Custom Grade 8.8 & 10.9 Carbon Steel Heavy Hex Bolts & Fasteners Direct from Yongnian
High-tensile Grade 8.8 and 10.9 carbon steel hex bolts, flange screws, threaded rods, and nuts. Cold-headed in Yongnian District, the Fastener Capital of China, with automated hot-dip galvanizing and continuous heat treatment.
1688 Source Factory Cost vs Global Wholesale Price Estimated Profit Margin: 60% - 80%
Engineering Overview & Manufacturing Capabilities
Yongnian District in Handan City is known as China's premier standard parts manufacturing base, manufacturing over 55% of the country's industrial fasteners and exporting millions of tons to global infrastructure, construction, and automotive projects. Our facility utilizes multi-station high-speed cold heading formers and CNC thread rolling machines to produce DIN 933, DIN 931, ISO 4014, and ASTM A325 compliant structural fasteners.
Manufactured from certified medium carbon steel (1045) and boron-alloyed steel (10B21), our Grade 8.8 bolts deliver minimum tensile strength of 800 MPa and yield strength of 640 MPa with 12% elongation. Grade 10.9 structural bolts exceed 1040 MPa tensile strength. Fasteners undergo continuous mesh-belt furnace quenching and tempering under protective atmospheres to guarantee uniform core hardness (HRC 22-32) without hydrogen embrittlement or surface decarburization.
Surface finishes include electro-galvanized white/yellow zinc (Cr3+ RoHS compliant), hot-dip galvanizing (HDG with coating thickness >45 microns for 30-year outdoor structural durability), black oxide with anti-rust oil immersion, and high-performance Dacromet / Geomet zinc flake coating exceeding 1,000 hours salt spray resistance without red rust.
Industrial Cluster Deep Dive & Supply Chain Edge
Yongnian District (永年区), Handan
The Fastener & Standard Hardware Capital of ChinaLocalized Ecosystem: Yongnian represents extreme industrial integration. Adjacent to the massive steel mills of Handan and Tangshan, fastener plants receive prime wire rod coil directly via freight train at zero regional transport markup. Within Yongnian, annealing facilities, pickling lines, cold heading workshops, thread roller makers, continuous heat-treating furnaces, and automatic hot-dip galvanizing lines operate around the clock.
The "Neijuan" Source Factory Edge: Massive localized volume makes Yongnian the price-setting benchmark for global fastener trading. A Grade 8.8 M10x50 hex bolt that sells for $0.45 - $0.70 in American or European industrial supply stores is priced at just $0.035 - $0.07 ex-factory in Yongnian, offering immense wholesale profit margins for importers.
Transparent Volume Tier Pricing Matrix (EXW / FOB)
| Order Volume Tier | Unit Factory Price (USD) | Production Lead Time | Buyer Advantage |
|---|---|---|---|
| 5,000 - 19,999 pcs | $0.045 / pc | 7-10 days | Small Commercial Order |
| 20,000 - 49,999 pcs | $0.038 / pc | 10-12 days | Standard Wholesale Tier |
| 50,000 - 199,999 pcs | $0.035 / pc | 12-15 days | Volume Distributor Tier |
| 200,000+ pcs (FCL) | $0.031 / pc | 18-20 days | Full 20GP Container Load (25 Tons) |
End-to-End Production & Quality Control Process
Wire Rod Annealing, Pickling & Spheroidizing
Heavy 10B21 or 1045 steel wire coils are spheroidized in bell-type nitrogen atmosphere annealing furnaces, acid-pickled to remove scale, and coated with phosphate lubricant.
Multi-Station Cold Heading & Shank Extrusion
High-speed 5-station cold heading machines shear wire blanks and forge the hexagonal bolt head and shank taper at up to 250 parts per minute.
High-Precision Thread Rolling
Shanks are passed through flat or rotary cylindrical thread dies, cold-forming threads with compressed grain flow for superior fatigue resistance compared to cut threads.
Continuous Mesh-Belt Quenching & Tempering
Bolts travel through an endothermic gas-protected mesh-belt furnace at 860°C, oil-quenched, and tempered at 450°C to achieve Grade 8.8 structural ductility.
Automated Optical Sorting & Bulk Packing
Bolts pass through 360-degree glass plate optical sorting machines checking 18 critical dimensions, then packed into 25 kg export cartons and shrink-wrapped on Euro pallets.
Comprehensive Technical Specifications
| Manufacturing Cluster | Yongnian District, Handan, Hebei (China Fastener Capital) |
|---|---|
| Standard Production Lead Time | 10-15 days |
| Minimum Order Quantity (MOQ) | 5000 pcs (Multi-size/style supported) |
| Strength Grade | Class 8.8 (Tensile ≥800 MPa, Yield ≥640 MPa) / Class 10.9 (≥1040 MPa) |
| Thread Size Range | Metric M6 up to M36 (Imperial 1/4" up to 1-1/2") |
| Bolt Length Range | 10 mm up to 300 mm (Full thread or partial thread shanks) |
| Manufacturing Standard | DIN 933 (Full thread), DIN 931 (Half thread), ISO 4014, ISO 4017, ASTM A325 |
| Thread Pitch | Standard metric coarse pitch (Fine pitch available upon request) |
| Core Hardness | Grade 8.8: HRC 22 - 32 (HV 250 - 320); Grade 10.9: HRC 32 - 39 |
| Salt Spray Resistance | Clear Zinc: 72 hrs; Yellow Zinc: 96 hrs; HDG: 500+ hrs; Dacromet: 1,000 hrs |
| Head Marking | Grade 8.8 / 10.9 + Manufacturer ID mark (custom client stamping supported) |
| Materials | Medium Carbon Steel (AISI 1045), Boron Alloy Steel (10B21), Chromium-Moly Alloy Steel (40Cr / 4140), Low Carbon Steel (Q235 / 1008) |
| Finishes & Treatments | Electro-Galvanized White Zinc (Cr3+), Yellow Zinc Dichromate, Hot-Dip Galvanized (HDG >45μm), Black Oxide with Oil, Dacromet / Geomet Flake |
International Compliance & Quality Certifications
Ocean Freight & Port Logistics (Tianjin Port Corridor)
Primary Seaport of Departure
⚓ Tianjin Port (Xingang) - 380 km direct freight highway corridor
Air Cargo Express Hub
✈️ Zhengzhou (CGO) or Beijing Capital (PEK) for express air shipments
Container Stuffing Capacities
📦 20GP Container: Exactly 25 to 27 Metric Tons (maximum payload allowable by ocean lines)
Harmonized Tariff HS Code
📋 7318.15.00 (Threaded bolts and screws of iron or steel)