Material: carbon steel, Alloy steel, stainless steel and brass ; Finishing: zinc plated, copper plating, black, phosphating, mechanical galvanized, hot dipped galvanized, dacromet, etc ; Product Line: bolts, nuts, washers, screws, thread rods, steel structures, non-standard parts, metal stamping; Bolt Class: 4.8、5.8、6.8、8.8、10.9、G-2、 G-5 Nut Class: 6、8、10、2H、HV 10、G-2、G-5

1. Product Type Standards Fasteners: Compliant with DIN/IFI/JIS/ISO standards, covering core automotive products such as shoulder bolts, gear bars, spline screws, truck bolts, four-cornered screws, carriage screws, and T-bolts; chassis components, nuts, sleeves, exhaust pipe hooks, safety belt mandrel parts, and assemblies. Other products: rivets, irregular parts, customized products, mold-closing screws, special screws, and double bolts. 2. Product Specifications and Material Specifications: IFI standard (NO.4–1 inch, maximum length 8 inches), DIN standard (M4–M24, maximum length 200mm). Materials: carbon steel (compliant with ISO-898 and SAE J-429 standards), alloy steel, copper, aluminum alloy, and stainless steel (A2-50, A2-70, etc.). 3. Surface treatments include electro-galvanizing (trivalent chromium, hexavalent chromium), alloy plating (zinc-iron alloy, zinc-nickel alloy), painting (GEOMET, MAGNI, DELTA-TONE, etc.), electroplating of tin/nickel/copper, zinc phosphate, hot-dip galvanizing, and mechanical galvanizing. 4. The anti-loosening design covers chassis components, nuts, sleeves, exhaust pipe suspensions, main shaft parts of seat belts, assemblies, and various fasteners including bolts and nuts, carbon steel screws, stainless steel screws, and bimetallic screws.

Screw in Grade 12.9, 10.9 and 8.8 & SS Screw DIN912/GB70 Hexagon socket head cap screws DIN931~933/GB5782~5783 Hexagon head screws DIN7991 Hexagon socket countersunk head screws ISO7380 Hexagon socket button head screws ISO7379 Hexagon socket head shoulder screws DIN916-45H Alloy Steel hex Socket Head Set Screw

It is a company specialized in production and sales of Carbon steel spheroidizing annealing wire, Alloy steel spheroidizing annealing wire, rivet wire, bright wire. The products are mainly applied in the down stream customers like the suppliers of precision electronic screw, building screws, auto-car fasteners, rivets, precision springs and various Precision Machinery Elements etc.

Haiyan Jinhan Import & Export Co., Ltd. is a comprehensive manufacturing enterprise integrating R&D, production, and sales of high-quality precision machined parts, non-standard bolts and nuts, custom-shaped hardware, and standard fasteners. Leveraging professional technical expertise, we provide customers with end-to-end solutions for non-standard fasteners—spanning everything from design to machining. By employing a combination of processes such as cold extrusion, forging, cold heading, casting, drawing, stamping, welding, and precision machining, we deliver optimized solutions that reduce procurement costs while ensuring superior product quality and reliability. Strategically located at the transportation hub connecting Shanghai, Hangzhou, Suzhou, and Ningbo, our company operates over a hundred units of automated CNC and machining center equipment, complemented by comprehensive auxiliary processing and testing facilities. This infrastructure enables full-process control—from design and development to production and inspection—ensuring high-quality products that meet diverse customer needs. Grounded in a pragmatic approach and enriched by extensive practical experience, we continuously enhance our capabilities to deliver increasingly comprehensive solutions to our clients. Haiyan Jinhan Import & Export Co., Ltd. focuses on the perfect fusion of precision machining and fastening technology; we excel at the precision machining of fasteners and are true specialists in the field. We prioritize customer needs and adhere strictly to the principles of integrity, utilizing world-class management and technology to provide top-tier products and services.

