double-threaded
adj1
Engineering, Natural sciences, Physical sciences Consisting of two threads twisted together; using two threads.
- double-threaded worm
2
Engineering, Natural sciences, Physical sciences Having two screw threads instead of one; said of a screw in which the pitch is equal to twice the distance between the centers of adjacent threads.
- A multiple-threaded product is one having two or more threads cut beside each other (imagine two or more strings wound side by side around a pencil). Standardized products such as screws, bolts, and nuts all have single threads; a double-threaded screw has a lead equal to twice the pitch, a triple-threaded screw has a lead equal to 3 times the pitch, and so on.2021, Richard G. Budynas and J. Keith Nisbett, “Screws, Fasteners, and the Design of Nonpermanent Joints”, in Shigley's Mechanical Engineering Design, eleventh edition in SI units, page 423: