WPKA Series Worm Gearbox

WPKA Series Worm Gearbox

The WPKA Series is an EVER-POWER single stage worm gearbox manufactured in Hangzhou and supplied factory-direct from Singapore. Gear ratios 1:5 – 1:60, max output torque 2,745 N·m, efficiency 60-82%. Input: Solid shaft. Output: Hollow bore shaft. Mounting: Foot mounted. Centre distance 40-250 mm. 20CrMnTi worm hardened to HRC 58-62. ISO 9001:2015 and CE certified. MOQ 10 pcs. Sample in 15-25 days. 24 h quote response.

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WPKA Series Worm Gearbox
ISO 9001:2015
CE

Input
Solid shaft
Horizontal

Output
Hollow bore shaft
H7 tolerance

Ratio
1:5 – 1:60
Single stage

Max Torque
2,745 N·m
Size 250

Mounting
Foot mounted
40–250 mm

⚙
1:5 – 1:60
Gear Ratio
⚡
60–82%
Efficiency
🔩
2,745 N·m
Max Output Torque
🛡
HRC 58–62
Gear Hardness
📐
40–250 mm
Centre Distance

01
Product Overview
WPKA Series Worm Gearbox — Technical Overview

The WPKA Series Worm Gearbox delivers torque through a hollow bore output shaft rather than a solid shaft. The driven machine shaft slides directly into the hollow bore and is secured with a standard key and keyway, eliminating the coupling, coupling guard, and alignment step that a solid-shaft arrangement requires.

Solid horizontal input shaft, integral HT250 cast iron housing (P-type), foot mounted. 20CrMnTi worm shaft hardened to HRC 58–62, ZCuSn10Pb1 bronze wheel, 60–82% efficiency. Hollow bore machined to H7 tolerance. Leak-tested to 2.5 bar and pre-filled with ISO VG220.

Factory-direct from Singapore. See the full single stage worm gearbox family or request a quotation.

WPKA worm gear reducer internal structure and component diagram

WP Series Worm Gear Reducer — Internal Structure and Main Components

02
Shaft Direction
WPKA Series — Input and Output Shaft Orientations
Multiple shaft direction positions are available. Specify the position code when ordering. Oil fill volume changes with non-standard orientations — EVER-POWER confirms the required adjustment.

WPKA worm gear reducer shaft direction diagram — input and output shaft orientation positions

WPKA Series — Shaft Direction Diagram · A: input below · S: input above · O: output upward · X: output downward · T: input upward · V: input downward

Code Input Shaft Position Output Shaft Position Typical Use
A Horizontal — below centre (standard) Horizontal Horizontal conveyor drives, standard floor-mounted machines
S Horizontal — above centre Horizontal Overhead mounting, inverted or top-fed drives
O Horizontal Vertical — upward Lifting columns, vertical screw drives, hoist applications
X Horizontal Vertical — downward Gravity-assisted feed, downward discharge drives
T Vertical — upward Horizontal Vertical input from above, tower or mast drives
V Vertical — downward Horizontal Floor-level motor with downward vertical input shaft
ℹ Hollow Bore Output — WPKA Series
The WPKA hollow bore output accepts the driven machine shaft directly with a standard key-and-keyway connection (H7 bore tolerance). This eliminates the coupling, reduces overall transmission length, and removes the need for shaft alignment equipment at installation. The bore is available in standard sizes for each centre distance; non-standard bore diameters are available as OEM options.

03
Dimensional Drawing
WPKA Series — Overall Dimensions and Mounting Geometry
Full dimensional data covering 40–250 mm centre distance range. 2D DXF and PDF drawings available within 24 hours at no charge.

WPKA worm gear reducer dimensional drawing — overall dimensions mounting hole pattern and shaft sizes

WPKA Series — Structural Dimensional Drawing · All dimensions in mm · Sizes 40–250 mm · DXF and PDF on request within 24 hours

Dimension Symbol Reference
A / AB Overall length / length excluding shaft extension B / BB Overall height / base plate height
CC Output shaft centreline height above base HS / U Input shaft diameter / usable shaft length
T x V Input shaft key width x key depth LS / S Output shaft usable length / diameter
W x Y Output shaft key width x key depth E / F / G / M / N Foot mounting hole positions and pitch

04
Specifications
WPKA Series — Full Parameter Table
Input speed: 1,500 r/min · Housing: HT250 cast iron · Seal: NAK / SKF · Lubricant: ISO VG220 · MOQ: 10 pcs · Port: Shanghai / Ningbo