Bolts,nuts,Screws,Washers,Thread Rods,Pin,Rivet,Anchors and construction accessories,and Mechanical accessories in carbon steel,stainless steel,alloy steel,brass & nylon,Production is acc. To DIN,IFI,BS,ISO,AS ,UNI,JIS,GBor Non-standard ,OEM ,or drawings.Samples.etc. GB:530 5780 5782 5784 5781 5783 1228 5785 5786 5787 14 10 8 35 37 901 15389 70 52 6170 6175 1229 55 53 54 6171 6176 6177 DIN:558 601 931 933 960 961 6921 603 608 912 7990 7991 6914 571 186 529 3570 835 916; 975 976; 934 555 6915 5587 6334 439 085 557 6923;125 9021 6916 436 7989 127 ISO:4014 4015 4016 4017 4018 7411 7412 8676 8765 4762 10642 4032 4034 4775 4036 8673 6161 7091 ANSI:B18.2.1/2/3/4 B18.5.2.1M B18.3 B18.6.4 B18.22/21.1;IFI 541 149 111 513 563 538 136 528 128 145 513/ AS:1111 2451 1390 B108 BS:1769 3692 4190 4395-1 7419 2470 4168 1769 3690 4395 4190 1769 3410 4933 JIS B:1180 1186 1189 1171 1182 1166 2809 1176 1194 1181 1163 1170 1256 1251 UNI:5737 9327 5933 5587 5588 5589 704 6952

We provide high-quality fasteners according to the standards of DIN, ISO, ANSI/ASME, IFI, ASTM, BS, AS/NZS, JIS, KS as well as special fasteners at customers requirement. At present, our products include bolts, nuts, washers, and threaded rods covering 4 series and 30 categories. Materials involve carbon steel, alloy steel, stainless steel, etc. Under the collaboration of the staff and with years of experience in marketing, our products enjoy ready markets in United States, Europe, Australia, South-east Asia and other Pacific countries and regions and are well-appreciated by the customers. （DIN934DIN931DIN933）

Bolts, nuts, machine screws, self-tapping screws, plain washers, spring washers, internal teeth washers, external teeth washers, blind rivets, expansion bolts, U-bolts, rivet nuts and spring straight pins of stainless steel 304, 304L, 316, 316L, 310S and other fasteners; High strength alloy steel products of grade 12.9: socket hex bolts, hex bolts, set screws and stopper bolts; Riveting products: self-clinching nuts, self-clinching studs, self-clinching screws, faceplate screw; Products to repair of the screw thread: wire thread inserts and installation tools; Special nylon mushroom head screws; Custom-made non-standard fasteners.

The staple products for Dongrui are serial Multi-Station Cold Upsetting Formers, and the products are protected by many patents. Dongrui products are with complete range of specifications and stable quality which have been sold to everywhere in China and exported to America, Europe, the Middle East and South East Asia etc. in the world. Dongrui products are trusted by customers both at home and abroad. The company has passed through the certifications of ISO 9001:2008 quality management system and CE safety regulation, it has several sets of big size machine centers and a lot of advanced mechanized equipment made in China or imported from abroad, it also has a Technological Development Center at provincial level. The research and development ability and level of Dongrui company always plays a leading role at the fields of same trade in China, due to aiming at high standard and thanks to advanced inspection technique applied through whole production procedure, therefore the quality of Dongrui machines can be reliably guaranteed.

I company for product introduction: 1, steel plate specification available range: 8-650 - mm thickness, width 1500-4020 - mm, length is 4000 mm - 4000 mm, single biggest 30.00 tons.According to the need for more specifications plate also. 2, steel types available: carbon structural steel, high strength low alloy steel plate, Bridges with steel plate, the structure of the building with steel plate, shipbuilding and offshore platform with steel plate, boiler and pressure vessel steel, mould steel, alloy structural steel, oil and gas pipeline steel plate, high strength and high toughness steel, corrosion resistant steel plate, composite steel plate etc. 12 major categories, more than 300 domestic and international brands 3, available for inspection requirements, Z15 - Z35 thickness direction performance requirements, such as high strength and high toughness steel plate. 4, according to national standard and the smelting, AISI/ASME/ASTM, JIS, DIN, French NF, British BS, European EN, international standards such as ISO. 5, for heat treatment process, controlled rolling, normalizing, tempering, normalizing and tempering, conditioning, etc. 6, planking already obtained from ABC, GL, DNV, LR, BV, CCS, RINA classification society certification, NK, KR nine countries.Quality assurance system through the ISO9001-2000 standard certification.20 g, 16 MNR, 16, 20 r MNDR through the inspection-free product certification.