Spur Gear Series – Up to 10,000 lb — Model M492 & M452B.
Up to 10,000 lb Capacity
When you need to lift, lower or position a heavy load, Thern’s spur gear hand winches are designed to deliver excellent performance and long life, no matter what your application.
Quick Facts
Series Models
| Series | Imperial | |||
| Load Rating | Brake | Drum Capacity | Low-Speed Force to Lift 1,000 lbs at Base Layer |
|
| M452 | 4,000 lbs | No | 300 ft | lO lbs |
| M452B | 4,000 lbs | Yes | 300 ft | lO lbs |
| M492 | 10,000 lbs | No | 540 ft | B ibs |
| M492B | 10,000 lbs | Yes | 540 ft | B ibs |
| Series | Imperial | |||
| Load Rating | Brake | Drum Capacity | Low-Speed Force to Lift 1,000 lbs at Base Layer |
|
| M452 | l,8l0 kg | No | 91 m | 5 kg |
| M452B | l,8l0 kg | Yes | 91 m | 5 kg |
| M492 | 4,535 kg | No | 164 m | 4 kg |
| M492B | 4,535 kg | Yes | 164 m | 4 kg |
Configurations and Performance Characteristics-Up to 10,000 lbs
| Model | Description | LOAD RATING | Wire Rope Dia.1 | DRUM CAPACITY 2 | Single Gear Ratio |
Double Gear Ratio |
Force3 to lift 1,000 lb |
Approx. Ship Weight |
|||||||||||||
| 1st Layer | Mid Drum | Full Drum | 1st Layer | Mid Drum | Full Drum | ||||||||||||||||
| (lb) | (kg) | (lb) | (kg) | (lb) | (kg) | (in) | (mm) | (ft) | (m) | (ft) | (m) | (ft) | (m) | (lb) | (kg) | (lb) | (kg) | ||||
| M452 | 4,000 lb-marine duty (for pulling only) | 4,000 | 1,814 | 3,300 | 1,496 | 2,500 | 1,133 | 1/4 | 6.4 | 23 | 7 | 130 | 39 | 300 | 91 | 4.42:1 | 19.54:1 | 10 | 4.5 | 83 | 38 |
| 5/16 | 7.9 | 18 | 5 | 89 | 27 | 200 | 60 | (dbl gear) | |||||||||||||
| 3/8 | 9.5 | 14 | 4 | 64 | 19 | 140 | 42 | ||||||||||||||
| M452B | 4,000 lb-marine duty with brake (for lifting) | 4,000 | 1,814 | 3,300 | 1,496 | 2,500 | 1,133 | 1/4 | 6.4 | 23 | 7 | 130 | 39 | 300 | 91 | 19.54:1 | 10 | 4.5 | 91 | 42 | |
| 5/16 | 7.9 | 18 | 5 | 89 | 27 | 200 | 60 | (dbl gear) | |||||||||||||
| 3/8 | 9.5 | 14 | 4 | 64 | 19 | 140 | 42 | ||||||||||||||
| M452B-A | 4,000 lb-marine duty with brake (for lifting) 4-inch drum width |
4,000 | 1,814 | 3,300 | 1,496 | 2,500 | 1,133 | 1/4 | 6.4 | 13 | 3 | 83 | 25 | 190 | 57 | 19.54:1 | 10 | 4.5 | 83 | 38 | |
| 5/16 | 7.9 | 9 | 2 | 56 | 17 | 120 | 36 | (dbl gear) | |||||||||||||
| 3/8 | 9.5 | 7 | 2 | 40 | 12 | 89 | 27 | ||||||||||||||
| M492 | 10,000 lb-marine duty (for pulling only) | 10,000 | 4,535 | 7,400 | 3,356 | 5,400 | 2,449 | 5/16 | 7.9 | 27 | 8 | 240 | 73 | 540 | 164 | 5.00:1 | 25.00:1 | 8 | 3.6 | 166 | 76 |
| 3/8 | 9.5 | 21 | 6 | 170 | 51 | 390 | 118 | (dbl gear) | |||||||||||||
| 1/2 | 12.7 | 15 | 4 | 100 | 30 | 230 | 70 | ||||||||||||||
| M492B | 10,000 lb-marine duty with brake (for lifting) | 10,000 | 4,535 | 7,400 | 3,356 | 5,400 | 2,449 | 5/16 | 7.9 | 27 | 8 | 240 | 73 | 540 | 164 | 25.00:1 | 8 | 3.6 | 173 | 79 | |
| 3/8 | 9.5 | 21 | 6 | 170 | 51 | 390 | 118 | (dbl gear) | |||||||||||||
| 1/2 | 12.7 | 15 | 4 | 100 | 30 | 230 | 70 | ||||||||||||||
| M492-12 | 10,000 lb-marine duty (for pulling only) 12-inch drum width |
10,000 | 4,535 | 7,400 | 3,356 | 5,400 | 2,449 | 5/16 | 7.9 | 46 | 14 | 380 | 115 | 850 | 259 | 5.00:1 | 25.00:1 | 8 | 3.6 | 175 | 80 |
| 3/8 | 9.5 | 37 | 11 | 270 | 82 | 610 | 185 | (dbl gear) | |||||||||||||
| 1/2 | 12.7 | 27 | 8 | 160 | 48 | 360 | 109 | ||||||||||||||
| M492B-12 | 10,000 lb-marine duty with brake (for lifting) 12-inch drum width |
10,000 | 4,535 | 7,400 | 3,356 | 5,400 | 2,449 | 5/16 | 7.9 | 46 | 14 | 380 | 115 | 850 | 259 | 25.00:1 | 8 | 3.6 | 190 | 87 | |
| 3/8 | 9.5 | 37 | 11 | 270 | 82 | 610 | 185 | (dbl gear) | |||||||||||||
| 1/2 | 12.7 | 27 | 8 | 160 | 48 | 360 | 109 | ||||||||||||||
| MB451 | Disc brake only for M452 (for lifting) | 13 | 6 | ||||||||||||||||||
| MB491 | Disc brake only for M492 and M492-l2 (for lifting) | 15 | 7 | ||||||||||||||||||
Please contact Thern or nearest Thern Distributor for f irm f ixed price and delivery.
1Actual drum capacities may be 25-30% less due to nonuniform winding. Wire rope tension will also affect drum capacity.
2Approximate handle force required to lift 1,000 lbs with an empty drum and maximum handle length.
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 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.
Spring Loaded Ratchets
For positive engagement with gear.
Steel Gear Covers
Protect gears and help prevent injuries.
Adjustable Handles
Handles adjust in length to change force required to move load.
Two-Year Warranty
Industry-leading two-year limited warranty on all our products.
WARNING: Prop 65: Products supplied by CERTEX USA may expose you to chemicals including Nickel, which is known to the State of California to cause cancer. For more information, visit to www.P65Warnings.ca.gov.
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