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Hexagonal Chemical Hardware Galvanized Through Nut Chemical Screws Accessories
Hexagonal carbon steel galvanized through nut precision chemical screws and accessories designed for industrial applications requiring high precision and corrosion resistance.
Application Scenarios and Characteristics
Hexagon carbon steel galvanized screws are primarily used in non-strongly corrosive, medium-low load, and precision assembly scenarios in chemical equipment. Machining significantly improves dimensional accuracy and thread consistency, making them suitable for equipment sealing and long-term stable operation.
Service conditions: C2-C3 corrosive environment (low-medium pollution, low salt spray)
Restriction: Prohibited in strong acid, strong alkali, high chloride ion (Cl⁻), hydrogen sulfide (H₂S) media
Rotating Equipment (Pumps, Fans, Stirrers, etc.)
Application: Bases, bearing housings, coupling guards, cooling systems and other non-sealed, non-pressure parts
Service conditions: Vibration environment, circulating water/cooling air, slight condensation
Advantages: High strength (mainly Grade 8.8), anti-vibration, easy maintenance
Instruments and Control Systems
Application: Fixing and installation of transmitters, flow meters, control cabinets, junction boxes
Service conditions: Clean, low humidity, no direct contact with process media
Key point: High machining precision ensures instrument positioning and long-term stability
Auxiliary Systems and Non-Critical Components
Application: Ladders, platforms, guardrails, ventilation ducts, cable trays, etc.
Service conditions: Outdoor/semi-outdoor, industrial atmosphere, small amount of dust and moisture
Recommendation: Prioritize hot-dip galvanizing (thick coating, long corrosion resistance)
Core Characteristics of Material and Process
Material and Strength (Carbon Steel)
Common grades: Grade 4.8 (low carbon steel, unquenched), Grade 8.8 (medium carbon steel, quenched and tempered)
Performance: Grade 8.8 tensile strength ≥ 800 MPa, balancing strength and toughness for medium-low load in chemical equipment
Limitation: Bare carbon steel is not corrosion-resistant and requires surface treatment
Galvanizing for Corrosion Protection
Principle: Zinc acts as sacrificial anode, corroding preferentially to protect the steel substrate.
Process
Coating Thickness
Salt Spray Resistance (NSS)
Application Scenario
Electro-galvanizing (blue/color zinc)
5-15 μm
48-120 h
Indoor, dry, mild corrosion
Hot-dip galvanizing
50-150 μm
500-1000 h
Outdoor, humid, industrial atmosphere
Environmental taboos: Not resistant to strong acid, strong alkali, high Cl⁻, H₂S, high temperature and high humidity organic acids.
Precision Advantages of Machining
Dimensional accuracy: Smaller tolerances for hexagon width across flats, thickness, shank diameter, thread pitch diameter (up to Grade 6g/6h)
Thread quality: Complete profile, no burrs, smooth fitting, better sealing surface fit
Consistency: Stable precision per piece/batch, suitable for precision assembly and repeated disassembly
Customization: Capable of machining non-standard lengths, special threads, stepped shanks, chamfers and other complex structures
Selection and Application Guidelines
Environment matching: Dry & clean (C1): Electro-galvanized Grade 4.8/8.8; Industrial atmosphere/humid (C2-C3): Hot-dip galvanized Grade 8.8; Strong corrosion / high Cl⁻: Forbidden, use 316 stainless steel, Hastelloy, etc.
Strength and load: Static load / non-critical: Grade 4.8; Dynamic load / vibration / critical structure: Grade 8.8 or higher
Sealing and assembly: Sealing surfaces: High machining precision + gaskets/sealant to prevent media leakage; Preload: Tighten strictly according to torque values to avoid loosening and galling
Maintenance and service life: Regularly inspect coating integrity; repair or replace if damaged; Service life of hot-dip galvanizing in C3 environment: approx. 15-20 years
We have introduced advanced equipment and technology from Japan and Germany (CNC 5-axis and 6-axis machines) to better serve our customers' needs. Our maximum processing outer diameter is 60, and the minimum control tolerance is 0.001.
Manufacturing Capabilities
Main Products
Stainless steel screws, carbon steel screws, pins, rivets, nuts, eccentric nails, embedded parts, and other fasteners
Business Type
Factory / Manufacturer
Services
CNC Machining, Turning and Milling, CNC Turning, Cold heading, Stamping, Assembly Service
Our company has a total of 300 employees, including 20 technicians, 10 engineers, and 15 quality control personnel. We have over 300 pieces of equipment and implement 8S management with ISO9001 and TS16949 automotive certifications.
Notable Customers
Our customers include bo-sch, Foxconn, Motors, Husqvarna, Shimano, NVIDIA, DJI Drones, Siegenia, and Cater-pillar.
