood. In turn, they are temporarily fastened to the computer stands with metal clamps. At some point in the future, I may remove the clamps and use metal screws to bolt the plywood down to the stand. (I didn't want to put holes in my computer stands until I was certain of the desired configuration.) The pair of computer stands cost me $82, which was significantly cheaper than other dumbbell rack options.
...
show more
Reviewed in the United States on July 13, 2026 by Robert
Great product and great customer support. I used it daily the past few months with no issues. Love it. Can’t ask for something better for the price.
Reviewed in the United States on July 24, 2026 by Victor
I’ve been wanting to build a home gym for a while but could never get past how much space a full dumbbell rack takes up. The Roburflex 40lb adjustable dumbbells solved that completely. One compact dumbbell replaces everything and they also look aesthetically pleasing which motivates me to work out even more. They are easy to setup, and the grip is decent as well. They give me plenty of range for my workouts and the quality feels legit.
...
show more
Reviewed in the United States on June 29, 2026 by Nazia M.
I almost learned firsthand why the exercise I was doing is also known skull crushers. A plate broke off one my dumbbells and fell on the floor, luckily not on my face. This happened during normal operation, as the dumbbells had never fell, and within one week to the day of the end of the two-year warranty. This is when I discovered that as pretty as these dumbbells are, the innards are made of plastic. Yes, plastic. The company denied my request for a full refund but send me a replacement part instead. And with it came a video of how to install it. The plastic part is attached to the weight disk by two pins made of, wait for it, plastic. And there's more, it was me, the customer, who they wanted to install this plastic-upon-plastic contraption and then use the things again. I considered selling them on Marketplace, but I decided it was unethical. I considered selling them as scrap metal, but I decided it wasn't worth the trip. I ended up trashing them in the dumpster, and I have to admit that was satisfying. I can't recommend this product to anyone.
...
show more
Reviewed in the United States on June 24, 2026 by Castillian
I purchased the set of two and these adjustable dumbbells have been great over the last year I have had them. So much more sturdy and easy to use, with only the handle to change the weight as compared to the Bowflex set that needed to change two dials to adjust the weight. I'm a personal trainer so I'm talking with some experience and when I'm doing drop sets or other sets that require a fast adjustment to the weight these are fantastic. I have these in my home gym and my Daughter, Wife and Son are all able to use them without any issue. Just needed to get used to making sure to line them up before making the weight adjustment. Their customer service has been great as well. I did have some questions and they replied very fast. Completely worth the cost.
...
show more
Reviewed in the United States on June 11, 2026 by Steven P. Wellever
I'm really happy with my Roburflex adjustable dumbbells. They’re super convenient because they save so much space and replace a whole rack of individual weights. The adjustment mechanism is nice and smooth, and they feel very solid during my lifts. Perfect for anyone wanting a simple, effective home gym setup.
...
show more
Reviewed in the United States on July 19, 2026 by Hannah
A friend of mine has these and has had good luck. However ever since buying them, the handles have been misaligned so the numbers on the handle set do not correctly state the weight. On one, the adjustable "wings" that snap out to hold the small weights in place do not work properly, so they small weights remain loose and are not safe to use, because they can fall off. I contacted Amazon customer service multiple times with little resolution. Therefore, I went to Roburflex direct. They immediately started the process of diagnosing the issue and replaced both handles very quickly. It has only been a few weeks since we received those, but all is good for right now. Their customer service was great once they knew about the issue. Not sure where the disconnect is between Amazon and Roburflex, but Roburflex was easy to deal with directly.
...
show more
Reviewed in the United States on June 22, 2026 by Nathan LaBonte
So now that I have been using the Ruborflex set for over a month, I figurerd this product definitely deserved a proper review. 1st video : the most important thing is adjustable dumbells is how seamless yet secure the switching from weight to weight is. This is the best product I have seen in seamless and safe switching from weight to weight. Every weight clicks in perfectly and the dumbell won't lift if it's not engaged properly . 1st image: the grip is precision knurled for lifting. Definitely much better than most of the smooth wear off knurled grips I have seen in the gyms. 2nd image : flat bottom gives you the advantage of stability for push-ups and likewise exercises. Yet keeping a very even weight distribution all over the hand/wrist area. 5th image: easy to lift, move around and put down without fear of shattering your fingers. Ergonomically speaking its an astute design. The matte army green looks great. I haven't seen other products in the same category offer such great color and texture finish. Overall, the ruborflex caters for everything one could expect out of an adjustable dumbell set. Great value for money. Even weight distribution and stability on both sides.
...
show more
Reviewed in the United States on May 23, 2024 by Omar Ahmad