Series 500 Universal Orifice Plates
Simple to use and easy to troubleshoot. Precision CNC machined for superior accuracy and quality control, and built to AGA, ISA, ANSI, ASME, and API standards. Need the bore sized? Our engineers will calculate it for you.
Need a Bore Calculation? We'll Run It.
An orifice plate only measures as well as its bore. 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.
Bore Calculation Service
- Send Your Process DataFill out the bore calculation form for your project.
- Our Engineers Size the BoreWe calculate the correct bore size and bevel for your application.
- We Machine the PlateYour plate is bored and beveled to the calculation and shipped.
Get a Quote or Order
Send us these details and we'll respond the same business day.
- Line size
- Plate thickness
- Bore size (or request a bore calculation)
- Bevel or no bevel
- Material (304 SS, 316 SS, or other)
- Quantity needed
- Date needed
| Specification | Details |
|---|---|
| Line Sizes | 1" – 24" |
| Stocked Materials | 304 SS • 316 SS (any alloy on request) |
| Other Alloys | Monel • Hastelloy • Copper-Nickel • More |
| Machining | Precision CNC |
| Bore | Bevel or no bevel (bore calculation service available) |
| Compatibility | Standard orifice fittings • RTJ plate holders • Single or dual chamber |
| Seal Rings | Hycar® seal rings / o-rings available |
| Coatings | Custom coatings on request |
| Maintenance | Minimal |
| Shipping | In-stock items ship within 24 hours (same-day local delivery in Texas) |
Differential Pressure Flow Measurement
Universal orifice plates are widely used to measure differential pressure flow for their simplicity, reliable performance, easy installation, and resilience to harsh conditions. Each plate is made to rigorous manufacturing processes and accuracy standards, tailored to your application.
Orifice Plate Sizing Chart
| NPSNominal Pipe Size | ABore Dia. | LBevel Length | TThickness |
|---|---|---|---|
| 1" | 1.312" | .02" | 1/8" |
| 1-1/2" | 2" | .03" | 1/8" |
| 2" | 2.437" | .03" | 1/8" |
| 2-1/2" | 2.812" | .03" | 1/8" |
| 3" | 3.437" | .03" | 1/8" |
| 4" | 4.406" | .06" | 1/8" |
| 5" | 6" | .06" | 1/8" |
| 6" | 6.437" | .06" | 1/8" |
| 8" | 8.437" | .125" | 1/4" |
| 10" | 10.687" | .125" | 1/4" |
| 12" | 12.593" | .25" | 1/4" |
| 14" | 14" | .25" | 1/4" |
| 16" | 16" | .25" | 3/8" |
| 18" | 18" | .25" | 3/8" |
| 20" | 20" | .375" | 3/8" |
| 24" | 24" | .375" | 3/8" |
All dimensions in inches. NPS = nominal pipe size. 'A' dimensions do not include the seal ring. Chart DS-OP-500.
Universal Orifice Plate FAQ
Can you determine what size bore I need?
Yes. We usually work from the bore calculations you provide, but our staff engineers can run the calculations for a small additional fee. Request a bore calculation.
Do you sell the seal rings for the Universal Orifice Plates?
Yes. We offer Hycar® seal rings / o-rings that fit our universal orifice plates. Add them to your order to ship together. Hycar® is a registered trademark of Lubrizol Advanced Materials.
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.
Do you keep plates in stock?
Yes. Many sizes are ready in stock and only need a bore punched.
Can you apply custom coatings?
Yes. We regularly coat orifice plates. Tell us what you need.
Why USA Industries?
40+ years of manufacturing excellence and innovation
Fastest Turnaround
Same-day shipping available on stock items. Custom orders in days, not weeks.
Manufactured In-House
U.S. produced steel, PMI verified, QC certified.
ISO 9001:2015 Certified
Quality-driven manufacturing process ensures excellence.
Engineering Innovation
Precision-Engineered Industrial Solutions — Delivered Fast!
100% USA Materials
All raw materials sourced from American mills.