Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 210mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke210 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-75
The AirTAC SAIJ40X210-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 75 mm. This creates a highly versatile 135-210 mm usable stroke window, enabling precise end-position tuning at commissioning without swapping out the cylinder or bolting on external stops. Delivering 628 N of push force at 0.5 MPa, it handles robust actuation tasks with ease.
This specific SKU is configured with a SUS304 stainless steel rod (code B) for superior corrosion resistance and includes PT tapered port threads. The extruded aluminum barrel incorporates sensor grooves on both sides for direct mounting of position detectors. While the rear adjuster and dual air cushions safely decelerate the load at the travel ends, neither acts as a lock, so the cylinder will not hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 210 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| 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, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / 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 | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×210 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-75 Is Used
Product Changeover
Dial in the 135-210 mm travel window during product size transitions on a packaging line, using the rear stopper to set new end positions rapidly.
Commissioning Fine-Tune
Trim up to 75 mm of stroke during machine setup to perfect the tooling contact point without machining spacers or installing external stop blocks.
Variable End Stops
Adjust the retract position on the fly for sorting or diverting operations where the physical stop location must adapt to different package depths.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-75 the Right Cylinder?
Choose this 40 mm bore model when an application requires a 628 N push force at 0.5 MPa and significant on-the-fly stroke flexibility. If your setup demands less force, stepping down to a 32 mm bore yields 402 N, whereas moving up to a 50 mm bore provides 982 N. The 75 mm adjustment range is particularly valuable for machines processing varying product sizes, allowing the end-stop to be dialed in during changeovers rather than re-engineering the entire motion assembly.
For an exact ISO 15552 replacement, match the 40 mm bore, 210 mm nominal stroke, 75 mm adjustment, PT port threads, and SUS304 (B) rod material. Note that this cylinder lacks a magnet for sensors. Because the nominal stroke is 210 mm, the 16 mm rod and M12x1.25 thread can handle moderate side loads, but if your application approaches the maximum standard stroke limit of 1200 mm, an external guide is recommended to prevent rod wear. Remember that for any load-holding requirements without continuous air pressure, a plain SAIJ is insufficient, and you should explore an AirTAC SAIL or BSAI series cylinder instead.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-75 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It operates on filtered air between 0.15 and 1.0 MPa, runs at speeds of 30-800 mm/s, and features a 16 mm SUS304 stainless steel rod with an M12x1.25 thread.
The rear adjusting screw acts as a mechanical stop that can shorten the 210 mm nominal stroke by up to 75 mm, giving an effective travel window of 135-210 mm. This allows you to fine-tune the retract end position during commissioning, but it is a travel stop, not a lock, and will not hold the load without live air pressure.
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