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Air Gun Home Forum Index » Pistols » Metric 2240 Goto page 1, 2  Next    View previous topic :: View next topic  Metric 2240   Posted: Tue May 26, 2009 2:08 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA The head broke off that little 4-48 X .25 screw that holds the breech down: Of course, my hardware store doesn't have 4-48 screws, but I found out a M4-.5 screw will fit. The M4 is a few thousandths larger in diameter, and .5mm/turn works out to be 50.8 turns per inch. It goes in with just a little drag, and doesn't wreck the threads. In fact, there was just enough drag that I didn't feel Loctite was necessary. I turned down the head diameter of a socket flathead screw, and cut it to length. Just thought you might like to know. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Tue Nov 17, 2009 7:22 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC I think you mean a 3mm metric, not 4mm.... the 0.5mm pitch is right, though.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Tue Nov 17, 2009 7:52 pm Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND I destroyed the screw on my 2240 taking it out so I replaced it with a UK 6BA screw no problems. Al _________________   Posted: Tue Nov 17, 2009 8:01 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Quote: I think you mean a 3mm metric, not 4mm.... the 0.5mm pitch is right, though.... It's entirely possible that it was a 3mm screw that got dropped in the 4mm bin. Now I'll have to go check and see what I actually got. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Tue Nov 17, 2009 8:59 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC # 4 - 48 screw OD = 0.112" 3mm = 0.118" 4mm = 0.158" Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Tue Nov 17, 2009 9:14 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA I stand corrected. It had to have been a 3MX0.5 screw. Here are the 3M, 4-48, and 6BA side by side: Taken from: http://www.minibearings.com.au/catalogue/charts/Thread_Pitch.pdf _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Wed Nov 18, 2009 4:13 am broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands Alstone wrote: I destroyed the screw on my 2240 taking it out so I replaced it with a UK 6BA screw no problems. Al Been there, done that... Sort of. Those screws are notorious. _________________ BIG GAP   Posted: Wed Nov 18, 2009 5:21 am Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND I reckon Bobs right I have just tried all three and the 4-48 UNF (2.845mm) fit’s the best, the 6ba is a bit loose and the 3mm tight. Another thing while were on about sizes. What standard is a 2240 made to English, American or metric? As Americans say the gas tube is 7/8” dia and the barrel 7/16”, but I find them 22mm and 11mm respectably? Plus what standard does Canada work to? Al _________________   Posted: Wed Nov 18, 2009 1:50 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC Crosman work to American sizes.... the tube is the standard for DOM tubing.... 7/8" OD with a 0.065" wall nominal size.... The barrel is probably slightly undersize so it will fit in a 7/16" drilled hole.... Canada is officially on the Metric system.... except for us old farts who insist on using the system we learned in school.... .... However, because of the American influence, both systems are common here.... for instance all pipe sizes are NPT.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Wed Nov 18, 2009 2:25 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Quote: Canada is officially on the Metric system.... except for us old farts who insist on using the system we learned in school We're going to convert real soon - I have a shop manual for a 1978 Chevrolet that says so. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Wed Nov 18, 2009 3:35 pm Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND We changed to the metric system in the early seventys, but considering we had BS Whitworth, BS Fine, Gas, BA and Model engineers threads, plus American Corse and Fine which we used on bicycles and CB radios, so being a war baby I just use the lot and can tell nearly any standard thread up to 1/2"/12mm just by looking at it, my party piece. Al _________________   Posted: Thu Nov 19, 2009 12:36 am kanyon Silver Status Member Joined: 09 Aug 2008 Posts: 1582 Location: New Zealand Silly little screw to hold the breach down anyway.... Asking for trouble with a 24" barrel... I just omited it completely.... Pete   Posted: Thu Jan 07, 2010 3:14 pm packrat Senior Member Joined: 16 Nov 2009 Posts: 882 Location: Out in the woods...Ellabell, GA. There really should be a Congressional sub-committee investigation to find out what MORON decided to use that screw in the first place ..it's ridiculous _________________ HEY !! This getting old thing is NOT for sissies...   Posted: Tue Apr 06, 2010 10:13 am ausher Member Joined: 28 Feb 2010 Posts: 96 Location: SWMO U.S.A. You mean we don't gotta use that screw??? _________________ so far a stock 2240 and a 2300kt with a 14.6" barrel, walnut grips, with mods from www.mountainaircustomairguns.com - power adjuster, modified valve, and an extended bolt probe. optical- leapers 30mm tactical dot sight   Posted: Tue Apr 06, 2010 11:06 am AirGunEric Site Admin Joined: 20 Jan 2007 Posts: 6930 Location: "Out There" ausher wrote: You mean we don't gotta use that screw??? Where'd that come from? Yes, you need the screw to hold the breech to the tube! _________________ ` I'd say "I care." But I'd be lying. Canadian Airgun Supplier: http://www.scopesandammo.com/storefront Metric 2240     Air Gun Home Forum Index » Pistols You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum All times are GMT - 5 Hours   Page 1 of 2   Goto page 1, 2  Next All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First  Select a forum Main Forums----------------AirGunHome Q&AGeneral Air Gun Questions and TopicsPicture GalleryTarget Shooting: Casual, Fun and CompetitionHunting, Pest Control, Varminting People/Events/Airgun Issue Discussion----------------Introduce YourselfThe BS TopicClubs/Events/Regional/Political Airgun Issues Maintenance, Modification and Reviews----------------RiflesPistolsAntique, Collector and Novelty AirgunsBB GunsPellets/AmmoOpticsAccessoriesAirgun Smithing Buy, Sell or Trade Forums----------------For SaleWant to Buy   Note: If you are seeing "Please enter your username and password to log in." 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