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Model 4WS

Thern Power Winches

4WS Series Power Winches from Thern

  Models

Portable Models - Up to 6,000 lb Capacity

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Model
Number
Model Number Extensions Motor Load Rating Wire
Rope
Dia.
Line Speed Drum Capacity1 Approx.
Ship
Weight2
Load
Rating
Line
Speed
Motor
Codes
Clutch
Opt
1st
Layer
Mid
Drum
Full
Drum
1st
Layer
Full
Drum
1st
Layer
Mid
Drum
Full
Drum
lb kg fpm mpm     hp lb kg lb kg lb kg in mm fpm mpm fpm mpm ft m ft m ft m lb kg
4WS1M6 800 362 15 4 A, B, D,
E, F
C .5 800 362 550 249 420 190 3/16 4.8 17 5 33 10 21 6 110 33 260 79 155 71
4WS1M6 800 362 30 9 A, B, D,
E, F
C .75 800 362 550 249 420 190 3/16 4.8 29 8 55 16 21 6 110 33 260 79 165 75
4WS1M6 800 362 40 12 A, B, D,
E, F
C 1 800 362 550 249 420 190 3/16 4.8 43 13 82 24 21 6 110 33 260 79 175 80
4WS1M6 1100 498 20 6 A, B, D,
E, F
C .75 1100 498 800 362 600 272 1/4 6.4 18 5 32 9 16 4 62 18 140 42 165 75
4WS1M6 1100 498 30 9 A, B, D,
E, F
C 1 1100 498 800 362 600 272 1/4 6.4 30 9 54 16 16 4 62 18 140 42 175 80
4WS1M6 1100 498 40 12 D, E, F C 1.5 1100 498 800 362 600 272 1/4 6.4 44 13 81 24 16 4 62 18 140 42 170 77
4WS1M6 1500 680 20 6 A, B, D,
E, F
C 1 1500 680 1000 453 800 362 1/4 6.4 18 5 32 9 16 4 62 18 140 42 175 80
4WS1M6 1500 680 30 9 D, E, F C 1.5 1500 680 1100 498 800 362 1/4 6.4 30 9 54 16 16 4 62 18 140 42 170 77
4WS1M6 1500 680 40 12 B, D,
E, F
C 2 1500 680 1100 498 800 362 1/4 6.4 44 13 81 24 16 4 62 18 140 42 180 82
Clutch Option for 4WS1M6 (for horizontal pulling only) add: 5 3
4WS3M10 2000 907 15 4 A, B, D,
E, F
C 1 2000 907 1300 589 1000 453 5/16 7.9 14 4 29 8 34 10 220 67 500 152 310 141
4WS3M10 2000 907 20 6 D, E, F C 1.5 2200 997 1400 635 1000 453 5/16 7.9 18 5 39 11 34 10 220 67 500 152 305 139
4WS3M10 2500 1133 20 6 B, D,
E, F
C 2 2500 1133 1600 725 1200 544 3/8 9.5 22 6 46 14 27 8 160 48 360 109 320 146
4WS3M10 3000 1360 15 4 D, E, F C 1.5 3000 1360 2000 907 1500 680 3/8 9.5 14 4 29 8 27 8 160 48 360 109 305 139
4WS3M10 3000 1360 20 6 B, D,
E, F
C 2 3000 1360 2000 907 1500 680 3/8 9.5 19 5 39 11 27 8 160 48 360 109 320 146
4WS3M10 3500 1587 7 2 A, B, D,
E, F
C 1 3500 1587 2300 1043 1700 771 7/16 11.1 8 2 15 4 23 7 120 36 270 82 330 150
4WS3M10 3500 1587 15 4 B, D,
E, F
C 2 3700 1678 2500 1133 1800 816 7/16 11.1 14 4 29 8 23 7 120 36 270 82 320 146
4WS3M10 3500 1587 20 6 D, E, F C 3 3700 1678 2500 1133 1800 816 7/16 11.1 23 7 46 14 23 7 120 36 270 82 330 150
Clutch Option for 4WS3M10 (for horizontal pulling only) add: 8 4
4WS6M12 3000 1360 10 3 D, E, F C 1.5 3400 1542 2200 997 1600 725 3/8 9.5 12 3 25 7 40 12 300 91 660 201 515 234
4WS6M12 3000 1360 20 6 B, D,
E, F
C 2 3100 1406 2000 907 1500 680 3/8 9.5 20 6 42 12 40 12 300 91 660 201 530 241
4WS6M12 4000 1814 10 3 B, D,
E, F
C 2 4500 2041 2900 1315 2100 952 7/16 11.1 12 3 25 7 34 10 220 67 500 152 530 241
4WS6M12 4000 1814 20 6 D, E, F C 3 4000 1814 2500 1133 1900 861 7/16 11.1 24 7 40 12 34 10 220 67 500 152 540 245
4WS6M12 6000 2721 4 1 A, B, D,
E, F
C 1 6200 2812 4000 1814 3000 1360 1/2 12.7 4 1 8 2 30 9 170 51 390 118 535 243
4WS6M12 6000 2721 10 3 D, E, F C 3 6400 2902 4200 1905 3100 1406 9/16 14.2 12 3 25 7 26 7 140 42 310 94 540 245
4WS6M12 6000 2721 20 6 D, E, F C 5 6400 2902 4200 1905 3100 1406 9/16 14.2 24 7 50 15 26 7 140 42 310 94 585 266
Clutch Option for 4WS6M12 (for horizontal pulling only) add: 12 6

