Mounting Flange / Threads: Pressure Rating PN16/PN25

Component Specifications

Definition

A precision-engineered mounting component featuring standardized flange geometry and threaded interfaces designed to provide leak-proof, vibration-resistant connections between overflow weirs/nozzles and processing equipment. The component ensures proper alignment, mechanical stability, and fluid containment in high-pressure industrial applications.

Working Principle

Utilizes flange face sealing with gasket compression and threaded fastening to create a rigid, sealed interface. The flange distributes mechanical loads evenly across the mounting surface while threaded connections provide precise axial alignment and secure attachment against hydraulic forces and vibration.

Materials

Stainless steel (AISI 304/316), carbon steel (ASTM A105), or alloy steel with corrosion-resistant coatings. Thread specifications: ISO 228/ISO 7-1 for parallel/tapered threads.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thread Type	ISO 228 G1/2" to G2"
Surface Finish	Ra ≤ 3.2 μm
Flange Standard	ISO 7005-1
Pressure Rating	PN16/PN25
Flatness Tolerance	≤ 0.1 mm
Bolt Circle Diameter	As per flange standard

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 7005-1, ISO 228, ISO 7-1, DIN 2632, DIN 2999

Parent Products

This component is used in the following industrial products

Overflow Weir or Nozzle

A component of a water collection sump designed to manage excess water flow, either through an overflow weir that allows water to spill over at a set level or a nozzle that directs controlled discharge.

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Engineering Analysis

Risks & Mitigation

Thread galling during installation
Flange face damage compromising seal
Improper bolt torque causing leaks
Material incompatibility with process fluids
Vibration-induced loosening

FMEA Triads

Trigger: Incorrect installation torque
Failure: Gasket compression failure leading to leaks
Mitigation: Use calibrated torque wrenches and follow manufacturer specifications

Trigger: Thread contamination
Failure: Cross-threading and connection damage
Mitigation: Clean threads before assembly and use thread lubricants

Trigger: Material fatigue from cyclic loading
Failure: Flange cracking under vibration
Mitigation: Implement regular inspection schedules and use locking fasteners

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Flange flatness: ±0.1 mm, Thread pitch: ±0.05 mm, Bolt hole alignment: ±0.5°

Test Method

Hydrostatic pressure testing per ISO 5208, Helium leak testing for critical applications, Dimensional verification with CMM

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Mounting Flange / Threads

Manufacturer profiles associated with Mounting Flange / Threads.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between ISO 228 and ISO 7-1 threads on mounting flanges?

ISO 228 specifies parallel (straight) threads for mechanical connections where sealing is achieved with gaskets, while ISO 7-1 defines tapered threads that create pressure-tight seals through thread deformation, commonly used for smaller diameter connections.

How do I select the correct flange pressure rating for an overflow weir application?

Select PN16 for standard pressure applications (≤16 bar) or PN25 for high-pressure systems (≤25 bar). Consider fluid properties, temperature, and surge pressures. Always verify against system design pressure with a safety factor of 1.5x.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Mounting Flange / Threads