Threads/Flange: Temperature Range -20°C to 200°C

Component Specifications

Definition

A threaded flange is a specialized hydraulic connector component featuring precision-machined threads that mate with corresponding threads on pipes, valves, or other hydraulic elements. It serves as a mechanical interface that creates a sealed, pressure-resistant joint in hydraulic systems, typically used in applications where disassembly is required for maintenance or component replacement. The flange portion provides a flat sealing surface for gaskets or O-rings, while the threads ensure mechanical engagement and alignment.

Working Principle

The threaded flange operates on the principle of mechanical thread engagement combined with compressive sealing. When tightened, the threads draw the flange faces together, compressing a gasket or seal between them to create a fluid-tight barrier. The threads provide axial force to maintain compression, while the flange distributes this force evenly across the sealing surface. This dual mechanism ensures both mechanical connection integrity and hydraulic sealing under pressure.

Materials

Carbon steel (ASTM A105), stainless steel (304/316), alloy steel, brass, or specialized alloys for corrosive environments. Surface treatments include zinc plating, galvanization, or passivation for corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Size Range	1/8" to 2" nominal diameter
Thread Type	NPT, BSPP, BSPT, SAE, Metric
Surface Finish	Ra 3.2 μm or better
Pressure Rating	3000-6000 PSI
Thread Tolerance	Class 2A/2B or 6g/6H
Temperature Range	-20°C to 200°C

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 1179, ISO 6149, DIN 3852, SAE J514, ANSI B1.20.1

Parent Products

This component is used in the following industrial products

Hydraulic Connector

A specialized fitting that joins hydraulic lines and components within a Blowout Preventer (BOP) system, enabling the transmission of high-pressure hydraulic fluid to actuate critical safety functions.

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Engineering Analysis

Risks & Mitigation

Thread stripping from overtightening
Cross-threading during assembly
Leakage from improper sealing
Material incompatibility with hydraulic fluid
Fatigue failure from vibration

FMEA Triads

Trigger: Incorrect torque application during installation
Failure: Thread stripping or insufficient sealing pressure
Mitigation: Use calibrated torque wrenches, follow manufacturer torque specifications, implement torque verification procedures

Trigger: Vibration in hydraulic systems
Failure: Thread loosening leading to leaks
Mitigation: Use thread-locking compounds where appropriate, implement regular inspection schedules, consider alternative connection methods for high-vibration areas

Trigger: Material corrosion from hydraulic fluid or environment
Failure: Thread degradation and sealing surface pitting
Mitigation: Select corrosion-resistant materials, apply protective coatings, implement preventive maintenance with corrosion inspection

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thread dimensions per ISO 1179-1 tolerance class Medium, sealing surface flatness within 0.1mm, thread pitch tolerance ±0.025mm

Test Method

Pressure testing per ISO 19879, leak testing with helium mass spectrometry, dimensional verification with thread gauges, material certification per ASTM standards

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.

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Manufacturers of Threads/Flange

Manufacturer profiles associated with Threads/Flange.

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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 NPT and BSPP threaded flanges?

NPT (National Pipe Taper) threads are tapered and seal through thread interference, while BSPP (British Standard Pipe Parallel) threads are parallel and require a separate sealing washer or O-ring. NPT is common in North America, BSPP in Europe and Asia.

How do I prevent leakage in threaded flange connections?

Use proper thread sealant (like PTFE tape or liquid thread sealant for NPT), ensure correct torque specification, use undamaged threads, and replace worn gaskets. For BSPP threads, always use the specified sealing washer.

Can threaded flanges be used in high-pressure hydraulic systems?

Yes, when properly specified. High-pressure applications require higher grade materials (like alloy steel), proper thread engagement length, and adherence to pressure ratings. Always verify the flange's pressure rating exceeds system requirements.

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.

Threads/Flange