FULL-SIZE FULL-SIZE

Actual product may differ from above image. Product details should be verified before purchase.

Product Overview

The ROSS Controls provides panel mounting brackets and panel nuts for ROSS Full-Size and MD4 Series filter/regulator/lubricator units. These mounting accessories enable Full-Size and MD4 FRL regulators and integrated filter/regulators to be installed through a panel surface, placing the regulator adjustment interface on the front of the panel while keeping supply connections and downstream piping behind it.

The Series offers three configurations: the 879K77 complete kit (bracket and panel nut), the 878K77 bracket only, and the 880K77 panel nut only. This provides exact hardware procurement for new installations and targeted replacement of damaged components during service.

Full-Size and MD4 Series FRL units provide the highest flow capacities in the ROSS modular FRL range: Full-Size units deliver up to 180 scfm and MD4 Series units deliver up to 230 scfm at port sizes of 3/8, 1/2, and 3/4 inches. Panel mounting these large-capacity units with the series bracket system brings consistent air preparation hardware installation standards across the entire ROSS FRL product range.

The Series bracket attaches to the regulator or filter/regulator unit body and positions the assembly through a 1.56-inch (40 mm) diameter panel hole - the same panel hole diameter used by the Mid-Size Series 167 Series bracket, enabling interchangeable panel hole layouts across Mid-Size, Full-Size, and MD4 FRL panel installations.

Key Engineering Features

High Capacity FRL Panel Mounting - Provides secure panel mounting for Full-Size (up to 180 scfm) and MD4 (up to 230 scfm) Series FRL units at 3/8, 1/2, and 3/4 inch port sizes, the highest flow range in the ROSS FRL product line.
Three Ordering Options - Complete kit 879K77 (bracket + panel nut), bracket only 878K77, or panel nut only 880K77 allows precise hardware procurement for new installations and component-level service replacement.
Same Panel Hole as Mid-Size Bracket - Requires a 1.56-inch (40 mm) panel hole - the same diameter as the 167 Series Mid-Size bracket - enabling standardized panel layout drawings to cover both Mid-Size and Full-Size/MD4 FRL panel installations.
Compatible with Full-Size and MD4 Series Units - Designed for the complete range of ROSS Full-Size Series filters, regulators, lubricators, and integrated filter/regulators, as well as MD4 Series modular units.
Front-Panel Operator Access - Places the regulator adjustment knob and pressure gauge (where included) on the front face of the panel for accessible pressure monitoring and set point adjustment without opening the enclosure.
Two-Part Clamping System - Bracket and panel nut sandwich the panel material, providing vibration-resistant mounting that maintains stable FRL positioning under industrial machine operating conditions.

Technical Specifications

General Specifications

Parameter	Specification
Series	162 - Full-Size and MD4 Bracket Kit
Kit Model Number	879K77 (bracket and panel nut)
Bracket Only Model	878K77
Panel Nut Only Model	880K77
Panel Mounting Hole Required	1.56 inches (40 mm) diameter
Compatible Units	ROSS Full-Size Series filters, regulators, lubricators, integrated filter/regulators (3/8, 1/2, 3/4 port sizes); MD4 Series modular units
Compatible Flow Range	Full-Size: up to 180 scfm; MD4: up to 230 scfm
Contents (879K77 Kit)	One bracket (878K77) and one panel nut (880K77)
Dimension D	1.20 inches (31 mm)

Temperature Ratings

The Series bracket hardware is compatible with all standard Full-Size and MD4 Series FRL assemblies within their rated operating temperature ranges.

Configuration	Ambient Temperature	Media Temperature
Full-Size / MD4 Polycarbonate Bowl (standard)	40 to 125F (4 to 52C)	40 to 125F (4 to 52C)
Full-Size / MD4 Metal Bowl (optional)	40 to 125F (4 to 52C)	40 to 175F (4 to 80C)

Important: Temperature ratings are governed by the Full-Size or MD4 Series FRL units being mounted. Always verify the FRL unit temperature rating for the target application.

Certifications & Compliance

Certification/Standard	Detail
Platform Compliance	Designed for ROSS Full-Size and MD4 Series FRL units. When used with units incorporating L-O-X lockout valves, supports compliance with OSHA 1910.147 lockout/tagout requirements.
Material Standards	Bracket and panel nut hardware is manufactured from materials suitable for industrial pneumatic component mounting.

