Pacific Scientific 034STM4-00-200-RS – NEMA 34 Stepper Motor for High‑Torque Positioning

The Pacific Scientific 034STM4-00-200-RS is, in practical terms, a NEMA 34 class stepper motor built for rugged, repeatable motion. The code reads pretty clearly: “034” for the 3.4 in (NEMA 34) frame, “STM4” for a 4‑stack high‑torque body, “200” for 200 full steps/rev (1.8°), and “RS” indicating a rear shaft extension for an encoder, handwheel, or coupling. From my experience, this format is a favorite on packaging axes, index tables, and light gantries where you want solid holding torque without the complexity of a servo loop.

Company’s Order Placement Process and Guarantees

• Warranty period: 365 days
• Delivery time: 1 week for in‑stock; no more than one month at the latest
• Payment method: 50% advance payment, full payment for delivery
• Express delivery: FedEx, UPS, DHL
• Pre‑shipment: visual check of shaft/connector, basic insulation test, ESD‑safe, shock‑resistant packing

Key Features

• NEMA 34 footprint – 86 mm square face makes it a straightforward drop‑in where a 34‑frame motor is specified.
• 4‑stack high‑torque body – Longer rotor stack for higher holding torque; ideal for indexing and load‑holding duties.
• 1.8° step angle (200 steps/rev) – Clean, predictable motion; pairs well with microstepping drives for smoothness.
• Rear shaft (RS) – Convenient for encoder mounting or manual knobs without modifying the driven side.
• Simple cabling – Standard 2‑phase bipolar wiring (A+/A‑, B+/B‑); most stepper drives will run it with minimal tuning.
• Robust bearings – Suited for 24/7 machine duty; in many cases runs for years with only basic checks.

Technical Specifications

Application Fields

You’ll typically see this motor on mid‑torque axes where repeatability matters more than top speed:

• Indexing tables and turntables with hard stops or detents.
• Packaging, labeling, and pick‑and‑place feeders using microstepping for smooth motion.
• Light gantries, dispensers, and metering pumps driven by belt/ball screw stages.
• Retrofits replacing older NEMA 34 motors without changing brackets or couplings.

A technician put it nicely: “We matched the 034STM4 code, set the drive current, and the axis held position rock solid—no hunting, no surprises.”

Advantages & Value

• Reliability – Simple, durable construction that thrives in 24/7 duty when current limits are set correctly.
• Compatibility – Works with most modern stepper drives; NEMA 34 footprint keeps mechanical changes minimal.
• Cost efficiency – In many cases, a stepper delivers the needed torque/holding at lower system cost than a servo.
• Serviceability – Rear shaft eases encoder retrofits; swaps are quick during short maintenance windows.
• Delivery assurance – Clear lead times and tested units help you hit outage targets.

Installation & Maintenance

• Mounting & alignment: Use the NEMA 34 face; align couplings to minimize radial/axial load on bearings.
• Drive setup: Set phase current to the motor’s rating; choose microstep resolution to balance smoothness vs. top speed.
• Wiring: Keep motor leads short where possible; twist pairs (A, B) and maintain proper shielding/grounding for EMC.
• Thermal: Allow airflow around the body; long duty at high current may benefit from a heatsink or lower RMS current.
• Encoder (if used): Mount to the rear shaft; verify counts/rev and direction in the controller before production.
• Routine care: Periodic connector/terminal torque check, dust cleaning, and a quick vibration/temperature scan during PMs.

Quality & Certifications

• Built under Pacific Scientific/Kollmorgen quality systems, typically aligned with ISO 9001.
• CE conformity on relevant variants; many motors are UL Recognized as components.
• RoHS status depends on build generation; we can confirm by nameplate/serial.
• Warranty: 365 days repair/replace coverage from delivery.