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View Flow Restrictors for
2.5mm-Insert--Orifice-Gas-Scrn-Unscrn
2.5mm-Insert-Orifice-Gas-Scrn
Flow Restrictors

2.5 mm Insert Single-Orifice Restrictor for Gases

This self-retained, threadless restrictor is the smallest available, allowing designers to save space and weight in metal housings. The orifice 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:2.54 mm
  • Metered Flow Range:1200 - 45,000 Lohms
  • Test Fluid:Clean & Dry Nitrogen
  • Maximum Working Pressure:21 MPa (In Aluminum)
For More Information

Product Information

General Performance
Characteristic Specification
Lohm Rate Tolerance ± 5%
Test Fluid Clean and Dry Nitrogen
Maximum Working Pressure 21 MPa (In Aluminum)
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 303 Stainless Steel
Cross Section Views
2.5 mm Insert Orifice For Gases
Unscreened Metered Flow Forward Configuration
Cross Section 2, 2.5 mm Insert Orifice For Gases
Cross Section 3, 2.5 mm Insert Orifice For Gases
Dimensional Views
2D 1, 2.5 mm Insert Orifice For Gases
Unscreened Metered Flow Forward Configuration
This image is for reference only. All dimensions are in millimeters.
*Overall length before installation.
2D 2, 2.5 mm Insert Orifice For Gases
2D 3, 2.5 mm Insert Orifice For Gases
2D 4, 2.5 mm Insert Orifice For Gases
Installation Hole Details
Installation Hole 1, 2.5 mm Insert Orifice For Gases
Unscreened Metered Flow Forward and Reverse Configurations
Installation Hole Drawing Number: 1INST025565S
This image is for reference only. All dimensions are in millimeters.
Installation Hole 2, 2.5 mm Insert Orifice For Gases
Installation Hole 3, 2.5 mm Insert Orifice For Gases

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
RIGF2551012S Forward 1200 Lohms N/A 0.08 1INST025565S Request
RIGF2551015S Forward 1500 Lohms N/A 0.08 1INST025565S Request
RIGF2551020S Forward 2000 Lohms N/A 0.08 1INST025565S Request
RIGF2551025S Forward 2500 Lohms N/A 0.08 1INST025565S Request
RIGF2551030S Forward 3000 Lohms N/A 0.08 1INST025565S Request
RIGF2551040S Forward 4000 Lohms N/A 0.08 1INST025565S Request
RIGF2551050S Forward 5000 Lohms N/A 0.08 1INST025565S Request
RIGF2551060S Forward 6000 Lohms N/A 0.08 1INST025565S Request
RIGF2553080S Forward 8000 Lohms 40 microns 0.1 1INST038333S Request
RIGF2553100S Forward 10,000 Lohms 40 microns 0.1 1INST038333S Request
RIGF2553120S Forward 12,000 Lohms 40 microns 0.1 1INST038333S Request
RIGF2553150S Forward 15,000 Lohms 40 microns 0.1 1INST038333S Request
RIGF2553200S Forward 20,000 Lohms 40 microns 0.1 1INST038333S Request
RIGF2553250S Forward 25,000 Lohms 40 microns 0.1 1INST038333S Request
RIGF2553300S Forward 30,000 Lohms 40 microns 0.1 1INST038333S Request
RIGF2553400S Forward 40,000 Lohms 40 microns 0.1 1INST038333S Request
RIGF2553450S Forward 45,000 Lohms 40 microns 0.1 1INST038333S Request
RIGR2551012S Reverse 1200 Lohms N/A 0.08 1INST025565S Request
RIGR2551015S Reverse 1500 Lohms N/A 0.08 1INST025565S Request
RIGR2551020S Reverse 2000 Lohms N/A 0.08 1INST025565S Request
RIGR2551025S Reverse 2500 Lohms N/A 0.08 1INST025565S Request
RIGR2551030S Reverse 3000 Lohms N/A 0.08 1INST025565S Request
RIGR2551040S Reverse 4000 Lohms N/A 0.08 1INST025565S Request
RIGR2551050S Reverse 5000 Lohms N/A 0.08 1INST025565S Request
RIGR2551060S Reverse 6000 Lohms N/A 0.08 1INST025565S Request
RIGR2553080S Reverse 8000 Lohms 40 microns 0.1 1INST038336S Request
RIGR2553100S Reverse 10,000 Lohms 40 microns 0.1 1INST038336S Request
RIGR2553120S Reverse 12,000 Lohms 40 microns 0.1 1INST038336S Request
RIGR2553150S Reverse 15,000 Lohms 40 microns 0.1 1INST038336S Request
RIGR2553200S Reverse 20,000 Lohms 40 microns 0.1 1INST038336S Request
RIGR2553250S Reverse 25,000 Lohms 40 microns 0.1 1INST038336S Request
RIGR2553300S Reverse 30,000 Lohms 40 microns 0.1 1INST038336S Request
RIGR2553400S Reverse 40,000 Lohms 40 microns 0.1 1INST038336S Request
RIGR2553450S Reverse 45,000 Lohms 40 microns 0.1 1INST038336S Request

Installation & Accessories

Installation & Manufacturing Tools
Replacement Parts & Accessories
PART NUMBER DESCRIPTION
CCRT0029354S 2.5 mm Restrictor Installation Tool

CAD Envelopes

Resources

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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