Stainless Steel Hexagonal Head Screws, Chemical Screws & Cold Heading Processing Services
Stainless steel hexagonal head screws, chemical screws, cold heading processing services
Application Scenarios and Characteristics of Allen Head Cap Screws in Chemical Hardware
Cold Heading Process & Multi-Material Production Capability
Allen head cap screws (cylindrical head hexagon socket screws) are widely used in chemical equipment, pipelines, instruments, and anti-corrosion devices due to their high torque, low profile, and suitability for precision assembly. Cold heading is the mainstream and efficient forming process.
Based on the same screw specification, we can switch materials such as carbon steel, stainless steel, alloy steel, titanium alloy, and copper alloy to adapt to different chemical environments and strength requirements.
Core Application Scenarios of Allen Head Cap Screws in Chemical Hardware
Chemical Equipment & Reactors
- Used for fastening shells, flanges, manholes, nozzles and key parts of reactors, heat exchangers, towers, storage tanks
- Suitable for acid, alkali, solvent, high/low temperature working conditions
- Advantages: Hexagon socket can bear high torque; the head can be embedded into the equipment surface to reduce fluid resistance and material accumulation
Chemical Piping & Valve Systems
- Used for connecting flanges, valve bodies, pumps, filters, flowmeters
- Suitable for corrosive media (acids, alkalis, salts, organic solvents, oil and gas)
- Advantages: High sealing fit, anti-vibration and fatigue resistance, suitable for high-pressure/vacuum piping systems
Instruments & Precision Devices
- Used for assembling chromatographs, analyzers, sensors, metering pumps, valve actuators
- Requiring high precision, low interference, easy maintenance
- Advantages: Small head, hexagon socket drive, suitable for narrow spaces and automated assembly
Anti-Corrosion & Special Working Conditions Devices
- Used for anti-corrosion/linings equipment, FRP/plastic equipment, electrolytic cells, electroplating baths
- Requiring chemical resistance, non-magnetic, insulation
- Advantages: Available in 316L, Hastelloy, titanium alloy for strong corrosion, high temperature, high salt spray environments
Other Chemical-Related Fields
- Pharmaceutical/food equipment (CIP/SIP cleaning)
- Environmental protection equipment (waste water/waste gas treatment)
- Laboratory devices, marine chemical equipment
Core Characteristics in Chemical Hardware
Structural & Assembly Advantages
- Hexagon socket drive: High torque transmission efficiency, not easy to slip
- Cylindrical (cap) head: Low profile, countersunk installation, reducing protrusion interference
- High precision: Cold heading + thread rolling, dimensional accuracy up to IT7-IT8
Mechanical Performance Advantages
- High strength: Cold heading forms dense metal grains and continuous fibers
- Wide grade range: Class 4.8 (general), 8.8/10.9/12.9 (high strength)
Chemical & Environmental Resistance
- Material diversity: 304/316 stainless steel, carbon steel, alloy steel, titanium, copper, Hastelloy
- Surface treatment: Zinc plating, Dacromet, blackening, passivation, PTFE coating
Maintenance & Cost Advantages
- Easy installation & removal: Universal hexagon socket wrench
- High-efficiency cold heading: High mass production efficiency, material utilization >90%
Core Advantages of Cold Heading Allen Head Screws
Process Principle
At room temperature, the metal wire is extruded and plastically deformed through multi-station dies to form the head and shank, then threaded by thread rolling. It is a near-net-shape, non-cutting process.
Key Benefits
- Improved strength: Continuous metal fiber and refined grains, tensile strength 15%-20% higher than machined parts
- Efficiency & cost: Multi-station cold heading machine produces 200-500 pieces per minute, material utilization 85%-95%
- High precision & consistency: Small dimensional tolerance, smooth surface
- Wide material adaptability: Carbon steel, stainless steel, copper alloy, aluminum alloy, titanium alloy
Multi-Material Solution for Same-Spec Allen Head Screws
| Material |
Core Properties |
Chemical Hardware Applications |
Surface Treatment |
Strength Grade |
| 304 Stainless Steel |
Neutral corrosion resistance, non-magnetic, easy to clean |
General chemical, food/pharma equipment, indoor dry conditions |
Passivation, electro-polishing |
A2-70 |
| 316/316L Stainless Steel |
Acid/alkali, seawater, chloride resistance |
Chemical reactors, marine chemical, high salt spray |
Passivation, pickling |
A4-70/A4-80 |
| Carbon Steel (1018/1022) |
Low cost, high strength |
Non-corrosive indoor equipment, pipe supports, non-critical parts |
Zinc, Dacromet, black oxide |
Class 4.8/8.8 |
| Alloy Steel (40Cr/35CrMo) |
Ultra-high strength, fatigue resistance |
High-pressure equipment, heavy chemical machinery, key structures |
Black oxide, phosphating, quenching & tempering |
Class 10.9/12.9 |
| Titanium Alloy (TC4) |
Ultra-light, strong corrosion resistance, non-magnetic |
Strong corrosive media, aerospace chemical, electrolytic, medical chemical |
Anodizing, passivation |
High strength |
| Copper Alloy (Brass/Bronze) |
Conductive, corrosion-resistant, low magnetic |
Electrical chemical, explosion-proof, instruments, seawater service |
Nickel plating, passivation |
Medium strength |
| Hastelloy / Nickel Alloy |
Strong acid/alkali & high-temperature corrosion |
Extreme corrosive conditions (HCl, H₂SO₄, high-temperature flue gas) |
Special passivation |
High strength |
Core Value of Multi-Material Production
- One-stop supporting: For the same equipment/component, customers can select different materials for corrosive/non-corrosive zones
- Cost optimization: Carbon steel/304 for non-critical areas, 316/titanium for key corrosive areas
- Fast response: Universal cold heading dies, only switching wire material and process parameters
- Stable quality: Same specification, same process, different materials, high dimensional accuracy
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. We have Japanese CNC Tsugami, CNC Citizen, multi-station cold extrusion forming machines, 500T press machines, casting equipment, and various process equipment.
