EP-PL/PF Series Standard Precision Planetary Gearbox — Round & Square Flange Inline Output

Korea Ever-Power EP-PL/PF Series
The cost-effective standard planetary gearbox platform covering frame sizes 60 to 160, gear ratios from 3:1 to 512:1, and rated output torque up to 720 N.m. Precision backlash ≤8 arcmin (P1 grade). Available in round flange (EP-PL) and square flange (EP-PF) output configurations. IP54 sealed, 2,000-hour rated life, efficiency ≥96% single-stage. Trusted by CNC, packaging, printing, and automation manufacturers across Korea, Japan, and Southeast Asia.

Category: High Precision Planetary Gearbox

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Description
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EP-PL/PF Series at a Glance

The EP-PL/PF planetary gearbox — also known as a precision planetary reducer — is the broadest-coverage series in the Korea Ever-Power servo planetary gearbox catalogue. Engineered for general-purpose servo and stepper motor applications, it delivers a balance of accuracy, compactness, and value that makes it the default starting point for machine builders worldwide.

Four frame sizes — EP-PL/PF60, EP-PL/PF80, EP-PL/PF120, and EP-PL/PF160 — cover motor power from 50 W compact steppers to 7,500 W heavy-duty servo drives. One-stage, two-stage, and three-stage configurations provide 22 standard gear ratios from 3:1 through 512:1, all manufactured in our Ansan-si precision gear facility using 5-axis CNC hobbing and grinding processes.

Both round flange (EP-PL) and square flange (EP-PF) output variants share identical internal gear trains, bearings, and seals — the only difference is the output housing geometry. This lets you standardise on one gearbox platform across machines that require different mounting interfaces.

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EP-PL/PF Series Standard Precision Planetary Gearbox - round flange and square flange inline output

≤8′

Backlash (P1)

720

N.m Max Torque

≥96%

Efficiency (1-stg)

Available Frame Sizes — From Compact to Heavy-Duty

The EP-PL/PF planetary gearbox range spans four frame sizes. Each planetary reducer frame is designed around a specific motor power band, with bearing capacity and gear module scaled accordingly. Selecting the correct frame ensures optimal load distribution across the planet gears and output bearings, maximising the planetary gearbox service life and positional accuracy.

EP-PL60 Series Planetary Gearbox Dimension

EP-PF60 Series Planetary Gearbox Dimension

Frame 60

EP-PL60 · EP-PF60

▶ Motor power: 50–750 W
▶ Rated torque: 13–40 N.m
▶ Weight: 0.9–1.3 kg
▶ Flange: □60×60 / ∅60

Ideal for compact stepper-driven indexing tables, small packaging machines, and label applicators.

Frame 80

EP-PL80 · EP-PF80

▶ Motor power: 100–750 W
▶ Rated torque: 27–110 N.m
▶ Weight: 2.2–3.2 kg
▶ Flange: □80×80 / ∅70

The most popular frame for general-purpose CNC feed axes, cartesian robots, and printing machinery.

Frame 120

EP-PL120 · EP-PF120

▶ Motor power: 200–2,000 W
▶ Rated torque: 63–220 N.m
▶ Weight: 7.6–10.4 kg
▶ Flange: □120×120 / ∅100

Mid-range workhorse for automated assembly lines, textile winding machines, and woodworking routers.

Frame 160

EP-PL160 · EP-PF160

▶ Motor power: 400–7,500 W
▶ Rated torque: 320–720 N.m
▶ Weight: 23–36 kg
▶ Flange: □160×160 / ∅145

Heavy-duty platform for large CNC machining centres, press feed lines, and material-handling gantries.

Technical Specifications

The following performance data applies to both EP-PL (round flange) and EP-PF (square flange) models within the same frame size. All torque values are measured at the output shaft with input speed of 3,000 rpm. Backlash is tested at 2% of rated torque.

