Overview Reviews Product Description BSW 5/16" 18 Go Thread Ring Gauge Dec. .3125" Frac. 5/16" TPI 18 Class Medium Description 5/16x18 BSW Go Thread Ring Member Standard BS84 & BS 919 Product Videos Custom Field Product Reviews Write a Review Write a Review × 5/16 x 18 BSW Go Thread Ring Member Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *