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Stainless Steel Screw Jacks

Stainless steel screw jacks offer superior corrosion resistance, making them ideal for use in harsh, wet, or corrosive environments. They are also known for their durability, long service life, and ability to handle heavy loads.

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Features and Benefits

  • Capacity
    From 2- to 100- tons.
  • Maximum Control
    Anti-backlash models available.
  • Corrosion Resistance
    Stainless steel screw jacks are highly resistant to oxidation and corrosion, making them suitable for use in harsh environments, including wet or corrosive conditions.
  • Clean Room Suitable
    Ideal for applications where hygiene and preventing contamination are critical.
  • Temperature Resistant 
    Stainless steel can withstand extreme temperatures, making it suitable for applications in high heat or cold.
  • Protected Gear Design
    Sealed gear cavity keeps water and other contaminants out.
  • Control Screw Rotation
    Available with keyed lifting screws for translating screw models.
  • Retrofit Applications
    They can be used to replace non-stainless steel actuators in existing systems.
  • Optional Special Features
    Closed heights, lifting screw ends, worm shaft extensions, lifting screw thread pitches, materials, stop nut, bellows boot.

Optional Features

  • Key Accessories Bellows Boot
    - Encoder
    - C-Face Adapter
    - Hand wheel
    - Rotary Counter
    - Limit Switch
    - Reducer

  • Screw End Options
    - Clevis End Screw
    - Double Clevis End
    - Top Plate Screw
    - Plain End Screw
    - Threaded End Screw

  • Base Model Configurations
    - Inverted Rotating
    - Upright Rotating
    - Keyed, Anti-rotation