EP-PL/PF(60) Performance Parameter Table

Stage	Ratio	Rated Torque (N.m)	Emergency Stop Torque (N.m)	Moment of Inertia (Kgcm²)	Motor Power (W)	Output Speed (rpm)	Output Torque (N.m)
1	3	30	60	0.135	400	1000	3.67
	4	40	80	0.093	400	750	4.89
	5	37	74	0.078	400	600	6.11
	8	18	36	0.065	400	375	9.78
	10	13	26	0.054	400	300	12.22
2	9	30	60	0.131	400	333.33	10.77
	20	40	80	0.075	400	150	19.15
	40	37	74	0.064	200	75	23.94
3	100	40	80	0.075	100	30	28.65
3	512	18	36	0.064	(3)	5.86	≤18

Stage	Noise	Precision Backlash	Standard Backlash	Life	Efficiency	Torsional Stiffness	Protection	Weight
1	≤58 dB(A) (at 5m)	≤8 arcmin	—	2,000 h	≥96%	2.3 N.m/arcmin	IP54	0.9 kg
2		≤12 arcmin			≥94%			1.1 kg
3		≤15 arcmin			≥90%			1.3 kg

(1) Torque values are based on motor parameter; type-selection per motor power table. (2) Usage torque ≤ Rated torque. (3) Radial and axial force measured at output distance 100 rpm. (4) Noise level at input speed 3,000 rpm, 1 m distance. (5) Backlash tested at 2% of rated torque. Frame 80, 120, and 160 performance tables available upon request.

Round Flange vs Square Flange — Which Fits Your Machine?

Both the EP-PL and EP-PF planetary gearbox variants share identical gear trains, bearings, seals, and internal precision. The only difference between these two planetary reducer models is the output housing: EP-PL provides a round bolt-circle flange, while EP-PF provides a square flange. Your choice depends entirely on the mating interface of your machine frame or load mechanism.

EP-PL_PF Series Standard Precision Planetary Gearbox 1

EP-PL — Round Flange

◆ Output face: circular bolt-circle pattern
◆ Centering: spigot (pilot) diameter
◆ Typical use: rotary tables, turntable drives, conveyor rollers
◆ Advantage: easy angular alignment, forgiving on bolt hole tolerances
◆ Industry preference: Japan, Korea, automation OEMs

EP-PF — Square Flange

◆ Output face: square corner-bolt pattern
◆ Centering: square register fit
◆ Typical use: linear motion axes, rack-and-pinion drives, ball-screw mounts
◆ Advantage: anti-rotation by geometry, higher moment resistance
◆ Industry preference: Europe, CNC machine tool builders

Not sure which flange type to specify? Our application engineers can confirm the correct variant based on your motor model and machine drawings. For applications requiring ≤5 arcmin backlash with IP65 sealed protection, consider upgrading to our EP-PBL/PBF high precision planetary gearbox.

Gear Ratio & Stage Configuration

The EP-PL/PF precision planetary gearbox is available in one-stage, two-stage, and three-stage configurations. Adding stages to the planetary reducer extends the available ratio range but reduces overall efficiency and increases axial length. The chart below illustrates the trade-offs across each planetary gearbox stage configuration.

RATIO RANGE & EFFICIENCY BY STAGE

3–10

Ratio Range

η ≥ 96%

Noise ≤58 dB(A)

1-STAGE

9–64

Ratio Range

η ≥ 94%

Noise ≤60 dB(A)

2-STAGE

60–512

Ratio Range

η ≥ 90%

Noise ≤65 dB(A)

3-STAGE

Taller bar = wider ratio range. Darker shade = higher mechanical efficiency. Select the minimum number of stages that covers your required ratio.

As a general rule, single-stage planetary gearbox reductions (3:1 through 10:1) should be specified wherever the required ratio falls within this range, as they deliver the highest efficiency and lowest backlash accumulation. Two-stage planetary reducer units extend coverage to 64:1 with only a modest 2% efficiency reduction. Three-stage configurations are reserved for extreme reduction needs above 64:1, typically found in indexing mechanisms and very slow rotary actuators where a compact precision planetary gearbox is essential.

Application Industries

The EP-PL/PF precision planetary gearbox serves as the backbone of servo motion control across a wide range of manufacturing sectors. This inline planetary reducer combines compact dimensions, configurable ratios, and cost efficiency, making it the default choice for OEM machine builders looking to standardise their planetary gearbox drive-train platform.

