The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X170-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø40mm bore, 170mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X170-40S is a double-acting, single-rod pneumatic cylinder from AirTAC's SCJ series, designed for applications where the stroke end position must be field-tuned without replacing the unit. Its rear-cap adjusting screw provides a 40 mm adjustment range, allowing operators to fine-tune the 170 mm nominal stroke for commissioning, format changeovers, or taking up mechanical wear. The built-in magnet enables direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
With a 40 mm bore and 16 mm piston rod, this cylinder delivers 628 N of push force and 528 N of pull force at 0.5 MPa. It features a PT1/4 port, M12x1.25 rod thread, and a 21 mm pneumatic cushion to decelerate the piston smoothly at stroke end. The body length A(SCJ) is 185 mm, and the operating speed range is 30-800 mm/s, making it a versatile workhorse for medium-duty automation tasks.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X170-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 170 mm |
| Stroke adjustment | Up to 40 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. |
| ×170 | Nominal (maximum) stroke length in mm. |
| -40 | 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.
During initial machine setup, the 40 mm adjustment screw allows engineers to precisely dial in the optimal stroke end position for a pusher or stop without needing to swap out the cylinder or machine custom spacers.
In automated clamping fixtures, the adjustable stroke can be periodically extended to compensate for wear on contact pads, maintaining consistent clamping force without reprogramming a servo axis.
For packaging lines that handle different product sizes, the stroke can be quickly adjusted to change the travel of a diverter gate, enabling a rapid mechanical changeover between production runs.
Select the SCJ40X170-40S when you need a mid-range force output with the flexibility of a 40 mm stroke-end adjustment. If your load requires more force, step up to the SCJ50 bore, which provides 982 N of push force at 0.5 MPa. For a lighter, more compact solution, the SCJ32 bore offers 402 N of push force. If your application does not require stroke adjustability, a fixed-stroke SC cylinder of the same bore and stroke is a simpler, cost-effective alternative.
This cylinder is a direct dimensional replacement for another AirTAC SCJ40 with a 170 mm nominal stroke and 40 mm adjustment range, equipped with a magnet, PT ports, and basic mounting. For a nominal stroke of 170 mm, rod buckling is not a primary concern under axial loads, but ensure the load is guided if significant side forces are present to prevent premature seal and bearing wear.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder provides a push force of 628 N and a pull force of 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. The theoretical maximum at 1.0 MPa is 128 kgf.
A rear-cap screw mechanically limits the piston's stroke end by up to 40 mm, shortening the 170 mm nominal stroke. It is a direct replacement for any AirTAC SCJ40X170-40S cylinder with a magnet and PT ports. It is not a drop-in replacement for fixed-stroke SC cylinders or units from other manufacturers without verifying the tie-rod dimensions and mounting.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.