Airtac SCJ40 Standard Cylinder SCJ40X40-20TC
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X40-20TC 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, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke40 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X40-20TC
The SCJ40X40-20TC is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly into your hands via a rear-cap adjusting screw. With a 40 mm bore and a nominal 40 mm stroke, you can shorten the end position by up to 20 mm without removing the cylinder or adding external hard stops—ideal for commissioning tweaks and format changeovers. The centre trunnion mount (F-SC40TC, supplied with TCM1 bracket) lets the body pivot, absorbing misalignment in swinging applications.
At 0.5 MPa, this cylinder delivers 628 N of push force and 528 N on the pull stroke, thanks to its 16 mm diameter piston rod. The adjustable air cushion (21 mm length) decelerates the piston quietly at each end, and the PT1/4 port threads keep plumbing straightforward. The body length A is 185 mm, making it a compact yet capable actuator for machinery where stroke precision matters.
Airtac SCJ40 Standard Cylinder SCJ40X40-20TC Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X40-20TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 40 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 SCJ40X40-20TC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 SCJ40X40-20TC Is Used
Commissioning & Setup
Field technicians can fine-tune the retract stroke end by up to 20 mm to perfectly align a stop position during machine setup, eliminating the need for shims or custom end caps.
Product Changeover
On a packaging line, quickly adjust the stroke to accommodate a new box size. The rear screw makes format changes fast without swapping the cylinder or re-plumbing.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can be gradually extended to compensate for pad wear or tooling changes, maintaining consistent clamping force over time.
Is the Airtac SCJ40 Standard Cylinder SCJ40X40-20TC the Right Cylinder?
Choose the SCJ40X40-20TC when you need to dial in a stroke end position on the fly. If 628 N of push force is marginal, stepping up to the SCJ50 bore provides 982 N at the same 0.5 MPa pressure. For applications that do not require stroke adjustment, the fixed-stroke SC40 cylinder offers a simpler, cost-effective alternative. Should the load need full guidance against side forces, consider pairing the cylinder with an external guide or switching to a guided cylinder.
As a direct replacement, match the 40 mm bore, 40 mm nominal stroke, 20 mm adjustable range, PT port thread, and centre trunnion (TC) mounting with the TCM1 bracket. This cylinder is a tie-rod design and does not interchange with ISO 15552 profiles.
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 SCJ40X40-20TC FAQ
A screw in the rear cap limits how far the piston can retract. Turning the screw shortens the stroke end by up to 20 mm from the nominal 40 mm. It adjusts the mechanical stop position, not the air pressure or speed.
At the standard 0.5 MPa operating pressure, it generates 628 N pushing out and 528 N pulling in. The maximum push force at 0.9 MPa is 1130 N. The pull force is lower because the 16 mm rod reduces the effective piston area on the return stroke.
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