Specifications

<p><strong>Performance Table Instructions</strong>&nbsp;<br />When reviewing and Duff-Norton Actuator Performance Specification Table, as part of the process of selecting the best-suited actuator for your application, there are several important worm-gear ratios to consider.<br /><strong>Standard Ratio</strong>&nbsp;- is frequently chosen when higher speeds and efficiency ratings are desired.<br /><strong>Optional Ratio</strong>&nbsp;- is frequently chosen when the application requires higher lifting capacities, lower speeds, or to ease the use of a handwheel.<br /><strong>Numeric Ratio</strong>&nbsp;- is frequently chosen for applications requiring fine adjustments, higher lifting capacities, lowerspeeds, the easy use of a handwheel, self locking applications, and also offers the benefit of an even number of worm input turns per inch of stroke.</p>
<table style="width: 100%;" border="0" width="100%" cellspacing="0" cellpadding="10">
<tbody>
<tr>
<th style="width: 112.695%;" colspan="12" scope="col">
<h3>Performance Specifications - Machine Screw Actuator Stainless Steel</h3>
</th>
</tr>
<tr>
<th style="width: 38%;" colspan="2" scope="col">
<p>Capacity (tons) - 17-4PH Worn</p>
</th>
<th style="width: 7.02905%;" scope="col">
<p>2</p>
</th>
<th style="width: 7.02905%;" scope="col">
<p>5</p>
</th>
<th style="width: 7.02905%;" scope="col">
<p>10</p>
</th>
<th style="width: 7.02905%;" scope="col">
<p>15</p>
</th>
<th style="width: 7.59138%;" scope="col">
<p>20</p>
</th>
<th style="width: 8.45345%;" scope="col">
<p>25</p>
</th>
<th style="width: 6.72931%;" scope="col">
<p>30</p>
</th>
<th style="width: 7.59138%;" scope="col">
<p>35</p>
</th>
<th style="width: 7.59138%;" scope="col">
<p>50</p>
</th>
<th style="width: 8.62231%;" scope="col">
<p>100</p>
</th>
</tr>
<tr>
<th style="width: 38%;" colspan="2" scope="col">
<p>Capacity (tons) - 316 SSWorn</p>
</th>
<th style="width: 7.02905%;" scope="col" width="7%">
<p>0.67</p>
</th>
<th style="width: 7.02905%;" scope="col" width="7%">
<p>1.66</p>
</th>
<th style="width: 7.02905%;" scope="col" width="7%">
<p>3.33</p>
</th>
<th style="width: 7.02905%;" scope="col" width="7%">
<p>5.00</p>
</th>
<th style="width: 7.59138%;" scope="col" width="7%">
<p>6.66</p>
</th>
<th style="width: 8.45345%;" scope="col" width="7%">
<p>8.33</p>
</th>
<th style="width: 6.72931%;" scope="col" width="7%">
<p>9.9</p>
</th>
<th style="width: 7.59138%;" scope="col" width="7%">
<p>11.66</p>
</th>
<th style="width: 7.59138%;" scope="col" width="7%">
<p>16.66</p>
</th>
<th style="width: 8.62231%;" scope="col" width="7%">
<p>33.33</p>
</th>
</tr>
<tr>
<td style="width: 20%;" rowspan="4" width="20%">
<p>Lifting Screw</p>
</td>
<td style="width: 18%;" width="18%">
<p>Diameter (in)</p>
</td>
<td style="width: 7.02905%;">
<p>1</p>
</td>
<td style="width: 7.02905%;">
<p>1-1/2</p>
</td>
<td style="width: 7.02905%;">
<p>2</p>
</td>
<td style="width: 7.02905%;">
<p>1-1/4</p>
</td>
<td style="width: 7.59138%;">
<p>2-1/2</p>
</td>
<td style="width: 8.45345%;">
<p>3</p>
</td>
<td style="width: 6.72931%;">
<p>3</p>
</td>
<td style="width: 7.59138%;">
<p>3-3/4</p>
</td>
<td style="width: 7.59138%;">
<p>4-1/2</p>
</td>
<td style="width: 8.62231%;">
<p>6</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Pitch (Std. &amp; Opt.)</p>
</td>
<td style="width: 7.02905%;">
<p>0.250</p>
</td>
<td style="width: 7.02905%;">
<p>0.375</p>
</td>
<td style="width: 7.02905%;">
<p>0.500</p>
</td>
<td style="width: 7.02905%;">
<p>0.500</p>
