Industrial Nuts & High-Strength Fasteners
High-Precision Industrial Nuts, Structural Bolts & Complete Fastener Solutions
Company Introduction
Jiaxing Jinling Hardware Technology Joint Stock Co., Ltd. (Jinling Fasteners) is a premier Chinese manufacturer and global exporter specializing in high-strength industrial nuts, heavy hex structural nuts, precision bolts, washers, and threaded rods. Established in 2005 in Haiyan County, Zhejiang Province, our 15,000+ square meter manufacturing base operates multiple automated high-speed cold heading and tapping lines with an annual output value exceeding RMB 130 million and monthly capacity of 1,500 tons.
Why Choose Jinling Fasteners
Engineered for Precise Thread Tolerances, High Preload Clamping & Zero Structural Failure
In critical engineering infrastructure (petrochemical refineries, high-rise steel buildings, wind power towers, highway bridges, and heavy machinery), fastener failure is catastrophic. Substandard nuts often suffer from thread galling, inconsistent proof load capacity, delayed hydrogen embrittlement, and rapid thread corrosion under harsh outdoor exposure.
Jinling Fasteners guarantees dependable structural integrity through advanced end-to-end manufacturing:
Premium Certified Raw Materials
100% sourced from top-tier domestic steel mills (SWRCH35K, SWRCH45K, 40Cr, 42CrMo, 35CrMoA, 10B21, SS304, SS316) with full spectral material test reports (MTR).
High-Speed Cold Heading & Forging
Multi-station high-speed cold heading and hot forging ensure continuous metal grain flow without micro-cracks or internal voids.
Automated Continuous Heat Treatment
Automatic continuous mesh-belt atmosphere heat treatment achieves uniform core hardness and ductile toughness without surface decarburization.
Zero-Defect Optical Sorting
In-house optical sorting machines and automated go/no-go thread gauging maintain strict 6H / 2B tolerances across millions of units.
Product Quality & Engineering Highlights
High-Speed Multi-Station Cold Heading
High-output automated multi-station cold formers produce up to 200+ pcs/min with precise dimensional consistency and smooth surface finish.
Precision Thread Tapping & Chamfering
High-speed automated CNC nut tappers ensure clean, burr-free internal threads matching Class 6H / 2B / 3B gauge standards.
Hot-Dip Galvanizing & Blue Wax Lubrication
Heavy hex structural nuts receive uniform 50–80µm HDG coating with baking to prevent hydrogen embrittlement, plus blue wax for optimal torque-tension performance.
Multi-Layer Anti-Corrosion Surface Treatments
Specialized in Dacromet, Geomet, Teflon (PTFE), Zinc-Flake, and Yellow/Clear Zinc plating with salt spray resistance up to 1,000–2,000+ hours.
High Proof Load & Hardness Consistency
Strict batch testing ensures heavy nuts meet or exceed ASTM A194 Class 2H proof load requirements (up to 175,000 psi) without thread stripping.
Automated Optical Sorting & Packaging:
360° laser optical sorting eliminates mixing, thread defects, and dimensional deviations before palletizing and container loading.
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![Recessed Heavy Hex Nuts]()
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![7/8-9 — Casing Bolting For Rotating Machines]()
7/8-9 — Casing Bolting For Rotating Machines
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![3/4-10 The Default Diameter Of Inch-Series Plants]()
3/4-10 The Default Diameter Of Inch-Series Plants
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![First Step Into True Flange Bolting]()
First Step Into True Flange Bolting
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![Hot Forged Nuts With Fine Thread]()
Hot Forged Nuts With Fine Thread
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![9/16-12 Zinc-Flake 2H Nut — Extra Preload Margin Beyond The Half-Inch]()
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![1/2-13 A194 2H Nut — The Flange Workhorse in Dacromet Finish]()
1/2-13 A194 2H Nut — The Flange Workhorse in Dacromet Finish
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![2H Heavy Hex Nut]()
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![NYLON LOCK INSERT NUT]()
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![1/4-20 — Minimum Size, Tight-Access Precision]()
1/4-20 — Minimum Size, Tight-Access Precision
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Two Main Product Lines & Structural Technologies
Heavy Hex & High-Strength Structural Nuts
Precision-engineered heavy hex nuts conforming to ASTM A194 2H, ASTM A563 DH, UNI 5587 Class 10/12, and DIN 934 Property Class 10/12.
Designed for high-stress structural joints, high-temperature boilers, and pressure vessel piping.
Key Advantages for Industrial Importers & Contractors
Thickened wall cross-section and higher proof load ratings engineered to match high-strength B7 studs and A325/A490 structural bolts.
Available with factory-applied blue wax lubrication to control nut-rotation factor and guarantee consistent torque-preload tightening on job sites.
Full range of imperial (1/2" to 4" UNC/UNF/8UN) and metric (M12 to M100+) dimensions are available in stock and high-volume production.
