TmxDiver Posted September 22 Posted September 22 I'm trying to buy, in the US, new O-Rings for my Retra Pro X strobes. The Retra website has them for sale but shipping is something like $32 to the US which is crazy given the cost of the o-rings themselves. The Retra website says "you can buy them at your local o-ring store" (40 x 2.5mm EPDM 70) but I'm a bit wary of doing that and when I checked www.theoringstore.com, the minimum buy quantity (believe it or not), it was 273. I don't need 273 of them. 🙂 Backscatter only seems to have o-rings for the first gen strobe (or my searches are just ineffective). I can't believe that it should be this hard to get o-rings. Any ideas? Thanks, - brett 1
mcgowman Posted September 22 Posted September 22 Check Ebay. Sellers there are more likely to sell in smaller quantities. Searching is a bit overwhelming at first, but some sellers let you pick the size/diameter desired.
TmxDiver Posted September 22 Author Posted September 22 42 minutes ago, mcgowman said: Check Ebay. Sellers there are more likely to sell in smaller quantities. Searching is a bit overwhelming at first, but some sellers let you pick the size/diameter desired. Thanks. I'm a bit leery ordering o-rings off EBay, especially with two expensive strobes at risk. I found another o-ring store, but it lists the dimensions of a "040 x 2.5mm" o-ring as "4mm ID x 45mm OD x 2.5mm C/S" and I just want to make sure that is the correct o-ring. It seems very strange that the actual dimensions don't match. I guess the "40" refers to the ID while the 45mm OD is the sum of the ID + the 2 x 2.5mm measurements. Confusing at best. It is hard to believe that US Retra dealers don't just stock the Retra o-rings. Maybe my search kung-fu is just really limited. - brett
Jay-11 Posted September 22 Posted September 22 On Monday I would call Backscatter direct as they may have them but not listed yet. Another option would be Reef Photo.
TmxDiver Posted September 22 Author Posted September 22 1 hour ago, Jay-11 said: On Monday I would call Backscatter direct as they may have them but not listed yet. Another option would be Reef Photo. Yep. I sent an email to Backscatter but will call them in the AM. Thanks, - brett
Kraken de Mabini Posted September 23 Posted September 23 I just now looked up the O-Ring Store with Google and the price is $0.17 per 2.5 x 4O ring, an acceptable price. https://www.theoringstore.com/store/index.php?main_page=product_info&products_id=2032 You might want to use another search engine, or give more practice to your O-ring searches, your search Kung-Fu as you call it.
Oskar - Retra UWT Posted September 23 Posted September 23 Hi, regarding the dimensions: All dimensions on our website are in millimeters and follow this format: (internal diameter of the O-ring) X (thickness of the O-ring). The material of the O-ring should always be "EPDM 70". If you can't find any suitable O-rings locally please write to us: help@retra-uwt.com
TmxDiver Posted September 23 Author Posted September 23 15 hours ago, Kraken de Mabini said: I just now looked up the O-Ring Store with Google and the price is $0.17 per 2.5 x 4O ring, an acceptable price. https://www.theoringstore.com/store/index.php?main_page=product_info&products_id=2032 You might want to use another search engine, or give more practice to your O-ring searches, your search Kung-Fu as you call it. Thanks! Very strange. That is the exact place I checked over the weekend and, at that time, the minimum quantity was 273 and now it looks like it is twenty. Odd. In the meantime, I had found another on-line store that had lower minimum quantities so I bought them. Thanks, - brett 3 hours ago, Oskar - Retra UWT said: Hi, regarding the dimensions: All dimensions on our website are in millimeters and follow this format: (internal diameter of the O-ring) X (thickness of the O-ring). The material of the O-ring should always be "EPDM 70". If you can't find any suitable O-rings locally please write to us: help@retra-uwt.com Thanks, Oskar! - brett
TmxDiver Posted September 23 Author Posted September 23 15 hours ago, Kraken de Mabini said: I just now looked up the O-Ring Store with Google and the price is $0.17 per 2.5 x 4O ring, an acceptable price. https://www.theoringstore.com/store/index.php?main_page=product_info&products_id=2032 You might want to use another search engine, or give more practice to your O-ring searches, your search Kung-Fu as you call it. I figured out the difference. Retra recommends EPDM 70 O-Rings (not Buna-N 70 Duro) and I'm not even sure what the difference is? When you look up the EPDM 70 version of the O-Rings on the website, the minimum buy quantity is 273: https://www.theoringstore.com/store/index.php?main_page=product_info&cPath=368_2278_2284&products_id=46227 Again, I don't know the technical difference between EPDM 70 and Buna-N 70, but if Retra says EPDM, then I'm going to do my best to buy that kind. IMHO, it would be much, much easier and foolproof to just have a place in the US that sold the Retra O-Ring kits. Regards, - brett
bvanant Posted September 23 Posted September 23 EPDM is a bit more resistant to sunlight and ozone than is Buna. Otherwise in terms of mechanical properties (compression set, and durometer they are nearly identical and a very large fraction of your scuba o-rings are likely Buna-N. Call the O-ring guys and tell them you need only 10 of epdm that has worked for me Bill 1
TmxDiver Posted September 26 Author Posted September 26 As a quick follow-up, Backscatter does stock them, they just don't appear to be on their website. For reference, the part number they use is "rt-pro-o-ring Retra Spare O-ring for the Pro / Prime Strobe - EPDM70 Ø40x2,5mm" Regards, - brett 1
SwiftFF5 Posted September 26 Posted September 26 I am not sure from your specs if the 40 mm is the ID or the OD, but here's a source as well: https://www.mcmaster.com/products/o-rings/system-of-measurement~metric/cross-section-shape~round/id~40-000-mm/material~viton-fluoroelastomer/?s=o-ring+40+x+2.5mm+epdm+70
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