Stainless steel hex socket flange pipe plugs combine a compact internal drive, male thread, flange face, and replaceable sealing ring in one closure component. They are used to close unused ports in manifolds, valves, pumps, hydraulic equipment, process machinery, and OEM assemblies where external wrench clearance is limited.
Product Specifications and Custom Options
| Product type | Male-threaded flange plug with internal hex socket |
|---|---|
| Body material | Stainless steel or project-specified engineering alloy |
| Thread options | Metric, BSPP, BSPT, NPT, or drawing-specific |
| Drive | Internal hex socket; socket size and depth to specification |
| Seal | Elastomer sealing ring selected for the fluid, temperature, pressure, and mating interface |
| Finish | Machined, cleaned, passivated, polished, or project-specific |
| Customization | Thread, flange diameter, head height, socket, seal groove, material, marking, testing, and packaging |
Flange and O-Ring Sealing Interface
The flange provides a controlled stop and supports a face-sealing arrangement at the mating port. Seal performance depends on groove geometry, flange flatness, surface finish, mating-face condition, elastomer compound, compression, installation torque, fluid, temperature, and pressure. These items should be specified as an assembly rather than selected from nominal thread size alone.
Design and Ordering Considerations
Confirm the exact mating thread standard and sealing-face dimensions. Parallel and taper threads, as well as NPT, BSP, and metric forms, are not automatically interchangeable. Provide the permitted installation envelope and tool access so the internal hex socket can transmit the required tightening torque without excessive stress.
Key Product Features
- Low-profile internal hex drive for confined assemblies
- Integrated flange for controlled installation depth and face sealing
- Custom threads, flange dimensions, socket sizes, and sealing grooves
- Optional passivation, material verification, gauging, and project marking
Typical Applications
- Hydraulic and pneumatic manifolds
- Pumps, valves, gearboxes, and process equipment
- Oil filling, drain, test, and inspection ports
- Industrial machinery and custom OEM assemblies
Pressure and Media Compatibility
No universal pressure rating should be assigned to the plug alone. Allowable service depends on body material, thread engagement, mating component, flange and groove geometry, seal compound, installation torque, fluid, temperature, cycling, and applicable code. Final pressure and leakage requirements must be confirmed from the approved assembly specification.
Quality Control and Inspection
Inspection can include material verification, thread gauging, internal socket dimensions, flange flatness, groove dimensions, surface condition, seal identification, cleanliness, and lot traceability. Dimensional reports, material certificates, and project-specific leakage or pressure testing can be supplied when included in the purchase requirements.
OEM Customization and RFQ Information
For an accurate quotation, please provide:
- Complete thread designation and mating-port drawing
- Body material and required surface treatment
- Flange, socket, groove, and overall dimensions
- Fluid, working pressure, temperature, and seal material requirement
- Quantity, inspection, testing, marking, packaging, and destination
Request a quote for this component, browse related pipe fittings and couplings, or review AODSON CNC machining and quality control capabilities.
Frequently Asked Questions
Can the thread and internal hex dimensions be customized?
Yes. Thread form, engagement length, flange diameter, socket size and depth, groove geometry, material, and finish can be produced to an approved drawing after feasibility review.
Which O-ring material should be used?
The seal compound must be selected from the actual fluid, temperature, pressure, exposure time, and applicable customer standard. Provide these conditions so compatibility can be reviewed before quotation.
What is needed to establish a pressure rating?
Please provide the complete mating-port design, material, thread engagement, seal arrangement, installation torque, fluid, temperature, pressure cycle, and required code or test method. The rating applies to the approved assembly, not the plug image alone.