Typical Applications & Industries

Large Industrial Pneumatic Systems

Full-Size Series filter/regulator panel-mounted at 3/4 inch supply entries to large pneumatic control panels feeding multiple circuit branches, providing up to 180 scfm with operator-accessible panel-face pressure control.
MD4 Series integrated filter/regulator (up to 230 scfm) panel-mounted in high-flow pneumatic supply panels for press line and stamping press air supply, where large flow demand and panel-accessible adjustment are both required.
Full-Size or MD4 regulators panel-mounted in centralized air preparation panels for multi-machine supply, where each machine circuit is regulated at a dedicated panel-mounted FRL unit accessible from the panel face.

Automotive Body and Paint Operations

Full-Size filter/regulator panel-mounted at weld gun supply enclosures for high-cycle pneumatic resistance welding operations requiring up to 180 scfm at 1/2 inch supply ports.
MD4 Series panel-mounted integrated filter/regulators on paint line pneumatic enclosures for high-demand air supply at spray booth actuators and air-assisted application equipment.
Panel-mounted Full-Size FRL units in body shop pneumatic control panels where operator access to pressure adjustment must be from the panel face without exposing internal pneumatic connections.

Steel and Metal Processing

Full-Size Series panel-mounted filter/regulator for high-flow compressed air supply to pneumatic actuators on steel coil handling lines at 3/4 inch port supply.
MD4 Series (230 scfm) panel-mounted at main supply headers in heavy manufacturing facilities providing clean, regulated air to downstream distribution systems.
Panel-mounted Full-Size FRL units at machine tool supply panels in machining centers feeding multiple pneumatic clamping and indexing circuits simultaneously.

Packaging and Material Handling

Full-Size Series filter/regulator panel-mounted at high-speed packaging line supply cabinets for 1/2 inch circuits feeding multiple filling, sealing, and labeling actuators.
MD4 Series panel-mounted at high-demand air supply points in large distribution centers where multiple conveyor pneumatic circuits are supplied from a single panel-mounted FRL assembly.
Panel-mounted Full-Size regulators in palletizing system supply enclosures for large pneumatic cylinder actuation at pallet handling stations.

Ordering and Model Number Configuration

The Series Full-Size and MD4 Bracket Kit is available in three configurations. Select the complete 879K77 kit for new panel mount installations, or order bracket (878K77) and panel nut (880K77) individually for service replacement.

Model Numbers: 879K77 (Complete Kit), 878K77 (Bracket Only), 880K77 (Panel Nut Only)

879K77 = Full-Size / MD4 panel mounting kit (bracket + panel nut)

878K77 = Full-Size / MD4 panel mounting bracket only

880K77 = Full-Size / MD4 panel mounting nut only

K77 = ROSS Controls catalog designation (Kit, series 77 accessories)

Order 879K77 for new panel mount installations of Full-Size or MD4 Series FRL units.

Order 878K77 bracket only when the panel nut is intact.

Order 880K77 panel nut only when the bracket is retained.

Panel hole must be drilled to exactly 1.56 inches (40 mm) diameter before installation.

For MD3 Series units (different modular design), use R-A127-11 panel mounting kit with a 2.06-inch (52 mm) panel hole instead of the series.

One Series kit mounts one FRL unit. Order one kit per unit for panel assemblies.

Accessories

Complete Series Bracket Kit Options

Order the complete kit or individual components for new installation or service.

Component	Model Number
Complete Kit (bracket + panel nut)	879K77
Bracket only	878K77
Panel Nut only	880K77

Modular Assembly Connectors for Full-Size FRL

Connector kit required to interconnect Full-Size Series modular FRL units.

Description	Model Number
Connector Kit - Mid-Size, Full-Size, Bantam	892K77
Female Port Block 1/4 NPTF	893K77
Female Port Block 3/8 NPTF	894K77
Female Port Block 1/2 NPTF	895K77
Female Port Block 3/4 NPTF	896K77

Frequently Asked Questions (FAQ)

Q: What is in the 879K77 Full-Size bracket kit?

A: The 879K77 kit includes one 878K77 bracket and one 880K77 panel nut, all hardware required to panel-mount one Full-Size or MD4 Series FRL regulator or integrated filter/regulator.

Q: Is the panel hole the same size as for the Mid-Size bracket?

