This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X300-40, 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 SUJ40X300-40
The AirTAC Airtac SUJ Adjustable Cylinder SUJ40X300-40 is a double-acting profile-type standard cylinder with a Ø40mm bore and 300mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X300-40, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke300 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X300-40
- 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 SUJ40X300-40
The AirTAC SUJ40X300-40 is a discontinued double-acting double-rod adjustable-stroke profile cylinder. An external stop screw lets you trim the extend stroke by up to 40 mm on-site, yielding a usable 260-300 mm stroke from the 300 mm nominal maximum. The extruded aluminum profile barrel is shorter than a standard cylinder of the same bore.
As this SUJ model is end-of-life, the direct replacement is the SAUJ40X300-40, retaining the same bore, stroke, force, port, and FA/LB mounting. The SAUJ upgrade shifts to current CMSG/DMSG/EMSG sensors, whereas this legacy unit used CS1-B/DS1-B switches. Note this specific SKU has no magnet and cannot take a switch.
Airtac SUJ Adjustable Cylinder SUJ40X300-40 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X300-40 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X300-40 |
| Bore size | Ø40 mm |
| Stroke | 300 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 SAUJ40X300-40 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 SAUJ40X300-40 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 SUJ40X300-40
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 SUJ40X300-40 Is Used
Variable Depth Boring
Adjusts the extend stroke on-site to hit precise material depths during multi-stage machining without swapping the entire cylinder.
Variable Length Diverter
Tunes the extend stop to deflect different package sizes on a conveyor line, accommodating changing product dimensions on the fly.
Adjustable Pusher Arm
Trims the extend stroke to push varying pallet depths into storage racks, allowing flexible positioning within a 40 mm window.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X300-40 with the SAUJ40X300-40
To replace the discontinued SUJ40X300-40, select the direct replacement SAUJ40X300-40, which matches the 40 mm bore, 300 mm stroke, 1/4" port, and FA/LB mounting. The 40 mm adjust window is ideal if your extend end-position needs on-site tuning between 260 and 300 mm. Because this SKU lacks a magnet, you cannot mount sensors; the SAUJ upgrade uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B. At the 300 mm stroke length, use external guides to prevent rod bending and side-load damage. The external stop screw sets the end position but is not a load lock; for held loads, add an external rod lock or pilot-operated check valve.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X300-40
- ✓ 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 SUJ40X300-40 FAQ
Yes, the SUJ40X300-40 is discontinued. The SAUJ also offers the SAUF built-in-valve variant the SU line lacked.
The external stop screw allows you to trim the extend stroke by up to 40 mm on-site, giving a usable 260-300 mm stroke from the 300 mm nominal maximum. The stop sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X300-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X300-40 replacement — usually within 7-8 hours.