Airtac SCJ40 Standard Cylinder SCJ40X400-20
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X400-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 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-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X400-20
The SCJ40X400-20 is a double-acting, single-rod pneumatic cylinder that puts fine stroke tuning directly on the machine. Its rear-cap adjusting screw lets you shorten the stroke end by up to 20 mm without swapping the cylinder, making it ideal for commissioning trials or format changeovers. The 40 mm bore delivers 628 N of push force at 0.5 MPa, driven by a 16 mm diameter piston rod through PT1/4 ports.
Built on a proven tie-rod platform, this cylinder includes an adjustable air cushion (21 mm long) to decelerate the 400 mm stroke smoothly. The body length A(SCJ) is 185 mm, slightly longer than a fixed-stroke SC to house the adjustment mechanism. It operates on filtered air from 0.15 to 1.0 MPa and handles ambient temperatures from -20 to +70 °C with its standard TPU seals.
Airtac SCJ40 Standard Cylinder SCJ40X400-20 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X400-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 20 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 SCJ40X400-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -20 | 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 SCJ40X400-20 Is Used
End-Stop Commissioning
Fine-tune the 400 mm stroke end position during machine setup without removing the cylinder. The 20 mm adjustment screw allows precise mechanical alignment with mating tooling.
Format Changeover
Quickly adapt a pusher or stop gate to different product sizes on a packaging line. The rear screw adjusts the stroke end in seconds, minimizing downtime between batches.
Wear Compensation
Take up mechanical play in a long-stroke clamping or pressing fixture. As tooling surfaces wear, the 20 mm adjustment range restores the correct end position without disassembly.
Is the Airtac SCJ40 Standard Cylinder SCJ40X400-20 the Right Cylinder?
Choose the SCJ40X400-20 when you need to dial in a 400 mm stroke end position during setup or after wear. If you need more force, stepping up to the 50 mm bore provides 982 N of push at 0.5 MPa; for a lighter, more compact solution, the 32 mm bore offers 402 N. This adjustable-stroke model is the right pick over a fixed-stroke SC when the exact end position is unknown at the time of order.
For a direct replacement, match the 40 mm bore, 400 mm nominal stroke, 20 mm adjust range, PT port thread, and basic mounting. For strokes of this length, be mindful of side loads that could bend the 16 mm rod; if the load is not guided, add an external guide rail or consider a guided cylinder to protect the rod and bearing.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ40X400-20 FAQ
At 0.5 MPa, the cylinder pushes with 628 N and pulls with 528 N (the lower pull force is due to the 16 mm rod reducing the piston area on the return stroke). The maximum push force at the 0.9 MPa operating limit is 1130 N.
A screw in the rear cap sets the stroke end position, allowing you to shorten the nominal 400 mm stroke by up to 20 mm. It is a direct replacement for a fixed-stroke SC when you need field adjustability, but the body is slightly longer. Always match the bore, nominal stroke, adjust range, and port thread for compatibility.
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