AirTAC Pneumatics
AirTAC SI Series ISO Cylinders
The AirTAC SI series is a discontinued ISO 15552 profile-barrel air cylinder spanning 32-200mm bores, replaced by the drop-in SAI series for existing fixtures.
inventory_27604 models availableSeries Overview
The AirTAC SI series is a discontinued ISO 15552 (original ISO 6431) standard pneumatic cylinder with an extruded aluminum profile barrel and no external tie rods. It spans 9 bores from 32 to 200mm, generating a push force at 0.5 MPa from 402 N up to 15708 N. The range operates double-acting at 0.15-1.0 MPa using 40um filtered air, with adjustable air cushions at both ends and a standard sensor groove.
The series includes variants like the SID double-rod and SIJ adjustable-stroke cylinders. Ports range from G1/8 on the 32mm bore to G3/4 on the 200mm bore, with available PT, G, and NPT threads. Speeds reach 30-800 mm/s for 32-100mm bores and 30-500 mm/s for 125-200mm bores.
AirTAC replaced the SI with the SAI series, a true drop-in upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, and port sizes. The SAI improves longevity with a two Y-shaped one-way piston seal. Buyers searching for legacy SI models should order the SAI equivalent by inserting an A after the leading S (SI becomes SAI, SID becomes SAID).
Browse Models
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI32X100
SKU: B04-SI32X100
$56.52$64.02
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Airtac SI32 Standard Air Cylinder SI32BX750STC
SKU: SI32BX750STC
$145.13$152.63
schedule Confirm lead time
Typical Applications
Automated Assembly Lines
Drives linear motions in ISO 15552 fixtures where the 32-100mm bores provide 402-4900 N of push force at 0.5 MPa for part placement and tooling actuation.
Material Handling Diverters
Uses the 80-125mm bore range to push heavy loads across belts, relying on the adjustable air cushions to decelerate the piston smoothly at stroke end.
Packaging Machinery
Handles carton erecting and sealing where the 40-63mm bore sizes offer a balance of speed (up to 800 mm/s) and compact profile-barrel integration.
Heavy Lifting Jigs
Lifts substantial payloads using the 160-200mm bores, delivering up to 15708 N push force at 0.5 MPa for vertical material elevation in fixed tooling.
How to Choose the Right Model
Select within the SI range by matching the bore to your force requirement: the 32mm bore yields 402 N push at 0.5 MPa, while the 200mm bore yields 15708 N. Choose SID for double-rod anti-rotation needs or SIJ for adjustable stroke limits. Confirm these 5 points before ordering: bore size, stroke, port thread (PT/G/NPT), mounting bracket, and magnet option.
Because the SI is discontinued, step out of the legacy series to the current SAI family for all new builds and direct replacements. For applications requiring load holding or self-valve control, step further into SAIL (air-released lock), SAIF (built-in 4M valve for 32-100mm bores), or BSAI (clamp-lock) variants, which the original SI series lacked.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and available mounting space
- ✓ Port / thread type (PT / NPT / G)
- ✓ Sensor / magnet option (-S)?
- ✓ Side load — consider a guided model
Frequently Asked Questions
No, the SI series is discontinued. AirTAC replaced it with the SAI series, a drop-in ISO 15552 replacement sharing the same mounting interface, bore, stroke, output force, and accessories. Order the SAI equivalent by adding an A after the leading S (SI becomes SAI, SID becomes SAID).
At 0.5 MPa, push force spans 402 N for the 32mm bore to 15708 N for the 200mm bore. Theoretical maximum force at 1.0 MPa spans 82 kgf to 3204 kgf. Speed is 30-800 mm/s for 32-100mm bores and 30-500 mm/s for 125-200mm bores.
The standard SI is a single-rod double-acting cylinder. Variants include the SID for double-rod applications and the SIJ for adjustable stroke requirements. These map directly to the current SAID and SAIJ replacements.
No. The SI is double-acting and its adjustable air cushions only decelerate the piston near stroke end; they do not lock or hold the load. If load holding is required, a mechanical lock, rod brake, or pilot check valve is needed. The current SAIL variant offers an air-released lock for this purpose.
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