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Joined: Dec 2011
Posts: 422
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OP
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Joined: Dec 2011
Posts: 422 |
I lost two of the four screws for my Leupold two piece scope bases machined for a round receiver Sako L579. They are #6-40 narrow fillister hex socket screws with a head diameter of 0.195".
Anywhere besides Brownells that I could check for these screws? Their computer still thinks it's Sunday and won't give me a confirmation number after insisting that I change my password.
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Joined: Feb 2006
Posts: 1,658 Likes: 1
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Campfire Regular
Joined: Feb 2006
Posts: 1,658 Likes: 1 |
Maybe Leupold will have mercy on you. 6x40 = uncommon - fillister = uncommon
I checked
MCMASTER Jantz Grainger Travers MSC Bolt Depot Marshall
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Joined: Aug 2010
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Campfire Regular
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Campfire Regular
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Are you sure they are 6-40? 8-40 and 6-48 are common sizes. If they are 6-48 you can chuck the shank in a drill and file/grind/sand the head down to size. I have a piece of 1/8" flat bar with numerous 6-48 and 8-40 holes drilled and tapped in it that I use to grind screws down to custom lengths.
PA Bear Hunter, NRA Benefactor Member
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Joined: Jan 2003
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Campfire Tracker
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Campfire Tracker
Joined: Jan 2003
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My H&R was a Sako round top. It took 6-48's. My Browning Safari was a round top Sako L579 and it was also 6-48.
Yours may well be 6-40's. Check them with a thread pitch gauge or a Hillman female thread block. -Al
Forbidden Zoner
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Joined: Aug 2010
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Aug 2010
Posts: 48,113 Likes: 12 |
If they are a 6-40 screw, you should be able to find those at your local hardware store. In town, I have 3 places that I can find these screws. If they need to be even more "custom", as in fit inside the pocket of the base, I can easily file them down and reblue, grind to length or whatever. Shouldn't be a very hard venture.
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style. You want to see an animal drop right now? Shoot him in the ear hole. BSA MAGA
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Joined: Dec 2011
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Campfire Member
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OP
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Joined: Dec 2011
Posts: 422 |
Thanks. They aren't #6-40s since I hand-turned a known #6-48 into the receiver. I had measured the shank length on one I didn't lose and counted the threads with a pin and came up with 40 TPI. Clearly not a precise method. I have a thread gauge on the way as well.
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Joined: Dec 2011
Posts: 422
Campfire Member
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OP
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Posts: 422 |
I've got the #6-48 screws from Brownells (they were great about not charging additional postage on them and sent me a prepaid return label for the #6-40s!). When I grind them to length, should the threads go the full threaded depth of the receiver bridge? The screws that came with the bases originally (two of which I lost, which occasioned this post) only go about halfway into the bridge (bridge thickness is about 0.340"; original screw threaded length into bridge is about 0.172").
I thought if I ground the new ones flush with the receiver inner diameter there would at least be less space (a really tiny amount, admittedly) for dirt to collect.
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Joined: Jan 2003
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Campfire Tracker
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On blind holes, I allow for 1/2 turn of clearance before bottoming out. On through holes, I like all the thread length possible...but not into the bolt raceway. A bit of light oil on threads.
Forbidden Zoner
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