Hollow Chrome Rod/Bar
BAOKUN‘s hollow chrome rod is a high-precision, lightweight bar manufactured through cold drawing/hot rolling process, with hard chrome plating (thickness 5-30μm), which is widely used in high-strength, wear-resistant scenes such as hydraulic systems, automation equipment, and engineering machinery.
Key features of Chrome Hollow Bar:
1.Lightweight design:
The hollow structure reduces weight by 30%-50% (compared with a solid shaft with the same outer diameter), reduces inertial load, and improves dynamic response speed.
2.Torsional strength:
Through the optimization of the annular section, the torsional stiffness is increased by 15%-20% compared with the solid shaft (at the same weight).
3.Wear and corrosion resistance:
The hard chrome plating (HV 800-1000) reduces the friction coefficient (μ≤0.12), and the salt spray test is ≥500h (ASTM B117).
4.Processing flexibility:
The inner hole can be pre-processed (tolerance H7-H9), supporting secondary fine grinding (dimensional accuracy ±0.02mm), drilling, and tapping integration.
5.High straightness:
The cold drawing process ensures a straightness of ≤0.3mm/m, reducing the cost of subsequent straightening processes.
Chrome Plated Hollow Rods Manufacturer
Baokun offers high-quality hollow chrome rods and bars, engineered to meet the demands of various industrial applications. Our rods are made with precision and are available in a wide range of sizes and specifications to suit your specific needs.
The chrome plating enhances corrosion and wear resistance, making these rods ideal for environments where durability is essential. Our rods can ensure long-term performance and reliability.
Whether you require standard dimensions or custom specifications of hollow chrome rods, Baokun delivers consistent quality and timely delivery.
Specifications of Chrome hollow Bar
| Material
grade |
Standard
system |
Characteristics | Applicable |
| CK45 | DIN
17200 |
Medium carbon steel, quenched and tempered,
hardness 28-32HRC, high fatigue resistance |
General mechanical transmission shaft,
gearbox support shaft
|
| ST52 | EN
10025 |
Low alloy high strength steel,
yield strength ≥355MPa, good weldability |
Engineering machinery hydraulic cylinder,
structural parts |
| SAE4140 | ASTM
A322 |
Chromium-molybdenum alloy steel, strong hardenability,
impact resistance + corrosion resistance |
Heavy-duty gear shaft,
oil drilling equipment |
| SCM440 | JIS
G4105 |
High hardenability,
hardness ≥55HRC after high-frequency quenching |
Precision machine tool spindle,
automobile steering knuckle |
| 42CrMo4 | ISO
683-1 |
Ultra-high strength (tensile strength ≥1000MPa),
high temperature creep resistance |
Wind power spindle,
aerospace components |
Hollow chrome shaft vs Solid chrome shaft
| Comparison items | Hollow Chrome Bars | solid chrome-plated shaft |
| Weight | 30%-50% lighter (same outer diameter) | fully solid |
| Torsional strength | 15%-20% higher (same weight) | dependent on diameter increase |
| Material cost | save 20%-40% steel | high cost |
| Heat dissipation performance | inner hole can pass cooling medium | only surface heat dissipation |
| Designability | can integrate hydraulic oil circuit/wiring | single function |
| Ultimate load | suitable for dynamic load | more suitable for static overload |
Technical Parameters
| Item | Parameter Range |
| Outer diameter | Φ20mm – Φ300mm |
| Wall thickness | 5mm – 50mm |
| Length | 3m – 12m (customizable) |
| Coating thickness | 5-30μm (customizable) |
| Straightness tolerance | ≤ 0.3mm/m |
| Tensile strength | 600MPa – 1200MPa |
| Surface hardness | Chrome layer HV ≥ 800, base material HB 200-320 |
| Surface roughness | Ra ≤ 0.4μm |
Applications of Hollow Chrome Plated Bar/Rods
1.Engineering machinery
Hydraulic cylinder piston rod, excavator arm pin (ST52 material + 30μm chrome plating).
2.Automobile manufacturing
Gearbox drive shaft (SAE4140 quenching and tempering), new energy vehicle motor output shaft (42CrMo4).
3.Mold industry
Injection molding machine guide column (SCM440 high-frequency quenching), stamping mold guide shaft (CK45 hard chrome plating).
4.Automation equipment
Industrial robot joint shaft (high-precision grinding + Ra≤0.2μm).
5.Ship heavy industry
Chrome-plated rods are widely used in marine hydraulic cylinders, steering systems, lifting equipment, hatch covers, and other heavy-duty mechanisms. Their corrosion resistance, wear resistance, and load-bearing performance make them suitable for harsh saltwater and high-humidity environments.
Get a Quote for Custom Hollow Chrome Rods
Baokun supplies bulk hollow chrome rods for hydraulic cylinders, automation equipment, and industrial machinery. Custom sizes, materials, chrome thicknesses, tolerances, and end machining are available. Controlled production, inspection, flexible quantities, and export packaging support consistent quality and reliable delivery. Contact us for a quote.
Benefits of BAOKUN'S Hollow Chrome Plated Rods
- High Strength-to-Weight Ratio: These rods provide excellent strength while remaining lightweight, making them ideal for reducing the overall weight of your machinery or equipment.
- Superior Torsion Resistance: Designed to withstand significant torsional forces, they are perfect for applications that demand high torque handling without deformation.
- Excellent Surface Finish: With a surface finish of Ra≤0.4μm, our hollow chrome rods ensure smooth performance and reduce friction, contributing to longer service life and improved efficiency.
- Replacement for Traditional Solid Shafts: These rods can effectively replace solid shafts, offering a more efficient and cost-effective solution for many applications.
- Cost Efficiency: By reducing weight and enhancing performance, Baokun’s hollow chrome rods help lower system energy consumption and material costs, making them a more economical choice for your business.
Quality inspection process of Hollow Chrome Rods
1.Chemical composition analysis
Spectrometer detects material elements.
2.Hardness test
Rockwell/Brinell hardness tester multi-point detection.
3.UT flaw detection
Detect internal cracks/inclusions.
4.Dimension detection
Full-size scanning with three-coordinate measuring machine.
5.Surface inspection
White light interferometer detects roughness/coating uniformity.
6.Torque test
Simulate actual working conditions and load to 1.5 times rated torque.
7.Salt spray test
Customized according to customer needs.
FAQ
How to choose the material?
According to the load type: dynamic impact select SAE4140/42CrMo4; static heavy load select ST52/CK45.
Can the hollow shaft replace the solid shaft?
It can be replaced in the scene with high torsional strength requirements and weight sensitivity (the working condition parameter calculation verification is required).
How to control the risk of chromium plating falling off?
Adopt micro-crack chromium process (crack density ≤80/cm²), combined with sandblasting activation treatment of substrate before electroplating.
Does it support non-standard customization?
Customizable special-shaped cross-section (hexagonal/spline), inner hole step structure, special plating (nickel-based alloy).
How long is the delivery ?
7-15 days for standard specifications and 20-30 days for customized products.
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