Choose KingPin if:
- Your machine uses a 10mm selector pin.
- You want heavier, more stable loading.
- You are adding Olympic plates beyond the standard stack.
Choose Original GymPin if:
- You need 8mm or 10mm options.
- You want the standard cable stack extender.
- You are unsure which size your machine takes.
EXTEND YOUR CABLE MACHINE WITH THE KINGPIN
Built for bigger loads on compatible 10mm pin-loaded machines
The KingPin is the extra-long version of our Original 2" GymPin, designed for lifters who need more loading room, more progression, and more headroom when the built-in weight stack is no longer enough.
Simply insert the 10mm pin into a compatible weight stack, load 2" Olympic plates onto the large end, and keep pushing your cable work beyond the machine’s standard limit.
With a longer 200mm loading sleeve, The KingPin gives you extra capacity for heavier rows, pulldowns, presses, curls, triceps work, belt squat setups and serious progressive overload.
Precision-manufactured in the UK using high-quality materials, The KingPin is built for bodybuilders, powerlifters, strength athletes, PT studios and commercial gyms that need a simple way to add serious resistance to compatible machines.
THE KINGPIN
LOAD MORE. PULL HEAVIER. OUTGROW THE STACK.
LOAD MORE. PULL HEAVIER. OUTGROW THE STACK.
The KingPin is GymPin’s extra-long 10mm weight stack extender, built to let serious lifters add Olympic plates to compatible pin-loaded machines when the standard stack has tapped out.
How it works
1
CHECK YOUR MACHINE
Make sure your cable machine uses a compatible 10mm selector pin before ordering The KingPin.
2
INSERT INTO THE STACK
Slide The KingPin into the weight stack just like a standard selector pin
3
LOAD OLYMPIC PLATES
Add 2" Olympic plates to the extended sleeve and keep progressing beyond the stack.
Product Information
The KingPin is designed for lifters who want to add serious extra resistance to compatible selectorised cable machines when the standard weight stack is no longer enough.
Instead of being limited by the built-in stack, The KingPin allows you to load 2" Olympic weight plates directly onto the extended sleeve, giving you more room to progress on heavy cable movements.
With its longer loading sleeve and 10mm small-end diameter, The KingPin is built for compatible machines that use a 10mm selector pin.
Simply check your machine’s pin size, insert The KingPin into the weight stack, load Olympic plates onto the large end, and train beyond the standard stack.
The KingPin is for lifters who have outgrown the standard weight stack and need more loading capacity from their cable machines.
It is ideal for bodybuilders, powerlifters, strength athletes, PTs, serious home gym owners and commercial gyms that need a simple way to add heavier resistance.
Use it for movements such as heavy rows, lat pulldowns, cable presses, triceps work, curls, glute work and other cable exercises where the machine’s built-in stack is no longer enough.
The KingPin is best suited to users who already understand their machine setup and need a stronger, longer 10mm loading solution.
GymPin created The KingPin for lifters who needed more than the Original 2" GymPin could offer.
Some athletes do not just need to add plates. They need more plate-loading space, more headroom, and a product built specifically for heavier progression.
The KingPin keeps the same simple idea as the Original GymPin, but gives you an extended loading sleeve for bigger jumps, heavier work and more demanding training sessions.
It is a straightforward answer to a common problem: the stack runs out before the lifter does.
The KingPin is a 10mm product only.
Before ordering, check that your cable machine uses a compatible 10mm selector pin. The KingPin is not suitable for 8mm selector pin holes.
The large end is designed for 2" Olympic weight plates. It is not designed for standard 1" plates.
Compatibility can vary between machine brands and models, so always check your machine’s selector pin diameter, available clearance, and weight stack design before use.
The KingPin should slide cleanly into the stack without forcing. If it does not fit correctly, do not use it.
Always check that The KingPin is fully inserted into the weight stack before loading plates.
