Stepped Motor Shaft

-- Steady & Reliable Manufacturer --

A stepped motor shaft features two or more precision-turned diameters machined from a single blank, creating distinct shoulders that serve as axial locating faces for bearings, gears, pulleys, and retaining rings. This design eliminates the need for separate spacers or collars, reducing part count and assembly time.

Fenglan manufactures stepped shafts to customer drawings with shoulder runout held to within 0.01 mm. Standard step transitions are sharp (0.5 mm undercut) or radiused (R0.5–R3) per drawing. Materials range from 45# carbon steel for general drives to 316 stainless for corrosive environments.

Specification

Material	45# carbon steel, 40Cr, 304/316 stainless steel, 6061-T6 aluminum
Min / Max Diameter per Step	4 mm (smallest step) to 120 mm (largest step)
Number of Steps	2 to 8 steps per shaft
Length	50 mm – 2,000 mm
Shoulder Runout	≤ 0.01 mm TIR
Step Transition	Sharp undercut (0.5 mm) or radius R0.5–R3 per drawing
Diameter Tolerance	h6 on bearing seats; h8 on non-critical steps
Surface Finish (bearing seats)	Ra 0.8 μm centerless ground
Secondary Ops	Keyway, thread, cross-hole, snap-ring groove, induction hardening
MOQ	10 pcs; 1 pc prototype

Application

Stepped motor shafts are specified wherever multiple components must be axially located on a single rotating member:

Electric motor rotors — bearing seats at both ends with a rotor-stack seating diameter in between
Gearbox input/output shafts — separate shoulders for bearing, gear, and seal positions
Pump shafts — impeller seat + mechanical seal seat + bearing journal on one shaft
Conveyor drive shafts — sprocket and bearing mounts at fixed axial positions
Power tool armature shafts — commutator, bearing, and pinion gear on distinct diameters
Servo and stepper motor shafts — encoder coupling and load coupling at different diameters

Advantage

One-piece construction — eliminates spacers, sleeves and collars; reduces component count and assembly error
Precise shoulder location — runout ≤ 0.01 mm ensures accurate bearing and gear seating
Flexible step configuration — up to 8 distinct diameters from a single machining setup
Drawing-matched tolerances — bearing seats to h6; gear bores to k6/m6 as required
Broad material choice — carbon steel, alloy steel, stainless, aluminum per application requirements
Combined operations in-house — turning, grinding, keyway, and heat treat without sub-contracting delays

Payment & Shipping

We accept T/T (bank transfer), L/C at sight, PayPal (samples), and Western Union. A 30% deposit is required to confirm production, with the balance paid before shipment.

Standard lead time is 7–15 business days for regular orders; prototype samples ship within 3–5 days. We ship worldwide via DHL, FedEx, UPS, sea freight (FCL/LCL), and air freight. FOB Changzhou and CIF terms are both available. All goods are packed in export-standard cartons with foam padding or wooden crates for heavy items. A commercial invoice, packing list, and COA are provided with every shipment. For large OEM orders, customized packaging and private-label options are available upon request.

Q: How many diameter steps can you machine on one shaft?
A: We regularly produce shafts with 2 to 8 distinct diameters. Beyond 8 steps the setup complexity increases; contact us with your drawing for a feasibility assessment.

Q: What runout tolerance can you hold at the shoulders?
A: Standard shoulder runout is ≤ 0.01 mm TIR. For high-speed spindle applications we can tighten this to ≤ 0.005 mm with in-process gauging.

Q: Can you grind specific bearing-seat diameters after turning?
A: Yes. Bearing-seat diameters are centerless or cylindrically ground to Ra 0.8 μm (Ra 0.4 μm on request) after rough turning, ensuring the geometry required for press or slip fits.

Q: Do you offer stepped shafts with integral threads?
A: Yes. Metric and UNC/UNF threads can be turned onto one or both ends of a stepped shaft as part of the same machining operation.

Changzhou Fenglan New Materials Co., Ltd.

ABOUT US

Quality is Our Core Competitiveness

Changzhou Fenglan New Materials Co., Ltd.

Founded in 2010, As China Stepped Motor Shaft Manufacturers and Stepped Motor Shaft Company. we are dedicated to manufacturing precision parts for automotive, industrial, and electrical applications. Backed by advanced manufacturing and R&D, we provide high-quality products and trusted solutions to our clients. We provide a wide selection of components to meet diverse industry needs: Electric Shafts: Drive shafts, coil motor shafts, servo motor shafts, water pump motor shafts, industrial motor shafts, and magnetic levitation motor shafts. Hardware: Precision parts for medical equipment, water heater coils, plumbing fittings, and various gas springs. Our commitment is to support our customers with reliable performance and long-term value.

We look forward to working with you

With a strong R&D team, we are ready to take on challenges and bring creative ideas to the market.

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