</td>
<td style="width: 7.59138%;">
<p>0.500</p>
</td>
<td style="width: 8.45345%;">
<p>0.666</p>
</td>
<td style="width: 6.72931%;">
<p>0.666</p>
</td>
<td style="width: 7.59138%;">
<p>0.666</p>
</td>
<td style="width: 7.59138%;">
<p>0.666</p>
</td>
<td style="width: 8.62231%;">
<p>0.750</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Pitch (Numerical)</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.02905%;">
<p>0.250</p>
</td>
<td style="width: 7.02905%;">
<p>0.250</p>
</td>
<td style="width: 7.02905%;">
<p>0.250</p>
</td>
<td style="width: 7.59138%;">
<p>0.250</p>
</td>
<td style="width: 8.45345%;">
<p>0.320</p>
</td>
<td style="width: 6.72931%;">
<p>0.320</p>
</td>
<td style="width: 7.59138%;">
<p>0.320</p>
</td>
<td style="width: 7.59138%;">
<p>0.320</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Type</p>
</td>
<td style="width: 7.02905%;">
<p>ACME</p>
</td>
<td style="width: 7.02905%;">
<p>ACME</p>
</td>
<td style="width: 7.02905%;">
<p>ACME</p>
</td>
<td style="width: 7.02905%;">
<p>ACME</p>
</td>
<td style="width: 7.59138%;">
<p>ACME</p>
</td>
<td style="width: 8.45345%;">
<p>ACME</p>
</td>
<td style="width: 6.72931%;">
<p>ACME</p>
</td>
<td style="width: 7.59138%;">
<p>ACME</p>
</td>
<td style="width: 7.59138%;">
<p>Mod. Sq.</p>
</td>
<td style="width: 8.62231%;">
<p>Mod. Sq.</p>
</td>
</tr>
<tr>
<td style="width: 20%;" rowspan="4">
<p>Worm Gear Ratios</p>
</td>
<td style="width: 18%;">
<p>Standard</p>
</td>
<td style="width: 7.02905%;">
<p>6:1</p>
</td>
<td style="width: 7.02905%;">
<p>6:1</p>
</td>
<td style="width: 7.02905%;">
<p>8:1</p>
</td>
<td style="width: 7.02905%;">
<p>8:1</p>
</td>
<td style="width: 7.59138%;">
<p>8:1</p>
</td>
<td style="width: 8.45345%;">
<p>10-2/3:1</p>
</td>
<td style="width: 6.72931%;">
<p>10-2/3:1</p>
</td>
<td style="width: 7.59138%;">
<p>10-2/3:1</p>
</td>
<td style="width: 7.59138%;">
<p>10-2/3:1</p>
</td>
<td style="width: 8.62231%;">
<p>12:1</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 1</p>
</td>
<td style="width: 7.02905%;">
<p>24:1</p>
</td>
<td style="width: 7.02905%;">
<p>24:1</p>
</td>
<td style="width: 7.02905%;">
<p>24:1</p>
</td>
<td style="width: 7.02905%;">
<p>24:1</p>
</td>
<td style="width: 7.59138%;">
<p>24:1</p>
</td>
<td style="width: 8.45345%;">
<p>32:1</p>
</td>
<td style="width: 6.72931%;">
<p>32:1</p>
</td>
<td style="width: 7.59138%;">
<p>32:1</p>
</td>
<td style="width: 7.59138%;">
<p>32:1</p>
</td>
<td style="width: 8.62231%;">
<p>36:1</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 2</p>
</td>
<td style="width: 7.02905%;">
<p>12:1</p>
</td>
<td style="width: 7.02905%;">
<p>12:1</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.45345%;">
<p>&mdash;</p>
</td>
<td style="width: 6.72931%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Numeric Ratio</p>
</td>
<td style="width: 7.02905%;">
<p>25:1</p>
</td>
<td style="width: 7.02905%;">
<p>25:1</p>
</td>
<td style="width: 7.02905%;">
<p>25:1</p>
</td>
<td style="width: 7.02905%;">
<p>25:1</p>
</td>
<td style="width: 7.59138%;">
<p>25:1</p>
</td>
<td style="width: 8.45345%;">
<p>32:1</p>
</td>
<td style="width: 6.72931%;">
<p>32:1</p>
</td>
<td style="width: 7.59138%;">
<p>32:1</p>
</td>
<td style="width: 7.59138%;">
<p>32:1</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 20%;" rowspan="4">
<p>Turns of Worm for</p>
<p>1 inch Stroke</p>
</td>
<td style="width: 18%;">
<p>Standard</p>
</td>
<td style="width: 7.02905%;">
<p>24</p>
</td>
<td style="width: 7.02905%;">
<p>16</p>
