The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X180-30S 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, 180mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X180-30S is a double-acting, single-rod pneumatic cylinder from AirTAC's adjustable-stroke family, giving you a 30 mm field-adjustable range on the 180 mm nominal stroke. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa (1130 N at 0.9 MPa), making it a capable mid-range actuator for tasks that need fine end-position tuning.
A rear-cap adjusting screw lets you dial in the exact stroke end without swapping the cylinder or adding external hard stops—ideal for commissioning trials, format changeovers, or taking up mechanical wear over time. This model includes a built-in magnet (S) so CMSG/DMSG/EMSG reed or solid-state sensors can clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing. The body length A(SCJ) is 185 mm, and the standard PT1/4 port keeps plumbing straightforward.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X180-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 180 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.
| 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×180 | 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.
The 30 mm rear adjustment screw lets technicians fine-tune the retract stroke end during machine commissioning, eliminating the need to shim or reposition the cylinder body.
On packaging or labeling lines, operators can quickly dial in a new stroke length for different product sizes without mechanical disassembly, reducing downtime between batches.
In clamping or pressing fixtures, the adjustable stroke can be extended slightly over time to compensate for pad or tooling wear, maintaining consistent contact force without replacing the actuator.
Step up to the 50 mm bore SCJ if your application needs more force—the SCJ50 delivers 982 N push at 0.5 MPa. If you do not require stroke adjustability, the fixed-stroke SC40 series offers the same mounting and force characteristics in a slightly shorter package. For a direct replacement, match the 40 mm bore, 180 mm nominal stroke, -30 adjust range, PT thread, basic mounting, and the -S magnet option.
At a 180 mm stroke, rod deflection under side load is generally manageable, but if the cylinder is mounted horizontally with an offset load, consider an external guide rail or switch to a guided cylinder to protect the rod bearing and seal from premature wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 1.0 MPa, theoretical push force reaches 1280 N. Because it is a single-rod cylinder, push force is always greater than pull force.
Yes, if you need the 30 mm adjustable stroke feature. The SCJ40X180-30S shares the same 40 mm bore, 16 mm rod, PT1/4 port, and basic mounting pattern as an SC40. Just ensure the slightly longer body length (185 mm A dimension) fits your space, and match the -S magnet option if your existing setup uses sensors.
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