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Old 02-25-2014, 09:03 PM   #1
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Rubber "o" rings on self tapping screws

Hello all. Just got three sets of BAL lock-arm stabilizing bars and looking at the hardware, there is a rubber "o" ring on the self tapping screws, do the rubber rings replace the need for lock washers? How secure is the rubber compared to lock washers? thanks.
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Old 02-27-2014, 09:41 PM   #2
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Has anyone ever used rubber gaskets on self tapping screws instead of a lock washer? Never seen something like that before. Thanks.
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Old 02-27-2014, 09:50 PM   #3
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Has anyone ever used rubber gaskets on self tapping screws instead of a lock washer? Never seen something like that before. Thanks.
I would say that rubber "O" rings serve one purpose and lock washers serve another. So No to using "O" rings in place of lock washers.
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Old 02-27-2014, 10:22 PM   #4
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A pic would help, but I'd guess they just used building style screws with a bonded sealing washer. They just seal the penetration

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Old 02-27-2014, 10:30 PM   #5
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A pic would help, but I'd guess they just used building style screws with a bonded sealing washer. They just seal the penetration

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Old 02-27-2014, 10:38 PM   #6
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I'm assuming your referring to a self-drilling screw, not self tapping/thread cutting screw? Self-drilling screws do not use a lock washer. A bond sealing washer seals the hole but doesn't lock anything.
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Old 02-27-2014, 11:11 PM   #7
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A pic would help, but I'd guess they just used building style screws with a bonded sealing washer. They just seal the penetration

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That does help, will try and get a picture after it stops raining in SoCal. Give a couple of days. Thanks.
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Old 02-27-2014, 11:14 PM   #8
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I'm assuming your referring to a self-drilling screw, not self tapping/thread cutting screw? Self-drilling screws do not use a lock washer. A bond sealing washer seals the hole but doesn't lock anything.
Yes, I guess my terminology is off, my apologies. It would be self drilling screw with what I gather now is simply a sealing rubber o ring. Thanks.
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Old 02-27-2014, 11:15 PM   #9
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I would say that rubber "O" rings serve one purpose and lock washers serve another. So No to using "O" rings in place of lock washers.
Gotcha, thanks. Will post pic ASAP.
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Old 02-27-2014, 11:47 PM   #10
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Yes, I guess my terminology is off, my apologies. It would be self drilling screw with what I gather now is simply a sealing rubber o ring. Thanks.
Sealing a drilled hole that has a bolt or similar fastener though it to prevent leakage (fluid or air) is the primary use of rubber "O" rings,although I have seen applications where they are also used to prevent or dampen vibration in some aircraft.

They are also used in many hydraulic and air quick disconnect fittings.
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