Non-Portable Models - Up to 26,000 lb Capacity

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Model Model No. Extension Motor HP Load Running Line Speed
Load Rating (lb) Line Speed (fpm) Motor Codes1 1st Layer Mid Drum Full Drum 1st Layer Full Drum
(lb) (kg) (lb) (kg) (lb) (kg) (fpm) (mpm) (fpm) (mpm)
4WS9M18 7000 20 D,E,F 5 7,300 3,312 5,000 2,268 3,800 1,724 21 6.4 41 12.5
4WS9M18 7000 30 D,E,F 7.5 7,500 3,402 5,200 2,359 4,000 1,815 32 9.8 61 18.6
4WS9M18 10000 10 D,E,F 5 10,000 4,536 6,900 3,130 5,300 2,405 13 4.0 24 7.3
4WS9M18 10000 20 D,E,F 7.5 10,000 4,536 6,900 3,130 5,300 2,405 21 6.4 41 12.5
4WS9M18 10000 30 D,E,F 10 10,000 4,536 6,900 3,130 5,200 2,359 32 9.8 61 18.6
4WS16M20 13000 15 D,E,F 7.5 13,000 5,897 8,800 3,992 6,700 3,040 14 4.3 26 7.9
4WS16M20 13000 20 D,E,F 10 13,300 6,033 9,100 4,128 6,900 3,130 18 5.5 35 10.7
4WS16M20 13000 35 D,E,F 15 13,000 5,897 8,900 4,038 6,700 3,040 35 10.7 68 20.7
4WS16M20 16000 15 D,E,F 7.5 16,000 7,258 11,100 5,035 8,500 3,856 12 3.7 24 7.3
4WS16M20 16000 20 D,E,F 10 16,000 7,258 11,100 5,035 8,500 3,856 16 4.9 31 9.4
4WS26M26 22000 20 D,E,F 15 22,800 10,343 16,700 7,576 13,200 5,988 18 5.5 31 9.4
4WS26M26 22000 25 D,E,F 20 22,600 10,252 16,500 7,485 13,100 5,943 25 7.6 43 13.1
4WS26M26 22000 35 D,E,F 25 22,200 10,070 16,300 7,394 12,900 5,852 36 11.0 63 19.2
4WS26M26 26000 10 D,E,F 10 26,200 11,885 19,400 8,800 15,400 6,986 10 3.0 17 5.2
4WS26M26 26000 15 D,E,F 15 26,000 11,794 20,200 9,163 16,500 7,485 16 4.9 27 8.2

Motor Codes

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Motor Codes
A 115 Volt / 1 Phase
B 230 Volt / 1 Phase
D 230 Volt / 3 Phase
E 460 Volt / 3 Phase
F Ask your mdi sales representative about other voltages

Read about Thern's 2-year Limited Warranty

Drum Capacities

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Wire Rope
Dia.
Breaking
Strength
Drum
Capacity
4WS9M18 4WS16M20 4WS26M26
(in) (mm) (lb) (kg)   (ft) (m) (ft) (m) (ft) (m)
7/16 11.2 20,400 9,254 1st 87 26.5
Mid 670 204.2
Full 1500 457.2
1/2 12.7 26,600 12,066 1st 76 23.2
Mid 520 158.5
Full 1170 356.6
9/16 14.2 33,600 15,240 1st 67 20.4 89 27.1
Mid 420 128.0 690 210.3
Full 930 283.5 1,530 466.3
5/8 16.0 41,200 18,688 1st 59 18 78 23.8
Mid 340 103.6 560 170.7
Full 760 231.6 1250 381
3/4 19.1 58,800 26,671 1st 48 14.6 65 19.8 110 33.5
Mid 240 73.2 400 121.9 670 204.2
Full 540 164.6 880 268.2 1480 451.1
7/8 22.4 79,600 36,106 1st 54 16.5 94 28.7
Mid 290 88.4 480 146.3
Full 640 195.1 1070 326.1
1 25.4 103,400 46,902 1st 47 14.3 82 25.0
Mid 220 67.1 370 112.8
Full 490 149.4 830 253.0
1-1/8 28.7 130,000 58,968 1st 71 21.6
Mid 300 91.4
Full 660 201.2
1-1/4 31.8 159,800 72,485 1st 63 19.2
Mid 240 73.2
Full 530 161.5
1-3/8 34.9 192,000 87,090 1st 56 17.1
Mid 200 61.0
Full 440 134.1

