Polyester Thread - Size 138
Polyester Thread - Size 138

Equivalent to Tex 135 (T-135) and Mil-Spec size FF

Size 138 (Tex 135) polyester thread is a middleweight thread that is sometimes used for heavier weight sewing because stitches are noticeable. Typical uses include auto upholstery and convertible tops, awnings, party tents, pool covers, tarpaulins, and sails. It requires a commercial machine and a size 20 to 22 needle as explained in our Buying Guide.


Buying Guide

Use and Size Guide

Buying Guide - PDF

Use and Size Guide - PDF



Click a color chip for
spool sizes, prices, and availability


Small Spools

2 and 4 Ounce spools for small jobs.

Half-Price Nylon & Poly

Unlabeled black and white for $12 a pound

Thread Boxes

Build a stash. Mixed nylon and poly in 5, 10, and 50 LB boxes.

Half-Price Bobbins

Styles A/15, G, L, M at $20 a gross. About 100 selections

Half-Price Cases

8 and 10 spool cases. About 20 selections

Related Products

Nylon Thread

Looks and sews like poly. Less sunlight resistant.

Waxed Thread

Large color selection in Sizes 207 through 554

100 Yard Polyester Tubes

Popular polyester sizes and colors on hand sewing tubes

100 Yard Nylon Tubes

Popular nylon sizes and colors on hand sewing tubes

Polyester-Linen Blend

Silky-smooth Irish polyester-linen blend.

The Thread Exchange 291A Merrimon Ave Weaverville, NC 28787 - 800-915-2320