SIEMENS 1FK7042-2AF71-1RG0 Servo Motor | Replacement, Equivalent & Selection Guide
The SIEMENS 1FK7042-2AF71-1RG0 is a compact, high-performance permanent-magnet synchronous servo motor from the SIMOTICS S-1FK7 series, designed for demanding motion-control applications in industrial automation. This page provides full technical specifications, verified compatible replacements, and a structured selection guide to help engineers and procurement teams make confident sourcing decisions.
Technical Specifications
- Manufacturer: Siemens AG
- Part Number / SKU: 1FK7042-2AF71-1RG0
- Series: SIMOTICS S-1FK7 (Compact)
- Motor Type: Permanent-Magnet Synchronous Servo Motor
- Rated Speed: 2,000 rpm
- Rated Torque: ~4.0 Nm
- Stall Torque: ~4.8 Nm
- Rated Power: ~0.84 kW
- Voltage Class: 400 V (AC)
- Encoder: Absolute encoder (single-turn / multi-turn, per order code suffix -1RG0)
- Shaft: Smooth shaft (plain, no key)
- Cooling: Natural convection (self-cooled)
- Protection Rating: IP64
- Flange Size: 65 mm
- Weight: ~8 kg
- Compatible Drive: SINAMICS S120 / S110 / V90
Compatible Replacement & Equivalent Models
The following models are functionally compatible or serve as direct/near-direct replacements for the 1FK7042-2AF71-1RG0. Always verify mechanical dimensions, encoder protocol, and drive compatibility before substitution.
- SIEMENS 1FK7042-2AF71-1AA0 — Same frame, incremental encoder variant; suitable when absolute positioning is not required.
- SIEMENS 1FK7042-2AF71-1EG0 — Equivalent with DRIVE-CLiQ encoder interface for direct SINAMICS integration.
- SIEMENS 1FK7044-2AF71-1RG0 — Slightly higher torque (next frame step); drop-in mechanical replacement in most installations.
- SIEMENS 1FK7060-2AF71-1RG0 — Larger frame (80 mm), higher power; use when load torque exceeds 1FK7042 capacity.
- Yaskawa SGMJV-04ADE6S — Cross-brand equivalent (400 W class, 3,000 rpm); requires drive and cable adaptation.
- Mitsubishi HG-KR43 — Cross-brand equivalent (400 W, 3,000 rpm); requires Mitsubishi MR-J4/J5 drive.
Need help confirming compatibility? Contact our technical team at support@konmask.com.
Why Choose the Original Model
- Guaranteed OEM Performance: Factory-rated torque, speed, and thermal characteristics — no derating required.
- Plug-and-Play with SINAMICS: Native encoder protocol eliminates parameterization risk.
- Proven Reliability: 1FK7 series motors are field-proven in millions of machine-tool and packaging installations worldwide.
- Full Siemens Warranty & Support: Eligible for Siemens service contracts and spare-parts programs.
- Regulatory Compliance: CE, UL, and RoHS certified out of the box.
Typical Applications
- CNC machine tools (milling, turning, grinding axes)
- Packaging and labeling machinery
- Textile and printing equipment
- Conveyor and material-handling systems
- Robotics and pick-and-place automation
- Semiconductor and electronics assembly lines
System Compatibility
- Drives: SINAMICS S120, SINAMICS S110, SINAMICS V90
- Controllers: SINUMERIK 840D sl / 828D, SIMOTION D, SIMATIC S7-1500T
- Engineering Software: STARTER, SINAMICS Startdrive (TIA Portal V15+)
- Power Modules: Compatible with S120 Single Motor Module (3 A / 5 A booksize)
Selection Guide
Use the checklist below to confirm the 1FK7042-2AF71-1RG0 is the right choice — or to identify the correct alternative:
- ✅ Torque requirement ≤ 4.0 Nm continuous → 1FK7042-2AF71-1RG0 is suitable.
- ✅ Speed requirement ≤ 2,000 rpm rated / 6,000 rpm max → Confirmed compatible.
- ✅ Absolute encoder required → Suffix -1RG0 confirms absolute encoder. ✓
- ✅ Drive is SINAMICS S120 or V90 → Native compatibility. ✓
- ⚠️ Torque 4–6 Nm → Consider 1FK7044-2AF71-1RG0 (next size up).
- ⚠️ Torque > 6 Nm → Consider 1FK7060 or 1FK7063 series.
- ⚠️ Incremental encoder acceptable → Specify suffix -1AA0 for cost savings.
- ⚠️ DRIVE-CLiQ required → Specify suffix -1EG0 variant.
Quality Assurance & Sourcing
- Source: Authorized distribution channels and verified surplus stock.
- Inspection: Every unit undergoes visual inspection, label verification, and functional check before shipment.
- Authenticity: Holographic Siemens labels and traceable serial numbers verified against Siemens product database where applicable.
- Packaging: Original or equivalent anti-static, shock-resistant packaging.
- Lead Time: In-stock units ship within 1–3 business days; sourced units within 7–15 business days.
How to Order
- Click Add to Cart or Request a Quote on this page.
- Specify quantity and any special requirements (e.g., expedited shipping, certificate of conformance).
- Our team will confirm availability, lead time, and pricing within 24 hours.
- For bulk orders (>5 units) or OEM procurement, email support@konmask.com for volume pricing.
📞 Phone / WhatsApp: +0086 19859288691
📧 Email: support@konmask.com
🌐 Website: https://konmask.com
Replacement & Compatibility FAQ
Q: Can I replace 1FK7042-2AF71-1RG0 with 1FK7042-2AF71-1AA0?
A: Yes, mechanically identical. The -1AA0 uses an incremental encoder; ensure your drive and application support incremental feedback before substituting.
Q: Is the 1FK7042-2AF71-1RG0 compatible with SINAMICS V90?
A: Yes, with the appropriate V90 power rating and cable set. Verify the V90 drive current rating matches the motor’s rated current.
Q: Can I use a third-party servo motor as a replacement?
A: Cross-brand replacements (Yaskawa, Mitsubishi, Fanuc) require drive replacement or adaptation. We recommend OEM replacement for critical axes. Contact us for a full compatibility assessment.
Q: Do you provide a warranty on this product?
A: Yes. All units sold by Konmask.com carry a minimum 90-day warranty against defects. Extended warranty options are available on request.
Q: What is the difference between 1FK7042 and 1FK7044?
A: The 1FK7044 offers a higher stall torque (~6.0 Nm vs ~4.8 Nm) with the same 65 mm flange. It is a direct mechanical drop-in upgrade when more torque is needed.
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