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Spur Gear

Thern Hand Winches

For up to 10,000 lbs

Spur Gear Hand Winches from Thern

  Models

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Model M401 Model M4022PB Model M4312PBSS Model M452 & M492
Model M401 Spur Gear Winches from Thern
For pulling up to 500 lbs
Model M4022PB Spur Gear Winches from Thern
For lifting or pulling up to 1000 lbs. Includes an automatic brake for positive load control
Model M4312PBSS Spur Gear Winches from Thern
Stainless steel for lifting or pulling up to 2000 lbs. and includes an automatic brake for positive load control
Model M452B Spur Gear Winches from Thern
For lifting or pulling up to 4,000 lbs. and includes automatic brake for positive load control

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Model Description Load Rating (lb) Wire Rope Diameter (in) Drum Capacity (ft) 2 Single Gear Ratio Double Gear Ratio Force3 to Lift 1,000 lb Approximate Ship Weight (lb)
1st Layer Mid Drum Full Drum 1st Later Mid Drum Full Drum
Single Reduction
M401 500 lb – marine duty 500 400 300 1/8 7 60 130 8
(for pulling only) 3/16 4 27 60
M4022 1000 lb – marine duty 1000 700 500 1/8 4 52 130 2.85:1 40 lb 12
(for pulling only) 3/16 3 26 57
M4022PB 1000 lb – marine duty 1000 700 500 1/8 4 52 130 2.85:1 41 lb 17
with brake (for lifting) 3/16 3 26 57
M4032 1000 lb – marine duty 1000 700 500 1/8 11 110 250 2.85:1 40 lb 14
(for pulling only) 3/16 7 51 110
M4032PB 1000 lb – marine duty 1000 700 500 1/8 11 110 250 2.85:1 41 lb 18
with brake (for lifting) 3/16 7 51 110
Double Reduction
M4312 2000 lb – marine duty 2000 1600 1200 3/16 8 48 110 3.83:1 14.7:1 20 lb 23
(for pulling only) 1/4 5 27 59 (double gear)
5/16 4 17 39
M4312PB 2000 lb – marine duty 2000 1600 1200 3/16 8 48 110 14.7:1 17 lb 28
with brake (for lifting) 1/4 5 27 59 (double gear)
5/16 4 17 39
M4412 2000 lb – marine duty 2000 1600 1200 3/16 18 97 210 3.83:1 14.7:1 20 lb 25
(for pulling only) 1/4 14 52 120 (double gear)
5/16 11 35 77
M4412PB 2000 lb – marine duty 2000 1600 1200 3/16 18 97 210 14.7:1 17 lb 30
with brake (for lifting) 1/4 14 52 120 (double gear)
5/16 11 35 77
Stainless Steel
M4042PBSS 1000 lb – stainless steel 1000 800 600 1/8 12 110 240 3.83:1 46 lb 24
with brake (for lifting) 3/16 8 48 110 (single gear)
1/4 5 27 59
M4312PBSS 2000 lb – stainless steel 2000 1600 1200 3/16 8 48 110 14.7:1 17 lb 28
with brake (for lifting) 1/4 5 27 59 (double gear)
5/16 4 17 39
Double Reduction - High Load
M452 4000 lb (for lifting) 4000 3300 2500 1/4 23 130 300 4:42:1 19:54:1 10 83
5/16 18 89 200
3/8 14 64 140
M452B 4000 lb (for lifting) 4000 3300 2500 1/4 23 130 300 19:54:1 10 91
5/16 18 89 200
3/8 14 64 140
M452B-A 4000 lb (for lifting) 4000 3300 2500 1/4 13 83 190 19:54:1 10 83
5/16 9 56 120
3/8 7 40 89
M492 10,000 lb (for lifting) 10,000 7400 5400 5/16 27 240 540 5.00:1 25.00:1 8 166
3/8 21 170 390
1/2 15 100 230
M492B 10,000 lb (for lifting) 10,000 7400 5400 5/16 46 380 850 25.00:1 8 173
3/8 21 170 390
1/2 15 100 230
M492-12 10,000 lb (for lifting) 10,000 7400 5400 5/16 46 380 850 5.00:1 25.00:1 8 175
3/8 37 270 610
1/2 27 160 360
M492B-12 10,000 lb (for lifting) 10,000 7400 5400 5/16 46 380 850 25.00:1 8 190
3/8 37 270 610
1/2 27 160 360
MB451 disc brake only for M452 (for lifting)   13
MB491 disc brake only for M492 and M492-12 (for lifting) 15
2 Actual drum capacities may be 25-30% less, due to nonuniform winding. Wire rope tension will also affect drum capacity.
3 Approximate handle force required to lift 1000 lb with an empty drum, and maximum handle length.

Read about Thern's 2-year Limited Warranty

  Features

Lift or pull up to 10,000 lbs. with a spur gear hand winch from Thern. Manufactured with machine-cut spur gears for accurate long-lasting service, spur gear hand winches are available in a variety of configurations to meet the performance requirements of your manual pulling, hoisting or lowering application.

