Sewing thread for sail making

Sewing thread is selected for the strength requirement of a particular part of the sail and must be compatible with the sail making sewing machine (http://www.cowboysew.com/heavy-zigzag-sail-making-sewing-machines.htm). Generally in all goes together: heavy-stress sail, big machine (like Cowboy #9366-31HA long arm extra have duty zigzag lockstitch sail making machine), heavy threads.

Polyester thread #30 Needle size (Metric/Singer): #80 = #12 Sailcloth weight/type: 0.75 -1.5 oz. Nylon Applications: drifters, spinnakers, mizzen stay sails, golly-wobblers etc. Polyester thread #46 Needle size (Metric/Singer): #90= #14 Sailcloth weight/type: 1.5 oz. Nylon 2-4 oz. Dacron Light Cotton Applications: drifters, light air auxiliary sail, dinghy sails Polyester thread #69 Needle size (Metric/Singer): #100= #16 Sailcloth weight/type: 5-7 oz. Dacron 13 oz. Vivatex cotton 4 oz. Nylon Applications: day sailing, main sail, middle-range cruising auxiliary sailboat, light to medium weight bags and sail covers, patches of small daily sails Polyester thread #92 Needle size (Metric/Singer): #110= #18 Sailcloth weight/type: 6-9 oz. Dacron, Nylon webbing 3 oz. Vivatex cotton 14 oz. Duradon acrylic cover cloth Applications: small boat storm sails, inshore cruising and voyaging working sails, general canvas work,, middle-range voyaging and working sails, large boat auxiliary sails. Polyester thread #138 Needle size (Metric/Singer): #120= #19 Sailcloth weight/type: 7-10 oz. Dacron, Nylon or Polyester webbing 16.5 oz. Duradon Applications: voyaging sails and working sails, storm sails, sail corner reinforcement, machine roping. Polyester thread #207 Needle size (Metric/Singer): #140= #22 Sailcloth weight/type: 12-14 oz. Dacron 18.5 oz. Duradon Applications: large working sails and voyage sails, sail corner reinforcement, awnings and covers, storm sails, extra chafe resistance Polyester thread #346 Needle size (Metric/Singer): #200= #25 Sailcloth weight/type: 14 oz. Cotton duck Herculon 18.5-22 oz. Duradon 14-16 oz. Dacron Applications: heavy voyaging sails and commercial sails, commercial steadying sails, commercial canvas work, extra chafe resistance, heavy webbing reinforcement