NCCER Instrumentation Certification Practice Test

Question: 1 / 400

Fittings that are marked LH on the outside wall indicate what type of threads?

right-hand threads

soft threads

lefthand threads

Fittings marked with "LH" on the outside wall indicate left-hand threads. This designation is crucial in applications where different thread types are used to prevent the assembly of incompatible components. Left-hand threads are designed to tighten counterclockwise, which is the opposite of standard right-hand threads that tighten clockwise.

The use of left-hand threads is commonly found in specific applications, such as gas fittings or specialized mechanical equipment, where it's necessary to differentiate from standard right-hand threads to avoid accidental cross-threading or loosening during operation. Recognizing the designation and the corresponding direction for tightening is key for ensuring proper assembly and safety in the installation process.

Get further explanation with Examzify DeepDiveBeta

specialized threads

Next Question

Report this question

Download NCCER Instrumentation Certification Practice Test PDF Study Guide
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy