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picatinny question

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Unread 01-13-2008, 12:55 PM
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Join Date: Oct 2007
Posts: 121
picatinny question

how picatinny scope bases work what's the trick, i know they are stronger than any other scope bases but still don't understand why the fluted on it.

one more question i want heavier screws on my bases and doing some research i find measures like 6-48x .210 and 8-40x .278 all of them are torx head screws and i don't knot what in the name of god is 6-48x i see my torx wrenches and they say t10, t15, t20, t25 and i don't see what's the relation.
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Unread 01-13-2008, 03:11 PM
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Join Date: Dec 2001
Location: Potters Hill, NC
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The "flutes" are designed in the mount to keep the rings from moving forward and backwards. The rings clamp down on the base via a long screw. The body of which goes in that "flute". Turn the rings over and look at 'em.
The "6" in 6-48 is the size of machine screw that it is. The smaller the # the smaller diameter the screw. The next # (48), is the number of threads per inch. So a 6-48 would be smaller diameter that a 8-40 and also have finer threads. Some think that a 8-40 is stronger than a 6-48. Don't know either way, but I have never had a 6-48 shear off. If the rifle kicks that much it should probably be mounted to the top of your truck instead!
As far as the Torx wrenches, the bigger the # the bigger screw head and a T10 is smaller than a T30...JohnnyK.
"The only thing necessay for the triumph of evil is for good men to do nothing."
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Unread 01-13-2008, 06:28 PM
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Join Date: Oct 2007
Posts: 121
thanks johnnyk you give me peace of mind i really appreciate your help, im planing to instal a picatinny on one of those new wincheter m70 not because the recoil is just because occasionally i drop or hit my rifle with someting and i don't want to losse my cero anymore since happened to my many times im opting for this bases now.
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Unread 01-21-2008, 11:03 AM
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Join Date: Aug 2006
Location: Hatchet City, AB,Canada
Posts: 232
Near Manufacturing

This might answer your question as to weather you need 6-48 or 8-40 screws...
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Unread 01-21-2008, 11:30 AM
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Join Date: Dec 2001
Location: Long Island, New York
Posts: 2,499
Related question:

What is the difference between a Weaver base (or Weaver type base) and a picatinny base?

Are the rings for these bases interchangeable?

I have 2 sets og Nightforce tapered bases. Are they Weaver, Picatinny or something else? I've got Leupold QRW rings on them at the moment, for whatever that's worth.
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Unread 01-23-2008, 09:48 PM
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Join Date: May 2007
Location: Alabama
Posts: 157
Varmit Hunter the only difference between the to styles of rings is the width of the cross bolt that fits in the slots in the base. The picatinny style cross bolts are a little wider than the weaver. Most bases made now have cross slots wide enough to accept either one. The cross bolt acts a recoil lug so the rings will not slide on the base. The nightforce bases are picatinny style so they will accept either style.
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Unread 01-30-2008, 01:00 AM
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Join Date: Jan 2007
Location: South Dakota
Posts: 753
To go along with all this one thing is important to remember with these type of scope rings and bases.

When/if installing these components pay attention when attaching the rings to the base or rail.

Leave the rings slightly loose and push FORWARD so that the front side of the screw is contacting the BACKSIDE of the "lug" surface machined into the rail.

This helps to prevent shift during recoil.

Good luck.
Chad Dixon
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