WPKA worm gear reducer specification table — input power and output torque for all sizes and ratios (brochure p.11)

WPKA Series — Parameter Table (brochure p.11) · Columns: Size · Ratio · A/AB/B/BB/CC/H/HL/M/N/E/F/G/Z · Input shaft HS/U/T×V · Output shaft LS/S/W×Y · Weight (kg) · Oil (L)

Size Ratio Max Input (kW) Max Output Torque Weight (kg) Oil (L)
WPKA Series · Integral cast iron (P-type) · Foot mounted · 20CrMnTi Worm · ZCuSn10Pb1 Bronze Wheel · Input: 1,500 r/min
40 1/5–1/60 0.48

26 N·m

 4 0.13
50 1/5–1/60 0.80

43 N·m

 7 0.17
60 1/5–1/60 1.25

70 N·m

 10 0.22
70 1/10–1/60 1.60

113 N·m

 15 0.60
80 1/10–1/60 2.20

163 N·m

 21 0.85
100 1/10–1/60 3.60

291 N·m

 35 1.50
120 1/10–1/60 5.20

413 N·m

 60 3.20
135 1/10–1/60 9.75

707 N·m

 80 3.60
147 1/20–1/60 8.50

848 N·m

 98 3.70
155 1/20–1/60 12.80

848 N·m

 115 3.80
175 1/20–1/60 17.30

1,221 N·m

 150 4.60
200 1/20–1/60 22.60

1,782 N·m

 215 6.50
250 1/20–1/60 27.40

2,745 N·m

 360 9.00

* Peak output torque at the highest-torque ratio per size · Full ratio-by-ratio data available — request the complete data sheet

05
Material and Construction
Engineering Specifications — WPKA Series

Worm Shaft
Primary drive element
Alloy grade20CrMnTi
Surface hardnessHRC 58–62
Heat treatmentCase carburising + quenching
Surface finishGround, Ra ≤ 0.8 μm
Shaft core40Cr steel
Worm Wheel
Output driven element
Alloy gradeZCuSn10Pb1 tin-bronze
Tooth formZI involute profile
Bearing brandSKF / C&U / HRB
Shaft sealNAK / SKF lip seal
Leak test2.5 bar · 100% of units
Housing and Assembly
Structure and sealing
Housing gradeHT250 grey cast iron
Housing formIntegral cast iron (P-type)
LubricantISO VG220 gear oil
InputSolid shaft
OutputHollow bore shaft

06
Selection Correction Factors
Power Calculation and Correction Coefficient Tables
Apply correction factors a₁ and a₂ to the rated torque before selecting a gearbox size. Use Table 3 to verify motor input power.

Table 1
Ambient Temperature Correction Coefficient a₁
Ambient Temperature (°C) 10 – 25 26 – 30 31 – 40 41 – 50
a₁ 1.0 1.1 1.0 1.6

Table 2
Duty Condition Correction Coefficient a₂
Operating Condition Daily Running Hours (h)
≤ 2 h > 2 – 10 h > 10 – 24 h
Smooth running 0.8 1.0 1.2
Moderate shock load 1.0 1.2 1.4
Heavy shock load 1.25 1.5 1.75
ℹ If the gearbox starts, reverses, or changes direction 12 or more times per hour during operation, multiply the table value by an additional factor of 1.2.

Table 3
Input Shaft Power Calculation and Efficiency Coefficient u
Input Power Formula
P = T × n₂ ÷ (9550 × u)
P — Input shaft power (kW)
T — Corrected torque value (N·m)
n₂ — Output shaft speed (r/min)
u — Transmission efficiency (from table below)

Ratio 1:10 1:15 1:20 1:25 1:30 1:40 1:50 1:60
Efficiency u 0.76–0.90 0.75–0.86 0.74–0.84 0.72–0.82 0.68–0.70 0.65–0.75 0.62–0.72 0.60–0.70

07
Lubrication
Recommended Lubricants by Speed and Temperature
Select oil grade based on worm shaft speed and mounting orientation. Change after the first 100 operating hours, then every 2,500 hours.

