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Heavy Duty Ribbed Plastic Round Inserts Sizes from 12.5mm to 114.3mm Outside Diametre

  • Heavy Duty Ribbed Scaffold Tube Insert for 48mm Outside Diametre Tube
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  • Feedback and Product Reviews
£0.24 (inc VAT:) £0.20 (exc VAT:)
Calculated at checkout

Product Description

We have a large range of Heavy duty ribbed inserts to fit most tube sizes and wall thicknesses. Please contact us if you cannot find what you need.

Help to understand what size you need

The first measurement shown is the Outside Diameter of the Tube and the last numbers represent the thickness of the tube that it will fit.  As these inserts are ribbed there are two measurements to show the variance in the wall thickness the insert will fit.  For example a 19mm x 2.0/1.5 insert.  The 19mm is the outside diameter measurement of the tube.  The 2.0 is the thickest tube wall thickness it will fit and the 1.5 is the thinnest tube wall thickness it will fit.


An easy way to calculate the inside diameter measurement and to check that the insert you select will fit is to first find the insert that is closest to the Outside measurement of your tube.

Double the wall thickness you have and subtract it from the Outside measurement.  In the 19mm x 2.0/1.5 example, if you double the 2.0 = 4mm and double the 1.5 = 3mm  This means that this insert will fit a tube with an OD of 19mm and and Inside Diameter of 19-4 = 15mm to 19-3 = 16mm - so Inside Diameter between 15 and 16mm.

So in this example if you need an insert to fit a tube with OD of 19mm and ID of between 15mm and 16mm then you have the right one.



Next Day Delivery: If you require your products on a next-day service, please ring us and check our stock levels of the products that you want to order. Any Next-Day deliveries must be ordered by 12 noon (mid-day). Any orders placed after that time slot may not be accounted for next-day delivery. Every order that is placed for a next-day delivery requires for a contact number to be put with the order so that if for any reason the courier cannot deliver they can call you. In a situation, where a delivery cannot take place the driver will leave a card providing details of where you can collect your undelivered parcel from. On some occasions we can even ship the same day! Get your orders in by 12pm Noon.


2nd Class: Royal Mail quote 2-3 working day delivery, including Saturdays. Please Note: *This is not a tracked service* If you require a tracked service that is not next-day delivery, please call us and we can arrange for this.


Air Mail – International Postage: Our prices are based on Royal Mail’s prices. We can ship anywhere outside of the UK.


Free Shipping: Where a product has free shipping listed on it, this applies to any deliveries in the UK. We cannot offer free shipping outside of the UK.




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Product Reviews

  1. Goods as described and fast delivery 5 Star Review

    Posted by on 8th Jun 2020

    I am a returning customer for these chair feet, they fit well into the tubular legs (old ones removed with a cork screw, new ones tapped in). Very easy. Fast delivery, no issues, very satisfied.

  2. Heavy Duty Ribbed Inserts 5 Star Review

    Posted by on 14th Feb 2018

    Exactly what I needed to replace feet on the kitchen chairs. Good price and prompt service. Nice that there wasn't a minimum spend.

  3. great product and service 5 Star Review

    Posted by on 3rd Jul 2015

    great product and service

  4. Selecting the right size insert is made easy 5 Star Review

    Posted by on 14th Feb 2015

    Having just received my order of Heavy Duty Ribbed Plastic Round Inserts I was able to immediately replace the worn out plastic feet of our kitchen chairs. The online guide to getting the right size made the selection so easy and they fit perfectly. Add prompt despatch + good price = perfect service!

  5. kitchen chairs refurb. 5 Star Review

    Posted by on 8th Jul 2014

    My mom's kitchen chairs plastic inserts had all worn through and were marking the tiled floor. She had used the inserts from the uprights for feet as a last resort and had replaced those with sherry corks. A quick search online & I found Castors Unlimited. , got enough inserts to replace to replace all 6 in each of 4 chairs plus some spares for less than the price of a pack of 10 at the local DIY superstore. The inserts look a lot more robust than the originals also. Good service all round.

  6. Plastic Round inserts 4 Star Review

    Posted by on 13th Mar 2014

    When I first ordered the plastic round inserts, I ordered the wrong size, I contacted Castors Unlimited and they exchanged them with no hassle. It was a great pleasure to do business with.
    if there are anyone out there looking to do business with CU I would recommend there with no worries.
    Many thanks

    Dave P

  7. Very Impressed 5 Star Review

    Posted by on 16th Jan 2014

    Happy New year and my apologies for taking so long to get back to you. With regards to both your service and the product that I ordered for the school, I would like to say I was very impressed with your assistance in getting the right item.
    No doubt I will be in contact with you as and when we need more items!
    Many thanks Ian Betts, Blessed William Howard Catholic High School.


