HALF AN INCH ACTUAL SIZE PLUS

At that point pipes begin to be sized by outside diameter instead of inside diameter: every inch from 14 to 20 inches OD, then every other inch to 30 inches OD. The standard also defines larger pipes: every whole inch to 12 inches.

HALF AN INCH ACTUAL SIZE PLUS

A tolerance of plus or minus one turn is allowed, and in practice threads are often routinely cut shorter than the standard specifies.Īll dimensions are in inches. The table shows the distances and number of turns called for in the standard. For workers, instead of these distances, it is more convenient to know how many turns to make by hand and how many with a wrench.

It also specifies another distance, the engagement, the distance the pipe can be screwed in by hand, without much effort. The standard specifies this distance, the effective thread. The taper is ¹⁄₁₆ inch in an inch, which is the same as ¾ inch in a foot.īecause of the taper, a pipe can only screw into a fitting a certain distance before it jams, unlike threading a nut on a bolt. The bottoms of the threads aren't on a cylinder, but a cone they taper. To accomplish this, the threads become shallower the farther they are from the end of the pipe or fitting. Many pipe threads must make not only a mechanical joint but also a leakproof one. The word “taper” in several of these names points to the big difference between many pipe threads and those on bolts and screws. In the United States, the pipe thread standards are: NPTĪmerican Standard Straight Coupling Pipe ThreadĪmerican Standard Taper Railing Pipe ThreadĪmerican Standard Straight Mechanical Pipe ThreadĪmerican Standard Straight Locknut Pipe Thread Halfway in between each 1/2 inch line, there will be a smaller line that denotes a 1/4 of an inch.

If the pencil point ends at the shorter line halfway between the 4 and 5 inches marks, then your pencil is 4 and 1/2 inches long. If “LH” is added, the pipe has a left hand thread. Mark where the tip of the pencil lead ends on the ruler. For example, “½–14 NPT” identifies a pipe thread with a nominal inside diameter of ½ inch and 14 threads to the inch, made according to the NPT standard. Convert Centimeter or Millimeter to Inches convert millimeter to inches, centimeter to inches, inches to centimeter or millimeter, include convert decimal inch to fractional inch (for example 1.45' 1 7/16'). Pipe thread sizes are described much as bolt sizes are, although the shapes are different. ☙ Share this page on Facebook American pipe threads

Half an inch actual size