Only use The KingPin with compatible machines that accept a 10mm selector pin. Do not force it into a machine that is not designed for it.
Load Olympic plates evenly and sensibly. Do not exceed the safe working limits of your machine, cable, pulley system or weight stack.
Make sure the added plates have enough clearance throughout the full movement. Stop immediately if plates, cables, guards or machine parts interfere with the exercise.
Inspect The KingPin and your machine before use. Do not use damaged equipment.
The KingPin adds extra resistance to your machine, but it does not increase the machine’s own safety rating. Train with control and use good judgement.
Product specifications
Product Type
Extra-long cable machine weight stack extender
Material
Precision-machined Aluminium and High Tensile Construction Grade Steel
Small End Diameter
10mm only
Small End Length
102mm
Large End Diameter
49.5mm
Large End Length
200mm
Plate Compatibility
Designed for 2" Olympic weight plates
Machine Compatibility
Compatible with selectorised cable machines that use a 10mm selector pin
Use Case
Adds Olympic plates to compatible cable machines when the built-in stack is no longer enough
Progression Type
Helps increase resistance beyond the standard weight stack
Weight
Helps increase resistance beyond the standard weight stack
Weight
Approx. 1125g / 2.48lb
Finish Options
Raw, Polished or Black
MAX LOAD
60kg recommended max load. Do not slam the stack
Available Options
Single KingPin
Included
1 × The KingPin
Quality Assured
Each KingPin is quality checked before dispatch
CHOOSE YOUR KINGPIN FINISH
Choose the KingPin finish that suits your setup. Every KingPin is the same extra-long 10mm cable machine weight stack extender, built to let you add 2" Olympic plates to compatible selectorised machines when the standard stack is no longer enough.
RAW KINGPIN
Original, industrial and built to work. The Raw KingPin has a stripped-back machined finish for lifters who want a serious 10mm weight stack extender without the shine.
Choose Raw
CHOOSE RAW KINGPIN
A brighter, cleaner metal finish with a premium look. The Polished KingPin gives you the same extra-long Olympic plate loading capacity with a sharper, showpiece appearance.
CHOOSE POLISHED KINGPIN
BLACK KINGPIN
A stealth finish with a strong, understated look. The Black KingPin is ideal for black racks, commercial gyms and serious cable machine setups that need extra loading capacity without shouting.
CHOOSE BLACK KINGPIN
KingPin FAQ
Yes. Always make sure The KingPin is fully inserted into the weight stack before loading plates.
Only use it with compatible machines that accept a 10mm selector pin. Do not force it into an unsuitable machine.
Load plates evenly and sensibly. Make sure the plates have enough clearance and do not hit the frame, guards, cables or other parts of the machine during the movement.
We recommend a 60kg max load and strongly advise that you do not slam the stack. Controlled reps protect your machine, your cable system, your plates and The KingPin itself.
Inspect The KingPin and your machine before use. Do not use damaged equipment.
The KingPin is available in 10mm only.
Unlike the Original 2" GymPin, which is available in 8mm and 10mm options, The KingPin is our maxed-out GymPin. It is built for compatible machines that use a 10mm selector pin and is designed for heavier loading, extra sleeve length and serious progression.
We do not make an 8mm KingPin because the longer loading design creates greater leverage. In simple terms, an 8mm version would not offer the same level of stability for the type of use The KingPin is designed for.
The KingPin is designed as our biggest and strongest GymPin option, so it is made for compatible 10mm cable machines only.
Because The KingPin has a longer loading sleeve and is intended for heavier use, the physics matters. A smaller 8mm pin would have less stability under this type of extended loading, so we do not offer an 8mm version.
If your machine uses an 8mm selector pin, choose the Original 2" GymPin in 8mm instead.
Yes. The KingPin is suitable for serious home gyms, PT studios and commercial gym environments, provided the machine is compatible with a 10mm selector pin.
It is designed for lifters who have outgrown the standard weight stack and need a simple way to add 2" Olympic plates to compatible selectorised cable machines.