Single Reduction Winches - Up to 2000 lb

  • Machine Cut Spur Gears for accurate and long lasting service.
  • Automatic Brake Models provide positive load control for lifting and lowering operations. Brake models have a PB or B suffix.
  • Corrosion Resistant trivalent zinc-plated finish protects against corrosion in harsh environments.
  • Quick Disconnect Anchor for quickly attaching or removing wire rope equipped with a swaged ball fitting.
  • Bronze and Radial Ball Bearings provide smooth and efficient operation.
  • Large Diameter Drums minimize wear to extend wire rope life.
  • Gear Covers protect gears and help prevent injuries.
  • Stainless Steel Models Available for harsh environments. See models with SS suffix. Stainless steel models are electro-polished for added corrosion resistance.
  • Two-year Limited Warranty

Double Reduction Winches - Up to 10000 lb

  • Machine Cut Spur Gears for accurate and long lasting service.
  • Automatic Brake Models provide positive load control for lifting and lowering operations. Brake models have B suffix.
  • Corrosion Resistant durable paint finish combined with trivalent zinc plating finish protects against corrosion.
  • Bronze and Radial Ball Bearings provide smooth and efficient operation.
  • Large Diameter Drums minimize wear to extend wire rope life.
  • Spring Loaded Ratchets for positive engagement with gear.
  • Steel Gear Covers protect gears and help prevent injuries.
  • Handles Adjust in length to change force required to move load.
  • Two-year Limited Warranty

  Dimensions

Model M401

Model M-401 Dimensions for Spur Gear Winches

Model M402PBSS

Model M4042pPBSS Dimensions for Spur Gear Winches

Model M4022 / M4032 / M4022PB

Model M402 Dimensions for Spur Gear Winches

Model M4042PBSS

Model M4042PBSS Dimensions for Spur Gear Winches

Model M4022PB

Model M4022PB Dimensions for Spur Gear Winches

Wire Rope Installations

Wire Rope Assemblies for Spur Gear Winches

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Dimension M401 M4022 M4022PB M4032 M4032PB M4042PBSS
Drum Diameter 1.50 1.50 1.50 1.50 1.50 2.50
Flange Diameter 4.06 4.56 4.56 4.56 4.56 5.50
Drum Width 2.75 2.00 2.00 4.00 4.00 3.00
A 6.56 7.27 7.27 7.27 7.27 8.21
B 10.56 9.00 12.12 11.00 14.12 13.77
C 4.56 6.12 6.12 6.12 6.12 6.90
D 2.50 3.31 3.31 3.31 3.31 3.75
E 2.50 2.00 2.00 2.00 2.00 2.25
F 5.81 5.25 8.12 7.25 10.12 9.76
G1 8.50 11.03 10.59 11.03 10.59 10.59
H1 11.28 13.56 13.12 13.56 13.12 13.50
J 2.19 1.84 1.84 3.00 3.00 1.44
K 4.38 3.68 3.68 5.68 5.68 5.26
L 2.50 2.82 2.82 2.00 2.00 5.00
M 3.50 5.00 5.00 5.00 5.00 6.00
S (Hole Diameter) 0.40 0.43 0.43 0.43 0.43 0.41
T 0.18 0.18 0.18 0.18 0.18 0.18
1 Models M401, M4022PB, M4032PB and M4042PBSS handles are adjustable, dimension shown is for maximum handle length.

Model M4312PB / M4412PBSS / M4312PBSS

Model M4312PB, M4412PBSS and M4312PBSS Dimensions for Spur Gear Winches

Model M4312 / M4312PB / M4312PBSS / M4412 / M4412PB

Model M412, M4312PB, M4312PBSS, M4412 and M4412PB Dimensions for Spur Gear Winches

Model M4312 / M4412

Model M4312, M4412 Dimensions for Spur Gear Winches

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Dimension M4312 M4312PB M4312PBSS M4412 M4412PB
Drum Diameter 2.50 2.50 2.50 2.50 2.50
Flange Diameter 5.50 5.50 5.50 5.50 5.50
Drum Width 3.00 3.00 3.00 6.00 6.00
A 10.00 10.00 10.00 10.00 10.00
B 12.70 14.50 14.50 15.70 17.50
C 7.15 7.15 7.15 7.15 7.15
D 4.00 4.00 4.00 4.00 4.00
E 4.00 4.00 4.00 4.00 4.00
F 8.00 10.78 10.78 11.00 13.78
G1 8.75 10.59 10.59 8.75 10.59
H1 13.35 15.19 15.19 13.35 15.19
J 3.34 3.34 3.34 6.34 6.34
K 5.31 5.31 5.31 8.31 8.31
L 5.00 5.00 5.00 5.00 5.00
M 6.00 6.00 6.00 6.00 6.00
S (Hole Diameter) 0.40 0.40 0.41 0.40 0.40
T 0.18 0.18 0.18 0.18 0.18
1 Models M4312PB, M4312PBSS and M4412PB handles are adjustable, dimension shown is for maximum handle length.

Disc Brake Dimensions

Diagram showing the dimensions of a disc brake for Thern spur gear hand winches.

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Model N P Q2 R U V
in mm in mm in mm in mm in mm in mm
MB451 4.97 126.2 10.44 265.1 21.25 539.7 4.87 123.6 2.44 61.9 8.62 218.9
MB491 5.15 130.8 10.62 269.7 21.38 543.0 4.87 123.6 2.44 61.9 10.56 268.2

2 Handles are adjustable. Dimension shown is for maximum handle length.


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