LDS Vacuum NW40-150-LF Long Butt Flange

What is NW40-150-LF

• The designation NW40 (also known as KF40, QF40, ISO-KF, etc.) refers to a standard vacuum flange / coupling size. The “40” corresponds to a flange outer diameter of ~2.18 inches (≈ 55.4 mm).

• The “150” in “NW40‐150‐LF” indicates a tube or bore size of 1.50″ (i.e. the internal diameter of the tubing that mates to this flange).

• “LF” stands for Long Flange (sometimes “Long Butt Flange” or “Long Flange / Long Butt”) — meaning this is a flange with an extended “butt” section, essentially a half-nipple or stub length to facilitate welding, joining, or insertion.

• The part is made from 304 stainless steel (standard vacuum hardware material) in the flange version.

• Some dimensional details given by LDS Vacuum for NW40-150-LF:
    • A (tube inside length): 1.50″
    • B (flange thickness): 0.07″
    • C (overall length): 1.58″