This specification also covers SAE J356 Type -A tubing. The mechanical properties and performance requirements of standard SAE J356 and SAE J356 Type-A are the same. Therefore, the designated differences of Type-A tubing are not meant to imply that Type-A tubing is in anyway inferior to standard SAE J356. The Type-A designation is only meant to address the unique manufacturing differences of the small diameter, light wall sizes (typically 15.88 mm OD X 1.24 mm wall and smaller.) The primary differences between SAE J356 and SAE J356 Type-A are described in the following paragraph.
Type-A tubing is heat treated in-line to relieve stresses and is generally produced in coiled form. When Type-A tubing is produced in coil form, straight lengths of Type-A are only available through a secondary straightening and cut-to-length operation. Standard SAE J356 is produced as straight lengths and then receives a secondary normalizing operation. All standard SAE J356 requirements apply to Type-A tubing unless the specific requirement is noted with a "Type-A" designation. Standard SAE J356 is also available in the same sizes as Type-A, in which case all the standard SAE J356 specifications apply.