KR 120 R3900-2 K vs STEIN 300

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

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Optimized for Agriculture buyers. Priority specs lifted to the top and marked with a target.

KR 120 R3900-2 KAAA

STEIN 300A

Layer 1: Identity & Trust

Manufacturer Country

KR 120 R3900-2 KGermany
STEIN 300Germany

Year First Available

KR 120 R3900-2 K2015
STEIN 300—

Verified Deployments

KR 120 R3900-2 K0 Deployments
STEIN 3000 Deployments

Layer 2: Operational

Price

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

Availability Status

KR 120 R3900-2 KACTIVE
STEIN 300ACTIVE

Arm Mechanics

IP Rating (Arm)

KR 120 R3900-2 KIP65
STEIN 300—

Payload

KR 120 R3900-2 K146 kg
STEIN 30080 kg

Reach

KR 120 R3900-2 K3,904 mm
STEIN 300—

Degrees of Freedom

KR 120 R3900-2 K6
STEIN 300—

Repeatability

KR 120 R3900-2 K±0.04 mm
STEIN 300±0.02 mm

Robot Weight

KR 120 R3900-2 K42 kg
STEIN 300—

IP Rating (Wrist)

KR 120 R3900-2 KIP67
STEIN 300—

Performance

Duty Cycle

KR 120 R3900-2 K—
STEIN 300continuous 24 7

Controller & Programming

Controller Model

KR 120 R3900-2 KKR C5, KR C5 micro
STEIN 300STEIN LOGISTIC system controller

Programming Languages

KR 120 R3900-2 K—
STEIN 300No PLC programming required (drag-and-drop via STEIN CONTROL)

Commercial

Price (USD)

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

Warranty

KR 120 R3900-2 K2 yrs
STEIN 300—

Service Network

KR 120 R3900-2 Kglobal
STEIN 300regional

	KR 120 R3900-2 Kindustrial-armKUKA Robotics AAARobo Index	STEIN 300industrial-armSTEIN Automation ARobo Index
Layer 1: Identity & Trust
Manufacturer Country	Germany	Germany
Year First Available (values differ)	2015	—
Verified Deployments	0 Deployments	0 Deployments
Layer 2: Operational
Price (values differ)	$19,000–$84,900 USD	Contact for quote
Availability Status	ACTIVE	ACTIVE
Layer 3: Category Specific
Arm Mechanics
IP Rating (Arm) (priority for Agriculture buyers) (values differ)	IP65	—
Payload (priority for Agriculture buyers) (values differ)	146 kg	80 kg
Reach (values differ)	3,904 mm	—
Degrees of Freedom (values differ)	6	—
Repeatability (values differ)	±0.04 mm	±0.02 mm
Robot Weight (values differ)	42 kg	—
IP Rating (Wrist) (values differ)	IP67	—
Performance
Duty Cycle (values differ)	—	continuous 24 7
Controller & Programming
Controller Model (values differ)	KR C5, KR C5 micro	STEIN LOGISTIC system controller
Programming Languages (values differ)	—	No PLC programming required (drag-and-drop via STEIN CONTROL)
Commercial
Price (USD) (values differ)	$19,000–$84,900 USD	Contact for quote
Warranty (values differ)	2 yrs	—
Service Network (values differ)	global	regional

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, Vibration Damping, 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, ROS-Industrial Support, IoT / Cloud Platform, Cybersecurity Certs, Predictive Maintenance, Tool Flange Standard, Tool Changer (ISO), Internal Cable Routing, Pneumatic Lines, Electrical Lines, 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.

Robots (fleet)

Hours / day

Labor $/hr (USD)

Days / year

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

Metric	KR 120 R3900-2 K	STEIN 300
Investment	$51,950	No price
Payback period	12.5 mo	—
Net savings (5 yr)	$198,050	—
ROI (5 yr)	+381%	—

STEIN 300 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 300?

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

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

KR 120 R3900-2 K grades AAA on the Robo Index. STEIN 300 grades A. 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 300 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 300?

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 300 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.