Perfect fit for my needs. As a returning customer, I was more than happy and pleased with the service from Mr Rob Scott and his very helpful and professional staff. I having bad to negative to say about any of my purchases from Castors Unlimited, or the people I have had the pleasure, of speaking to and getting the knowledge, and insight to my needs. Just keep up the great job by doing what you do the best job for your customers. Anthony J Kimber
------------------------------------- Everything perfect thanks, quick delivery, great items that sorted my office chair problem and excellent communication. Top stuff. Kingsley.
------------------------------------- Great value - it's transformed a tired office chair and we can whizz around in it now !! Sandra.
------------------------------------- Good product, good price, quick delivery. Many thanks.
------------------------------------- Thanks for a fast simple transaction, the way it should be!
------------------------------------- I am very very happy with my purchase EXCELLENT SERVICE, pleasure to deal with. Matt
------------------------------------- Excellent service and product. Most certainly buy again! Recommended!! Jo.
------------------------------------- The castor was perfect for our needs, to replace a broken one and use an existing stem which couldn't be removed. So many castors nowadays come with a stem which can't be removed. Customer services and delivery were flawless. We'll use this company again, well done to them. Adriana Williams
------------------------------------- As a domestic customer, it was quite a work-up trying to find replacement domed inserts for our dining chairs. Like so much furniture these days, our chair were made in China. Great design, but trying to get replacement feet was proving a nightmare. After much searching on the web, thankfully we found 'castors unlimited'. They were very helpful. Cannot recommend highly enough. Oh, the product, Good quality,made in Britain. What more could we ask for! John.
------------------------------------- Small problem with packaging, (may have been caused by Royal Mail handling). Contacted Castors Unlimited, resolved, replacement missing part received and fitted all within 24 hours. Well done Natalie and team. These were for IKEA Markus chair, perfect fit and much smoother action. Mr Donovan
------------------------------------- I purchased M10 adjustable glides. The service and price where both excellant. Regards. John Pears Rollaco Presses.
------------------------------------- I just wanted to let you know I am really pleased with the product, price and speed of service from you. E-mail notifications were really good as well. I do a lot of purchasing for work and I'm used to companies not doing what they say they will so it was really nice to have an efficient service from yourselves. Keep up the good work! - Thanks a lot, Reece Gale
------------------------------------- Several companies seemed to be viable contenders to supply what I needed, but Castors Unlimited had by far the most impressive website. So I just measured my broken castor and filled in the online form - two days later my problem was solved. I actually bought two because I never know if anopther castor might collapse (the chair is about ten years old!) and they are so inexpensive that it seemed silly not to.
------------------------------------- At Ocean Life Aquatics we use Castors Unlimited to supply products as part of our bespoke aquarium installations. Their products are of excellent quality and competitively priced. Customer service is second to none, especially when we require items the next day! Mark Robinson - Proprietor - www.oceanlifeaquatics.net
------------------------------------- Your company is one of those bright spots in the life of a busy facilities manager. You stock everything that can be found on the end of a piece of furniture, and your service is helpful and speedy (and competitively priced). What’s not to like? Sue McFadyen - Estates Co-Ordinator - The Sixth Form College Solihull
------------------------------------- Happy New year and my apologies for taking so long to get back to you. With regards to both your service and the product that I ordered for the school, I would like to say I was very impressed with your assistance in getting the right item. No doubt I will be in contact with you as and when we need more items! Many thanks Ian Betts, Blessed William Howard Catholic High School.
------------------------------------- Castors Unlimited are certainly competitive, I have had a good Google around, but price isn't everything as service is very important too. Whilst one is able to see prices online there is little indication on how good the service may be. CU have proven on both counts so I have little intention of going anywhere else. Thank you for that. - Andy Young
------------------------------------- Many thanks again for your help and the amazing service. It has been a pleasurable experience – if only all online shipping could be this painless!! Kind regards. Graham Laird. 31.10.13
------------------------------------- The service provided in buying this product and the after sales service in rectifying one particular issue was brilliant. It was excellent customer service combined with very good delivery service. Now, I don't hear the scratch of the old wheels on the wood floor - smooth and silent! Posted By Stephen Coates 30/10/2013
------------------------------------- Fantastic company - Rated 5 out of 5 stars by reviewer Product: 50mm Twin Hard Wheel Swivel Castors & 36mm Tower with choice of Stem Feedback: From the minute I spoke with a young lady on sale I found 110 percent service and quality and fantastic value.. it was a joy to see 'old fashioned' values are still around well done castorsunlimited I wish you all a great future. Thank you, the products were perfect, great value and delivered at speed... regards Mike Ford
As a result of a broken castor on my office chair, I was told to speak to these people. Very helpful and knowledgeable staff, who helped me with the size and type of castor required, which can be tricky. Product delivered within a couple of days of order and my office chair is as good as new and at a fraction of the cost of buying a new one. Thanks!Posted By: Roger.
"wheelie" good casters by Martin (Southgate N14) on 22nd Jun 2013 Good quality replacements for my 'home' office chair at what I regard as modest prices. The advice received as to the exact product was spot on and delivery very prompt. Well done!
Just a quick note of thanks for your help and service given. I was so surprised this morning to have the order delivered, that must have been the fastest delivery I have known less than 24hrs from time of phoning you. Thank you once again. kind regards

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