C17500 Beryllium Cobalt Copper Bushing for High-Conductivity Industrial Applications — Precision CNC Machined to Drawing

The C17500 Beryllium Cobalt Copper Bushing has 2.40–2.70% cobalt and 0.40–0.70% beryllium. The excellent conductivity of this alloy is well recognised. We provide customised sizing. Jiaye Dingsheng has been producing copper alloys for more than 25 years since 1997. With a tolerance of ±0.005 mm, they provide accurate CNC machining.

Bushings have outside diameters ranging from 10 to 500 mm and inside diameters ranging from 5 to 450 mm. It has an electrical conductivity of 45–60% IACS and a thermal conductivity of 200–245 W/m·K. Each purchase includes the EN 10204 3.1 test certificates, and the material satisfies ISO 5182, ASTM B534, ASTM B441, and SAE J463 requirements.

Factory - Exterior

Why Choose C17500 Beryllium Cobalt Copper Bushing Over Other Copper Alloys?

The majority of conventional copper alloys are unable to achieve a satisfactory equilibrium between electrical conductivity and mechanical strength. This issue is resolved by the optimised cobalt and low-beryllium composition of C17500 beryllium cobalt copper.

The interior grain structure is refined by cobalt as precipitation hardens. The alloy exhibits a hardness of 95-102 HRB and a conductivity of up to 60% IACS, which is 2.5 times greater than that of standard high-C17500 Beryllium Cobalt Copper Bushing. It functions consistently in the presence of high current, severe mechanical loads, and temperature cycling.

Chemical Composition & Grade Equivalents

Property	Value
Beryllium (Be)	0.40 – 0.70%
Cobalt (Co)	2.40 – 2.70%
Copper (Cu)	Balance
UNS Grade	C17500
EN Designation	CW104C / DIN 2.1285
RWMA Classification	Class 3
Temper Condition	AT / TF00 (Solution Treated + Aged)
Applicable Standards	ASTM B534, ASTM B441, SAE J463, ISO 5182

Key Mechanical & Physical Properties

Parameter	Value
Tensile Strength	680 – 850 MPa
Yield Strength	550 – 720 MPa
Hardness (Aged AT)	95 – 102 HRB
Electrical Conductivity	45 – 60% IACS
Thermal Conductivity	200 – 245 W/m·K
Max Operating Temperature	Up to 400°C
Magnetic Permeability	< 1.001 (fully non-magnetic)
CNC Machining Tolerance	±0.005mm

Core Performance Benefits

C17500 beryllium cobalt copper bushings provide excellent heat dissipation for die casting and welding applications, avoiding component damage and localised overheating. Under prolonged clamping force, a high stable yield strength resists deformation. When used with steel shafts, its unique alloy structure reduces fretting wear and metal adhesion.
It is non-magnetic to eliminate sensor interference and non-sparking in flammable and explosive industrial environments.

Popular Use Cases

Electrode holders and seam welding rollers are examples of resistance welding equipment. Unlike brass and bronze, it resists softening and deformation under high clamping force and current and retains 95–102 HRB at 400°C.
Channel bushings and core pins for plastic injection moulds. High thermal conductivity speeds up cooling and reduces cycle time by 15–25% while withstanding abrasion from glass and fiber-filled resins.
High-current switchgear and connections include low-resistance pivot components with constant conductivity and anti-galling properties to prevent contact welding during fast switching.
Continuous casting guides lessen molten metal splashing, vibration, and thermal stress. For a longer service life, it maintains dimensional stability and corrosion resistance over numerous temperature cycles.

Quality Control and Inspection Process

Before being shipped, every bushing must pass a rigorous three-stage inspection: testing for incoming OES chemical composition; monitoring of rolling and smelting parameters during the process, along with hardness testing; measurement of final eddy current conductivity; ultrasonic inspection for internal defects; and dimensional check. For every batch, EN 10204 3.1 certifications are provided.

Factory - Interior

Size Range & Customization Options

Dimension	Range
Outer Diameter	10mm – 500mm
Inner Diameter	5mm – 450mm
Machining Method	Precision CNC Turning / Grinding
Tolerance Class	ISO g6 / h6 or custom drawing
Surface Finish	Available on request
Custom Specifications	Hardness, conductivity, drawing-based dimensions

You can submit your drawing directly or specify dimensions, and the engineering team will confirm feasibility within 24 hours.

Frequently Asked Questions

Q1: What distinguishes C17500 beryllium copper from C17200?
A1: C17200 is stronger for high load mechanical duty. C17500 is better for heat dissipation and power transmission due to better thermal and electrical conductivity.

Q2: Is this bushing suitable for explosion proof environments?
A2: True. Complies with safety requirements for petro-chemical and flammable-explosive industrial sites. Will not ignite when rubbed.

Q3: In this alloy, what is the role of cobalt?
A3: Cobalt increases the heat treatment properties, high temperature softening resistance and refines the grain structure.

Q4. Any safety comments about machining?
A4: You can safely handle solid finished parts. To minimise the dust generated during processing, ventilation and the use of suitable personal protective equipment are necessary.

Q5: What documents can you offer?
A5: We can give EN 10204 3.1 traceability test certificates with conductivity, hardness and chemical composition.

Contact Us

If you have demands for standard or customized C17500 Beryllium Cobalt Copper Bushing, please send your product parameters and design drawings to js01@jstongcai.com.cn.