Values based on 6x37 IWRC EIPS wire rope.
Actual drum capacities 25-30% less, due to nonuniform winding. Wire rope tension will also affect drum capacity.
Wire rope should be selected based on the breaking strength to load rating ratio and application parameters. Industry standards suggest a 5:1 breaking strength to load rating ratio for lifting and a 3:1 ratio for pulling.


  Features

Thern 4WS series power winches feature dual stage gear reduction for economical handling of large loads. The combination of helical/worm and spur gearing make these winches ideal for applications requiring secure load control and accurate positioning. Our modular design also means we can quickly customize these winches to meet your specific requirements.

  • FLANGE MOUNTED MOTOR is a 230/460 volt 3 phase motor, 60 cycle, IP 541, TEFC severe duty, reversible, class B or F insulated, continuous duty brakemotor. Standard motors comply with relevant standards including NEMA, MG1, ANSI, CSA, IEC1 and ABS.
  • LOAD HOLDING MOTOR DISC BRAKE is spring set, electrically released for positive load control.
  • DUAL STAGE GEARING, comprised of a worm or helical/worm and spur gears, make winches well suited for applications requiring secure load control and accurate positioning.
    The heat treated worm or helical/ worm gear set provides improved durability and operates in an oil bath, enclosed in a high strength cast iron gearcase, SAE class 30. Double-lip oil seals keep oil in and contaminants out. Large capacity bearings ensure long life. Speed reducers meet AGMA standards.
    Guarded, heat treated spur gearing provides secondary reduction. Grease zerks allow for easy lubrication.
  • FLANGE STYLE ROLLER BEARINGS are self-aligning bearings with cast housing to maintain smooth drum rotation.
  • EXTENDED STEEL DRUM SHAFT with both ends captured in fabricated steel frame for optimal strength and security.
  • WELDED STEEL DRUM with outside fl ange anchors allow for uniform winding and help extend life of wire rope. Anchors allow cable to be over wound or under wound from either side of the drum.
  • ANSI B30.7 COMPLIANCE is available. Please contact your mdi Rep.

Power Winches 4WS Options

Power Winches 4WS Options

Power Winches 4WS Options

Power Winches 4WS Options
  • Options

  • DRUM MODIFICATIONS (A) include grooved drums, multiple compartment drums and modifi ed drum widths and diameters.
  • WINCH MOUNTING OPTIONS include base, wall or under hung installation.
  • CABLE PRESSURE BARS (B) help maintain uniform winding of wire rope.
  • LIMIT SWITCHES (A) provide secondary shut-off for load travel in one or two directions.
  • MOTOR OPTIONS include air or hydraulic, voltage or phase changes, IP 55 or 65, class F or H insulated and multi-speed operation.
  • DUTY RATINGS include IEEE 45 marine duty, tropical duty, severe duty and explosion proof ratings.
  • BRAKE OPTIONS include over-speed, caliper style, band, and more.
  • CONTROLS (C) are available in a wide range of standard and custom confi gurations for single or variable speed.
  • CORROSION RESISTANT FINISHES (D) for harsh or hazardous environments.
  • MANUAL OVERRIDES for winch operation in power loss situations.
  • WIRE ROPE ASSEMBLIES sold separately.


