RMweb Premium Trainshed Terry Posted March 30, 2020 RMweb Premium Share Posted March 30, 2020 (edited) Hello People. I am looking to get some replacement “O” rings for my two air brushes that I have, but I am struggling to find any on the internet to match the size requirements that needed. The outside diameter needs to be 9.5 mm The internal diameter needs to be 9.5 mm With a thickness of around 0.5 mm. The “O” ring fits in between the head cap and the main body of the airbrush. (See Image). I did purchase some “O” rings but they have turned out to be too thick at around 1.0 mm which affects the performance of the air brush to the point they make the air brush unusable. The air brushes where not expensive as I cannot afford a Iwata or other makes as I have a limited income per month. Now the weather is getting warmer I can start to do some airbrushing on projects that I have had to put on hold. Any Advise as to where I can get the aforementioned “O” rings would be of great help, so that I can get back some modelling mojo. Thank You. Edited March 30, 2020 by Trainshed Terry Image Edit Link to post Share on other sites More sharing options...
Pete the Elaner Posted March 30, 2020 Share Posted March 30, 2020 49 minutes ago, Trainshed Terry said: The outside diameter needs to be 9.5 mm The internal diameter needs to be 9.5 mm With a thickness of around 0.5 mm. The air brushes where not expensive as I cannot afford a Iwata or other makes as I have a limited income per month. Either your measurements are not consistent with each other or I mis-understand. How can both internal & external diameter be the same? Unfortunately buying a more expensive airbrush is just as much about the after sales support & availability of spares than it is about performance from new. Link to post Share on other sites More sharing options...
RMweb Gold ianLMS Posted March 30, 2020 RMweb Gold Share Posted March 30, 2020 I can't be sure, but wouldn't PTFE tape, wrapped around the thread and where the o-ring goes do a temporary job until the proper O rings can be sourced? 2 Link to post Share on other sites More sharing options...
RMweb Premium Trainshed Terry Posted March 30, 2020 Author RMweb Premium Share Posted March 30, 2020 20 minutes ago, Pete the Elaner said: Either your measurements are not consistent with each other or I mis-understand. How can both internal & external diameter be the same? Unfortunately buying a more expensive airbrush is just as much about the after sales support & availability of spares than it is about performance from new. I have just uploaded a better image of where the "O" goes, there is a groove where the "O" is located to seal the head cup to the main boydy of the air brush. I have remeasured and the thread is 10 mm, and I am guessing the depth of the slot is about 0.5 mm, but not having the right tool for the job it is a estimated measurement. Link to post Share on other sites More sharing options...
RMweb Premium John Isherwood Posted March 30, 2020 RMweb Premium Share Posted March 30, 2020 1 hour ago, Trainshed Terry said: Hello People. I am looking to get some replacement “O” rings for my two air brushes that I have, but I am struggling to find any on the internet to match the size requirements that needed. The outside diameter needs to be 9.5 mm The internal diameter needs to be 9.5 mm With a thickness of around 0.5 mm. The “O” ring fits in between the head cap and the main body of the airbrush. (See Image). I did purchase some “O” rings but they have turned out to be too thick at around 1.0 mm which affects the performance of the air brush to the point they make the air brush unusable. The air brushes where not expensive as I cannot afford a Iwata or other makes as I have a limited income per month. Now the weather is getting warmer I can start to do some airbrushing on projects that I have had to put on hold. Any Advise as to where I can get the aforementioned “O” rings would be of great help, so that I can get back some modelling mojo. Thank You. After you fitted the 1mm. thickness O ring, did you adjust the needle position in order to ensure that it is fully forward in the nozzle when released? John Isherwood. Link to post Share on other sites More sharing options...