Complete 3.1 Mill Test Certification (EN 10204 3.1) provided with chemical composition and mechanical test values.
Recommended Products
Standard Commercial Fasteners & Complete Bolting Assemblies
High-volume standard hexagon nuts, hex head bolts (DIN 931/933), flat washers (DIN 125/ISO 7089), spring washers (DIN 127), and threaded rods (DIN 975/976).
Ideal for wholesale distributor stock and one-stop bulk procurement.
Key Advantages for Industrial Importers & Contractors
Massive 1,500-ton monthly capacity guarantees competitive factory-direct pricing for full-container-load (FCL) orders.
One-stop bundled procurement: combine nuts, bolts, washers, and studs in a single mixed container to minimize logistics overhead.
Custom private-label packaging: neutral small boxes, customized color boxes, gunny bags, and reinforced export wooden pallets with client barcodes.
Flexible order MOQs for fast replenishment and global distributor distribution.
Typical B2B Application Sectors
Structural Steel Construction & Infrastructure:
Massive supply of A325/A490 structural bolts, A563 DH nuts, and F436 washers for high-rise commercial buildings, industrial warehouses, and bridges.
Petrochemical, Oil & Gas Pipelines:
ASTM A193 B7 studs and A194 2H heavy hex nuts engineered for high-temperature and high-pressure pipe flanges, valves, and refinery towers.
Machinery Manufacturing & Automotive OEM:
High-volume supply of standard DIN 933 bolts, DIN 934 nuts, and specialized flanged fasteners for equipment builders and automotive Tier 2/3 suppliers.
Fastener Wholesalers & Hardware Distributors:
Full-container-load mixed shipments of packaged nuts, bolts, washers, and rods for industrial hardware wholesalers and retail chain brands.
Renewable Energy & Power Utilities
Corrosion-resistant hot-dip galvanized and stainless steel fastening sets for photovoltaic solar ground mounts and high-voltage transmission towers.
Customization & OEM/ODM Fastener Engineering
Non-Standard Cold Heading & Forging:
Custom bolt/nut dimensions, step-diameters, non-standard washer face geometries, and specialized knurling based on 2D/3D CAD drawings.
Custom Thread Pitch & Tolerances:
Custom imperial (UNC, UNF, UNEF, 8UN) and metric (coarse and fine pitch) thread profiles with custom thread tolerances (6H, 4H, 2B, 3B).
Private Label Head Markings:
In-mold head markings (manufacturer logo, property class, batch code) matching client private brand specifications.
Custom Export Packaging:
Small inner boxes (100–1000 pcs), kraft cartons (25kg), gunny bags, bulk wooden crates, and palletization with client UPC / FNSKU barcodes.
Frequently Asked Questions
Q: Are you a direct fastener manufacturer or a trading company?
A: We are a direct manufacturer located in Haiyan County, Jiaxing, Zhejiang Province—the heart of China's fastener industry. Established in 2005, we operate a 15,000+ m² facility with multi-station cold heading and tapping lines, producing 1,500 tons of nuts and fasteners per month.
Q: What is your primary product specialization and standard compliance?
A: We specialize in high-strength nuts (Heavy hex nuts A194 2H, A563 DH, DIN 934, UNI 5587), structural bolts (A325, A490, DIN 931/933), washers (DIN 125, DIN 6916, F436), and threaded rods (DIN 975, A193 B7), fully compliant with ISO, DIN, ANSI, ASTM, and JIS standards.
Q: What surface coatings can you provide, and what is the corrosion resistance?
A: We provide Hot-Dip Galvanizing (HDG 50–80µm with optional blue wax lubricant for A563/2H nuts), Zinc Plating (Clear, Yellow, Black Cr3+), Dacromet, Geomet, Zinc-Flake, and Teflon (PTFE) coatings, with salt spray test resistance ranging from 96 up to 2,000+ hours.
Q: What is your Minimum Order Quantity (MOQ) and production lead time?
A: For standard stock items, MOQ is flexible (sample quantities available). For custom production, MOQ is typically 1 to 3 tons per size. Regular production lead time is 20 to 35 days for full container load (FCL) orders.
Q: Do you supply complete bolting sets and mixed-item container consolidation?
A: Yes. One of our core strengths for overseas distributors is consolidating nuts, bolts, washers, and studs in a single mixed container (FCL), drastically simplifying your purchasing logistics and reducing freight costs.
Q: Can you provide free samples and 3.1 inspection certificates?
A: Yes, standard product samples are provided free of charge for quality verification. Every commercial shipment is accompanied by complete EN 10204 3.1 Mill Test Certificates with full chemical and mechanical data.
As one of the most experienced nuts manufacturers and suppliers in China, we also support customized service. Please feel free to buy bulk high-grade nuts made in China here from our factory. For quotation and price list, contact us now.
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