</td>
<td style="width: 7.02905%;">
<p>16</p>
</td>
<td style="width: 7.02905%;">
<p>16</p>
</td>
<td style="width: 7.59138%;">
<p>16</p>
</td>
<td style="width: 8.45345%;">
<p>16</p>
</td>
<td style="width: 6.72931%;">
<p>16</p>
</td>
<td style="width: 7.59138%;">
<p>16</p>
</td>
<td style="width: 7.59138%;">
<p>16</p>
</td>
<td style="width: 8.62231%;">
<p>16</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 1</p>
</td>
<td style="width: 7.02905%;">
<p>100</p>
</td>
<td style="width: 7.02905%;">
<p>67</p>
</td>
<td style="width: 7.02905%;">
<p>50</p>
</td>
<td style="width: 7.02905%;">
<p>50</p>
</td>
<td style="width: 7.59138%;">
<p>50</p>
</td>
<td style="width: 8.45345%;">
<p>48</p>
</td>
<td style="width: 6.72931%;">
<p>48</p>
</td>
<td style="width: 7.59138%;">
<p>48</p>
</td>
<td style="width: 7.59138%;">
<p>48</p>
</td>
<td style="width: 8.62231%;">
<p>48</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 2</p>
</td>
<td style="width: 7.02905%;">
<p>50</p>
</td>
<td style="width: 7.02905%;">
<p>33</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.45345%;">
<p>&mdash;</p>
</td>
<td style="width: 6.72931%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Numeric Ratio</p>
</td>
<td style="width: 7.02905%;">
<p>100</p>
</td>
<td style="width: 7.02905%;">
<p>100</p>
</td>
<td style="width: 7.02905%;">
<p>100</p>
</td>
<td style="width: 7.02905%;">
<p>100</p>
</td>
<td style="width: 7.59138%;">
<p>100</p>
</td>
<td style="width: 8.45345%;">
<p>100</p>
</td>
<td style="width: 6.72931%;">
<p>100</p>
</td>
<td style="width: 7.59138%;">
<p>100</p>
</td>
<td style="width: 7.59138%;">
<p>100</p>
</td>
<td style="width: 8.62231%;">
<p>100</p>
</td>
</tr>
<tr>
<td style="width: 20%;" rowspan="4">
<p>Worm Torque at No</p>
<p>Load (in-lb)</p>
</td>
<td style="width: 18%;">
<p>Standard</p>
</td>
<td style="width: 7.02905%;">
<p>5</p>
</td>
<td style="width: 7.02905%;">
<p>10</p>
</td>
<td style="width: 7.02905%;">
<p>20</p>
</td>
<td style="width: 7.02905%;">
<p>20</p>
</td>
<td style="width: 7.59138%;">
<p>30</p>
</td>
<td style="width: 8.45345%;">
<p>40</p>
</td>
<td style="width: 6.72931%;">
<p>40</p>
</td>
<td style="width: 7.59138%;">
<p>50</p>
</td>
<td style="width: 7.59138%;">
<p>100</p>
</td>
<td style="width: 8.62231%;">
<p>200</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 1</p>
</td>
<td style="width: 7.02905%;">
<p>5</p>
</td>
<td style="width: 7.02905%;">
<p>10</p>
</td>
<td style="width: 7.02905%;">
<p>20</p>
</td>
<td style="width: 7.02905%;">
<p>20</p>
</td>
<td style="width: 7.59138%;">
<p>30</p>
</td>
<td style="width: 8.45345%;">
<p>40</p>
</td>
<td style="width: 6.72931%;">
<p>40</p>
</td>
<td style="width: 7.59138%;">
<p>50</p>
</td>
<td style="width: 7.59138%;">
<p>100</p>
</td>
<td style="width: 8.62231%;">
<p>200</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 2</p>
</td>
<td style="width: 7.02905%;">
<p>5</p>
</td>
<td style="width: 7.02905%;">
<p>10</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.45345%;">
<p>&mdash;</p>
</td>
<td style="width: 6.72931%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Numeric Ratio</p>
</td>
<td style="width: 7.02905%;">
<p>5</p>
</td>
<td style="width: 7.02905%;">
<p>10</p>
</td>
<td style="width: 7.02905%;">
<p>20</p>
</td>
<td style="width: 7.02905%;">
<p>20</p>
</td>
<td style="width: 7.59138%;">
<p>30</p>
</td>
<td style="width: 8.45345%;">
<p>40</p>
</td>
<td style="width: 6.72931%;">
<p>40</p>
</td>
<td style="width: 7.59138%;">