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. Our company implements 8S management and has passed ISO9001 and TS16949 automotive certifications. Our customers include leading companies in various industries.
Core Hardware Categories
- Structural Support Category: Base, bracket, column, fixing fixture, load-bearing platform
- Sealing & Connecting Category: Bolts/nuts, washers, clamps, joints, flanges, valve components
- Transmission & Adjustment Category: Gears, lead screws, sliders, bearings, adjustment knobs
- Protection & Filtration Category: Metal filters, filter elements, protective grilles
- Conductive & Thermally Conductive Category: Electrode probes, terminal blocks, heat-conducting sheets
- Auxiliary Function Category: Handles, latches, hinges, foot pads
Materials & Core Properties
| Hardware Category |
Mainstream Materials |
Core Properties |
| Structural Support |
304/316 Stainless Steel, Anodized Aluminum |
Corrosion-resistant, high strength (load-bearing ≥50kg), rust-proof |
| Sealing & Connecting |
316L Stainless Steel, Hastelloy |
Highly corrosion-resistant, leak-proof sealing (≤10MPa), no leaching |
| Transmission & Adjustment |
Precision Stainless Steel, Titanium Alloy |
High precision (tolerance ±0.005mm), low friction |
| Protection & Filtration |
316L Stainless Steel Filters, Monel Alloy |
Filtration precision ≤10μm, high temperature resistance ≤500℃ |
| Conductive & Thermally Conductive |
Nickel-plated Brass, Pure Copper |
Conductivity ≥58MS/m, thermal conductivity ≥100W/(m*K) |
| Auxiliary Function |
Ordinary Stainless Steel, Galvanized Steel |
Easy to process, cost-effective, suitable for indoor environments |
Core Functions for Instruments
- Stability & Safety: Support components ensure no vibration under high-speed/high-pressure conditions
- Precision Enhancement: Transmission components achieve micro-displacement adjustment (±0.001mm)
- Service Life Extension: Corrosion and wear-resistant materials extend hardware service life to 5-8 years
- Scenario Adaptability: Filter components adapt to complex sample processing
- User Experience Optimization: Auxiliary components comply with ergonomics
Our Capacity
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
Materials
- Aluminum: AL 6061-T6, 6063, 7075-T etc
- Stainless Steel: 303,304,304L,316L,316F,630,410,420,430, etc
- Steel: 4140, Q235, Q345B,20#,45# 1215,12L14,1144,1006,1008,1010,1015,1018,10B21,1035,1065 etc.
- Alloy Steel: 5140,4135,4140,3435,5120,415,435,440 etc
- Titanium: TA1,TA2/GR2, TA4/GR5, TC4, TC18 etc
- Brass: C36000 (HPb62), C37700 (HPb59), C26800 (H68), C22000(H90),C27000,C51900,C11000,C3604,H62,H65 etc
- Other: Copper, bronze, Magnesium alloy, Delrin, POM, Acrylic, PC, etc.
Finishing & Quality Control
Finishes: Sandblasting, Anodize color, Blackening, Zinc/Nickel Plating, Polish, Power coating, Passivation PVD, Titanium Plating, Electrogalvanizing, electroplating chromium, electrophoresis, QPQ, Electro Polishing, Chrome Plating, Knurl, Laser etch Logo
Technical Specifications:
Drawing format: STEP, STP, GIS, CAD, PDF, DWG, DXF
Tolerance: +/-0.01mm ~ +/-0.05mm
Surface roughness: Ra 0.1~3.2
Inspection Equipment: Complete inspection lab with Micrometer, Optical Comparator, Caliper Vernier, CMM, Depth Caliper Vernier, Universal Protractor, Clock Gauge, Internal Centigrade Gauge
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