ASTM D6193

Also Known As: Federal Standard 751a

technical standard specifying stitches and seams

Compare ISO 4916.

Organization

Seams are divided into classes and types. Classes are coded with two uppercase letters. Types are coded with one or more lowercase letters after. Digit suffixes often denote the number of rows of stitches. So LSa-1 is a type “a” lapped seam with one row of stitching, while LSa-2 is a type “a” lapped seam with two rows.

SS superimposed seams
LS lapped seams
BS bound seams
FS flat seams
EF edge seams
OS ornamental seams

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