Torque Limiters
PT Tech’s continuously engaged friction torque limiters require no resetting. Color coded spring cups provide visual identification of the torque setting and are torque tamperproof. Our torque limiters offer high torque accuracy for the lifetime of the clutch, providing high levels of uptime and safety for your equipment.
FMD Series
PT Tech’s FMD series is a friction-type multiple disc torque limiter for high horsepower, high energy and/or limited space applications. They are designed to operate on the high speed side of a drive system.
Torque Limiter FMD28
Technical Specs
| Max Torque | 7,640 lb-ft | 10,352 Nm |
| Max Speed | 3,450 rpm | |
| Outside Diameter | 16.50 in | 419.1 mm |
| Torque Limiter Length | 6.67 in | 169.4 mm |
| Outside Hub Length | 5.65 in | 143.5 mm |
| Max Bore | 4.29 in | 109.0 mm |
Torque Limiter FMD36
Technical Specs
| Max Torque | 15,168 lb-ft | 20,544 Nm |
| Max Speed | 2,500 rpm | |
| Outside Diameter | 20.13 in | 511.3 mm |
| Torque Limiter Length | 7.16 in | 181.9 mm |
| Outside Hub Length | 6.00 in | 152.4 mm |
| Max Bore | 5.375 in | 136.5 mm |
Torque Limiter FMD44
Technical Specs
| Max Torque | 25,552 lb-ft | 34,752 Nm |
| Max Speed | 2,050 rpm | |
| Outside Diameter | 23.75 in | 603.3 mm |
| Torque Limiter Length | 7.16 in | 181.9 mm |
| Outside Hub Length | 6.00 in | 152.4 mm |
| Max Bore | 7.375 in | 200 mm |
UJT Series
PT Tech’s UJT-500 Series is a maintenance-free continuously engaged friction type torque limiter.
The torque setting is pre-set at the factory. The tamper resistant torque setting can only be changed by installing a different complement of spring cup bolts thus preventing equipment damage dueto unauthorized adjustment.
The spring cup bolts are pretested and pre-shimmed to maintain a consistent and predictable force on the friction material. They eliminate the need to adjust the torque limiter torque setting at installation and throughout its wearlife. The spring cup bolts are color-coded according to their strength. The torque is easy to verify by counting the quantity and colorof spring bolt assemblies.
The standard output is machinedto accept a Spicer industrial driveshaft. The UJT-500 Series is available with optional input and output configurations. The UJT-500 Series clutches are continuously engaged. They are not subject to nuisancetrip-outs like releasable torque limiters (shear pins, ball detent, pressurized slip devices, etc.). The UJT will act likea torsional shock absorber and does not limit drive engine performance because the torque setting is above the engine or electric motor’s peak torque.
Torque Limiter UJT28
Technical Specs
| Max Torque | 2,292 lb-ft |
| Max Speed | 3,000 rpm |
| Inertia – Complete Torque Limiter w/o Coupling | 17.4 lb-ft2 |
| Inertia – Torque Limiter Output only | 2.4 lb-ft2 |
| Weight | 102 lbs |
| Torque Limited | Double disc output |
Torque Limiter UJT228
Technical Specs
| Max Torque | 4,584 lb-ft |
| Max Speed | 2,100 rpm |
| Inertia – Complete Torque Limiter w/o Coupling | 19.4 lb-ft2 |
| Inertia – Torque Limiter Output only | 2.7 lb-ft2 |
| Weight | 115 lbs |
| Torque Limited | Double disc output |
Torque Limiter UJT328
Technical Specs
| Max Torque | 6,876 lb-ft |
| Max Speed | 2,100 rpm |
| Inertia – Complete Torque Limiter w/o Coupling | 21.5 lb-ft2 |
| Inertia – Torque Limiter Output only | 3.2 lb-ft2 |
| Weight | 130 lbs |
| Torque Limited | Triple disc output |
Torque Limiter UJT35
Technical Specs
| Max Torque | 3,024 lb-ft |
| Max Speed | 2,100 rpm |
| Inertia – Complete Torque Limiter w/o Coupling | 41.3 lb-ft2 |
| Inertia – Torque Limiter Output only | 6.0 lb-ft2 |
| Weight | 164 lbs |
| Torque Limited | 6.0 lb-ft2 |
Torque Limiter UJT235
Technical Specs
| Max Torque | 3,024 lb-ft |
| Max Speed | 2,100 rpm |
| Inertia – Complete Torque Limiter w/o Coupling | 41.3 lb-ft2 |
| Inertia – Torque Limiter Output only | 6.0 lb-ft2 |
| Weight | 164 lbs |
| Torque Limited | 6.0 lb-ft2 |
Torque Limiter UJT335
Technical Specs
| Max Torque | 9,072 lb-ft |
| Max Speed | 1,800 rpm |
| Inertia – Complete Torque Limiter w/o Coupling | 48 lb-ft2 |
| Inertia – Torque Limiter Output only | 7.7 lb-ft2 |
| Weight | 198 lbs |
| Torque Limited | Triple disc output |
SLQ Series
PT Tech’s SLQ series is a friction torque limiter designed for standard torque and energies.
This is an economical way to protect your expensive drive train from shockload damage, while allowing your equipment to continue to perform. No resetting is required after shockloads occur and torques are pre-set by your design staff.