A: Yes. Both the series (Full-Size/MD4) and the 167 Series (Mid-Size) require a 1.56-inch (40 mm) diameter panel hole. This intentional standardization allows the same panel hole layout to be used for Mid-Size, Full-Size, and MD4 FRL installations.

Q: Does the series work with MD4 Series modular FRL units?

A: Yes. The Series bracket kit is designed for both Full-Size Series and MD4 Series FRL units. These are both in the larger FRL size range with 3/8, 1/2, and 3/4 inch ports.

Q: What flow can I achieve with a Full-Size panel-mounted FRL?

A: Full-Size Series integrated filter/regulators mounted with the series bracket support flow up to 180 scfm. MD4 Series units reach up to 230 scfm, making these the highest-flow panel-mountable FRL options in the ROSS product line.

Q: Can Full-Size FRL units with metal bowls use the series bracket?

A: Yes. Metal bowl and polycarbonate bowl Full-Size units use the same 879K77 bracket kit since the bracket attaches to the regulator body, which is the same regardless of bowl type.

Q: Is there a version for MD3 Series units?

A: No. MD3 Series units require the R-A127-11 panel mounting kit with a larger 2.06-inch (52 mm) panel hole. The Series (879K77) fits Full-Size and MD4 Series units only.

Q: Can the series be used for outdoor installations?

A: The bracket hardware is metallic and compatible with industrial outdoor enclosures. For outdoor applications, ensure the FRL unit's temperature range matches the ambient conditions: 40 to 125F for polycarbonate bowl units, 40 to 175F media for metal bowl units.

Q: Is there a pressure rating associated with the bracket itself?

A: The Series bracket is a mounting accessory and does not have its own pressure rating. The pressure rating of the complete FRL installation is determined by the Full-Size or MD4 Series FRL unit: polycarbonate bowls are rated to 150 psig (10 bar); metal bowls to 200 psig (14 bar).

Q: Can bracket and panel nut be ordered separately if one part is damaged?

A: Yes. Order 878K77 for bracket replacement or 880K77 for panel nut replacement without purchasing the complete 879K77 kit.

Q: Is this bracket suitable for stainless steel panel materials?

A: Yes. The bracket and panel nut are designed for use with standard industrial panel materials including carbon steel, stainless steel, and aluminum. Verify panel thickness compatibility with the ROSS FRL catalog dimensional drawings.

Q: How many bracket kits do I need for a modular Full-Size FRL assembly?

A: One bracket kit (879K77) is required per FRL unit being panel-mounted, regardless of how many modular units are connected in the assembly. In most panel mount configurations, only the regulator or integrated filter/regulator unit is panel-mounted; filter and lubricator modules are assembled behind the panel.

Q: Where can I get complete technical documentation for the series?

A: Dimensional drawings and installation instructions are in the ROSS FRL catalog (Form A10120), available at rosscontrols.com. Contact ROSS Controls at (800) 438-7677 for direct technical support.

Installation & Maintenance Guidelines

Drill a clean 1.56-inch (40 mm) diameter hole in the mounting panel. Deburr all edges for flat bracket contact.
Attach the 878K77 bracket to the Full-Size or MD4 FRL unit body following the catalog installation instructions.
Insert the bracketed FRL unit through the panel hole from the rear until the bracket shoulder contacts the panel surface.
Thread the 880K77 panel nut onto the bracket from the front panel face by hand until snug.
Tighten the panel nut with a wrench to clamp the FRL unit firmly to the panel. Verify no rotation in the panel hole.
Connect supply and downstream piping to the FRL ports from behind the panel. Use appropriate thread sealant on NPT threads.
Pressurize the system and inspect all connections for leaks before placing in service.
Set regulator outlet pressure at the front-panel adjustment knob to the desired set point.

Warranty & Global Support

ROSS Controls provides a one-year warranty on all products, covering defects in material and workmanship from date of purchase.

Global technical support available through ROSS offices in the USA, Canada, Brazil, Germany, France, United Kingdom, India, China, and Japan.

Contact ROSS Controls USA at (800) 438-7677 or visit rosscontrols.com for product configuration, technical support, and distributor locator services.

Complete Full-Size and MD4 FRL accessory catalog, dimensional drawings, and installation instructions are at rosscontrols.com or contact ROSS at (800) 438-7677.

Download Catalog: https://www.rosscontrols.com/en/series/162-full-size