Airtac SCJ40 Standard Cylinder SCJ40X1200-100S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X1200-100S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø40mm bore, 1200mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke1200 mm
- Stroke adjust-100 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X1200-100S
The SCJ40X1200-100S is a tie-rod, double-acting single-rod cylinder with a 40 mm bore and a maximum nominal stroke of 1200 mm, equipped with a rear adjusting screw that provides a 100 mm field-adjustable range to fine-tune the stroke end position. At 0.5 MPa, it delivers 628 N of push force and 528 N of pull force, using a 16 mm diameter piston rod and PT1/4 ports.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG/DMSG/EMSG sensors along the barrel for reliable end-of-stroke or mid-stroke position feedback without extra brackets. The adjustable cushion and TPU seals support speeds from 30 to 800 mm/s in standard operating conditions from -20 to +70 °C.
Airtac SCJ40 Standard Cylinder SCJ40X1200-100S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X1200-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 1200 mm |
| Stroke adjustment | Up to 100 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 SCJ40X1200-100S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×1200 | Nominal (maximum) stroke length in mm. |
| -100 | 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 SCJ40X1200-100S Is Used
End-Stop Commissioning
The 100 mm adjustable stroke allows engineers to dial in the precise end-of-travel position during initial machine setup, compensating for accumulated tolerances in welded frames or assembly tooling without re-machining hard stops.
Long-Stroke Material Transfer
Ideal for a 1200 mm conveyor pusher or diverter, the rear screw lets operators tweak the push-off point by up to 100 mm to handle different product widths on the same line, reducing mechanical changeover time.
Wear Compensation in Clamping
In high-cycle clamping fixtures, the stroke can be progressively extended via the adjusting screw to compensate for jaw or pad wear, maintaining consistent clamp force without immediately replacing wear parts.
Is the Airtac SCJ40 Standard Cylinder SCJ40X1200-100S the Right Cylinder?
Step up to the 50 mm bore SCJ50 series if you need a push force increase to 982 N at 0.5 MPa; step down to the 32 mm bore for a more compact 402 N push force. This SCJ adjustable-stroke model is the right choice when commissioning or format changes demand on-machine stroke tuning, but if your application has a fixed, repeatable stroke, the standard SC series offers a simpler and more cost-effective solution. For a 1200 mm stroke, carefully manage side loads with an external guide rail or switch to a guided cylinder to prevent rod bending. A direct replacement must match the 40 mm bore, 1200 mm nominal stroke, 100 mm adjust range, PT port thread, and the built-in magnet configuration.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-100)
- ✓ 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 SCJ40X1200-100S FAQ
A screw in the rear cap physically limits the piston's retraction. Turning it changes the stroke end position by up to 100 mm, shortening the effective stroke from the 1200 mm maximum. It only adjusts the stroke length, not the cylinder's force or speed.
At the standard 0.5 MPa operating pressure, it generates 628 N of push force and 528 N of pull force. The pull force is lower due to the 16 mm piston rod reducing the effective piston area on the return stroke.
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