Automotion Components Anti-Stiction
General Guidance
L4500 - L4510 Sizes Bore diameter 9.3mm.
Double Acting Units
Universal mount includes: rear pivot mount, front rear stud mount.
Front stud mount.
Front rear stud mount.
Double Rod End
Universal mount includes: rear pivot mount, front rear stud mount.
Single Acting Units - air extend, spring return
Air extend, spring return.
Air extend, spring return, front stud mount.
L4520 - L4530 Sizes Bore diameter 15.9mm.
Double Acting Units
Universal mount includes: rear pivot mount, front rear stud mount.
Front stud mount.
Front rear stud mount.
Double Rod End
Universal mount includes: rear pivot mount, front rear stud mount.
Single Acting Units - air extend, spring return
Air extend, spring return.
Air extend, spring return, front stud mount.
L4540 - L4548 Sizes Bore diameter 24mm.
Double Acting Units
Universal mount includes: rear pivot mount, front rear stud mount.
Front stud mount.
Front rear stud mount.
Single Acting Units - air extend, spring return
Air extend, spring return.
Air extend, spring return, front stud mount.
L4556 - L4558 Sizes Bore diameter 32.5mm.
Double Acting Units
Features
What is stiction?
Stiction is the problem that causes air cylinders to stick at the start of the stroke - resulting in erratic breakaway motion. Technically it’s the difference between static friction and moving friction when static friction is higher. Our Anti-Stiction Air Cylinders do away with any perceptible stiction and reduces running friction to exceedingly low levels. This gives them the unique ability to impart super smooth motion, smoother than any other air cylinder.
Features and benefits
Ultra Low Friction - In conventional air cylinders there is a design trade-off . No air leakage in exchange for higher stiction and running friction. Our Anti-Stiction Air Cylinders chose to go the other way. A little air leakage, which is not relevant in most applications, in return for ultra low friction.
The Anti-Stiction Air Cylinders use a precision fit graphite piston which slides freely, without lubrication, inside a glass cylinder. No corrosion and no need for lubrication - our glass cylinders are encased in a stainless steel sleeve with a small space in between which provides excellent impact protection, so much so that the outside wall can be dented without affecting the glass liner. If you dent a conventional air cylinder, you can expect its operation to be severely impaired because the piston rides against the exposed cylinder. They can operate at extreme temperatures, at very high speeds and cycle rates. They also run cleaner than typical air cylinders as they contain no oil or grease. They have no rubber or plastic seals to wear out or harden with time.
Product Selection Chart
Anti-Stiction Air Cylinder or Actuator?
Both employ a unique combination of glass cylinder and graphite piston and have similar performance properties with respect to friction, cleanliness, and temperature range. The major diff erences are in the actuation direction capabilities, outer construction, mounting features, and dimensions. The chart below offers a quick comparison between the two:
| Anti-stiction Air Cylinder | Actuator | |
| Double Acting Capability | • | |
| Can Actuate From Rod End | • | |
| Outer Steel Case | • | |
| Double Rod Models | • | |
| Can Pivot Cylinder | • | • |
| Can Vacuum Actuate | • | • |
| Pressure One Way, Spring Retract | • | |
| Greatest Rod Angle | • | |
| Least Possible Friction | • | |
| Lowest Pressure Response | • | |
| Most Compact | • | |
| Least Mass/Weight | • | |
| Highest Degree of Cleanliness | • | |
| Useful for Pumping | • |
| L4500 - L4510 | L4520 - L4530 | L4540 - L4548 | L4556 - L4558 | |
| Bore (mm) | 9.3 | 15.9 | 24.0 | 32.5 |
| Piston area (sq. mm) | 67.7 | 198 | 452.5 | 830 |
| Max pressure (MPa) | 0.7 | 0.7 | 0.7 | 0.7 |
| Suitable for vacuum actuation? | Yes | Yes | Yes | No |
| Force output at max pressure on the rear side (newtons) | 47.4 | 139 | 316.6 | 581 |
| Force output at max pressure on the rod side (newtons) | 42 | 125 | 294.5 | 526 |
| Force factor rear side (factor x pressure [MPa] = force output [N]) | 67.7 | 198 | 452.5 | 830 |
| Force factor rod side (factor x pressure [MPa] = force output [N]) | 60 | 178 | 420.8 | 751 |
| Min pressure differential required for actuation (MPa) | <0.0015 | <0.0015 | <0.0015 | <0.0035 |
| Piston friction as % of load (without side load) | 1 to 2% | 1 to 2% | 1 to 2% | 1 to 2% |
| Operating temperature range | -55°C to +150°C | -55°C to +150°C | -55°C to +150°C | -55°C to +150°C |
| Weight of piston/rod assy (grams) Single rod end models | 4.5 + (0.375 x stroke) | 16 + (0.142 x stroke) | 41.4 + (0.254 x stroke) | 82.6 + (0.56 x stroke) |
| Weight of piston/rod assy (grams) Double rod end models | 8.87 + (0.064 x stroke) | 28.48 + (0.315 x stroke) | 74.28 + (0.509 x stroke) | |
| Weight of complete unit (grams) Single rod end models | 31.7 + (0.375 x stroke) | 64.6 + (0.622 x stroke) | 157.18 + (1.225 x stroke) | 616 + (3.66 x stroke) |
| Weight of complete unit (grams) Double rod end models | 41.02 + (0.462 x stroke) | 80.45 + (0.854 x stroke) | 204.9 + (0.462 x stroke) |
Max Leak at Reference Pressures
| At pressure MPa = | 0.34 | 0.34 | 0.34 | 0.34 |
| Max leak rate by piston: SL/min* | 1.16 | 1.39 | 2.2 | 2.2 |
| Max leak rate by rod: SL/min* | 2.2 | 2.6 | 2.6 | 2.0 |
Note: Lower leak rates are available for both imperial and metric models on request. Please contact our technical department for more information.
