Motor Internal Spline Shaft

Produced by Ningbo Romy Fasteners Co., Ltd. with advanced technology, built for reliable performance

Category EV & Mobility Parts

Motor Internal Spline Shaft

Internal spline motor shaft for electric tricycle drive. 16‑tooth internal spline formed by one‑step cold heading.

As Your Trusted Cold Heading Partner, We Deliver Quality, Efficiency, And Customization

Core Strengths

Boasting 30+ years of mold development and 1,000+ precision molds, we offer one-stop customization with free design and sampling for non-standard components.

Facilities & Production Capacity

Equipped with 23 advanced cold heading machines, we deliver 1.2M+ pieces daily. Our in-house mold workshop ensures short lead times and consistent quality.

Product Categories

We Deliver Custom Fastener Solutions In 4 Simple Steps

From your initial inquiry to final delivery, we streamline the entire process to save you time and cost.

01. Requirement Analysis

We work with you to define specifications, materials, and application needs.

02. Design & Quotation

Our engineers create custom drawings and provide a clear, competitive quote.

03. Sample & Production

We produce prototypes for approval, then proceed with full-scale cold heading manufacturing.

04. Quality Check & Delivery

All parts go through strict inspection before being delivered on schedule.

Talk Directly With Our Fastener Experts

Team ready for your project.

Description

Description

Motor Internal Spline Shaft designed for electric tricycle drive systems, ensuring efficient and stable power transmission under demanding operating conditions. The 16-tooth internal spline is formed through a one-step cold heading process, providing high dimensional accuracy, excellent strength, and consistent quality without secondary machining.

Manufactured from 20Cr steel (AISI 5120 equivalent), this Motor Internal Spline Shaft offers superior hardness, wear resistance, and long service life. With an overall dimension of φ27.6 × 165.5 mm and precise internal spline specifications (φ17.2 +0.1 mm × φ15.3 +0.1 mm × 16 mm × 24 mm), it ensures secure engagement, smooth torque transfer, and reliable performance in electric tricycle drive applications.

Material	20Cr (Equiv. AISI 5120)
Overall Dimension	φ27.6㎜*165.5㎜
Main Dimension (Internal Spline)	φ17.2(+0.1)㎜φ15.3(+0.1)㎜16㎜*24㎜

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Frequently Asked Questions About Romy & Our Products

Have Other Questions ?

Get answered by our personal team

Are you a factory or trading company?

We are an integrated manufacturer and trading company. We own an 11,330㎡ production base with complete cold heading equipment and quality inspection systems, offering both factory-direct pricing and professional export services to customers worldwide.

Can you provide customized products?

Absolutely. We specialize in custom non-standard cold-headed fasteners, providing one-stop solutions from mold design and prototype sampling to mass production, based on your drawings, samples, or specific requirements.

What is your delivery time?

Lead time depends on order quantity and product complexity. For standard orders, it is typically 15–30 days. For custom projects, we will provide a clear timeline after confirming your drawings and specifications, ensuring on-time delivery with our daily production capacity of over 1.2 million pieces.

Can you produce custom cold-headed parts based on our drawings?

Yes, we support full customization of dimensions, materials, surface treatments, and special forming requirements. Backed by over 30 years of mold design and cold heading experience, we can quickly turn your drawings into high-quality, mass-produced parts.

What materials do you work with?

We work with a wide range of materials including carbon steel, stainless steel (including magnetic grades), copper, aluminum, and other custom alloys, tailored to your specific strength, corrosion resistance, and application requirements.

How do you control product quality?

We implement full-process quality control from incoming raw material inspection and in-process checks to finished product testing. Supported by our IATF 16949 certified quality management system, we ensure stable and repeatable quality for every batch.