Airtac SCJ40 Standard Cylinder SCJ40X400-75
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X400-75 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke400 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X400-75
The SCJ40X400-75 is a double-acting, single-rod pneumatic cylinder that integrates a rear-cap adjusting screw, giving you up to 75 mm of field-adjustable stroke-end control without changing the cylinder body. With a 40 mm bore, it delivers 628 N of push force at 0.5 MPa and 1130 N at 0.9 MPa, using a 16 mm diameter piston rod and PT1/4 ports.
This model's 400 mm nominal stroke is well within the 1200 mm maximum standard stroke for the 40 mm bore. The adjustable screw lets technicians fine-tune the end position during commissioning, format changeovers, or to compensate for tooling wear, eliminating the need for external hard stops. The body length A(SCJ) is 185 mm, and it features a 21 mm air cushion for smooth deceleration.
Airtac SCJ40 Standard Cylinder SCJ40X400-75 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X400-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 400 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 SCJ40X400-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SCJ40X400-75 Is Used
Commissioning & Setup
The 75 mm adjustment range allows engineers to dial in the exact stroke end position on a new machine without fabricating custom stops, speeding up initial system integration and debugging.
Product Format Changeover
Quickly adapt the cylinder's end stop for different product sizes on a packaging or sorting line. The rear screw adjustment is far faster than swapping out a fixed-stroke cylinder for each format.
Wear Compensation
In clamping or pressing applications, the adjustable stroke can be extended slightly over time to compensate for pad or tooling wear, maintaining consistent clamping force without replacing components.
Is the Airtac SCJ40 Standard Cylinder SCJ40X400-75 the Right Cylinder?
Choose the SCJ40X400-75 when your application requires a 400 mm maximum stroke with the ability to shorten the end position by up to 75 mm on the machine. If you need more force, stepping up to the 50 mm bore SCJ50 series provides 982 N of push at 0.5 MPa. For applications where the stroke length is fixed and never needs adjustment, the standard SC40 series offers a more economical, fixed-stroke alternative. A direct replacement must match the 40 mm bore, 400 mm nominal stroke, 75 mm adjust range, PT port thread, and basic mounting style. For this 400 mm stroke, ensure the rod is not subjected to high side loads; if lateral forces are present, add an external guide rail or consider a guided cylinder to prevent rod bending and 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 SCJ40X400-75 FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The pull force is lower because the 16 mm piston rod reduces the effective area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 128 kgf.
It is a direct replacement for another AirTAC SCJ40 adjustable-stroke cylinder with a 400 mm nominal stroke and 75 mm adjust range. Ensure the port thread (PT), mounting style, and magnet option match your existing setup. It is not dimensionally interchangeable with ISO 15552 cylinders.
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