Size 138 is a heavy-middleweight thread typically used for sewing leather, heavy upholstery fabric, drapes, canvass, seat belts, auto interiors, awnings, boat covers, pool covers, banners, flags, patio furniture, sails and tents. 

All of these threads are BONDED THREAD (NYLON OR POLY)

RECOMMENDED NEEDLE SIZE 20 OR 22

Also known as Tex 135 and Government Size FF 

Approx. 22 lb. (10.0 kilo) tensile strength

Approx. 0.0163 in. (0.4140 mm) diameter

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