This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X400-50S, 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 SUJ40X400-50S
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X400-50S is a double-acting profile-type standard cylinder with a Ø40mm bore and 400mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X400-50S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke400 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X400-50S
- 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 SUJ40X400-50S
The AirTAC SUJ40X400-50S is a double-acting double-rod profile cylinder with a 40 mm bore and 400 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable range of 350-400 mm. The stop sets the end position but is not a load lock. The 1/4" port and M12x1.25 rod end match standard requirements.
This SUJ40X400-50S model is discontinued; the direct replacement is the SAUJ40X400-50S, retaining the same force, 50 mm adjust window, and FA/LB mounting. The SAUJ upgrades to current CMSG/DMSG/EMSG sensors, whereas this legacy unit uses CS1-B/DS1-B switches. Note that plain cylinders drift on air loss; use an external rod lock for held loads.
Airtac SUJ Adjustable Cylinder SUJ40X400-50S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X400-50S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X400-50S |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAUJ40X400-50S 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 SAUJ40X400-50S 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 SUJ40X400-50S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SUJ40X400-50S Is Used
Variable-Length Clamping
Adjusting the extend stroke on-site by up to 50 mm allows a clamping fixture to accommodate varying part lengths without swapping the entire cylinder.
Variable Stop Positioning
Trimming the extend stroke lets operators set multiple precise stop points along a conveyor lane for different package sizes using a single actuator.
Adjustable Pusher Travel
Tuning the extend stroke on the fly enables a sorting pusher to handle varied box depths without requiring mechanical spacers or manual rod changes.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X400-50S with the SAUJ40X400-50S
To replace the discontinued SUJ40X400-50S, order the direct replacement SAUJ40X400-50S, which matches the 40 mm bore, 400 mm stroke, 50 mm adjust window, 1/4" port, and FA/LB mounting. Choose the 50 mm adjust window if your extend stroke needs on-site tuning between 350 and 400 mm. Because the -S suffix denotes a piston magnet, upgrade your legacy CS1-B/DS1-B switches to current CMSG/DMSG/EMSG sensors. For this 400 mm stroke, use external guides to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X400-50S
- ✓ 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 SUJ40X400-50S FAQ
Yes, the SUJ40X400-50S is discontinued. The direct replacement is the SAUJ40X400-50S, which shares the same 40 mm bore, 400 mm stroke, 50 mm adjust window, 1/4" port, and FA/LB mounting. You must upgrade the position sensing from legacy CS1-B/DS1-B switches to the current CMSG/DMSG/EMSG sensors.
The external stop screw provides a 50 mm adjust window, allowing you to shorten the 400 mm extend stroke down to 350 mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X400-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X400-50S replacement — usually within 7-8 hours.