As a member of Chinese Fastener Association, Ningbo Zhenhai Dingli Fastener Screw Co., Ltd. is specialized in manufacturing high strength Headed bolt, Thread stud bolt, Tap end stud, Anchor bolt, Nut, Screw and Washer, which are extensive used in Oil&Gas industry, Petrochemical industry, Power station, Steelwork Construction, Construction Machinery and Electric Equipment.
Its products cover but not limit to the material grade as follows:
ASTM A193: B7, B7M, B16, B8, B8M, B8T;
ASTM A320: L7, L7M, L43;
ASTM A325/325M/A490/A490M: Type1; 
ASTM A449/A394: Type1;
ASTM A354: BC, BD; 
ASTM A370: A, B
ASTM A194/A194M: 2H, 2HM, 4, 7, 7M, 8, 8M, 8T;
ASTM A563: A, C, DH;
ASTM A563M: 8S, 10S;
ASTM A453: 660, 662, 665;  
SAE J429: 5, 8;
ISO 898-1: 8.8, 10.9, 12.9; 
ISO 898-5: 33H, 45H;
ASTM F880, F912; 
ASTM F436: Type1;
ASTM F844