Spindle

What is a Spindle

A Spindle is the central shaft used in an integrated bicycle crank system. It connects the left and right crank arms and transfers the rider’s pedaling force to the drivetrain, allowing the bicycle to move.

As a critical structural and load-bearing component, the spindle must provide high strength, precise alignment, and long-term durability to ensure smooth rotation and stable power transmission

Key Features of Spindle

Designed for integrated crank systems

Used in one-piece bicycle cranksets to transmit pedaling force efficiently.

High-strength alloy steel

Made from SCM435, offering excellent strength, toughness, and fatigue resistance.

Precision machined

CNC and turning-milling machining ensure accurate dimensions and smooth rotation.

Corrosion-resistant surface

Chemical nickel plating improves wear and corrosion resistance.

Stable and durable

Capable of withstanding high torque and long-term cycling loads.

Customized Spindles

HuiBo provides customized bicycle spindles based on customer drawings, samples, and technical requirements for integrated crank systems.

Customization includes spindle length, diameter, spline or interface design, thread specifications, material grade (SCM435), and surface treatment such as chemical nickel plating. Cold forging and precision CNC machining ensure high strength, accurate fit, and stable performance.

We support both prototype development and mass production for customized bicycle spindle components.

Production Process

The bicycle spindles are manufactured through a controlled and precise process to ensure strength, accuracy, and surface quality.

Raw material inspection – SCM435 steel is checked before production.

Cutting and preparation – Material is cut to suitable length for forging.

Cold forging – The spindle blank is formed to near-net shape.

CNC turning – Outer diameters and shaft features are machined.

Turning & milling – Spline, threads, and precision structures are finished.

Heat treatment (if required) – Mechanical properties are optimized.

Chemical nickel plating – Surface is treated for corrosion and wear resistance.

Packaging – Packed in wooden pallets or crates.

Shipping – Delivered to customers.

Customization is available!

Why Huibo

01 One-Stop Fastener Supplier

HuiBo has over 20 years of experience in the production of fasteners and precision components. In addition to standard products, we specialize in non-standard and customized fasteners manufactured according to customer drawings, samples, and technical requirements.

For complex parts, we apply multiple cold forging processes and multi-stage CNC machining to achieve precise shapes, tight tolerances, and high structural strength, ensuring every custom product meets demanding engineering standards.

02 Competitive Pricing

With an integrated production system covering raw material sourcing, cold forging, CNC machining, heat treatment, and surface treatment, HuiBo controls all key processes in-house. This allows us to effectively reduce costs while maintaining stable quality, making our prices highly competitive for both standard and customized fasteners.

03 Guaranteed Delivery

HuiBo operates its own logistics and shipping department, responsible for production scheduling, shipping arrangement, cargo tracking, and export documentation. Whether for standard products or customized non-standard parts, we ensure reliable and on-time delivery to meet different customer and project requirements worldwide.

https://www.hbrailwayfastening.com/spindle.html