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Flow Measurement Orifice Plates

Series 560 & 590 RTJ Orifice Plates & Plate Holders

Ring type joint orifice plates with an integral oval or octagonal ring gasket that mounts between RTJ flanges. No moving parts, built for high temperature, high pressure service. Need the bore sized? Our engineers will calculate it for you.

300#‑2500#Flange Ratings
2Designs: 560 & 590
304/316SS Standard
CNCPrecision Machined
Get A Quick Quote Request a Bore Calculation
Series 560 integral RTJ orifice plate Series 560 Integral RTJ Plate
Series 560 ring type joint orifice plate Series 560 Ring Type Joint
Series 590 RTJ plate holder with hold-down screws Series 590 Plate Holder
Engineering Service

Need a Bore Calculation? We'll Run It.

An orifice plate only measures as well as its bore, whether it's machined into a Series 560 or held in a Series 590. Send us your process data and our staff engineers will calculate the correct bore size and bevel, quickly and accurately, for a small fee. Then we machine the plate to match.

Request a Bore Calculation Call (800) 456-8721
How It Works

Bore Calculation Service

  1. Send Your Process DataFill out the bore calculation form for your project.
  2. Our Engineers Size the BoreWe calculate the correct bore size and bevel for your application.
  3. We Machine the PlateYour plate is bored and beveled to the calculation and shipped.
Start Your Bore Calculation
Choose Your Design

Series 560 vs. Series 590

Series 560 integral RTJ orifice plate
Integral Design

Series 560

The RTJ and plate are machined as one piece. Available in all ring sizes and stocked in 304 and 316 stainless steel. Best for permanent, precision installations.

Series 590 RTJ plate holder with hold-down screws
Hold-Down Screw Design

Series 590

Hold-down screws secure a Universal Plate that carries the orifice bore. Ideal where frequent replacement or bore changes are expected. Any metal available.

Product Overview

Ring Type Joint Orifice Plates

DesignIntegral oval or octagonal ring gasket mounts directly between ring type joint flanges. No moving parts, for reliability in demanding service.
ApplicationsClean liquids, gases, and low-velocity steam in high temperature, high pressure environments.
Flange Ratings300# • 600# • 900# • 1500# • 2500#. See the sizing chart.
Materials304 and 316 stainless steel standard. Made in any metal on request, from monel to hastelloy to copper-nickel.
CustomizationCustom thicknesses and full customization to your needs.
MachiningPrecision CNC machining for accuracy and quality control. Simple to use and easy to troubleshoot.
Orifice plate flow simulation
Orifice Plate Flow Simulation

Get a Quote or Order

Send us these details and we'll respond the same business day.

  • Series 560 or 590
  • Line size and flange rating
  • Plate thickness
  • Bore size (or request a bore calculation)
  • Material (304 SS, 316 SS, or other)
  • Quantity needed
  • Date needed
Get A Quick Quote Call (800) 456-8721
RTJ Plate Holder Sizing Chart

Select a Flange Rating

All sizes in inches.

Select Flange Rating to See Specifications

Select a flange rating above to view specifications
Common Questions

RTJ Orifice Plate FAQ

What types of RTJ orifice plate holders are available?

Series 560 and Series 590.

What's the difference between Series 560 and Series 590?

Series 560 is an integral design, with the RTJ and plate machined as one piece. Series 590 uses hold-down screws and a Universal Plate for the orifice bore.

Can you size the bore for me?

Yes. Our engineers can run your bore calculations for a small additional fee. Request a bore calculation.

Can I order a custom thickness?

Yes. We can fully customize your orifice plates.

What materials are available?

We stock 304 and 316 stainless steel, and make plates in any material requested, from monel to hastelloy to copper-nickel alloys and more.

Related Products & Resources
Bore Calculation Form Series 500 Universal Series 520 Paddle Type Restriction Orifice Unions Download Line Sheets

Orifice Plates

Why USA Industries?

40+ years of manufacturing excellence and innovation

Fast Turnaround

Fastest Turnaround

Same-day shipping available on stock items. Custom orders in days, not weeks.

In-House Manufacturing

Manufactured In-House

U.S. produced steel, PMI verified, QC certified.

ISO Certified

ISO 9001:2015 Certified

Quality-driven manufacturing process ensures excellence.

Engineering-Innovation

Engineering Innovation

Precision-Engineered Industrial Solutions — Delivered Fast!

USA Materials

100% USA Materials

All raw materials sourced from American mills.

Our product specialists are available 24/7. Call Now.

(800) 456-8721
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