Product Overview
4" × 3" CL150 SA516-70 Studded Reducing Flange Studded Reducer
Hess Services' 4" × 3" Studded Reducing Flange / Studded Reducer is manufactured from SA516-70 carbon steel and is designed to reduce pipe size while providing a studded flanged connection for pressure vessels, storage tanks, separators, and industrial piping systems.
Available with or without an optional 1" NPT threaded port and in multiple standard finish colors.
Important: This product is available with or without a 1" NPT threaded port. Please verify that the selected threaded port configuration matches your application before placing your order.
Standard Features
- Manufactured from SA516-70 carbon steel
- Class 150 pressure class
- Available with or without an optional 1" NPT threaded port
- Available in multiple standard finish colors
- Machined gasket seating surface
- Serrated concentric flange face, 45–55 grooves per inch
- Flange face finish: 125–250 µin Ra
- Machined in accordance with Hess Services shop drawings
- Suitable for industrial, oil & gas, and pressure vessel applications
The gasket seating surface is precision machined with serrated concentric grooves (45–55 grooves per inch) and a surface finish of Ra 125–250 µin using a 1/16" or larger tool radius.
Hardware Information
- Compatible with standard 5/8"-11 UNC studs.
- Studs, nuts, washers, and gasket sold separately.
- Bolt patterns are factory clocked according to the engineering drawing for proper flange alignment.
Manufactured by Hess Services in Kansas, USA
Connection Specifications
| Specification | 4" End | 3" End |
|---|---|---|
| Tapped Stud Holes | 8 | 4 |
| Thread Size | 5/8"-11 UNC | 5/8"-11 UNC |
| Bolt Circle Diameter (BC) | 7.500" | 6.000" |
| Minimum Thread Depth | 0.965" | 0.965" |
| Bolt Hole Spacing | 45° | 90° |
