Tension Control Bolts also called Twist Off Bolts, are one of the most popular utilization in high-strength structural connection. ItemTwist Off Type Bolts Round Head grade 10.9 MaterialCarbon Steel BrandR from Hebei Jinan Head typeRound head SizeM16-M30,1/2"--1-1/4" GradeClass 8.8/10.9/12.9 FinishHDG/ Black/dacromet StandardASTM A325/ F1852 ,A490/F2280 ANSI/ASME B 18.2.6 - 2003 Steel structure with high strength round torsional shear bolt ASTM F 1852 / ASTM F 2280 Packaging & Delivery Carton size26X26X13mm Carton Gross weight25.00 kg pallet size80x100cm Package typebulk in plastic bag of Carton box on Wood pallet 3 or 4 layers Lead Timein stock or negotiable date Certification of Quality Guarantee CE Certified Valid from 2019-01-29 until 2024-01-28 ISO9001-2015 Valid from 2018-04-20 until 2021-03-30 High Strength Fasteners manufacturer website:http://www.jn-fastener.com/high-strength-fasteners/