Yufeng Electric · Precision Motor Housings Compact frame solutions for space-constrained applications

Small-Bore Motor Housings

Compact enclosures for miniature and fractional-horsepower motors

Jiangsu Yufeng Electric Co., Ltd. manufactures small-bore motor housings designed for motors with bore diameters under 50 mm. These housings are produced through precision stamping and welding processes, with tight tolerances maintained throughout the manufacturing chain. The small-bore product line serves applications where space is constrained and high-volume production is required. With 40 years of motor housing experience and an annual capacity exceeding 5 million units, Yufeng supplies small-bore housings in customised sizes from 10 mm to 50 mm bore diameter, with wall thicknesses as low as 1.0 mm for weight-sensitive designs.

10–50 mm Bore diameter range

1.0 mm Minimum wall thickness

5M+ Annual production

40 yrs Manufacturing heritage

Precision bore

H7 tolerance on bore diameter with surface finish Ra ≤ 1.6 μm

Thin-wall capability

Wall thickness from 1.0 mm to 2.5 mm for weight reduction

High-volume stamping

Progressive dies maintain consistency across millions of units

Custom configurations

Mounting flanges, slots, and cutouts per customer specification

Product specifications

Bore diameter range	10 mm – 50 mm (custom sizes available)
Bore tolerance	ISO H7 (standard), H6 or custom fits on request
Wall thickness	1.0 mm – 2.5 mm (dependent on material and size)
Overall length	30 mm – 150 mm (custom lengths available)
Material grades	DC01, SPCC, or S235JR
Surface finish (bore)	Ra ≤ 1.6 μm (standard); Ra ≤ 0.8 μm upon request
Concentricity (bore to OD)	≤ 0.08 mm
Surface coating	Zinc phosphate + e-coat (standard); powder or nickel plating optional
Mounting features	Flanges, threaded holes, slots, or keyways as specified

Bore size 10 – 50 mm Tolerance H7 / H6 Wall thickness 1.0 – 2.5 mm Finish Ra ≤ 1.6 μm Coating E-coat / nickel / powder

Engineering & design features

Material optimisation: Thin-wall designs reduce weight without compromising structural integrity for fractional-horsepower applications.
Bearing fit precision: Bore tolerances are held to H7 or better, ensuring consistent interference fits for miniature bearings.
Secondary operations: Flanges, slots, and threaded holes can be integrated into the stamping and machining sequence.
Surface finish control: Bore surfaces are finished to Ra ≤ 1.6 μm to minimise friction and wear on rotating components.

Manufacturing & supply chain

First-pass yield > 98 % on bore dimensions and concentricity (Cpk ≥ 1.67).
Progressive stamping dies optimised for small-bore geometries, reducing material waste.
Material certificates EN 10204 3.1 and bore measurement reports per batch.
Lead time: 12–16 working days for standard sizes; 20–25 days for custom bore dimensions or special coatings.
PPAP level 3 available for automotive and high-volume consumer applications.

Application fields

Fractional-horsepower motors: Small pumps, fans, and blowers used in medical devices, office equipment, and consumer appliances.
Automotive actuators: Throttle control, HVAC dampers, and mirror adjustment motors requiring compact, lightweight housings.
Robotics and automation: Small servo motors and stepping motors for precision motion control systems.
Instrumentation: Motors for analytical instruments, laboratory equipment, and portable power tools.

For custom bore sizes or special tolerance requirements, Yufeng provides bore measurement verification and sample approval prior to mass production.

Engineering support

Frequently asked questions

What is the minimum bore diameter you can produce?

Our stamping and machining capabilities support bore diameters as small as 10 mm. For diameters below 10 mm, we can evaluate on a case-by-case basis using custom tooling.

What bore tolerances can you hold?

We hold ISO H7 as standard for bore diameters. H6 tolerance is available for high-precision applications. For custom fits, we can work to customer-specified tolerances.

Can you produce thin-wall housings for weight-sensitive applications?

Yes. We can reduce wall thickness to 1.0 mm for small-bore housings. Material selection and forming parameters are adjusted to maintain structural integrity while minimising weight.

What secondary features can be integrated into the housing?

We can integrate mounting flanges, threaded holes, slots, keyways, and sensor mounting provisions. These features can be stamped, machined, or welded depending on the design requirement.

What surface coatings are available for small-bore housings?

Standard coating is zinc phosphate plus cathodic e-coat. For enhanced corrosion protection, we offer powder coating, nickel plating, and zinc-rich primers for demanding environments.

For bore measurement reports, custom tolerance specifications, and sample orders, contact the Yufeng engineering team. DFM and bore design feedback are provided within 48 hours for new small-bore housing configurations.

Professional Motor Housing
Manufacturing Solutions

Company Profile

Jiangsu Yufeng Electric Co., Ltd. is a China Small-Bore Motor Housings Manufacturers and Custom Small-Bore Motor Housings Suppliers. Our products are widely used in household appliances, industrial drives, new energy vehicles, and special equipment.

We offer full-process manufacturing capabilities from steel processing to finished product delivery, supported by stamping lines, automated welding equipment, machining facilities, and inspection instruments. Backed by an engineering team with an average of over 20 years of experience, we provide technical support from development to mass production.

With 40 years of focus on motor housing manufacturing, we have served more than 50 customers and achieved an annual production capacity of over 5 million units. Guided by quality, efficiency, and fast response, we are committed to delivering high-precision and high-reliability motor housing solutions.