EP-PL/PF planetary gearbox application in CNC machine tools and industrial automation

⚙ CNC Machine Tools

Feed-axis drives, tool changers, and rotary indexing tables. Frame 80 and 120 are most specified.

⚙ Packaging Machinery

Filling, capping, labelling, and carton-forming machines requiring smooth low-backlash motion.

⚙ Printing Equipment

⚙ Semiconductor & Electronics

Pick-and-place arms, wafer handlers, and PCB assembly actuators. Frame 60 preferred for compactness.

⚙ Textile Machinery

Winding, warping, and loom drive systems. Frame 120 and 160 handle the sustained torque demands.

⚙ Automation & Robotics

Cartesian gantry axes, SCARA base drives, and conveyor positioning. Pair with a precision drive shaft for articulating load connections.

Why Choose Korea Ever-Power

1
Korean Precision Manufacturing
Every EP-PL/PF gearbox is manufactured at our Ansan-si facility under ISO 9001 quality management. 5-axis CNC gear hobbing and grinding deliver consistent tooth profiles across every production batch.
2
100% Backlash-Tested Before Shipping
Every unit undergoes full-load backlash verification at our test centre. No statistical sampling — every single gearbox is confirmed to meet P1 or P2 grade before packing.
3
24-Hour Engineering Response
Send your motor model, required ratio, and duty cycle. Our application engineers return a confirmed selection with pricing within one business day.
4
OEM/ODM Customisation
Custom output shafts, special ratios, modified housing, and private-label services available. We confirm feasibility in the same 24-hour response window.
5
Broad Servo Motor Compatibility
Compatible with Mitsubishi, Panasonic, Yaskawa, Siemens, Delta, and other servo brands through our 6 input coupling options (OP1–OP6).

Korea Ever-Power planetary gearbox CNC gear grinding workshop in Ansan-si

Ever-Power precision gearbox backlash testing centre

Complementary Products & Ecosystem

Korea Ever-Power complementary products - planetary gearbox, drive shaft, agricultural gearbox, worm reducer

The EP-PL/PF planetary gearbox integrates seamlessly with other Korea Ever-Power product lines, enabling complete drive-train solutions from a single supplier:

◆ EP-WPL/WPF Series — Right-angle 90° output variant of this platform for space-constrained installations where the motor axis must be perpendicular to the load axis.
◆ EP-PBL/PBF Series — High precision upgrade (≤5 arcmin, IP65) for semiconductor, laser, and medical equipment applications that demand tighter positional accuracy.
◆ EP-HAB Series — Ultra-precision planetary gearbox (≤3 arcmin) with the highest torsional stiffness in the portfolio, designed for CNC machining centres and industrial robotics.
◆ Agricultural Gearbox — Heavy-duty right-angle and inline gearboxes for farming equipment, tillage machinery, and off-highway applications.
◆ Worm Gear Reducer — Self-locking worm gearbox solutions for conveyor drives, hoisting equipment, and applications requiring holding torque without a brake.

What Our Customers Say

★★★★★

“We switched our CNC feed-axis gearboxes from a Japanese brand to EP-PL80 units last year. Backlash is within spec at P1 grade, delivery was 10 days to Daejeon, and per-unit cost dropped by 35%. Already placed a repeat order for our new machining centre line.”

Mr. Kim, Chief Engineer — Daejeon, Korea · CNC Machine Tools

★★★★★

“What impressed us most is the low noise level. Our EP-PF120 units run noticeably quieter than the previous European gearboxes. After 14 months of three-shift operation on our carton-forming line, zero failures so far.”

Tanaka Manufacturing — Osaka, Japan · Packaging Machinery

★★★★☆

“Good value for the price point. We use EP-PL60 on our PCB pick-and-place modules. Precision meets our ≤8 arcmin requirement consistently. Would be perfect with an IP65 option — looking at the PBL series for our next cleanroom project.”

