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  • cutting fluids

    what works best for cutting threads on 4140 stainless steel and 4140 chrome moly. I'm using relton rapid tap now on the gun barrels now.

  • #2
    For regular threading I use "Cool Tool" (monroe chemical?). For harder to thread materials I use "Trim Tap Heavy". This stuff is pretty thick and sticks to the part while turning. It also wipes off suprisingly easy.

    Hope this helps,
    Frank

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