The KingPin lets you add extra weight to compatible selectorised cable machines when the built-in weight stack is no longer enough.
Insert The KingPin into a compatible 10mm weight stack, load 2" Olympic plates onto the extended sleeve, and keep progressing on heavy cable rows, pulldowns, presses, curls, triceps work and other cable movements.
The KingPin is designed to fit compatible machines that use a 10mm selector pin.
Before ordering, check your existing machine pin diameter, weight stack design and available clearance. The KingPin should slide into the stack cleanly without being forced.
If your machine uses an 8mm selector pin, The KingPin will not be suitable. You will need the Original 2" GymPin in 8mm instead.
The KingPin is designed for 2" Olympic weight plates.
It is not designed for standard 1" plates. Always make sure the plates sit securely on the loading sleeve and have enough clearance throughout the full movement.
The KingPin is precision-manufactured from high-quality metal components and built for serious loading.
It is designed to be strong, stable and reliable when used correctly with compatible 10mm selectorised cable machines.
No. The KingPin is designed to be used without modifying your machine.
It works by replacing the standard selector pin in a compatible 10mm weight stack. Insert it into the stack, add Olympic plates to the sleeve, and train with added resistance.
Never drill, alter or force your machine to make The KingPin fit.
We state a 60kg recommended max load for The KingPin.
We know some users have loaded more, but our guidance is deliberately sensible because every machine, cable, pulley and weight stack setup is different.
The KingPin may be strong, but it does not increase the safety rating of your machine.
High-tensile Stainless Steel Pin
Repeated tests of materials enabled us to land upon this trusty stainless steel pin. Only available in 10mm as this is our KingPin, the maximum version of the GymPin.
Hewn from a solid Aluminium Ingot
We seek the finest quality aluminium to deliver strict standards in both appearance and longevity.
Trusted GymPin Brand
Known for the quality of both manufacturing and design. Each GymPin is meticulously tested prior to dispatch.
Three Rings for Grip
Added grip with three perfectly machined rings.
BUY TWO KINGPINS AND SAVE
Train heavier across more machines
Build a stronger setup with a matching pair of KingPins and save when you buy together. Ideal for serious home gyms, PT studios and commercial facilities with multiple compatible 10mm cable machines.
Use one KingPin on your main cable station and keep a second ready for another machine, training partner, or busy gym floor. Same extra-long loading capacity. Same 10mm fit. More options when the stack runs out.
Customers praised this weight stack extender as a "lifechanger" for progressive overload when gym machines are maxed out. Reviews highlight excellent quality, strength, and durability. Some noted compatibility issues - measure your machine's diameter (10mm) before ordering. A few mentioned the pin can slide or tip with heavy loads, requiring extra bracing. Minor concerns about shipping costs and tariffs.
A
POLISHED / One (x1)
Great
Hi there! We're thrilled to hear you enjoyed the KingPin. Thanks for the awesome review!
A
First use today : on the leg extension with 10kg it’s perfect
But on the adductor machine, I added 75kg and the pin seems to slide a little and lean out the machine. I checked the machine and it’s compatible (hammer strenght).
Maybe I misplaced the pin. I will see in the coming days how it is going
But globally I appreciate the product
Hi Aorsoni, thanks for the review and for giving the GymPin a try.
Great to hear it worked perfectly on the leg extension. On some adductor machines the weight stack holes can be slightly larger or worn over time, which can allow a little movement or lean when heavier loads are used. It doesn’t usually affect safety or performance, but it can feel a bit different depending on the machine design.
It’s also worth just double-checking the pin is fully seated through the centre of the stack plate.
If it continues to feel unusual over the next few sessions, feel free to drop us a message with a quick photo of the machine and we’ll happily take a look and help.
Really appreciate the feedback and glad you’re enjoying the product overall.
A
POLISHED / One (x1)
I used the thing in one set and the thing looks like its been used for months
Hi Arttu,
Thank you for your feedback.