Chen Automation — Suzhou, China · Semiconductor Equipment

★★★★★

“We tested EP-PF160 planetary gearboxes against two established European brands on our servo press brake back-gauge axis. Positioning repeatability was identical, but the Ever-Power units arrived three weeks faster and the total procurement cost was 40% lower. Now specified as standard across all our new press lines.”

Mr. Park, Procurement Manager — Changwon, Korea · Metal Forming Equipment

★★★★★

“Our textile winding machines run EP-PL120 reducers at 16:1 ratio across three production shifts. Eighteen months in service with zero backlash drift. The OP4 reinforced coupling handles the constant reversing without any loosening. Very satisfied with the consistency batch to batch.”

Nguyen Industrial — Ho Chi Minh City, Vietnam · Textile Machinery

Frequently Asked Questions

▶ What is the difference between EP-PL and EP-PF planetary gearbox?

The EP-PL and EP-PF share identical internal gear trains, bearings, seals, and performance specifications. The only difference is the output flange geometry: EP-PL has a round bolt-circle flange suited for rotary applications, while EP-PF has a square corner-bolt flange preferred for linear-motion and rack-and-pinion installations. Select based on the mating interface of your machine frame or load mechanism.

▶ How do I select the correct EP-PL/PF frame size for my servo motor?

Frame selection is primarily determined by three factors: motor shaft diameter, required output torque, and motor power. Each frame covers a specific motor shaft range (Frame 60: 6–19 mm, Frame 80: 8–22 mm, Frame 120: 14–35 mm, Frame 160: 19–42 mm). Verify that your motor’s shaft diameter falls within the frame’s compatible range, then confirm the required output torque does not exceed the rated torque for your chosen ratio. Our engineers can confirm the selection within 24 hours if you send your motor model number to [email protected].

▶ Can the EP-PL/PF gearbox handle frequent reversing applications?

Yes. For applications with frequent CW/CCW reversals, specify the OP4 reinforcement integral hoop clamp coupling instead of the standard OP1. The OP4 coupling features a reinforced clamping structure specifically designed for the cyclic loading pattern of reversing duty. This is common in servo press drives, oscillating conveyors, and pick-and-place reciprocating axes.

▶ What is the maximum input speed for the EP-PL/PF series?

The EP-PL/PF series is rated for a maximum input speed of 3,000 rpm for continuous operation. Short-duration peak speeds up to 6,000 rpm are permissible on single-stage units during acceleration and deceleration phases. Noise levels and bearing temperatures should be monitored if sustained operation above 3,000 rpm is planned. For applications requiring higher sustained input speeds, consider the EP-HAB high rigidity planetary gearbox series which offers enhanced bearing capacity and torsional stiffness.

▶ Does Korea Ever-Power offer custom shaft and coupling configurations?

Yes. The EP-PL/PF series supports six input coupling types: OP1 (integral hoop clamp, standard), OP2 (split type hoop clamp), OP3 (integral with keyway), OP4 (reinforced for frequent reversing), OP5 (keyway only), and OP6 (custom adaptor). Output shafts are available in S1 (smooth), S2 (keyed), and T (custom specification). Contact our engineering team with your motor model and load requirements for a tailored recommendation.

▶ How does the EP-PL/PF compare to the EP-PBL/PBF high precision series?

The EP-PL/PF delivers ≤8 arcmin backlash (P1 grade) with IP54 protection, while the EP-PBL/PBF achieves ≤5 arcmin with IP65 sealing. Internal gear quality, bearing class, and torsional stiffness are also upgraded in the PBL/PBF series. If your application tolerates ≤8 arcmin and does not require washdown or dust-proof protection, the EP-PL/PF offers significant cost savings. For semiconductor, laser, or medical applications where ≤5 arcmin and environmental sealing are mandatory, the EP-PBL/PBF high precision planetary gearbox is the recommended upgrade path.

Specify Your EP-PL/PF Planetary Gearbox

Send us your motor model, required ratio, output torque, and duty cycle. Our engineers will confirm the optimal EP-PL or EP-PF variant, frame size, and backlash grade within one business day.

Contact Our Application Engineers →