Quarryscapes Posted March 30, 2020 Share Posted March 30, 2020 They are available cheaply from China on eBay, but you may have to be flexible on exact size - for example this listing has 9 and 11mm ID in 0.5mm Cross Section, but not 10mm... https://www.ebay.co.uk/itm/Metric-Nitrile-Rubber-O-Rings-0-3-0-8mm-Cross-Section-0-5-20mm-ID-Pack-of-10-100/223060966221?hash=item33ef783b4d:m:mB7Xl9fowK2Qum7QN2p7q5w Link to post Share on other sites More sharing options...
davegreenly Posted March 30, 2020 Share Posted March 30, 2020 Amazon currently have packs of 15 different size o rings for less than £7. I;m sure manufacturers would use standard sizes so you would be unlucky if none fitted. Link to post Share on other sites More sharing options...
cypherman Posted March 30, 2020 Share Posted March 30, 2020 Hi. I bought a whole box of o rings sold in a set by the company toolbox from my local hardware shop. It contained over 260 different rings. Link to post Share on other sites More sharing options...
crompton 33 Posted March 30, 2020 Share Posted March 30, 2020 (edited) Hi there are some Airbrushes very cheap on here . Might be just as easy to get a new one. What type on paint have you used if it's Enamel paint . This will rot the O rings .This type of Airbrush is for water based paint only. You may need to waite awhile . http://airbrush-pro.co.uk/contents/en-uk/d27.html Edited March 30, 2020 by crompton 33 1 Link to post Share on other sites More sharing options...
roythebus Posted March 30, 2020 Share Posted March 30, 2020 I've got 2 huge boxes of O rings in my bus workshop, I'll see if there's any that small. i sometimes use them in bus air brake parts. 1 Link to post Share on other sites More sharing options...
RMweb Premium Trainshed Terry Posted March 30, 2020 Author RMweb Premium Share Posted March 30, 2020 1 hour ago, crompton 33 said: Hi there are some Airbrushes very cheap on here . Might be just as easy to get a new one. What type on paint have you used if it's Enamel paint . This will rot the O rings .This type of Airbrush is for water based paint only. You may need to waite awhile . http://airbrush-pro.co.uk/contents/en-uk/d27.html I use Vallejo Model Air acrylic paints for my military modelling. As I find hard to get the consistency for enamel paints right. Any way I have to wait for fine days to use the air brush as I don't have a man cave, My living room doubles for my modeling room. Thank you for you help. Link to post Share on other sites More sharing options...
Trainshed Posted March 31, 2020 Share Posted March 31, 2020 Hi, as ianLMS said, a single turn of thin PTFE thread seal tape (from Amazon, B+Q, Screwfix, plumbers merchant etc) would do the job of the "O" ring, which is just to seal the join between the two pieces of the airbrush. 2 Link to post Share on other sites More sharing options...
RMweb Gold Joseph_Pestell Posted March 31, 2020 RMweb Gold Share Posted March 31, 2020 Quite amazing how many sizes and types of O rings there are. If you can't find the right one in a "commercial" box, there is a really helpful company in Chichester that specialises in O rings. Enabled me to make a cheap repair (£10) of my bottle foiler when I was being quoted £hundreds. Link to post Share on other sites More sharing options...
tom q vaxy Posted March 31, 2020 Share Posted March 31, 2020 beeswax on the male threads 1 Link to post Share on other sites More sharing options...
John Tomlinson Posted April 1, 2020 Share Posted April 1, 2020 On 31/03/2020 at 10:40, Trainshed said: Hi, as ianLMS said, a single turn of thin PTFE thread seal tape (from Amazon, B+Q, Screwfix, plumbers merchant etc) would do the job of the "O" ring, which is just to seal the join between the two pieces of the airbrush. I've long wondered if this worked, but haven't needed to try as I've managed to get ring seals. Thanks to you and IanLMS for the confirmation. John. Link to post Share on other sites More sharing options...
RMweb Premium Trainshed Terry Posted April 1, 2020 Author RMweb Premium Share Posted April 1, 2020 On 30/03/2020 at 16:30, Quarryscapes said: They are available cheaply from China on eBay, but you may have to be flexible on exact size - for example this listing has 9 and 11mm ID in 0.5mm Cross Section, but not 10mm... https://www.ebay.co.uk/itm/Metric-Nitrile-Rubber-O-Rings-0-3-0-8mm-Cross-Section-0-5-20mm-ID-Pack-of-10-100/223060966221?hash=item33ef783b4d:m:mB7Xl9fowK2Qum7QN2p7q5w I have order some seals from this vendor and they should be here by the 20th, if the posties arev working as I have not seen a post person. Terry 1 Link to post Share on other sites More sharing options...
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