This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X50-40S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAU replacement uses the same profile body, bore, stroke, force and SC-series mounting. It moves to the current CMSG / DMSG / EMSG sensor switches (the SU used CS1-B / DS1-B) and adds the SAUF valve-integrated option.
Airtac SUJ Adjustable Cylinder SUJ40X50-40S
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X50-40S is a double-acting profile-type standard cylinder with a Ø40mm bore and 50mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X50-40S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke50 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X50-40S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SUJ Adjustable Cylinder SUJ40X50-40S
The AirTAC SUJ40X50-40S is a double-acting double-rod profile cylinder with an external stop screw that lets you trim the extend stroke by up to 40 mm on-site, giving a usable 10-50 mm extend window from the 50 mm nominal maximum. This compact extruded-aluminum barrel is shorter than an ISO 15552 cylinder of the same bore.
This SUJ40X50-40S (with a built-in piston magnet for legacy CS1-B/DS1-B switches) is discontinued; the direct replacement is the SAUJ40X50-40S, sharing the same bore, stroke, force, 1/4" port, and FA/LB mounting. The SAUJ upgrades to current CMSG/DMSG/EMSG sensors and offers the SAUF built-in-valve variant the SU line lacked.
Airtac SUJ Adjustable Cylinder SUJ40X50-40S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X50-40S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X50-40S |
| Bore size | Ø40 mm |
| Stroke | 50 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| 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 standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SU datasheet (now discontinued). The SAUJ40X50-40S carries the same ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
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 | |
The SAUJ40X50-40S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SUJ Adjustable Cylinder SUJ40X50-40S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SU-family variants: SUD (double rod), SUJ (adjustable stroke) — each maps to its SAU equivalent (SUD→SAUD, SUJ→SAUJ). The current SAU line adds the SAUF valve-integrated option.
Where the Airtac SUJ Adjustable Cylinder SUJ40X50-40S Is Used
Variable Stroke Clamping
Allows operators to dial in the exact extend distance for clamping parts of varying widths without swapping out the entire cylinder.
Adjustable Ejector Pins
Provides on-site stroke trimming for ejection mechanisms where the push distance must be fine-tuned to avoid damaging delicate components.
Sorting Diverter Positioning
Enables field adjustment of the diverter stroke to accommodate different product sizes on a packaging or sorting line.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X50-40S with the SAUJ40X50-40S
To replace the discontinued SUJ40X50-40S, specify the direct replacement SAUJ40X50-40S, which matches the 40 mm bore, 50 mm nominal stroke, 40 mm adjust window, 1/4" port, and FA/LB mounting. Choose the 40 mm adjust window when you need precise field tuning of the extend stroke from 10 to 50 mm; the external stop screw sets the end position but is not a load lock. Because this model has the -S suffix, upgrade your position sensing from legacy CS1-B/DS1-B switches to current CMSG/DMSG/EMSG sensors. A plain cylinder drifts on air loss and the cushion only decelerates near stroke end, so specify an external rod lock or pilot-operated check valve for held loads. For strokes of 300 mm or longer, verify side-load limits to prevent guide wear.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X50-40S
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S): sensor family CS1-B → CMSG
- ✓ Mounting reused (FA/FB/CA/CB/LB)
- ✓ Need a built-in valve? → SAUF
Airtac SUJ Adjustable Cylinder SUJ40X50-40S FAQ
Yes, the SUJ40X50-40S is discontinued. The direct replacement is the SAUJ40X50-40S, which shares the same 40 mm bore, 50 mm stroke, 40 mm adjust window, 1/4" port, and FA/LB mounting. You will need to upgrade your position sensing from legacy CS1-B/DS1-B switches to the current CMSG/DMSG/EMSG sensors.
The external stop screw allows you to trim the extend stroke by up to 40 mm on-site, creating a usable 10-50 mm extend window from the 50 mm nominal maximum. The stop sets the end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X50-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X50-40S replacement — usually within 7-8 hours.