<p>50</p>
</td>
<td style="width: 7.59138%;">
<p>100</p>
</td>
<td style="width: 8.62231%;">
<p>200</p>
</td>
</tr>
<tr>
<td style="width: 20%;" rowspan="4">
<p>Maximum Horsepower</p>
<p>per Actuator</p>
</td>
<td style="width: 18%;">
<p>Standard</p>
</td>
<td style="width: 7.02905%;">
<p>2</p>
</td>
<td style="width: 7.02905%;">
<p>4</p>
</td>
<td style="width: 7.02905%;">
<p>5</p>
</td>
<td style="width: 7.02905%;">
<p>5</p>
</td>
<td style="width: 7.59138%;">
<p>5</p>
</td>
<td style="width: 8.45345%;">
<p>8</p>
</td>
<td style="width: 6.72931%;">
<p>8</p>
</td>
<td style="width: 7.59138%;">
<p>8</p>
</td>
<td style="width: 7.59138%;">
<p>15</p>
</td>
<td style="width: 8.62231%;">
<p>25</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 1</p>
</td>
<td style="width: 7.02905%;">
<p>1/2</p>
</td>
<td style="width: 7.02905%;">
<p>3/4</p>
</td>
<td style="width: 7.02905%;">
<p>1-1/2</p>
</td>
<td style="width: 7.02905%;">
<p>1-1/2</p>
</td>
<td style="width: 7.59138%;">
<p>1-1/2</p>
</td>
<td style="width: 8.45345%;">
<p>1-1/2</p>
</td>
<td style="width: 6.72931%;">
<p>1-1/2</p>
</td>
<td style="width: 7.59138%;">
<p>1-1/2</p>
</td>
<td style="width: 7.59138%;">
<p>6</p>
</td>
<td style="width: 8.62231%;">
<p>11</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 2</p>
</td>
<td style="width: 7.02905%;">
<p>3/4</p>
</td>
<td style="width: 7.02905%;">
<p>2</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.45345%;">
<p>&mdash;</p>
</td>
<td style="width: 6.72931%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Numeric Ratio</p>
</td>
<td style="width: 7.02905%;">
<p>1/2</p>
</td>
<td style="width: 7.02905%;">
<p>3/4</p>
</td>
<td style="width: 7.02905%;">
<p>1-1/2</p>
</td>
<td style="width: 7.02905%;">
<p>1-1/2</p>
</td>
<td style="width: 7.59138%;">
<p>1-1/2</p>
</td>
<td style="width: 8.45345%;">
<p>1-1/2</p>
</td>
<td style="width: 6.72931%;">
<p>1-1/2</p>
</td>
<td style="width: 7.59138%;">
<p>1-1/2</p>
</td>
<td style="width: 7.59138%;">
<p>6</p>
</td>
<td style="width: 8.62231%;">
<p>11</p>
</td>
</tr>
<tr>
<td style="width: 20%;" rowspan="4">
<p>Worm Torque at Full Load* (in-lb)</p>
<p>17-4PH Worm</p>
</td>
<td style="width: 18%;">
<p>Standard</p>
</td>
<td style="width: 7.02905%;">
<p>120</p>
</td>
<td style="width: 7.02905%;">
<p>450</p>
</td>
<td style="width: 7.02905%;">
<p>750</p>
</td>
<td style="width: 7.02905%;">
<p>1430</p>
</td>
<td style="width: 7.59138%;">
<p>2050</p>
</td>
<td style="width: 8.45345%;">
<p>2700</p>
</td>
<td style="width: 6.72931%;">
<p>2640</p>
</td>
<td style="width: 7.59138%;">
<p>4000</p>
</td>
<td style="width: 7.59138%;">
<p>7500</p>
</td>
<td style="width: 8.62231%;">
<p>16000</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 1</p>
</td>
<td style="width: 7.02905%;">
<p>50</p>
</td>
<td style="width: 7.02905%;">
<p>185</p>
</td>
<td style="width: 7.02905%;">
<p>400</p>
</td>
<td style="width: 7.02905%;">
<p>820</p>
</td>
<td style="width: 7.59138%;">
<p>1170</p>
</td>
<td style="width: 8.45345%;">
<p>1700</p>
</td>
<td style="width: 6.72931%;">
<p>1685</p>
</td>
<td style="width: 7.59138%;">
<p>2400</p>
</td>
<td style="width: 7.59138%;">
<p>4200</p>
</td>
<td style="width: 8.62231%;">
<p>8600</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 2</p>
</td>
<td style="width: 7.02905%;">
<p>75</p>
</td>
<td style="width: 7.02905%;">
<p>275</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.45345%;">
<p>&mdash;</p>
</td>
<td style="width: 6.72931%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Numeric Ratio</p>