Torque Limiter SLQ15
Technical Specs
| Max Torque | 438 lb-ft | 594 Nm |
| Max Speed | 3,600 rpm | |
| Inertia Total | 2.32 lb-ft2 | 0.0977 kg-m2 |
| Inertia Output | 0.16 lb-ft2 | 0.0067 kg-m2 |
| Weight | 27 lbs | 12.3 kg |
Torque Limiter SLQ19
Technical Specs
| Max Torque | 950 lb-ft | 1,288 Nm |
| Max Speed | 3,000 rpm | |
| Inertia Total | 5.1 lb-ft2 | 0.2147 kg-m2 |
| Inertia Output | 0.43 lb-ft2 | 0.0181 kg-m2 |
| Weight | 45 lbs | 20.5 kg |
Torque Limiter SLQ28
Technical Specs
| Max Torque | 2,096 lb-ft | 2,842 Nm |
| Max Speed | 2,500 rpm | |
| Inertia Total | 16.94 lb-ft2 | 0.7133 kg-m2 |
| Inertia Output | 1.75 lb-ft2 | 0.0737 kg-m2 |
| Weight | 84 lbs | 38.2 kg |
Torque Limiter SLQ35
Technical Specs
| Max Torque | 3,828 lb-ft | 5,192 Nm |
| Max Speed | 2,000 rpm | |
| Inertia Total | 40.32 lb-ft2 | 1.699 kg-m2 |
| Inertia Output | 6.81 lb-ft2 | 0.287 kg-m2 |
| Weight | 169 lbs | 376.85 kg |
SL Series
PT Tech’s SL series is a friction torque limiter designed for standard torque and energy requirements for mining applications.
This is an economical way to protect your expensive drive train from shockload damage, while allowing your equipment to continue to perform. No resetting is required after shockloads occur and torques are pre-set by your design staff. PT Tech has other model torque limiters for applications requiring greater torque capacity within the same diameter as the SL series.
Torque Limiter SL19
Technical Specs
| Max Torque | 3,312 lb-ft | 4,490 Nm |
| Max Speed | 2,000 rpm | |
| Inertia Total | 6.32 lb-ft2 | 0.266 kg-m2 |
| Inertia Output | 0.785 lb-ft2 | 0.033 kg-m2 |
| Weight | 74 lbs | 34 kg |
| Outside Diameter | 10 in | 254.0 mm |
Torque Limiter SL23
Technical Specs
| Max Torque | 5,724 lb-ft | 7,761 Nm |
| Max Speed | 2,000 rpm | |
| Inertia Total | 8.74 lb-ft2 | 0.368 kg-m2 |
| Inertia Output | 0.757 lb-ft2 | 0.032 kg-m2 |
| Weight | 80 lbs | 36 kg |
| Outside Diameter | 11.25 in | 285.8 mm |
Torque Limiter SL28
Technical Specs
| Max Torque | 4,584 lb-ft | 6,215 Nm |
| Max Speed | 2,000 rpm | |
| Inertia Total | 15.9 lb-ft2 | 0.670 kg-m2 |
| Inertia Output | 1.99 lb-ft2 | 0.084 kg-m2 |
| Weight | 105 lbs | 48 kg |
| Outside Diameter | 13.125 in | 333.4 mm |
CMD Series
PT Tech’s CMD series are friction-type compact multiple disc torque limiters for levelers and flatteners on steel processing lines and other high torque, limited radial space applications.
They perform best on the slow speed side of a gearbox. The torque setting is set at the factory and does not require adjusting throughout its wear life. Wear life indicators are available on most designs. CMD units protect drive components from damaging torque overloads. Also, when a significant tension differential exists between the entry and exit rolls, the CMD’s will slip just enough to evenly distribute the load.
Typically, CMD units are custom designed. There are two different design configurations, output shaft mounted and mid-spindle mounted. Examples of each configuration are shown. Maximum torque is affected by the available shaft engagement length (DIMENSION E), distance between centerlines of the output shafts, and the strength of available springs.
Torque Limiter CMD70
Technical Specs
| Max Torque | 490 lb·ft |
| Mounted Type | Mid Spindle |
| A1 – Housing Diameter | 2.75 in |
| A2 – Endplate Diameter | 2.5 in |
| B – Housing Length | 7.6 in |
| E – Shaft Engagement | 6.96 in |
Torque Limiter CMD83
Technical Specs
| Max Torque | 600 lb·ft |
| Mounted Type | Mid Spindle |
| A1 – Housing Diameter | 3.25 in |
| A2 – Endplate Diameter | 3.25 in |
| B – Housing Length | 3.25 in |
| E – Shaft Engagement | 3.25 in |
Torque Limiter CMD120
Technical Specs
| Max Torque | 550 lb·ft |
| Mounted Type | Shaft |
| A1 – Housing Diameter | 4.75 in |
| A2 – Endplate Diameter | As Required |
| B – Housing Length | 77.38 in |
| E – Shaft Engagement | 6.38 in |
Torque Limiter CMD180
Technical Specs
| Max Torque | 3,630 lb·ft |
| Mounted Type | Shaft |
| A1 – Housing Diameter | 7.12 in |
| A2 – Endplate Diameter | As Required |
| B – Housing Length | 9.72 in |
| E – Shaft Engagement | 8.66 in |