Our polished GymPins have a bright, mirror-style finish. Once they’re loaded and used, they will naturally develop surface marks and scratches where plates make contact. That wear isn’t a sign of being used previously, it’s simply the reality of steel under load and, in many ways, the hallmarks of lifting.
Every GymPin is shipped brand new. We do not sell used items.
For customers who prefer a finish that embraces wear more subtly over time, we now also offer a RAW version, which develops a more uniform, natural patina as it’s used.
If you believe there was anything beyond normal plate contact marking on arrival, please contact us directly and we’ll be happy to review it for you.
Thank you again for taking the time to share your thoughts.
The GymPin Team
N
POLISHED / One (x1)
I had bought two separate "stack extenders" off of Amazon before this, and both bent within the first few sessions. After caving and getting the real deal, it was somehow way lighter and way stronger. I managed to get five plates on an adductor machine, they started slipping off and putting all the weight on the end of the pin, and somehow did not bend in the slightest. Genuinely don't know what kind of witchcraft is going on to make these so good.
A
POLISHED / One (x1)
It’s a well made pin but the pin is around 10mm too long for the stacks on my cable machine
a
POLISHED / One (x1)
So I made the rookie mistake of buying a cheaper version prior to this that had bent on me instantly. Needless to say I wish I hadn't done that. This is immaculate, super sturdy and holds decent weight even with a pretty large cover on the weight stack. I know people who have had their gympin for years so it stands the test of time. StrengthMax Machines here in Ireland take the 10mm pin.
A
RAW / One (x1)
Very good product it allows me to add extra weight and progress on my machine lifts when i already maxed out the stacks at my gym. The stacks at my gym are light so this allows me to further my progression.
Hi there! We're thrilled to hear the KingPin is helping you push your limits. Thanks for sharing your experience and happy lifting!
G
RAW / One (x1)
The extra length is amazing, but the pin insert when you put it in the machine is a little bit thin.
I need to use a strap and a clamp once I’ve loaded the plates onto it!!
Hi George, thank you for your feedback! We're glad you love the extra length. We appreciate your input about the pin insert and will consider it for future improvements. If you need any assistance, feel free to reach out! We would be keen to discover the make of the machine you are using? The KingPin is a 10mm pin.
F
great product, arrived fast but didnt fit the stacks in my gym, forgot to measure the diameter, its 8mm and not 10mm so i ordered an 8mm one now, im keeping this one tho in case i switch gyms at some point and for now its nice room decoration, this piece of metal feels heavy and good quality. i like it
Thanks so much, Fabrice. We really appreciate the 5-star review and the kind words on the quality and delivery.
You’re absolutely right, the stack pin diameter is the key measurement, so the 8mm version should be the one for your gym. Glad to hear you’ve got that sorted, and hopefully the 10mm one makes a very solid piece of gym-room decor for now!
C
RAW / One (x1)
Best progressive overload tool along the best ones. The only pin that can make my adductor machine still a challenge
Great to hear The King is doing exactly what it was built for, keeping those machines challenging when the stack runs out. Love that it’s helping with progressive overload on the adductor machine.
A
RAW / One (x1)
Great!
Thanks for the feedback! Glad you’re enjoying it 💪
A
RAW / Two (x2)
Fast shipping
Fast shipping. No downtime. That’s the goal. Thanks, Angel.
If you want, I can tailor replies based on product too (KingPin vs Original vs accessories) to subtly reinforce positioning.
F
RAW / One (x1)
the title is pretty self-explanatory. Sadly, my gym has only bumber plates so I'm pretty limited with how much more I can load due to the thickness of each plate. However the kingpin becomes very helpful with microloading too and I highly recommend getting one
Appreciate that Filippo, “goated” is hard to top 🙌
You’ve nailed one of the real limitations with bumper plates too. Great for certain lifts, but not ideal when you’re trying to push past stack limits due to the thickness.
