Overview Product Description Thread size - 1/4" 20tpi Thread - BSW (Whitworth) Grade - 12.9 High Tensile Steel Type - Socket Head Cap screws Product Videos Custom Field Product Reviews Write a Review Write a Review × 1/4" BSW Whitworth 12.9 High Tensile Steel Socket Cap Set Screws Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *