The threaded rods, also names the screw bar or threaded bar, the fastener one kind, uses in constructing the profession basically, has anti-corrosive, the intensity is high, does not distort, durable and so on characteristics. Material: low-carbon steel, mild steel. Surface treatment: plain, the galvanization, yellow zinc plated, the chrome-plating, the phosphorization, becomes dark and so on Rank: Rank: grade 4.8 , grade 5.8 , grade 6.8, grade 8.8, grade10.9, B7 Specification: M4-M52, 3/16'', 5/16'', 7/16'', 9/16'', 1/4'', 3/8'', 5/8'', , , , , , , , , , , Production Length: from 500mm to 4000mm Packing: plastic baled inside, burlap wrapped outside, pallets holds or according to the customers demands. Production standard: Metric system GB (national standard), ISO (international standard), DIN (German standard), JIS (Japanese standard), ANSI/ASTM (US standard), BSW (English standard) ect.