Airtac BSLM Miniature Silencer BSLM04-S
SUS304 stainless variant (-S)The AirTAC Airtac BSLM Miniature Silencer BSLM04-S is a genuine mini silencer that cuts exhaust noise by 20 dB at 0.5 MPa using a copper-particle sintered element in a SUS304 body.
- TypeMini silencer
- SeriesBSLM
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure1.5 MPa
- Noise reduction20 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-S
Every stroke of a directional valve ends with a pressure pulse venting to atmosphere, and that pulse is what your ears register as the crack of escaping air. The BSLM04-S screws onto the 1/2in PT exhaust port and forces the discharge through a sintered element that breaks the pulse into countless small jets, cutting exhaust noise by 20 dB at 0.5 MPa.
This is the stainless build of AirTAC's mini silencer: the body is machined from SUS304, so the part keeps its strength and appearance through wash-down regimes, salt-laden air and chemical splash that would pit an aluminium body. The datasheet also lists it as suitable for copper-prohibited conditions, though the sound-absorbing element itself is a copper-particle sintered cover, so the corrosion case rests on the SUS304 body. Being the M-series, it delivers the same element in a body shorter than the full BSL, which helps where the exhaust port sits close to a guard panel or manifold wall.
Airtac BSLM Miniature Silencer BSLM04-S Technical Specifications
| Model | Airtac BSLM Miniature Silencer BSLM04-S |
|---|---|
| Type | Mini silencer |
| Series | BSLM |
| Noise reduction | 20 dB at 0.5 MPa |
| Element | Copper-particle sintered element in a sus304 body |
| Body material | Stainless steel 304 (-S variant) |
| 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. Stainless (-S): SUS304 silencer body. The sound-absorbing element remains copper-particle sintered, so this variant is specified for corrosion resistance rather than as a wholly copper-free 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-S
| 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. |
| -S | Stainless-steel body. |
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-S Is Used
Food plant wash-down zone
On a bottling line caustic foam is hosed over the machine every shift, so the 1/2in exhaust of the valve bank needs a silencer whose SUS304 body will not corrode or flake into the production area. The 20 dB cut keeps conversation possible beside the pack table.
Marine deck pneumatics
Hatch-cover and winch controls on a ship's deck see salt spray and humidity daily. A stainless mini silencer on the 1/2in PT exhaust resists the rust that quickly seizes an aluminium unit, with no repaint schedule to maintain.
Copper-prohibited process areas
In plating shops and electronics wet-process lines where copper-bearing parts are kept away from the bath, the stainless BSLM04-S is the catalogue-listed choice for copper-prohibited conditions, provided the sintered element's location in the exhaust path is acceptable to the process owner.
Is the Airtac BSLM Miniature Silencer BSLM04-S the Right Part?
Step down to BSLM03-S if the valve exhaust is 3/8in PT - the silencing effect stays at 20 dB but the smaller orifice suits the smaller port. BSLM04-S is the top of the mini ladder; there is no larger BSLM thread, so for more body mass around a 1/2in port move to the full-size BSL04-S. Keep to metal here rather than the resin PAL range where the part can be knocked by trolleys or run hot and grimy: the sintered element survives abuse that would crush a polyethylene filter. Whatever you choose, match the valve's exhaust port rather than stepping down and hoping - a choked silencer throttles the exhaust, slows cylinder return strokes and builds back-pressure the valve was never sized for.
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-S FAQ
Thread 1/2in PT (code 04), the largest size in the BSLM mini series. 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. Silencing effect 20 dB at 0.5 MPa, the figure published for SUS304 stainless BSLM units on threaded ports above M5. Body SUS304; element copper-particle sintered.
No - and the datasheet is explicit about it. The body and adjusting hardware are SUS304, which is what gives the corrosion resistance you are buying. The sound-absorbing cover is listed as copper-particle sintered, the same element type used in the standard brass version. So specify this part for its stainless body and rust resistance; do not treat the whole assembly as a copper-free component. For genuinely all-resin, metal-free silencing, look at the PAL or PPA ranges instead.
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