The FESTO MS6-LR-1/2-D7-AS, Order Number 529993, is a compact industrial pressure regulator from the MS series, designed for reliable compressed-air control in automation systems, machine-building projects, and general pneumatic service assemblies. This model belongs to Size 6 of the MS platform and uses a G1/2 female-thread connection, which places it in a practical middle range for users who need a regulator with meaningful flow capacity without moving to a much larger air-preparation unit. FESTO’s official product data list a standard nominal flow rate of 5500 l/min, a pressure regulation range of 0.5 to 12 bar, an operating pressure of 0.8 to 20 bar, and an official product weight of 730 g.
This model is not a filter-regulator combination and not a lubricator. It is a dedicated pressure regulator whose primary task is to maintain a stable downstream pressure even when upstream pressure or downstream consumption changes. FESTO’s MS regulator documentation states that the regulator maintains a constant working pressure on the secondary side independently of pressure fluctuations on the primary side and air consumption, and describes the design as a directly actuated diaphragm regulator with input pressure compensation and minimal hysteresis. That makes the MS6-LR-1/2-D7-AS especially suitable for circuits where actuator performance depends on stable pressure rather than on simple unrestricted airflow alone.
Product Identity
For industrial procurement and technical documentation, it is important to keep the order number and the model clearly separated:
| Item | Specification |
|---|---|
| Brand | FESTO |
| Order Number | 529993 |
| Model | MS6-LR-1/2-D7-AS |
| Product Type | Pressure regulator |
| Series | MS |
| Size | 6 |
| Pneumatic Connection | G1/2 female thread |
| Pressure Regulation Range | 0.5 to 12 bar |
| Operating Pressure | 0.8 to 20 bar |
| Standard Nominal Flow Rate | 5500 l/min |
| Product Net Weight | 730 g |
All values in the table above are taken from FESTO’s official product page and current MS regulator documentation.
Configuration Meaning
The model code of this product is commercially useful because it tells the buyer what the regulator actually is. In FESTO’s current MS regulator documentation, MS identifies the series, 6 indicates Size 6 with a 62 mm grid dimension, LR identifies the function as pressure regulator, 1/2 indicates the G1/2 female-thread pneumatic connection, and D7 defines the 0.5 to 12 bar manually actuated pressure range. The AS suffix identifies the variant with a rotary knob with latch that can be locked using accessories. FESTO’s selected-products and ordering-data pages also place Part Number 529993 directly against Type MS6-LR-1/2-D7-AS, so the identification is straightforward and reliable for purchasing and replacement work.
From a user perspective, this coding matters because it reduces ambiguity. Many pneumatic regulators look similar at a glance, but connection size, pressure range, locking method, and regulator function can vary enough to make a wrong selection costly. The MS6-LR-1/2-D7-AS is not just “a pressure regulator”; it is a specific G1/2, 0.5 to 12 bar, Size 6 unit within the MS series. For maintenance teams and spare-parts suppliers, that level of precision is essential.
Technical Characteristics
The MS6-LR-1/2-D7-AS is built around a directly actuated diaphragm regulator concept. FESTO describes the regulator function as maintaining constant output pressure with input pressure compensation, return flow, and availability with or without secondary exhausting at the family level. For this specific variant, FESTO’s selected-products coding indicates the presence of secondary exhausting, which is valuable in practice because it allows downstream pressure to be reduced more effectively when the setpoint is lowered. That is particularly useful in pneumatic systems where quick pressure correction improves response consistency and reduces overshoot in downstream actuators.
The regulator is also part of a product family designed for high flow rate with minimal pressure drop and good control characteristics with minimal hysteresis. In the catalog, FESTO states a maximum pressure hysteresis of 0.25 bar for the MS4/MS6-LR family and highlights two pressure-gauge connections for different installation options. In commercial terms, this means the product is positioned not as a low-cost, minimal-function component, but as a serious industrial regulator intended to combine stable control with practical installation flexibility.
Pressure Stability and Airflow Performance
One of the strongest reasons to choose the MS6-LR-1/2-D7-AS is its balance between pressure-control quality and airflow capacity. FESTO lists the standard nominal flow rate at 5500 l/min, which is a substantial figure for a G1/2 regulator in this size class. That performance level makes the product suitable for supplying multiple downstream pneumatic consumers or for supporting machine sections where air demand is intermittent but still significant. At the same time, the 0.5 to 12 bar regulation range gives it enough flexibility to serve both lower-pressure actuator circuits and conventional industrial compressed-air applications.
