Navtec double rod cylinders were engineered and designed by Navtec for use in dual pull application, usually with a block and tackle incorporated. Navtec originally engineered these cylinders as a solution to operate main sheet travelers. They are also commonly used to operate genoa lead systems as well as many custom applications. Navtec will work with any marine hardware manufacturer to provide a cylinder that interfaces with their hardware to operate any double acting needs.
| Part Number | Cylinder Size | Cap Thread | Zero Stroke Length | Weight STD Aluminum |
| A254-006-J_ _ _* | -6 | 1 1/18-16 unf 2a | 11.9″ (301mm) | 1.2 + .1 lbs/in of stroke (.55 + .02 kg +kg/cm stroke) |
| A254-010-J_ _ _* | -10 | 1 7/16-16 unf 2a | 13.4″ (341mm) | 2.2 + .1 lbs +lbs/in stroke (.97 + .02 kg +kg/cm stroke) |
| A254-012-J_ _ _* | -12 | 1 5/8-16 unf 2a | 14.8″ (377mm) | 3.5 + .2 lbs +lbs/in stroke (1.58 + .04 kg +kg/cm stroke) |
| A254-017-J_ _ _* | -17 | 1 7/8-16 unf 2a | 15.1″ (384mm) | 4.3 + .2 lbs +lbs/in stroke (1.93 + .04 kg +kg/cm stroke) |
| A254-022-J_ _ _* | -22 | 2 1/8-16 unf 2a | 18.1″ (461mm) | 6.7 + .3 lbs +lbs/in stroke (3.02 + .05 kg +kg/cm stroke) |
| A254-030-J_ _ _* | -30 | 2 5/8-16 unf 2a | 18.9″ (481mm) | 11.1 + .5 lbs +lbs/in stroke (5.02 + .09 kg +kg/cm stroke) |
| A254-040-J_ _ _* | -40 | 3 1/4-16 unf 2a | 20.6″ (522mm) | 18.2 + .8 lbs +lbs/in stroke (8.22 + .13 kg +kg/cm stroke) |
| A254-048-J_ _ _* | -48 | 3 1/4-16 unf 2a | 20.6″ (522mm) | 18.1 + .8 lbs +lbs/in stroke (8.22 + .13 kg +kg/cm stroke) |
| A254-060-J_ _ _* | -60 | 3 3/4-16 unf 2a | 22.9″ (582mm) | 27.3 + 1.0 lbs +lbs/in stroke (12.37 + .17 kg +kg/cm stroke) |
| A254-076-J_ _ _* | -76 | 3 3/4-16 unf 2a | 22.9″ (582mm) | 27.2 + 1.0 lbs +lbs/in stroke (12.36 + .17 kg +kg/cm stroke) |
| A254-090-J_ _ _* | -90 | 4 3/8-8 unf 2a | 32.7″ (830mm) | 44.3 + 1.5 lbs +lbs/in stroke (20.10 + .27 kg +kg/cm stroke) |
| A254-110-J_ _ _* | -110 | 4 7/8-8 unf 2a | 33.2″ (843mm) | 64.8 + 1.7 lbs +lbs/in stroke (29.39 + .30 kg +kg/cm stroke) |
| A254-150-J_ _ _* | -150 | 5 3/8-8 unf 2a | 35.2″ (895mm) | 89.6 + 2.6 lbs +lbs/in stroke (40.65 + .47 kg +kg/cm stroke) |
| A254-260-J_ _ _* | -260 | 7-8 unf 2a |
Max relief setting is 5,000 psi. See A250 HP Cylinder information for all other technical data. Cylinders are designed on an individual basis. *Specify desired stroke length when ordering. Overall cylinder length equals zero stroke length plus two times the desired stroke.
Lewmar blocks are the ideal choice for the control lines leading from your A254 Cylinder to the traveler car. The chart below lists the adapters that allow you to connect Lewmar blocks directly to the Navtec cylinder rods on your A254 Cylinder. Please contact Navtec or Lewmar for help picking the exact blocks needed to drive your traveler car.
| Lewmar Adaptor Part Number | Ram Size | Rod THD | Block Size | Lewmar Block Part Number | Max System Pressure |
| 29914080 | -6 | 7/16 RH | 60mm | 29942601 | 5000 psi / 350 Bar |
| 29914081 | -10 | 1/2 RH | 80mm | 29942801/29902808 | 5000 psi / 350 Bar |
| 29914082 | -12 | 5/8 RH | 105mm | 29902108 | 5000 psi / 350 Bar |
| 29914083 | -17 | 5/8 RH | 130mm | 29902138 | 5000 psi / 350 Bar |
| 29914084 | -22 | 3/4 RH | 130mm | 29902138 | 5000 psi / 350 Bar |
| 29914085 | -30 | 7/8 RH | 130mm | 29912101 | 5000 psi / 350 Bar |
| 29914086 | -10 | 1/2 RH | 60mm | 29942601 | 3000 psi / 250 Bar |
| 29914087 | -12 | 5/8 RH | 80mm | 29942801/29902808 | 3000 psi / 250 Bar |
| 29914088 | -17 | 5/8 RH | 105mm | 29902108 | 3000 psi / 250 Bar |
| 29914089 | -22 | 3/4 RH | 130mm | 29902138 | 3000 psi / 250 Bar |
| 29914090 | -30 | 7/8 RH | 130mm | 29902138 | 3000 psi / 250 Bar |
| Lewmar Adaptor Part Number | Ram Size | Rod THD | Block Size | Lewmar Block Part Number | Max System Pressure |
| 29914091 | -6 | 7/16 LH | 60mm | 29942601 | 5000 psi / 350 Bar |
| 29914092 | -10 | 1/2 LH | 80mm | 29942801/29902808 | 5000 psi / 350 Bar |
| 29914093 | -12 | 5/8 LH | 105mm | 29902108 | 5000 psi / 350 Bar |
| 29914094 | -17 | 5/8 LH | 130mm | 29902108 | 5000 psi / 350 Bar |
| 29914095 | -22 | 3/4 LH | 130mm | 29902138 | 5000 psi / 350 Bar |
| 29914096 | -30 | 7/8 LH | 130mm | 29912101 | 5000 psi / 350 Bar |
| 29914097 | -10 | 1/2 LH | 60mm | 29942601 | 3000 psi / 250 Bar |
| 29914098 | -12 | 5/8 LH | 80mm | 29942801/29902808 | 3000 psi / 250 Bar |
| 29914199 | -17 | 5/8 LH | 105mm | 29902108 | 3000 psi / 250 Bar |
| 29914100 | -22 | 3/4 LH | 130mm | 29902138 | 3000 psi / 250 Bar |
| 29914101 | -30 | 7/8 LH | 130mm | 29902138 | 3000 psi / 250 Bar |
