Overview Product Description Thread - UNF Size - 1/2" - 20 tpi 12.9 Grade high tensile steel Zinc plated All sizes are part threaded measured from under the head Product Videos Custom Field Product Reviews Write a Review Write a Review × 1/2" - 20 tpi UNF ZINC 12.9 SOCKET CAP BOLTS Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *