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View Flow Restrictors for
Photo 1 - 5.5mm-Insert-Orifice-Gas-Scrn-Unscrn
Photo 2 - 5.5mm-Insert-Orifice-Gas-Scrn
Flow Restrictors

5.5 mm Insert Single-Orifice Restrictor for Gases

This highly accurate flow restrictor is self-retained, threadless, and reliable. The orifice is designed for installation into metal housings and is 100% flow tested on nitrogen to ensure that every part is within ± 5% of its nominal flow rate. Tighter tolerances are available as custom configurations. To increase accuracy, the orifice is tested in the direction of use. An integral safety screen is incorporated for configurations with an orifice diameter of 0.5 mm (0.020 of an inch) or below. This restrictor is constructed entirely of stainless steel.

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Key Product Facts
  • Mounting Configuration:Insert - Into Metal
  • Diameter:5.46 mm
  • Metered Flow Range:500 - 45,000 Lohms
  • Test Fluid:Clean & Dry Nitrogen
  • Maximum Working Pressure:21 MPa

Product Information

General Performance
Characteristic Specification
Lohm Rate Tolerance ± 5%
Test Fluid Clean and Dry Nitrogen
Maximum Working Pressure 21 MPa
Designed for Installation Into Metals, Such as Aluminum, Brass, Cast Iron, Stainless Steel, and Steel
Materials
COMPONENT MATERIAL
Body 303 Stainless Steel
Pin, Unscreened 416 Stainless Steel
Pin, Screened 303 Stainless Steel
Screen 316 Stainless Steel
Screen Body 305 Stainless Steel
Cross Section Views
Unscreened Metered Flow Reverse Configuration
Dimensional Views
Unscreened Metered Flow Forward Configuration
This image is for reference only. All dimensions are in millimeters.
*Overall length before installation.
Installation Hole Details
Unscreened Metered Flow Forward and Reverse Configurations
Installation Hole Drawing Number: 1INST013800S
This image is for reference only. All dimensions are in millimeters.

Part Numbers & Specifications

This table below contains the part numbers and technical specifications for this product. If you have specific questions, need a quote, or would like to request a handbook or drawing, click the red request button in the column on the far right.

Part Numbers & Specifications
PART NUMBER FLOW DIRECTION LOHM RATE SCREEN MICRON RATING APPROXIMATE WEIGHT (g) INSTALLATION HOLE DRAWING NUMBER Request Information
RIGF5551005S Forward 500 Lohms N/A 0.55 1INST013800S Request
RIGF5551006S Forward 600 Lohms N/A 0.55 1INST013800S Request
RIGF5551008S Forward 800 Lohms N/A 0.55 1INST013800S Request
RIGF5551010S Forward 1000 Lohms N/A 0.55 1INST013800S Request
RIGF5551012S Forward 1200 Lohms N/A 0.55 1INST013800S Request
RIGF5551015S Forward 1500 Lohms N/A 0.55 1INST013800S Request
RIGF5553020S Forward 2000 Lohms 125 microns 0.63 1INST013800S Request
RIGF5553025S Forward 2500 Lohms 125 microns 0.63 1INST013800S Request
RIGF5553030S Forward 3000 Lohms 125 microns 0.63 1INST013800S Request
RIGF5553040S Forward 4000 Lohms 125 microns 0.63 1INST013800S Request
RIGF5553050S Forward 5000 Lohms 125 microns 0.63 1INST013800S Request
RIGF5553060S Forward 6000 Lohms 75 microns 0.62 1INST013800S Request
RIGF5553080S Forward 8000 Lohms 75 microns 0.62 1INST013800S Request
RIGF5553100S Forward 10,000 Lohms 75 microns 0.62 1INST013800S Request
RIGF5553120S Forward 12,000 Lohms 75 microns 0.62 1INST013800S Request
RIGF5553150S Forward 15,000 Lohms 75 microns 0.62 1INST013800S Request
RIGF5553200S Forward 20,000 Lohms 40 microns 0.63 1INST013800S Request
RIGF5553250S Forward 25,000 Lohms 40 microns 0.63 1INST013800S Request
RIGF5553300S Forward 30,000 Lohms 40 microns 0.63 1INST013800S Request
RIGF5553400S Forward 40,000 Lohms 40 microns 0.63 1INST013800S Request
RIGF5553450S Forward 45,000 Lohms 40 microns 0.63 1INST013800S Request
RIGR5551005S Reverse 500 Lohms N/A 0.55 1INST013800S Request
RIGR5551006S Reverse 600 Lohms N/A 0.55 1INST013800S Request
RIGR5551008S Reverse 800 Lohms N/A 0.55 1INST013800S Request
RIGR5551010S Reverse 1000 Lohms N/A 0.55 1INST013800S Request
RIGR5551012S Reverse 1200 Lohms N/A 0.55 1INST013800S Request
RIGR5551015S Reverse 1500 Lohms N/A 0.55 1INST013800S Request
RIGR5557020S Reverse 2000 Lohms 125 microns 0.8 1INST067426S Request
RIGR5557025S Reverse 2500 Lohms 125 microns 0.8 1INST067426S Request
RIGR5557030S Reverse 3000 Lohms 125 microns 0.8 1INST067426S Request
RIGR5557040S Reverse 4000 Lohms 125 microns 0.8 1INST067426S Request
RIGR5557050S Reverse 5000 Lohms 125 microns 0.8 1INST067426S Request
RIGR5557060S Reverse 6000 Lohms 75 microns 0.8 1INST067426S Request
RIGR5557080S Reverse 8000 Lohms 75 microns 0.8 1INST067426S Request
RIGR5557100S Reverse 10,000 Lohms 75 microns 0.8 1INST067426S Request
RIGR5557120S Reverse 12,000 Lohms 75 microns 0.8 1INST067426S Request
RIGR5557150S Reverse 15,000 Lohms 75 microns 0.8 1INST067426S Request
RIGR5557200S Reverse 20,000 Lohms 40 microns 0.8 1INST067426S Request
RIGR5557250S Reverse 25,000 Lohms 40 microns 0.8 1INST067426S Request
RIGR5557300S Reverse 30,000 Lohms 40 microns 0.8 1INST067426S Request
RIGR5557400S Reverse 40,000 Lohms 40 microns 0.8 1INST067426S Request
RIGR5557450S Reverse 45,000 Lohms 40 microns 0.8 1INST067426S Request
The following legacy part numbers have been replaced by the part numbers listed in the table above, respectively. For more information on these legacy part numbers, please reach out to your local Lee Sales Engineer.
RIGR5553020S, RIGR5553025S, RIGR5553030S, RIGR5553040S, RIGR5553050S, RIGR5553060S, RIGR5553080S, RIGR5553100S, RIGR5553120S, RIGR5553150S, RIGR5553200S, RIGR5553250S, RIGR5553300S, RIGR5553400S, and RIGR5553450S.

Installation & Accessories

Installation & Manufacturing Tools
Replacement Parts & Accessories
PART NUMBER DESCRIPTION
CCRT0900120S 5.5 mm Insert Orifice Installation Tool

CAD Envelopes

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The Lee Company has developed the Lohm Laws for defining and measuring resistance to fluid flow. The Lohm is defined such that 1 Lohm will flow 100 GPM of water with a pressure drop of 25 psi at a temperature of 80°F.

Lohms for Liquids Lohms for Gases