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Siemens 1FK7042-5AF71-1FH2 SIMOTICS S Synchronous Servo Motor

Siemens 1FK7042-5AF71-1FH2 SIMOTICS S Synchronous Servo Motor

Item NO.: 3745420
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Detail

  • Product NameSiemens 1FK7042-5AF71-1FH2 SIMOTICS S Synchronous Servo Motor
  • Item NO.3745420
  • Weight5.0000 kg = 11.0231 lb = 176.3698 oz
  • CategoryPLC
  • BrandSiemens
  • Creation Time2026-08-24
  • 1FK7 Series · High Dynamic
Siemens 1FK7042-5AF71-1FH2 | SIMOTICS S Servo Motor

1FK7042-5AF71-1FH2

SIMOTICS S Synchronous Servo Motor Siemens 0.82 kW · 3000 rpm
1FK7 Series · High Dynamic
Overview Specifications Features Applications Lifecycle FAQ Recommended Models

Overview

1FK7042-5AF71-1FH2 is a permanent-magnet excited synchronous servo motor from Siemens' SIMOTICS S-1FK7 series, designed for high-performance motion control applications. It belongs to the High Dynamic variant of the 1FK7 family, optimized for applications requiring rapid acceleration and precise positioning.

The motor delivers a rated power of 0.82 kW and a rated torque of 2.6 Nm at a rated speed of 3000 rpm. It features a compact 1FK7042 frame size with natural air cooling, an 8-pole design, and a plain shaft with keyway.

The 1FK7042-5AF71-1FH2 is typically paired with SINAMICS S120 or SINAMICS G120 drives. It offers an IP64 degree of protection (with IP65 at the drive-end flange), making it suitable for industrial environments.

SIMOTICS S-1FK7 0.82 kW 3000 rpm 2.6 Nm IP64/IP65
Key details
  • Siemens SIMOTICS S-1FK7
  • High Dynamic synchronous servo motor
  • 0.82 kW rated power
  • 3000 rpm rated speed
  • 2.6 Nm rated torque

Specifications

Performance specifications

Manufacturer Siemens
Model 1FK7042-5AF71-1FH2
Series SIMOTICS S-1FK7
Motor type Permanent-magnet synchronous servo motor
Rated power 0.82 kW
Rated speed 3000 rpm
Static torque (M0) 3.0 Nm
Rated torque 2.6 Nm
Rated current 1.95 A
Poles 8
Rotor moment of inertia 3.01 × 10⁻⁴ kg/m²
Country of origin Germany

Physical & environmental

Frame size 1FK7042
Degree of protection IP64 (IP65 at drive-end flange)
Shaft end Plain shaft with fitted key
Shaft length 48 mm
Shaft diameter 19 mm
Cooling method Natural convection
Mounting configuration IM B5 (IM V1, IM V3)
Power connector Rotatable
Standards/approvals RoHS
Paint finish RAL7016
Operating temperature 0°C to +40°C
Note: The 1FK7042-5AF71-1FH2 is a High Dynamic variant with resolver feedback.

Features

Performance & design

  • High dynamic response — Optimized for rapid acceleration and precise positioning in demanding motion control applications.
  • Permanent-magnet synchronous technology — Provides high efficiency (up to 89%) and excellent overload capability.
  • Natural air cooling — Self-cooled design eliminates the need for external cooling fans.

Flexibility & connectivity

  • Rotatable connectors — Power and signal connectors can be rotated up to 270° for flexible cable routing.
  • Resolver feedback — Equipped with resolver for precise position and speed feedback.
  • Multiple mounting orientations — Supports IM B5 (IM V1, IM V3) mounting.

Applications

The 1FK7042-5AF71-1FH2 is widely deployed in industrial automation applications requiring high-precision motion control.

Machine tools
Robotics & handling systems
Packaging machinery
Printing & paper machines
Textile machinery
Material processing
Positioning systems
Conveyor systems
Typical industries: Industrial manufacturing, automotive, aerospace, and general motion control applications.
Key applications: The 1FK7042-5AF71-1FH2 is ideal for high-dynamic positioning tasks when paired with SINAMICS S120 or SINAMICS G120 drives.

Lifecycle

Active currently in production — fully supported

Product status: The 1FK7042-5AF71-1FH2 remains an active, supported product in Siemens' SIMOTICS S portfolio. It continues to be a recommended servo motor solution for new SINAMICS drive installations.

Spare parts & support: Replacement units and accessories are available through Siemens' standard support channels and authorized distributors. The 1FK7 series is designed for long‑term availability.

Replacement & migration:

Migration considerations: When replacing a 1FK7042 motor, verify the following to ensure compatibility:
  • Confirm the drive compatibility (SINAMICS S120, G120, or SIMODRIVE 611).
  • Verify the feedback system type (resolver, encoder, or DRIVE-CLiQ).
  • Check the degree of protection (IP64/IP65) and paint finish specifications.
Related models: 1FK7042-2AF71-1RH2, 1FK7042-5AF21-1PA3, 1FK7042-2AF21-1TA3, 1FK7042-2AF71-1QG0

Recommendation: For new SINAMICS drive installations, the 1FK7042-5AF71-1FH2 remains a reliable and cost-effective servo motor solution.

FAQ – Frequently Asked Questions

Q1: What is the rated power of the 1FK7042-5AF71-1FH2?

It has a rated power of 0.82 kW .

Q2: What is the rated speed and torque?

It operates at 3000 rpm with a rated torque of 2.6 Nm .

Q3: What is the degree of protection?

The motor offers IP64 protection, with IP65 at the drive-end flange.

Q4: Is the 1FK7042-5AF71-1FH2 compatible with SINAMICS G120?

Yes, it is compatible with SINAMICS G120, S120, and other Siemens drive families.

Q5: What type of feedback does this motor use?

It is equipped with a resolver for position and speed feedback.

Q6: Does the 1FK7042-5AF71-1FH2 include a holding brake?

The standard model is supplied without a holding brake.

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