Pressure stability is often more important than headline flow in real automation systems. Cylinders, grippers, valve islands, blow-off circuits, and clamp mechanisms all depend on predictable downstream pressure if they are expected to behave consistently. FESTO explicitly states that the MS-LR regulators maintain secondary pressure independently of primary-side fluctuations and air consumption, which is exactly the kind of functional behavior designers look for when they want repeatable machine performance rather than just a generic line component.
Installation and Integration
The MS6-LR-1/2-D7-AS is designed for straightforward integration into industrial compressed-air assemblies. FESTO lists with accessories, in-line installation, and front panel mounting among the mounting options for the MS4/MS6-LR family, and the mounting position is specified as any. That level of flexibility is useful in practical machine design because regulators are not always installed in generous open space. Sometimes they must fit inside a control cabinet, beside a valve terminal, or in a tight service-unit arrangement where orientation choices are limited.
The product also conforms to ISO 1179-1 and ISO 228-1 in the relevant connection context for the MS6-LR threaded versions, which is another useful integration detail for engineers working with standard pneumatic fittings and service-unit layouts. In addition, the regulator family includes two pressure-gauge connections for different installation options, giving designers more flexibility in making the pressure display accessible and readable once the unit is mounted in the machine.
Materials, Construction, and Weight
While the most visible values in a regulator specification are usually pressure range and flow, the physical construction is just as important in real service. The MS series is designed as an industrial service-unit platform rather than as a light-duty workshop accessory, and the 730 g official product weight supports that positioning. This is not an oversized component, but it is solid enough to indicate a proper industrial build rather than an ultra-light economy design. For export sales, spare-parts packing, and machine documentation, having the official weight is also commercially useful because it improves freight estimation and bill-of-material accuracy.
The regulator is also covered by FESTO’s current reliability documentation. The official reliability data sheet for Part Number 529993 lists a B10 service-life value of 20 million cycles, identifies the product as a well-tried component for safety-related applications in the ISO 13849 context, and references vibration and shock testing according to FESTO’s internal standards aligned with EN 60068 methods. That does not mean the regulator should be treated as a universal safety device by default, but it does show that the component comes from a mature and thoroughly characterized industrial platform.
Application Value
Based on FESTO’s published specifications, the MS6-LR-1/2-D7-AS is well suited to a broad range of pneumatic duties in machine building, packaging systems, assembly automation, general factory service units, and modular air-preparation stations. This is an engineering inference from the product’s combination of G1/2 connection, 5500 l/min flow capacity, 0.5 to 12 bar regulation range, and industrial mounting flexibility rather than a narrow marketing claim from a single brochure.
| Application Area | Why the MS6-LR-1/2-D7-AS Fits |
|---|---|
| Machine Building | Stable regulated air for medium-demand pneumatic circuits |
| Packaging Equipment | Consistent downstream pressure for repeatable cycles |
| Assembly Automation | Good balance of flow capacity and compact regulator size |
| Central Air Preparation Modules | Easy integration into MS-series service-unit layouts |
| Maintenance and Replacement | Clear ordering code and official documentation simplify sourcing |
The table above is a practical application interpretation based on FESTO’s official technical data for this model and the MS regulator family.
Why This Model Is Commercially Useful
From a buyer’s perspective, this model is attractive because it solves a common industrial requirement without unnecessary complication. It provides a meaningful pressure-control range, strong airflow performance, accessory-lockable adjustment, and an established MS-series platform. That combination makes it easier to standardize across multiple machines or to keep as a stock item for replacement demand. In many factories, the best regulator is not the most specialized one, but the one that performs consistently, fits standard pipework, and is easy to identify by exact order code. The MS6-LR-1/2-D7-AS fits that pattern well.
It also benefits from being part of FESTO’s broader MS service-unit ecosystem. That reduces uncertainty for users who want a regulator that can live inside a more complete compressed-air preparation assembly rather than as a standalone improvised component. For system integrators, that kind of platform compatibility is often worth as much as the regulator’s headline technical values.
Conclusion
The FESTO MS6-LR-1/2-D7-AS, Order Number 529993, is a well-defined industrial pressure regulator for compressed-air systems that require stable output pressure, solid flow performance, and practical integration into modern pneumatic assemblies. Its official specifications include a G1/2 connection, 0.5 to 12 bar pressure regulation range, 0.8 to 20 bar operating pressure, 5500 l/min standard nominal flow rate, Size 6 / 62 mm grid dimension, and an official product weight of 730 g. FESTO also documents the product family as a directly actuated diaphragm regulator with input pressure compensation, good regulation behavior, and flexible installation options.
For users who need a regulator that is technically clear, commercially practical, and suitable for real industrial service, the MS6-LR-1/2-D7-AS is a strong and sensible choice. It is not a decorative catalog item. It is a functional pneumatic control component built for everyday industrial use.
