Airtac SCJ40 Standard Cylinder SCJ40X1000-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X1000-20S 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, 1000mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke1000 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X1000-20S
The SCJ40X1000-20S is a 40 mm bore, double-acting, single-rod pneumatic cylinder with a unique rear-cap adjusting screw, allowing the effective stroke to be fine-tuned within a 20 mm range from the 1000 mm nominal maximum. This field-adjustable feature is invaluable for commissioning and format changes, eliminating the need for external hard stops. With a 16 mm diameter piston rod and PT1/4 ports, it delivers a push force of 628 N at 0.5 MPa and up to 1130 N at 0.9 MPa.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel for precise, non-contact end-of-stroke detection. The cylinder body length A(SCJ) is 185 mm plus the 1000 mm stroke, with a cushion length of 21 mm at each end to decelerate the piston smoothly. It operates on 40 µm filtered air from 0.15 to 1.0 MPa, across a standard temperature range of -20 to +70 °C.
Airtac SCJ40 Standard Cylinder SCJ40X1000-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X1000-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 1000 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 SCJ40X1000-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×1000 | 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 SCJ40X1000-20S Is Used
End-Stop Commissioning
Fine-tune the retract stroke of a long-stroke transfer arm during initial setup without machining hard stops, using the 20 mm rear screw adjustment to perfectly align with a pick-and-place nest.
Format Changeover
Quickly adjust the push stroke for a product diverter on a packaging line when switching between different box sizes, compensating for the new format without replacing the cylinder.
Wear Compensation
In a long-stroke clamping application, use the stroke adjuster to take up mechanical play or seal wear over time, maintaining consistent clamp force without reprogramming the machine.
Is the Airtac SCJ40 Standard Cylinder SCJ40X1000-20S the Right Cylinder?
Choose the SCJ40X1000-20S when a 1000 mm stroke is needed with the ability to dial in the exact end position on the machine. If more force is required, stepping up to the 50 mm bore provides 982 N of push force at the same 0.5 MPa pressure. For applications where the stroke is absolutely fixed and never needs adjustment, the standard SC40X1000 fixed-stroke cylinder is a simpler, slightly shorter alternative. This long 1000 mm stroke demands careful attention to side loading; ensure the load is guided externally or consider a guided cylinder to prevent rod bending and premature seal wear.
As a direct replacement, this unit matches an AirTAC SCJ adjustable-stroke cylinder with a 40 mm bore, 1000 mm nominal stroke, a 20 mm adjustment range, PT ports, and a built-in magnet. The basic mounting style accepts the standard SCJ accessory range (FA front flange, LB foot mount, or TC centre trunnion), but does not include a mounting bracket itself.
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 SCJ40X1000-20S FAQ
The theoretical push force at 0.5 MPa is 628 N, and the pull force on the return stroke is 528 N due to the 16 mm rod reducing the piston area. At the maximum operating pressure of 1.0 MPa, the push force reaches 1256 N.
A rear-cap screw lets you shorten the stroke end by up to 20 mm from the 1000 mm nominal maximum. It is a direct dimensional replacement for a similarly configured SCJ40X1000-20S. It can replace a fixed-stroke SC40 cylinder only if the application can tolerate the slightly longer body length A(SCJ) and the stroke adjustment feature is needed.
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