Airtac SCJ40 Standard Cylinder SCJ40X25-30STC
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X25-30STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø40mm bore, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke25 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X25-30STC
The SCJ40X25-30STC is a 40 mm bore double-acting, single-rod cylinder that puts fine stroke-end tuning directly on the machine. Its rear adjusting screw provides up to 30 mm of retraction from the 25 mm nominal stroke, so operators can dial in the exact end position during commissioning or format changes without swapping the cylinder. The built-in magnet and center trunnion mount complete a ready-to-install solution for pivoting applications.
With a 16 mm diameter rod and PT1/4 ports, this tie-rod cylinder delivers 628 N of push force at 0.5 MPa. The 21 mm air cushion at each end decelerates the piston quietly, and the TPU seals handle standard temperatures from -20 to +70 °C. The SCJ body length A is 185 mm, making it a compact choice where space is tight but adjustability is non-negotiable.
Airtac SCJ40 Standard Cylinder SCJ40X25-30STC Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X25-30STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 30 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 SCJ40X25-30STC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×25 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ40X25-30STC Is Used
Commissioning & Setup
Fine-tune the stroke end position on new assembly stations without cutting rods or adding external hard stops, accelerating machine bring-up.
Format Changeover
Quickly adjust a pusher or diverter stroke when packaging lines switch between product sizes, minimizing downtime between runs.
Wear Take-Up
Compensate for tooling or gripper pad wear over time by slightly extending the effective stroke via the rear screw, maintaining consistent contact.
Is the Airtac SCJ40 Standard Cylinder SCJ40X25-30STC the Right Cylinder?
Choose the SCJ40 when you need field-adjustable stroke in a mid-range force class. If 628 N push at 0.5 MPa is insufficient, stepping up to a 50 mm bore (SCJ50) raises push force to 982 N. For applications that don't require stroke adjustment, the fixed-stroke SC40 series offers a simpler, cost-effective alternative. A direct replacement must match the 40 mm bore, 25 mm nominal stroke, 30 mm adjust range, PT thread, TC center trunnion mount (with TCM1 bracket, order code F-SC40TC), and the -S magnet for sensor compatibility.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ40X25-30STC FAQ
At 0.5 MPa, the cylinder provides 628 N of push force (full bore area) and 528 N of pull force (annular area minus the 16 mm rod). The maximum operating pressure is 1.0 MPa, yielding a theoretical push force of 1130 N at 0.9 MPa.
You can if the mounting and porting match, but the SCJ body is longer to house the adjustment screw. For a direct SCJ replacement, ensure the bore (40 mm), nominal stroke (25 mm), adjust range (30 mm), center trunnion mount (F-SC40TC), and magnet option (-S) are identical.
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