Hexagonal aluminum bars are widely used in scenarios such as anti-slip fastening, torque transmission, and special-shaped assembly due to their hexagonal cross-sectional characteristics. The mainstream materials cover three categories: pure aluminum, corrosion-resistant aluminum, and high-strength aluminum. They can be formed by cold drawing (accuracy ±0.05mm) or hot extrusion (cross-sectional size Φ5-200mm).
Detailed explanation and technical parameters of mainstream grades
1. 1XXX series pure aluminum hexagonal bar
1060 hexagonal aluminum bar (H14 state)
Characteristics: conductivity ≥62% IACS, hardness HB 22-28, elongation ≥20%
Processability: cold heading forming (reduction rate ≤75%)
Application: electrical terminals, anti-static tool handles
1350 hexagonal aluminum bar (O state annealing)
Characteristics: aluminum purity ≥99.5%, thermal conductivity 237 W/(m·K)
Process: high-frequency induction heating bending (minimum bending radius R=1.5t)
Application: radiator connecting rod, heat exchanger bracket
2. 6XXX series alloy hexagonal bar
6061-T6 hexagonal aluminum bar (general high strength)
Composition: Mg 1.0%, Si 0.6%, Cr 0.2%
Mechanical properties: tensile strength 310MPa, fatigue limit 120MPa (10^7 cycles)
Surface treatment: hard anodizing (film thickness 50μm, hardness HV≥400)
Application: robot joint hexagonal shaft, CNC machine tool fixture
6063-T5 hexagonal aluminum rod (high surface quality)
Characteristics: roughness Ra≤0.8μm, extrusion molding tolerance ±0.1mm
Process adaptation: reflectivity after mirror polishing ≥85% (special for decorative parts)
Application: luxury display racks, architectural decorative bolts
3. 2XXX/7XXX series high-strength hexagonal bars
2011 hexagonal aluminum bars (easy-to-cut type)
Advantages: 0.4% lead content, cutting speed up to 300m/min (50% faster than 6061)
Applications: precision instrument adjustment screws, watch gear shafts
7075-T6 hexagonal aluminum bars (aviation grade ultra-high strength)
Performance: tensile strength 570MPa, specific strength up to 210MPa/(g/cm³)
Processing restrictions: PVD coated tools are required (edge temperature <300℃)
Applications: aircraft engine connecting rods, racing car drive shafts
Special functional aluminum hexagonal bars
Anodized hexagonal aluminum bars
Black oxide hexagonal bars: surface hardness HV 350-400, wear resistance increased by 3 times
Color electrophoresis hexagonal rod: color difference ΔE≤1.0, suitable for medical equipment handles
Hollow hexagonal aluminum rod
Specifications: width across flats 10-80mm, wall thickness 1.5-8mm
Advantages: 30% weight reduction while maintaining torsional strength (torque ≥200N·m)
Threaded pre-set hexagonal aluminum rod
Cold rolling thread rolling process: thread accuracy 6g level, with stainless steel nuts to prevent galvanic corrosion
Application: offshore platform fastening system, photovoltaic bracket connectorsIV. Key performance comparison table
Grade Tensile strength (MPa) Conductivity (%IACS) Corrosion resistance grade (CCT rating) Typical application scenarios
1060-H14 95-120 62 CA (mildly corrosive environment) Low-voltage electrical connectors
6061-T6 260-310 43 CB (moderately corrosive environment) Automation equipment drive shaft
7075-T6 540-580 33 CC (surface protection required) Aerospace fasteners
2011-T3 380-430 28 CC Precision mechanical adjustment parts
Selection and application suggestions
Corrosion protection first: Select 5052/5083 series hexagonal aluminum bars (Mg content 4-5%), salt spray test > 2000 hours
High strength and lightweight: 7075-T6 hexagonal bars are 30% stronger than steel, but require micro-arc oxidation treatment (film thickness > 30μm)
Cost control solution: Recycled aluminum hexagonal bars (such as B-grade 6061) are 25% cheaper and are suitable for non-load-bearing structural parts
Processing precautions
Cutting processing ：
2XXX/7XXX series hexagonal bars need to add cutting fluid (recommended 10% emulsion concentration)
Feed rate control: 7075 material recommended <0.15mm/turn
Cold heading forming：
6063-O state hexagonal bar cold heading compression ratio ≤80%
Mold preheating temperature: 150-200℃ (to prevent surface cracks)
Welding process：
6XXX series hexagonal bars recommend MIG welding (Ar+He mixed gas protection)
Aging treatment is required after welding (175℃×8h to restore T6 performance)
