Overview Product Description 12.9 Grade Steel Socket Cap Screws Thread - UNC Thread size - 1/2" - 13 tpi Product Videos Custom Field Product Reviews Write a Review Write a Review × 1/2" UNC 12.9 Grade Unplated 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 *