Conduit Lock Nut Question

[Roy]

Curious as to how everyone installs the conduit lock nut on their mufflers or pipe screwed in the block for the muffler. The lock nuts are concave with one smooth/rounded side while the other side is jagged from the lugs sticking up. If the smooth side is faced toward the engine block the lugs are easier to tighten and you still have a jam net effect. If the lugs are faced toward the block they will dig into the block thus sort of locking the nut on the pipe/muffler. Have seen them installed both ways. Above leads to a couple of questions: How does everyone install the lock nuts? What is the correct installation method? Thanks,

[D-17_Dave]

Lugs towards the block. Reason is the amount of surface contact between the block, the nut, and the treads.

[MPH]

I install mine with the lugs to the block. Same way sparkies use them on conduit.

[Cvans]

I also install with the lugs toward the block. I always did it this way with conduit. You know what they say about old habbits being hard to break.dOd Chris

[Willy]

I install mine with lug to the block,to tighten I use a drift punch and hammer.

[comet66]

quote:

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Originally posted by Willy
I install mine with lug to the block,to tighten I use a drift punch and hammer.

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The lugs/teeth against the block provide the lock.

[AC_B-1Novice]

I agree with John...lugs provide the lock.