Oil Grade Selection by Worm Shaft Speed and Operating Position
Worm Shaft Speed (r/min) Oil Type Upper Worm / Vertical Lower Output Shaft Vertical
Over Up to
1,000 3,000 Synthetic oils PG460 PG220
— 1,000 PG460
2,000 3,000 Mineral oils ISO VG460 ISO VG200
750 2,000 ISO VG320
250 750 ISO VG460
— 250 Mineral oils ISO VG660 ISO VG660

International Brand Equivalents by Ambient Temperature
Ambient Temp. Oil Type Esso Texaco Mobil Shell AGMA
15–60°C
−9 to −16°C		 Mineral oils Spartan EP220 Regal Oil R&D 320 DTE LIL BB Shell Omala Oil 220 5
Compounded oils Sparan EP320 631-Honor Cylinder Oil Mobil 600W Cylinder Oil Shell Omala Oil 320 7
Extreme pressure Spartan EP460 Meropa 460 Mobil Gears 634 Shell Omala Oil 460 7EP
50–125°C
10–52°C		 Mineral oils Spartan EP320 Regal Oil 320 DTE OIL AA Shell Omala Oil 320 6
Compounded oils Spartan EP460 642-650T Cylinder Oil Mobil 600W Super Cylinder Oil Shell Omala Oil 460 8
Extreme pressure Spartan EP680 Meropa 680 Mobil Gears 636 Shell Omala Oil 660 8EP
ℹ Drain and flush the unit after the first 100 operating hours. Thereafter, change oil every 2,500 hours or 12 months, whichever comes first. Use synthetic oil for continuous 24-hour duty.

08
Fault Diagnosis
Troubleshooting Guide — Common Faults and Remedies
Identify the fault symptom, locate the probable cause, and apply the recommended corrective action before returning the unit to service.

Fault Symptom Probable Cause Recommended Action
Overheating Motor, gearbox, or driven machine misaligned at coupling Re-align all three shafts to be co-axial. Check coupling and re-torque fasteners.
Overload running Reduce load to within rated torque. Apply correction factors a₁ and a₂.
Lip seal worn or excessively tight Apply grease at the seal lips; replace seal if worn.
Incorrect oil level or degraded lubricant Top up or drain and refill to the correct level. Use the grade specified in Table 4.
Vibration Motor, gearbox, or driven machine poorly fixed or misaligned Inspect and re-tighten all mounting fasteners. Re-align coupling.
Worm wheel tooth surface worn or damaged Replace the worm wheel assembly.
Bearing worn Replace bearing. Check shaft for scoring before refitting.
Abnormal Noise Bearing worn or clearance too large Replace bearing and adjust preload.
Poor worm wheel tooth mesh Check and adjust tooth contact; replace worm wheel pair if necessary.
Insufficient lubricant Top up oil to the correct level.
Foreign matter in housing Drain oil completely, flush housing, remove debris, refill with fresh oil.
Oil Leakage Lip seal damaged Replace lip seal.
Shaft journal surface worn at seal contact Replace input or output shaft. Fit new seal to match.
Oil overfilled Drain to the correct level per the oil gauge indicator.
Drain plug loose or oil gauge cracked Re-seal and tighten drain plug. Replace oil gauge if cracked.
Rapid Worm Wheel Wear Overload running Reduce load; check application duty factors against rated capacity.
Wrong lubricant grade Drain and refill with the correct grade from Table 4.
Insufficient lubricant Top up to the correct level at the oil gauge.
Oil change interval exceeded; lubricant degraded Drain, flush, and refill per the maintenance schedule.
Operating temperature too high Resolve overheating fault first (see above), then reduce ambient temperature or improve ventilation.

06
Applications
WPKA Series — Industry Use Cases

EVER-POWER worm gearbox manufacturing facility Hangzhou — CNC gear hobbing and precision assembly

EVER-POWER Manufacturing
CNC gear hobbing, heat treatment, and 100% pressure-testing in Hangzhou. Every WPKA unit is inspected and pre-filled before dispatch.
WPKA worm gear reducer installed in industrial drive application

WPKA Series in Service
The WPKA worm gear reducer serves conveyor, mixer, packaging, and agricultural drives across 40–250 mm centre distance.
🚧
Shaft-Mount Conveyor Drives

WPKA 60–250
Direct shaft mount

Belt conveyor head pulley shafts and screw conveyor shafts that slide directly into the WPKA hollow bore, eliminating the coupling and reducing drive train length by 80–150 mm.

🌾
Agricultural PTO and Shaft Drives

WPKA 40–135
Hollow bore PTO fit

Irrigation reel drives, auger shafts, and feed mixer shafts that mount directly in the hollow bore. The WPKA is particularly suited to field equipment where simple tool-free shaft installation and removal is important.

⚙
Agitator and Mixer Shaft Drives

WPKA 80–250
Direct agitator mounting

Agitator shafts in mixing vessels, reactors, and blenders that connect directly to the WPKA hollow bore without a stub shaft or coupling, reducing vessel cover penetration count.