Electric Motor Codes

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Model Description Approx. Ship Wt.
lb kg
10S3D4 electric motor controls 230/3/60 to 3 hp 25 12
10S7D4 electric motor controls 230/3/60 to 7.5 hp 25 12
10S10D4 electric motor controls 230/3/60 to 10 hp 28 13
10S20D4 electric motor controls 230/3/60 to 20 hp 28 13
10S30D4 electric motor controls 230/3/60 to 30 hp 60 28
10S7E4 electric motor controls 460/3/60 to 7.5 hp 25 12
10S15E4 electric motor controls 460/3/60 to 15 hp 25 12
10S20E4 electric motor controls 460/3/60 to 20 hp 28 13
10S40E4 electric motor controls 460/3/60 to 40 hp 60 28

  Dimensions

4WS - Portable

Dimensions for 4WS Model Portable Power Winch from Thern, side view

Side View


Dimensions for 4WS Model Portable Power Winch from Thern, front view

Front View


Dimensions for 4WS Model Portable Power Winch from Thern, top view

Top View


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Model Dimensions (in)
A* B* C D E H J K M N P R S
(hole dia.)
4WS1M6-800-15 21 21.62 3 6.75 2.25 11.75 1.75 6 9.75 1.25 8.5 11 .44
4WS1M6-800-30 21 22.38 3 6.75 2.25 11.75 1.75 6 9.75 1.25 8.5 11 .44
4WS1M6-800-40 21.75 23.38 3 6.75 2.25 11.75 1.75 6 9.75 1.25 8.5 11 .44
4WS1M6-1100-20 21 22.38 3 6.75 2.25 11.75 1.75 6 9.75 1.25 8.5 11 .44
4WS1M6-1100-30 21.75 23.38 3 6.75 2.25 11.75 1.75 6 9.75 1.25 8.5 11 .44
4WS1M6-1100-40 21.75 22.38 3 6.75 2.25 11.75 1.75 6 9.75 1.25 8.5 11 .44
4WS1M6-1500-20 21.75 23.38 3 6.75 2.25 11.75 1.75 6 9.75 1.25 8.5 11 .44
4WS1M6-1500-30 21.75 22.38 3 6.75 2.25 11.75 1.75 6 9.75 1.25 8.5 11 .44
4WS1M6-1500-40 21.75 25 3 6.75 2.25 11.75 1.75 6 9.75 1.25 8.5 11 .44
4WS3M10-2000-15 27.75 26.75 5 10.12 2.38 17.5 2.38 10 15 1.88 12.75 16.5 .59
4WS3M10-2000-20 27.75 25.75 5 10.12 2.38 17.5 2.38 10 15 1.88 12.75 16.5 .59
4WS3M10-2500-20 27.75 28.25 5 10.12 2.38 17.5 2.38 10 15 1.88 12.75 16.5 .59
4WS3M10-3000-15 27.75 25.75 5 10.12 2.38 17.5 2.38 10 15 1.88 12.75 16.5 .59
4WS3M10-3000-20 27.75 28.25 5 10.12 2.38 17.5 2.38 10 15 1.88 12.75 16.5 .59
4WS3M10-3500-7 27.75 32 5 10.12 2.38 17.5 2.38 10 15 1.88 12.75 16.5 .59
4WS3M10-3500-15 27.75 28.25 5 10.12 2.38 17.5 2.38 10 15 1.88 12.75 16.5 .59
4WS3M10-3500-20 28.81 33 5 10.12 2.38 17.5 2.38 10 15 1.88 12.75 16.5 .59
4WS6M12-3000-10 33 26.75 5.62 12.88 2.5 22.5 3.25 12 19 1.88 18.25 22 .88
4WS6M12-3000-20 33 29.5 5.62 12.88 2.5 22.5 3.25 12 19 1.88 18.25 22 .88
4WS6M12-4000-10 33 29.5 5.62 12.88 2.5 22.5 3.25 12 19 1.88 18.25 22 .88
4WS6M12-4000-20 34 29.25 5.62 12.88 2.5 22.5 3.25 12 19 1.88 18.25 22 .88
4WS6M12-6000-4 33 27.75 5.62 12.88 2.5 22.5 3.25 12 19 1.88 18.25 22 .88
4WS6M12-6000-10 34 29.25 5.62 12.88 2.5 22.5 3.25 12 19 1.88 18.25 22 .88
4WS6M12-6000-20 34 31 5.62 12.88 2.5 22.5 3.25 12 19 1.88 18.25 22

* Dimensions A and B may vary with motor selection.


Drum Dimensions

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Model Drum
Diameter
Flange
Diameter
Drum
Width
Fleet Angle
Distance1
in mm in mm in mm ft m
4WS1M6 2.88 73.16 7.0 177.8 6.0 152.4 10.0 3.05
4WS3M10 4.50 114.3 11.50 292.1 10.0 254 16.0 4.88
4WS6M12 5.50 139.7 14.0 355.6 12.0 304.8 20.0 6.10

