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KR 120 R3900-2 K vs STEIN 300e

Side-by-side comparison of KR 120 R3900-2 K (KUKA Robotics) and STEIN 300e (STEIN Automation) — specs, pricing, Robo Index, and verified deployments. Updated daily.

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KR 120 R3900-2 K
KR 120 R3900-2 KAAA
STEIN 300eBBB

Layer 1: Identity & Trust

Manufacturer Country

  • KR 120 R3900-2 K
    KR 120 R3900-2 KGermany
  • STEIN 300eGermany

Year First Available

  • KR 120 R3900-2 K
    KR 120 R3900-2 K2015
  • STEIN 300e—

Verified Deployments

  • KR 120 R3900-2 K
    KR 120 R3900-2 K0 Deployments
  • STEIN 300e0 Deployments

Layer 2: Operational

Price

  • KR 120 R3900-2 K
    KR 120 R3900-2 K$19,000–$84,900 USD
  • STEIN 300eContact for quote

Availability Status

  • KR 120 R3900-2 K
    KR 120 R3900-2 KACTIVE
  • STEIN 300eACTIVE

Arm Mechanics

Repeatability

  • KR 120 R3900-2 K
    KR 120 R3900-2 K±0.04 mm
  • STEIN 300e—

IP Rating (Arm)

  • KR 120 R3900-2 K
    KR 120 R3900-2 KIP65
  • STEIN 300e—

Reach

  • KR 120 R3900-2 K
    KR 120 R3900-2 K3,904 mm
  • STEIN 300e—

Payload

  • KR 120 R3900-2 K
    KR 120 R3900-2 K146 kg
  • STEIN 300e80 kg

Degrees of Freedom

  • KR 120 R3900-2 K
    KR 120 R3900-2 K6
  • STEIN 300e—

Robot Weight

  • KR 120 R3900-2 K
    KR 120 R3900-2 K42 kg
  • STEIN 300e—

IP Rating (Wrist)

  • KR 120 R3900-2 K
    KR 120 R3900-2 KIP67
  • STEIN 300e—

Performance

Duty Cycle

  • KR 120 R3900-2 K
    KR 120 R3900-2 K—
  • STEIN 300econtinuous 24 7

Vibration Damping

  • KR 120 R3900-2 K
    KR 120 R3900-2 K—
  • STEIN 300epassive

Controller & Programming

Controller Model

  • KR 120 R3900-2 K
    KR 120 R3900-2 KKR C5, KR C5 micro
  • STEIN 300eSTEIN CONTROL

Programming Languages

  • KR 120 R3900-2 K
    KR 120 R3900-2 K—
  • STEIN 300eNo PLC programming required (drag-and-drop via STEIN CONTROL)

Connectivity

ROS-Industrial Support

  • KR 120 R3900-2 K
    KR 120 R3900-2 K—
  • STEIN 300enone

Predictive Maintenance

  • KR 120 R3900-2 K
    KR 120 R3900-2 K—
  • STEIN 300ethreshold based

End-Effector

Internal Cable Routing

  • KR 120 R3900-2 K
    KR 120 R3900-2 K—
  • STEIN 300ethrough arm

Pneumatic Lines

  • KR 120 R3900-2 K
    KR 120 R3900-2 K—
  • STEIN 300e0

Electrical Lines

  • KR 120 R3900-2 K
    KR 120 R3900-2 K—
  • STEIN 300e1

Commercial

Price (USD)

  • KR 120 R3900-2 K
    KR 120 R3900-2 K$19,000–$84,900 USD
  • STEIN 300eContact for quote

Warranty

  • KR 120 R3900-2 K
    KR 120 R3900-2 K2 yrs
  • STEIN 300e—

Service Network

  • KR 120 R3900-2 K
    KR 120 R3900-2 Kglobal
  • STEIN 300eregional

Insufficient data for full comparison

The following fields had no data for any of the selected robots: Battery / Shift Runtime, Path Accuracy, Max TCP Speed, Cycle Time (25/305/25), MTBF, Safety Category, Dual Check Safety, Safety I/O Pairs, E-Stop Response, Safe Zone Count, Teach Pendant Type, Offline Programming, Digital Twin Support, Communication Protocols, IoT / Cloud Platform, Cybersecurity Certs, Tool Flange Standard, Tool Changer (ISO), Spare Parts Lead Time, Expected Service Life

best in categoryweakest in categoryvalues differ

ROI Comparison

Same operating assumptions across every robot — the only difference is price. Set your numbers once to see which pays back fastest.

Annual labor displaced (per robot): $50,000

MetricKR 120 R3900-2 KSTEIN 300e
Investment$51,950No price
Payback period12.5 mo—
Net savings (5 yr)$198,050—
ROI (5 yr)+381%—

STEIN 300e has no listed price, so payback can't be computed. Contact the manufacturer for a quote.

Estimates labor-cost displacement only — not a full total cost of ownership. Actual ROI depends on integration, maintenance, training, downtime, and task fit. Converted currencies are indicative; USD is the price of record.

Trade-offs at a glance

Frequently asked

Who makes KR 120 R3900-2 K and STEIN 300e?

KR 120 R3900-2 K is made by KUKA Robotics, based in DE. STEIN 300e is made by STEIN Automation, based in DE.

How do KR 120 R3900-2 K and STEIN 300e compare on the Robo Index?

KR 120 R3900-2 K grades AAA on the Robo Index. STEIN 300e grades BBB. The Robo Index is a credibility grade (AAA … C) that blends commercial maturity, verified deployments, company standing, and independent coverage — see methodology for the full breakdown.

Are KR 120 R3900-2 K and STEIN 300e in the same category?

Both robots are classified as Industrial Arm on Robolist. Filters and ranking treat them as direct alternatives.

What is the realistic total cost of ownership for Industrial Arm robots?

Hardware cost is one input. Industrial Arm TCO also includes integration, training, downtime, and end-of-life. Our breakdown: TCO of a 6-Axis Arm Cell: Hardware, EOAT, Integration, Programming.

What should a buyer ask vendors when choosing between KR 120 R3900-2 K and STEIN 300e?

Spec sheets only show part of the story. Useful vendor questions cover support, lifecycle, integration cost, and references. We have a buyer-focused checklist: Industrial Arm Vendor Selection: Capability Matrices and Proof Points.

Going deeper — picking the right robot

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About this comparison

KR 120 R3900-2 K vs STEIN 300e compares two robots in the industrial-arm category. All data is sourced from manufacturer spec sheets, verified deployments, and third-party filings; see our methodology for how the Robo Index is calculated.