🏭
Hoist and Winch Drum Drives

WPKA 100–250
Self-locking 1:30+

Drum shaft drive for hoists and winches. The hollow bore mounts directly on the drum shaft; the self-locking worm mesh holds the load on power-off at ratios of 1:30 and above.

07
Manufacturer
EVER-POWER PTE. LTD. — Factory Direct from Singapore
Singapore-registered. Hangzhou manufacturing. No intermediaries — factory pricing and ISO-certified quality on every order.

EVER-POWER worm gearbox factory Hangzhou — production floor

EVER-POWER Production Base · Hangzhou, China · 3 Plants · CNC Gear Hobbing · Heat Treatment · 100% Pressure-Test

EVER-POWER PTE. LTD.
Singapore Registered · Hangzhou Manufacturing · 20+ Years Experience

ISO 9001:2015
CE Certified
Triple ISO

🏭
3 Plants
Manufacturing Facilities
CNC gear hobbing, case-hardening, assembly, and 100% pressure-test in Hangzhou.
🔬
HRC 58–62
Worm Shaft Hardness
Case carburising and quenching on every shaft. Ra ≤ 0.8 μm ground finish. Hardness verified by Rockwell test.
📦
MOQ 10 pcs
OEM from Small Batches
Custom ratios, shaft sizes, keyways. Sample 15–25 days; production 30–45 days.
🌎
50+ Countries
Global Export
EU · US · UK · AU · NL · BR · CA · KR. DDP and DAP available.
📋
Triple ISO
Certified Quality
ISO 9001:2015 · ISO 14001 · ISO 45001. CE marking on request.
⚡
24 h
Quote Response
Send size, ratio, quantity, application. Full quote + drawing within 24 hours.

FAQ
Frequently Asked Questions — WPKA Series Worm Gearbox
What bore sizes are available for the WPKA?+
Standard bore sizes correspond to each centre distance and are listed in the dimensional drawing (Section 03). Non-standard bore diameters and keyway sizes are available as OEM options — specify when ordering.
Can the WPKA be used with a shrink disc instead of a key?+
Yes. A shrink disc clamping arrangement is available as an option, allowing tool-free shaft engagement and removal. Specify when ordering.
Does the WPKA self-lock?+
Yes, at ratios of 1:30 and above. Hollow bore output does not affect the self-locking characteristic.
What is the MOQ and lead time?+
MOQ 10 pcs, 30–45 days. Samples 15–25 days.
Are drawings available?+
2D DXF/PDF for all WPKA sizes within 24 hours at no charge.

Request a Quote — WPKA Series Worm Gearbox
Provide your required centre distance (40–250 mm), gear ratio (1:5 – 1:60), shaft direction, mounting type, and quantity. Full quotation with dimensional drawing returned within 24 hours.

MOQ 10 pcs

Sample 15–25 days

Quote in 24 hours

DDP / DAP available

Request a Quote →
Email Us Directly

📞 +65 8866 2737 · Singapore

Gear Reducers

World class gear manufacturing capabilities, quality material suppliers, and a state of the art quality process allows EPT to offer the highest level of precision, durability and endurance. The EPT Planetary Reducers are designed and built for advanced high speed low backlash applications. The EPT manufacturing processes allows us to offer exceptional shock load capacities and various mounting options.

Surface Treatment

Annealing, natural canonization, heat treatment, polishing, nickel plating, chrome plating, zinc plating,yellow passivization, gold passivization, satin, Black surface painted etc.

Processing Method

CNC machining, punch,turning, milling, drilling, grinding, broaching, welding and assembly

QC & Certificate

Technicians self-check in production,final-check before package by professional Quality inspector
ISO9001:2008 , ISO14001:2001,ISO/TS 16949:2009

Package & Lead Time

Size: Drawings
Wooden Case/Container and pallet, or as per customized specifications.
15-25days samples. 30-45days offcial order
Port: Shanghai/Ningbo port

FAQ

Q: Are you trading company or manufacturer ?
A: Our group consists in 3 factories and 2 abroad sales corporations.

Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.

Q: How long is your delivery time ? What is your terms of payment ?
A: Generally it is 40-45 days. The time may vary depending on the product and the level of customization. For standard products, the payment is: 30% T/T in advance ,balance before shipment.

Q: What is the exact MOQ or price for your product ?
A: As an OEM company, we can provide and adapt our products to a wide range of needs.Thus, MOQ and price may greatly vary with size, material and further specifications; For instance, costly products or standard products will usually have a lower MOQ. Please contact us with all relevant details to get the most accurate quotation.

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