1 Recommended minimum distance between drum and lead sheave for smooth drum.


4WS - Non-portable

Dimensions for 4WS Model Power Winches from Thern

Dimensions for 4WS Model Power Winches from Thern

Dimensions for 4WS Model Power Winches from Thern

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Model A B C D E H J K L M N P R S (Hole Diameter) Ship Weight
(in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (lb) (kg)
4WS9M18-7000-20 44.00 1,118 33.75 857 8.50 216 17.75 451 5.13 130 31.00 787 4.00 102 18.00 457 12.50 318 2.75 70 22.00 559 12.50 318 1-3⁄16 30 1,100 499
4WS9M18-7000-30 45.50 1,156 38.50 978 8.50 216 17.75 451 5.13 130 31.00 787 4.00 102 18.00 457 12.50 318 2.75 70 22.00 559 12.50 318 1-3⁄16 30 1,100 499
4WS9M18-10000-10 44.00 1,118 33.75 857 8.50 216 17.75 451 5.13 130 31.00 787 4.00 102 18.00 457 12.50 318 2.75 70 22.00 559 12.50 318 1-3⁄16 30 1,100 499
4WS9M18-10000-20 45.50 1,156 38.50 978 8.50 216 17.75 451 5.13 130 31.00 787 4.00 102 18.00 457 12.50 318 2.75 70 22.00 559 12.50 318 1-3⁄16 30 1,100 499
4WS9M18-10000-30 45.50 1,156 40.00 1,016 8.50 216 17.75 451 5.13 130 31.00 787 4.00 102 18.00 457 12.50 318 2.75 70 22.00 559 12.50 318 1-3⁄16 30 1,160 527
4WS16M20-13000-15 48.00 1,219 34.75 883 9.50 241 20.00 508 6.25 159 34.00 864 4.00 102 20.00 508 10.00 254 13.50 343 2.75 70 27.50 699 16.25 413 1-3⁄16 30 1,550 704
4WS16M20-13000-20 48.00 1,219 37.00 940 9.50 241 20.00 508 6.25 159 34.00 864 4.00 102 20.00 508 10.00 254 13.50 343 2.75 70 27.50 699 16.25 413 1-3⁄16 30 1,610 731
4WS16M20-13000-35 48.00 1,219 39.50 1,003 9.50 241 20.00 508 6.25 159 34.00 864 4.00 102 20.00 508 10.00 254 13.50 343 2.75 70 27.50 699 16.25 413 1-3⁄16 30 1,650 749
4WS16M20-16000-15 48.00 1,219 34.75 883 9.50 241 20.00 508 6.25 159 34.00 864 4.00 102 20.00 508 10.00 254 13.50 343 2.75 70 27.50 699 16.25 413 1-3⁄16 30 1,550 704
4WS16M20-16000-20 48.00 1,219 37.00 940 9.50 241 20.00 508 6.25 159 34.00 864 4.00 102 20.00 508 10.00 254 13.50 343 2.75 70 27.50 699 16.25 413 1-3⁄16 30 1,610 731
4WS26M26-22000-20 60.50 1,537 43.50 1,105 12.38 314 25.38 645 8.06 205 44.50 1,130 5.88 149 26.00 660 13.00 330 18.25 464 3.00 76 36.00 914 21.75 552 1-3⁄8 35 3,110 1,411
4WS26M26-22000-25 60.50 1,537 47.00 1,194 12.38 314 25.38 645 8.06 205 44.50 1,130 5.88 149 26.00 660 13.00 330 18.25 464 3.00 76 36.00 914 21.75 552 1-3⁄8 35 3,290 1,493
4WS26M26-22000-35 60.50 1,537 50.00 1,270 12.38 314 25.38 645 8.06 205 44.50 1,130 5.88 149 26.00 660 13.00 330 18.25 464 3.00 76 36.00 914 21.75 552 1-3⁄8 35 3,350 1,520
4WS26M26-26000-10 60.50 1,537 42.00 1,067 12.38 314 25.38 645 8.06 205 44.50 1,130 5.88 149 26.00 660 13.00 330 18.25 464 3.00 76 36.00 914 21.75 552 1-3⁄8 35 3,070 1,393
4WS26M26-26000-15 60.50 1,537 43.50 1,105 12.38 314 25.38 645 8.06 205 44.50 1,130 5.88 149 26.00 660 13.00 330 18.25 464 3.00 76 36.00 914 21.75 552 1-3⁄8 35 3,110 1,411

Drum Dimensions

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Model Drum
Diameter
Flange
Diameter
Drum
Width
Fleet Angle
Distance1
in mm in mm in mm ft m
4WS9M18 9 229 20 508 18 457 29 8.8
4WS16M20 10.75 273 24 610 20 508 32 9.8
4WS26M26 14 356 28 711 26 660 42 12.8

1 Recommended minimum distance between drum and lead sheave for smooth drum.


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