</td>
<td style="width: 7.02905%;">
<p>48</p>
</td>
<td style="width: 7.02905%;">
<p>175</p>
</td>
<td style="width: 7.02905%;">
<p>370</p>
</td>
<td style="width: 7.02905%;">
<p>640</p>
</td>
<td style="width: 7.59138%;">
<p>925</p>
</td>
<td style="width: 8.45345%;">
<p>1500</p>
</td>
<td style="width: 6.72931%;">
<p>1800</p>
</td>
<td style="width: 7.59138%;">
<p>2411</p>
</td>
<td style="width: 7.59138%;">
<p>4040</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 20%;" rowspan="4">
<p>Worm Torque at Full Load* (in-lb)</p>
<p>316SS Worm</p>
</td>
<td style="width: 18%;">
<p>Standard</p>
</td>
<td style="width: 7.02905%;">
<p>42</p>
</td>
<td style="width: 7.02905%;">
<p>150</p>
</td>
<td style="width: 7.02905%;">
<p>253</p>
</td>
<td style="width: 7.02905%;">
<p>471</p>
</td>
<td style="width: 7.59138%;">
<p>675</p>
</td>
<td style="width: 8.45345%;">
<p>926</p>
</td>
<td style="width: 6.72931%;">
<p>940</p>
</td>
<td style="width: 7.59138%;">
<p>1366</p>
</td>
<td style="width: 7.59138%;">
<p>2566</p>
</td>
<td style="width: 8.62231%;">
<p>5466</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 1</p>
</td>
<td style="width: 7.02905%;">
<p>19</p>
</td>
<td style="width: 7.02905%;">
<p>66</p>
</td>
<td style="width: 7.02905%;">
<p>141</p>
</td>
<td style="width: 7.02905%;">
<p>276</p>
</td>
<td style="width: 7.59138%;">
<p>394</p>
</td>
<td style="width: 8.45345%;">
<p>593</p>
</td>
<td style="width: 6.72931%;">
<p>600</p>
</td>
<td style="width: 7.59138%;">
<p>833</p>
</td>
<td style="width: 7.59138%;">
<p>1466</p>
</td>
<td style="width: 8.62231%;">
<p>3000</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 2</p>
</td>
<td style="width: 7.02905%;">
<p>27</p>
</td>
<td style="width: 7.02905%;">
<p>95</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.45345%;">
<p>&mdash;</p>
</td>
<td style="width: 6.72931%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Numeric Ratio</p>
</td>
<td style="width: 7.02905%;">
<p>25</p>
</td>
<td style="width: 7.02905%;">
<p>57</p>
</td>
<td style="width: 7.02905%;">
<p>67</p>
</td>
<td style="width: 7.02905%;">
<p>109</p>
</td>
<td style="width: 7.59138%;">
<p>144</p>
</td>
<td style="width: 8.45345%;">
<p>336</p>
</td>
<td style="width: 6.72931%;">
<p>635</p>
</td>
<td style="width: 7.59138%;">
<p>350</p>
</td>
<td style="width: 7.59138%;">
<p>619</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 20%;" rowspan="4">
<p>Efficiency Rating (%) - 17-4PH Worm</p>
</td>
<td style="width: 18%;">
<p>Standard</p>
</td>
<td style="width: 7.02905%;">
<p>22.1</p>
</td>
<td style="width: 7.02905%;">
<p>22.1</p>
</td>
<td style="width: 7.02905%;">
<p>26.5</p>
</td>
<td style="width: 7.02905%;">
<p>20.9</p>
</td>
<td style="width: 7.59138%;">
<p>22.0</p>
</td>
<td style="width: 8.45345%;">
<p>22.4</p>
</td>
<td style="width: 6.72931%;">
<p>22.4</p>
</td>
<td style="width: 7.59138%;">
<p>17.4</p>
</td>
<td style="width: 7.59138%;">
<p>13.3</p>
</td>
<td style="width: 8.62231%;">
<p>12.4</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 1</p>
</td>
<td style="width: 7.02905%;">
<p>13.3</p>
</td>
<td style="width: 7.02905%;">
<p>9.1</p>
</td>
<td style="width: 7.02905%;">
<p>16.6</p>
</td>
<td style="width: 7.02905%;">
<p>12.1</p>
</td>
<td style="width: 7.59138%;">
<p>12.8</p>
</td>
<td style="width: 8.45345%;">
<p>11.8</p>
</td>
<td style="width: 6.72931%;">
<p>11.8</p>
</td>
<td style="width: 7.59138%;">
<p>9.7</p>
</td>
<td style="width: 7.59138%;">