Glad the KingPin’s helping you work around that with microloading, that’s exactly where it comes into its own.
Thanks again for the support and the recommendation 💪
A
RAW / One (x1)
Did what it needed to do.
Nice and simple — just how it should be. Glad it did exactly what you needed. Appreciate the review
R
Great product however 2 months later I received a bill in the mail from fedex for tariffs. I paid $32 in shipping and now I have to pay tariffs too? This is not ok. Beware anyone from the United States or another country.
Hi R Chao,
Thank you for your review and for the positive comments about the product — we genuinely appreciate that.
We completely understand how frustrating it is to receive a customs invoice well after delivery. For international orders, import duties and tariffs are set and collected by the destination country’s government, not by us or the courier. These charges are separate from the shipping fee paid at checkout, and unfortunately we have no control over whether or when they are applied.
We do make this clear on our listings, as policies and enforcement vary by country and even by shipment. Some parcels are assessed, others are not, which can understandably feel inconsistent.
If you’d like to send us a message with your order details, we’re happy to review it with you and make sure everything was processed correctly on our side.
We truly appreciate your support and your feedback.
T
RAW / One (x1)
So easy to use and very solid
J
Todo muy bien
A
Finally pulled the trigger and got a gym pin. I had been putting it off because of the price, but since my screwdriver broke, I decided it was time. Now I can finally load up the adductor machine and make real progress again!
Thanks for the review. We hear that a lot, and you’re right, once you’ve used a proper GymPin there’s no going back to improvised fixes. Glad it’s helping you load the adductor properly again and make real progress. Appreciate you taking the leap and sharing your experience.
A
RAW / One (x1)
Good
J
Its great, keeps my plates straight and tight.
Joe
L
RAW / One (x1)
Great bit of kit, robust and reliable, would definitely recommend.
J
Pin doesn’t fit in machine. Its too big
Thanks for your review, Jonathan.
The KingPin is our extra-long GymPin, designed specifically for pin-loaded machines that use a 10mm pin and have sufficient clearance for extended pin length. As noted in the product description, compatibility does vary between machines, and this model won’t fit all selectorised stacks.
We’re always happy to help customers confirm compatibility before purchase. If you’d like to contact our support team, we can advise on the most suitable GymPin for your machine.
l
RAW / One (x1)
ts fire
Thank you for your feedback! Fire!!!
E
RAW / One (x1)
Such an amazing piece to have during your workouts.
Ethan what a pleasure to read your review of our KingPin, it's a favourite of ours and is growing in popularity. Enjoy the lifting!
Built for progressive overload
Progressive overload is simple: if you want to keep building strength and muscle, your training needs to keep moving forward.
For many lifters, cable machines eventually become the limiting factor. You can control the movement, hit the target muscle properly, and keep your form locked in, but once the weight stack runs out, adding more load is not always straightforward.
That is where The KingPin comes in.
The KingPin is GymPin's extra-long 10mm weight stack extender, designed to let you add 2" Olympic plates to compatible cable machines when the built-in stack is no longer enough. It gives serious lifters more loading room for heavy rows, pulldowns, presses, triceps work, curls and other cable movements where measurable progression matters.
Instead of abandoning a productive exercise because the stack has topped out, The KingPin helps you keep that same movement in your programme for longer.
Want to understand how GymPins support muscle building and progressive overload?
IMportant Information
Everything you need to know
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Please note: International orders (outside the UK) are shipped excluding VAT, taxes, and import charges. Your order may be subject to VAT, customs duties, and handling fees upon arrival in the destination country.
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Shipping calculated during checkout and they originate from one of our distribution partners. Direct in the UK and or Amazon in other Territories.
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30 Days Returns - Subject to 15% Restock Fee - Check Diameters of Equipment you Require Prior to Purchase.
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Unfortunately, our couriers do not support shipping to PO boxes, military bases or parcel hubs. Message our team for shipping questions.
