• Webster's Revised Unabridged Dictionary
    • Double-threaded Consisting of two threads twisted together; using two threads.
    • Double-threaded (Mech) 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.
    • ***
Century Dictionary and Cyclopedia
    • double-threaded Having or sewing with two threads, as a sewing-machine having both needle and shuttle.
    • double-threaded Having two screw-threads which start at points 180 degrees apart and have each twice the pitch which appears from measuring from the tip of one thread to the tip of the next parallel to the axis. Double-threaded screws give very rapid motion to the nut.
    • ***


In literature:

Emmeline this morning had just finished restringing them on a double thread.
"The Blue Lagoon" by H. de Vere Stacpoole
Thread, sewing a double, 1904.
"Handy Dictionary of Poetical Quotations" by Various
In the case of fabrics with doubled and single threads, the doubled threads are always found in the warp.
"Textiles" by William H. Dooley
The veil is quite broad, and it is double, that is, it consists of two layers which are loosely joined by threads.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc." by George Francis Atkinson
Border of doubled threads of dark blue and orange.
"How to make rugs" by Candace Wheeler
Panels A, B, C, in the sampler, Illustration 56, are couched in double threads, D in single cords.
"Art in Needlework" by Lewis F. Day
Thread the trussing needle with white twine, using it double.
"Scouting For Girls, Official Handbook of the Girl Scouts" by Girl Scouts
Here each doubled thread extends downwards and passes through a "traveller" upon the bobbin.
"The Story of the Cotton Plant" by Frederick Wilkinson
She was tired of that long needle and its long needleful of double thread.
"Opportunities" by Susan Warner
Slight and frail is the thread, yet it has a double strand.
"Old and New London" by Walter Thornbury

In news:

Options include double-thread chain stitch, presser foot lifter, shoulder belt, thread cone cover, tape binding attachment.
The Utilis Multidec 3000 series double- sided turning inserts are said to provide long life and repeatability to 0 0004 for cutoff, front and back turn, groove and turn and threading work.