Airtac SCJ40 Standard Cylinder SCJ40X450-75
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X450-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø40mm bore, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke450 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X450-75
The SCJ40X450-75 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides a 75 mm field-adjustable stroke range, letting you fine-tune the stroke end position on the machine without swapping the cylinder. With a 40 mm bore and 16 mm piston rod, it delivers 628 N of push force at 0.5 MPa (1130 N at 0.9 MPa), making it a capable mid-range actuator for applications where the stroke length must be dialed in during commissioning or changeover.
This adjustable-stroke model shares the same robust tie-rod construction as the fixed-stroke SC series but adds a stroke-end screw for on-the-fly adjustment. It features a PT1/4 port, an M12x1.25 rod thread, and a 21 mm air cushion for smooth deceleration. The body length A(SCJ) is 185 mm plus stroke, and the standard stroke of 450 mm is well within the 1200 mm maximum for this bore.
Airtac SCJ40 Standard Cylinder SCJ40X450-75 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X450-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac SCJ40 Standard Cylinder SCJ40X450-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×450 | Nominal (maximum) stroke length in mm. |
| -75 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac SCJ40 Standard Cylinder SCJ40X450-75 Is Used
Commissioning & Process Tuning
The 75 mm adjustment range allows technicians to precisely set the end-of-stroke position during machine setup, eliminating the need to stock multiple fixed-stroke cylinders for trial-and-error fitting.
Format Changeovers
Ideal for packaging or assembly lines that handle different product sizes. The stroke can be quickly re-adjusted to accommodate a new box height or part width, reducing downtime between batches.
Wear Compensation
In clamping or pressing applications, the adjustable screw can be used to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent clamping force without reprogramming the machine.
Is the Airtac SCJ40 Standard Cylinder SCJ40X450-75 the Right Cylinder?
Choose the SCJ40X450-75 when you need a 40 mm bore actuator with a nominal 450 mm stroke and the ability to shorten the stroke end by up to 75 mm for process tuning. If you need more force, step up to the 50 mm bore SCJ50 series, which provides 982 N of push at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC40 series is a simpler alternative. A direct replacement must match the 40 mm bore, 450 mm nominal stroke, 75 mm adjust range, PT port thread, and basic mounting.
For this 450 mm stroke length, be mindful of side loading on the 16 mm rod. If the load is not guided and applies a lateral force, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ40 Standard Cylinder SCJ40X450-75 FAQ
At the standard operating pressure of 0.5 MPa, this double-acting cylinder produces 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. The pull force is lower because the piston rod reduces the effective area on the return stroke.
A rear-cap screw lets you shorten the stroke end by up to 75 mm from the 450 mm nominal maximum. It is a direct physical stop for the piston, not a speed control. It can replace a fixed-stroke SC40 cylinder if you need field adjustability, provided the bore, port thread (PT), and mounting style match. The SCJ body is slightly longer to house the adjustment mechanism.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SCJ Adjustable-Stroke Cylinders
Request a Quote for Airtac SCJ40 Standard Cylinder SCJ40X450-75
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.