<p>7.9</p>
</td>
<td style="width: 8.62231%;">
<p>7.7</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 2</p>
</td>
<td style="width: 7.02905%;">
<p>17.7</p>
</td>
<td style="width: 7.02905%;">
<p>18.1</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.45345%;">
<p>&mdash;</p>
</td>
<td style="width: 6.72931%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Numeric Ratio</p>
</td>
<td style="width: 7.02905%;">
<p>13.3</p>
</td>
<td style="width: 7.02905%;">
<p>9.1</p>
</td>
<td style="width: 7.02905%;">
<p>8.6</p>
</td>
<td style="width: 7.02905%;">
<p>7.5</p>
</td>
<td style="width: 7.59138%;">
<p>6.9</p>
</td>
<td style="width: 8.45345%;">
<p>5.3</p>
</td>
<td style="width: 6.72931%;">
<p>5.3</p>
</td>
<td style="width: 7.59138%;">
<p>4.6</p>
</td>
<td style="width: 7.59138%;">
<p>3.9</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 20%;" rowspan="4">
<p>Efficiency Rating (%) - 316SS Worm</p>
</td>
<td style="width: 18%;">
<p>Standard</p>
</td>
<td style="width: 7.02905%;">
<p>20.3</p>
</td>
<td style="width: 7.02905%;">
<p>21.1</p>
</td>
<td style="width: 7.02905%;">
<p>25.1</p>
</td>
<td style="width: 7.02905%;">
<p>20.3</p>
</td>
<td style="width: 7.59138%;">
<p>18.8</p>
</td>
<td style="width: 8.45345%;">
<p>17.9</p>
</td>
<td style="width: 6.72931%;">
<p>17.9</p>
</td>
<td style="width: 7.59138%;">
<p>17.0</p>
</td>
<td style="width: 7.59138%;">
<p>12.9</p>
</td>
<td style="width: 8.62231%;">
<p>12.1</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 1</p>
</td>
<td style="width: 7.02905%;">
<p>10.9</p>
</td>
<td style="width: 7.02905%;">
<p>12.0</p>
</td>
<td style="width: 7.02905%;">
<p>15.0</p>
</td>
<td style="width: 7.02905%;">
<p>11.5</p>
</td>
<td style="width: 7.59138%;">
<p>10.7</p>
</td>
<td style="width: 8.45345%;">
<p>9.3</p>
</td>
<td style="width: 6.72931%;">
<p>9.3</p>
</td>
<td style="width: 7.59138%;">
<p>9.3</p>
</td>
<td style="width: 7.59138%;">
<p>7.5</p>
</td>
<td style="width: 8.62231%;">
<p>7.4</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Optional No. 2</p>
</td>
<td style="width: 7.02905%;">
<p>15.5</p>
</td>
<td style="width: 7.02905%;">
<p>16.8</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.02905%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.45345%;">
<p>&mdash;</p>
</td>
<td style="width: 6.72931%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 7.59138%;">
<p>&mdash;</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Numeric Ratio</p>
</td>
<td style="width: 7.02905%;">
<p>10.9</p>
</td>
<td style="width: 7.02905%;">
<p>8.0</p>
</td>
<td style="width: 7.02905%;">
<p>7.5</p>
</td>
<td style="width: 7.02905%;">
<p>5.8</p>
</td>
<td style="width: 7.59138%;">
<p>5.4</p>
</td>
<td style="width: 8.45345%;">
<p>4.5</p>
</td>
<td style="width: 6.72931%;">
<p>5.0</p>
</td>
<td style="width: 7.59138%;">
<p>4.5</p>
</td>
<td style="width: 7.59138%;">
<p>3.6</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 20%;" rowspan="2">
<p>Key Torque (in-lb) - 17-4PH Worm</p>
</td>
<td style="width: 18%;">
<p>Std. &amp; Opt.</p>
</td>
<td style="width: 7.02905%;">
<p>460</p>
</td>
<td style="width: 7.02905%;">
<p>1750</p>
</td>
<td style="width: 7.02905%;">
<p>4700</p>
</td>
<td style="width: 7.02905%;">
<p>7580</p>
</td>
<td style="width: 7.59138%;">
<p>10625</p>
</td>
<td style="width: 8.45345%;">
<p>14000</p>
</td>
<td style="width: 6.72931%;">
<p>16800</p>
</td>
<td style="width: 7.59138%;">
<p>26500</p>
</td>
<td style="width: 7.59138%;">
<p>47110</p>
