Airtac SCJ40 Standard Cylinder SCJ40X150-20
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X150-20 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, 150mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke150 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X150-20
The SCJ40X150-20 puts a 20 mm field-adjustable stroke-end screw into a 40 mm bore single-rod cylinder, giving you 628 N of push force at 0.5 MPa (1130 N at 0.9 MPa) without swapping the cylinder body. The 16 mm diameter piston rod and PT1/4 ports keep it compact, while the rear screw lets you dial in the exact end position during commissioning or after tooling wear—no external hard stops needed.
Built on the same tie-rod platform as the fixed-stroke SC series, this adjustable-stroke variant adds a 185 mm body length A dimension and retains the 21 mm air cushion for smooth deceleration. It handles filtered air at 0.15–1.0 MPa and operates from -20 to +70 °C with its standard TPU seals, making it a practical drop-in where stroke fine-tuning is a daily requirement.
Airtac SCJ40 Standard Cylinder SCJ40X150-20 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X150-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 150 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 SCJ40X150-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×150 | 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 SCJ40X150-20 Is Used
Commissioning & Fine-Tuning
Dial in the exact stroke end position on a new assembly line without cutting rods or adding external stops. The 20 mm rear screw lets technicians adjust the 150 mm nominal stroke in seconds.
Format Changeovers
Packaging machines that switch between product sizes use the SCJ40X150-20 to reset the pusher stroke quickly. One cylinder covers multiple formats instead of stocking several fixed-stroke units.
Wear Take-Up
In clamping or pressing fixtures, the adjustable screw compensates for pad wear over thousands of cycles. Operators restore the original clamp position without disassembling the tooling.
Is the Airtac SCJ40 Standard Cylinder SCJ40X150-20 the Right Cylinder?
Step up to the 50 mm bore SCJ (982 N push at 0.5 MPa) if your load demands more force, or down to the 32 mm bore (402 N) for lighter, faster-cycling tasks. This SCJ40X150-20 is the right call when you need to tweak the stroke end repeatedly—think format changeovers or wear compensation—rather than locking into a fixed stroke with an SC cylinder. For strokes of 300 mm or longer, watch for side-loading on the 16 mm rod; an external guide rail or a guided cylinder prevents rod bending and premature seal wear.
When replacing, match the bore (40 mm), nominal stroke (150 mm), adjust range (-20), and port thread (PT). The basic mount configuration accepts SCJ-compatible FA front flange, LB foot, or TC centre trunnion accessories (no FB or clevis mounts). If you need piston position sensing, order the -S magnet version so CMSG/DMSG sensors can clamp directly onto the barrel.
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 SCJ40X150-20 FAQ
At 0.5 MPa, the 40 mm bore generates 628 N pushing and 528 N pulling (the difference comes from the 16 mm rod area on the return side). At the maximum operating pressure of 1.0 MPa, push force reaches 1256 N. Always size for the lower pull force if the cylinder does work in both directions.
Yes, the SCJ40X150-20 shares the same bore, rod, port, and mounting footprint as the SC40X150 but adds a rear adjusting screw that shortens the stroke end by up to 20 mm. The body length A is 185 mm (slightly longer than the fixed-stroke version). Ensure your machine has clearance for the rear adjuster and confirm the port thread (PT) matches your existing fittings.
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