Consew 206 Needles and Thread Standard needles 135 x 17 sizes 12 through 24 Leather needles 135 x 16 sizes 12 through 24 The thickness of the sewing thread must pass freely through the eye of the needle. Left twist thread. NEEDLE AND THREAD CHART Needle Size Thread Size 12 80-90 13 70-80 14 60-70 16 40-60 18 30-40 20 24-30 22 16-24 24 12-16