AirTAC Pneumatics
AirTAC Lock Cylinders
AirTAC lock cylinders in 32-125mm bores: the BSAI clamp-lock holds at any mid-stroke position, while BSE and BSED spring-applied rod locks hold vertical loads even when air is lost.
inventory_2930 models availableSeries Overview
A lock cylinder is an ISO 15552 cylinder with a mechanical holding device built in. It does the one thing a plain pneumatic cylinder cannot: hold position without live air. An air cushion only decelerates the piston near the end of stroke, and a closed valve leaks eventually - neither will hold a suspended load. A mechanical lock will.
This family covers 930 published part numbers across three series, all spanning 32-125 mm bore and built on the ISO 15552 profile, so mounting interchanges with other ISO 15552 cylinders. BSAI uses a built-in bidirectional clamp-lock that grips the rod at any mid-stroke position, in either direction. BSE adds a rod-lock unit where the spring applies the lock and air releases it. BSED is the double-rod version of BSE with the same spring-applied lock.
The fail direction is the key specification: on BSE and BSED, the spring applies the lock, so losing air or hitting an E-stop results in a locked rod, not a dropped load. That makes them the fail-safe choice for vertical and suspended loads. BSAI holds wherever the rod happens to be, which suits stops that are not fixed. Position feedback is available through the piston-magnet option, specified at order time.
Browse Models
Airtac BSAI Locking Clamp Cylinder BSAI100X100
SKU: BSAI100X100
$472.68$480.18
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Airtac BSAI Locking Clamp Cylinder BSAI80X350S
SKU: BSAI80X350S
$393.38$400.88
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Airtac BSAI Locking Clamp Cylinder BSAI80X600
SKU: BSAI80X600
$424.76$432.26
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Airtac BSAI Locking Clamp Cylinder BSAI80X75S
SKU: BSAI80X75S
$354.04$361.54
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Airtac BSAI Locking Clamp Cylinder BSAI80X400S
SKU: BSAI80X400S
$400.56$408.06
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Airtac BSAI Locking Clamp Cylinder BSAI100X125S
SKU: BSAI100X125S
$482.92$490.42
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Airtac BSAI Locking Clamp Cylinder BSAI80X450
SKU: BSAI80X450
$402.22$409.72
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Airtac BSAI Locking Clamp Cylinder BSAI80X80S
SKU: BSAI80X80S
$357.55$365.05
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Airtac BSAI Locking Clamp Cylinder BSAI80X250
SKU: BSAI80X250
$373.58$381.08
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Airtac BSAI Locking Clamp Cylinder BSAI80X500
SKU: BSAI80X500
$409.41$416.91
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Airtac BSAI Locking Clamp Cylinder BSAI80X450S
SKU: BSAI80X450S
$407.80$415.30
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Airtac BSAI Locking Clamp Cylinder BSAI80X300
SKU: BSAI80X300
$380.56$388.06
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Airtac BSAI Locking Clamp Cylinder BSAI80X250S
SKU: BSAI80X250S
$379.16$386.66
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Airtac BSAI Locking Clamp Cylinder BSAI80X150
SKU: BSAI80X150
$359.16$366.66
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Airtac BSAI Locking Clamp Cylinder BSAI80X25S
SKU: BSAI80X25S
$347.99$355.49
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Airtac BSAI Locking Clamp Cylinder BSAI80X300S
SKU: BSAI80X300S
$386.14$393.64
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Airtac BSAI Locking Clamp Cylinder BSAI80X500S
SKU: BSAI80X500S
$414.99$422.49
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Airtac BSAI Locking Clamp Cylinder BSAI80X175S
SKU: BSAI80X175S
$368.46$375.96
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Airtac BSAI Locking Clamp Cylinder BSAI80X1000
SKU: BSAI80X1000
$487.10$494.60
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Airtac BSAI Locking Clamp Cylinder BSAI80X200
SKU: BSAI80X200
$366.39$373.89
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Airtac BSAI Locking Clamp Cylinder BSAI80X160S
SKU: BSAI80X160S
$368.46$375.96
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Typical Applications
Vertical lift stations with E-stop
A lifting column or vertical press ram in an assembly cell must not fall when the E-stop is hit or air pressure is lost. BSE's spring-applied, air-released rod lock makes the locked state the safe state, holding the suspended load with no live air.
Fixture clamping at variable positions
On a machining or welding fixture where the stop position changes between part types, BSAI's bidirectional clamp-lock grips the rod at any mid-stroke point in either direction, so one cylinder serves several setups without a fixed end-stop.
Anti-rotation tooling platens
A pick-and-place platen or rotary indexing tooling plate must not twist while held. BSED's double-rod design provides anti-rotation from the second rod, equal push and pull force, and the same fail-safe spring-applied holding as BSE.
Suspended gates and counterweighted loads
Counterweighted shutters, hopper gates and dock equipment in warehousing stay where they are put. A lock cylinder holds the stopped load mechanically instead of relying on a leaking valve, with holding figures confirmed from the datasheet for the specific part number.
How to Choose the Right Model
Start with where the load must hold. If it is vertical or suspended, or there is an E-stop or air-loss case where it must not drop, choose BSE or BSED - the spring-applied lock makes the safe state locked. If it must hold at an arbitrary mid-stroke point rather than one fixed stop, choose BSAI, whose bidirectional clamp-lock grips wherever the rod is. Then decide one rod or two: BSE is single-rod; BSED gives equal push and pull force plus anti-rotation from the second rod, so pick it when the tooling must not twist or the forces both ways must match. All three series cover the 32-125 mm bore range on the ISO 15552 profile. Confirm the five points before ordering: bore, stroke or spec, port and thread (confirmed per part number from the datasheet), mounting style, and the piston-magnet option if you need position feedback.
Step out of this family when holding is not the requirement. For a plain cylinder on the same ISO 15552 interface, see the AirTAC SAI / SE standard cylinders. For anti-rotation without a lock, see AirTAC double-rod cylinders. The solenoid valves that drive and release these cylinders are in the AirTAC valve range. Note that a lock cylinder holds a stopped load - it is not a brake for a moving load, so confirm the duty with us if the load is still moving when the lock engages.
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
All three series - BSAI, BSE and BSED - span 32-125 mm bore on the ISO 15552 profile. The family lists 930 published part numbers: 308 for BSAI, 313 for BSE and 309 for BSED. Holding force is specific to each part number and is confirmed from the datasheet rather than estimated from bore.
BSAI is a clamp-lock cylinder that holds at any mid-stroke position, in either direction - choose it when the stop position is not fixed. BSE is a single-rod cylinder with a spring-applied, air-released rod lock, built for vertical and suspended loads. BSED is the double-rod version of BSE: equal push and pull force plus anti-rotation from the second rod, with the same fail-safe spring-applied holding.
All three series are built on the ISO 15552 profile, so mounting interchanges with other ISO 15552 cylinders. If you also need position feedback, the piston-magnet option must be specified at order time - it cannot be added afterwards, so match bore, stroke, mounting and magnet option together. Port and thread details are confirmed per part number from the datasheet.
On BSE and BSED the spring applies the lock and air releases it, so losing air or hitting an E-stop results in a locked rod - the safe state is locked, and no air is needed to hold. All three series are current AirTAC products listed and orderable from us as genuine parts; lead time is confirmed on request for each part number.
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