Airtac BSLM Miniature Silencer BSLM04
The AirTAC Airtac BSLM Miniature Silencer BSLM04 is a genuine mini silencer that cuts exhaust noise by 13 dB at 0.5 MPa using a sintered brass sound-absorbing element in an aluminium-alloy body.
- TypeMini silencer
- SeriesBSLM
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure1.5 MPa
- Noise reduction13 dB
- Temperature-20 to +70 °C
- 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 BSLM Miniature Silencer BSLM04
A silencer sits on the exhaust port of a directional valve and breaks up the pressure pulse that escapes as a sharp crack every time the valve shifts. The BSLM04 does this with a brass-particle sintered sound-absorbing cover on an aluminium-alloy body, rated at 13 dB of noise reduction measured at 0.5 MPa. The thread is 1/2in PT, the largest size offered in the BSLM mini ladder.
The distinguishing point of the BSLM series is body length: it carries the same sintered element as the full-length BSL but in a shorter housing, so a 1/2in port can be silenced where a standard body would foul guards, manifolds or adjacent fittings. The part also tolerates vacuum down to -750 mmHg (10 Torr), which matters on circuits where the exhaust side can see suction rather than pressure.
Airtac BSLM Miniature Silencer BSLM04 Technical Specifications
| Model | Airtac BSLM Miniature Silencer BSLM04 |
|---|---|
| Type | Mini silencer |
| Series | BSLM |
| Noise reduction | 13 dB at 0.5 MPa |
| Element | Sintered brass sound-absorbing element in an aluminium-alloy body |
| Working pressure | 0 - 1.0 MPa (0 - 10 kgf/cm2) |
|---|---|
| Negative pressure | -750 mmHg (10 Torr) |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Thread standard | PT (Rc tapered) unless the code says otherwise |
POM release button and chuck, aluminium-alloy guide, stainless spring gasket, NBR O-ring; body brass or PBT depending on the part. AirTAC publishes flow as a characteristic curve rather than a single figure, so no L/min value is listed.
Model Code: Airtac BSLM Miniature Silencer BSLM04
| BSLM | Mini silencer. |
|---|---|
| 01 / 02 / 03 / 04 | Thread: 1/8", 1/4", 3/8", 1/2". M5 where the series offers it. |
| D | Black. Blank = grey. |
Choosing a Silencer
- check Sintered-brass types (BSL / BSLM / BESL) give 13 dB and take rough treatment.
- check Resin types (PAL / PALM / PPA) give 25 dB and weigh far less.
- check PPA plugs straight into a tube instead of a thread, and is copper-free for sensitive processes.
- check BESL adds an adjustable throttle, so it silences AND sets exhaust speed in one part.
- check An undersized or clogged silencer shows up as a slow return stroke - size it to the valve's exhaust port.
Where the Airtac BSLM Miniature Silencer BSLM04 Is Used
Palletiser valve bank at 1/2in ports
Large palletising and case-packing valves often use 1/2in exhaust ports right at the operator walkway. A BSLM04 on each exhaust cuts the shift-long crack of cycling without the body length of a full-size silencer.
Injection moulding machine clamp circuit
Clamp and ejector cylinders on moulding machines dump big volumes of air on every cycle. The 1/2in PT thread of the BSLM04 matches the large valve exhausts while the short brass-sintered body clears tight manifold spacing.
Woodworking gate and clamp cylinders
Saw gates and hold-down clamps on panel saws cycle hundreds of times a day near the operator's ear. A sintered brass silencer stands up to sawdust-laden shop air that would blind a resin element sooner.
Is the Airtac BSLM Miniature Silencer BSLM04 the Right Part?
Sintered brass at 13 dB is the tough choice: pick it where the silencer will be knocked by trolleys, splashed with coolant or run near hot surfaces. Resin PAL-type silencers reach 25 dB but cannot take that abuse, so metal wins on dirty, mechanical machine frames even though it is the quieter-on-paper option loses. If you need silencing and exhaust-speed adjustment together, step up to the BESL throttling series instead.
Within BSLM the ladder runs M5, 01 (1/8in), 02 (1/4in), 03 (3/8in) and 04 (1/2in). BSLM04 is the top of that ladder, so the only step down is BSLM03 at 3/8in, which suits smaller valve exhaust ports but leaves the 1/2in port partly open to noise. Do not size down to a neat-looking part: match the silencer thread to the valve's exhaust port, because an undersized silencer restricts exhaust and drags out the cylinder return stroke.
Quick checklist
- ✓ Tube outside diameter matches exactly
- ✓ Thread size and standard match the port
- ✓ Working pressure within 0 - 1.0 MPa (0 - 10 kgf/cm2)
- ✓ Temperature within -20 to +70 °C
- ✓ Noise target: 13 dB metal or 25 dB resin
Airtac BSLM Miniature Silencer BSLM04 FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. The thread is 1/2in PT and the series noise reduction is 13 dB at 0.5 MPa via a brass-particle sintered element in an aluminium-alloy body.
It should not, provided the 1/2in thread matches the valve's exhaust port. Exhaust flow through a silencer is published as a characteristic curve rather than a fixed number, and the practical rule is to size to the port rather than down. A silencer that is too small, or a sintered element that has gradually clogged with dirt, restricts exhaust and lengthens the return stroke - so replace the silencer if cycle speed starts to drift.
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