</td>
<td style="width: 8.62231%;">
<p>118200</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Numeric Ratio</p>
</td>
<td style="width: 7.02905%;">
<p>460</p>
</td>
<td style="width: 7.02905%;">
<p>1599</p>
</td>
<td style="width: 7.02905%;">
<p>4077</p>
</td>
<td style="width: 7.02905%;">
<p>6645</p>
</td>
<td style="width: 7.59138%;">
<p>9369</p>
</td>
<td style="width: 8.45345%;">
<p>11474</p>
</td>
<td style="width: 6.72931%;">
<p>13770</p>
</td>
<td style="width: 7.59138%;">
<p>18561</p>
</td>
<td style="width: 7.59138%;">
<p>30970</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 20%;" rowspan="2">
<p>Key Torque (in-lb) - 316SS Worm</p>
</td>
<td style="width: 18%;">
<p>Std. &amp; Opt.</p>
</td>
<td style="width: 7.02905%;">
<p>153</p>
</td>
<td style="width: 7.02905%;">
<p>581</p>
</td>
<td style="width: 7.02905%;">
<p>1565</p>
</td>
<td style="width: 7.02905%;">
<p>2527</p>
</td>
<td style="width: 7.59138%;">
<p>3538</p>
</td>
<td style="width: 8.45345%;">
<p>4665</p>
</td>
<td style="width: 6.72931%;">
<p>5600</p>
</td>
<td style="width: 7.59138%;">
<p>8828</p>
</td>
<td style="width: 7.59138%;">
<p>15697</p>
</td>
<td style="width: 8.62231%;">
<p>39396</p>
</td>
</tr>
<tr>
<td style="width: 18%;">
<p>Numeric Ratio</p>
</td>
<td style="width: 7.02905%;">
<p>211</p>
</td>
<td style="width: 7.02905%;">
<p>460</p>
</td>
<td style="width: 7.02905%;">
<p>551</p>
</td>
<td style="width: 7.02905%;">
<p>959</p>
</td>
<td style="width: 7.59138%;">
<p>1199</p>
</td>
<td style="width: 8.45345%;">
<p>2328</p>
</td>
<td style="width: 6.72931%;">
<p>2800</p>
</td>
<td style="width: 7.59138%;">
<p>2358</p>
</td>
<td style="width: 7.59138%;">
<p>4087</p>
</td>
<td style="width: 8.62231%;">
<p>&mdash;</p>
</td>
</tr>
<tr>
<td style="width: 38%;" colspan="2">
<p>Weight with 6 inch Stroke (Raise) (lb)</p>
</td>
<td style="width: 7.02905%;">
<p>17</p>
</td>
<td style="width: 7.02905%;">
<p>35</p>
</td>
<td style="width: 7.02905%;">
<p>52</p>
</td>
<td style="width: 7.02905%;">
<p>66</p>
</td>
<td style="width: 7.59138%;">
<p>93</p>
</td>
<td style="width: 8.45345%;">
<p>160</p>
</td>
<td style="width: 6.72931%;">
<p>160</p>
</td>
<td style="width: 7.59138%;">
<p>240</p>
</td>
<td style="width: 7.59138%;">
<p>410</p>
</td>
<td style="width: 8.62231%;">
<p>1200</p>
</td>
</tr>
<tr>
<td style="width: 38%;" colspan="2">
<p>Weight per additional 1 inch Stroke (Raise) (lb)</p>
</td>
<td style="width: 7.02905%;">
<p>0.3</p>
</td>
<td style="width: 7.02905%;">
<p>0.9</p>
</td>
<td style="width: 7.02905%;">
<p>1.4</p>
</td>
<td style="width: 7.02905%;">
<p>1.5</p>
</td>
<td style="width: 7.59138%;">
<p>2.6</p>
</td>
<td style="width: 8.45345%;">
<p>2.5</p>
</td>
<td style="width: 6.72931%;">
<p>2.5</p>
</td>
<td style="width: 7.59138%;">
<p>3.7</p>
</td>
<td style="width: 7.59138%;">
<p>5.5</p>
</td>
<td style="width: 8.62231%;">
<p>9.0</p>
</td>
</tr>
<tr>
<td style="width: 112.695%;" colspan="12">
<p>Note: For loads from 25% to 100% of actuator capacity, torque requirements are approximately proportional to the load. Contact Duff-Norton Customer Service for motorized performance.</p>
</td>
</tr>
</tbody>
</table>

Documents

Brochures & Catalogues

[Catalogs] Screw Jacks Design Guide [Brochure] Duff-Norton Capabilities Brochure S1

Manuals & Supplements

[Technical Bulletin] Screw Jack Application Analysis Form

Product & Data Sheets

[Product Sheet] Stainless Steel Actuator Product Sheet

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