Flanges for industrial distribution, project purchasing and OEM supply, with material, finish and documentation agreed per quotation.
Pipe fittings connect, redirect, branch, reduce or terminate a piping run. Joint method, nominal size, pressure class, media, temperature, material compatibility and applicable standards govern selection.
Most parts in this range are made or adapted for a drawing, sample, mating interface and order program. The image on this page represents the product family; final geometry, material, finish, inspection and marking are confirmed in the quotation.
Flanges create a removable pipe joint, nozzle connection or blind closure. Weld-neck, slip-on, socket-weld, threaded, lap-joint and blind patterns distribute loads differently and have distinct fabrication requirements. Facing type, class and drilling must match the mating flange; nominal size alone is not enough.
ASME B16.5 covers pipe flanges and flanged fittings through its stated size range and includes ratings, materials, dimensions, tolerances, marking, testing, bolting, gaskets and joints. Larger steel flanges may use ASME B16.47, while gray-iron products use ASME B16.1. Common forged materials include ASTM A105 carbon steel, ASTM A350 low-temperature steel and ASTM A182 alloy or stainless grades. Confirm material group against class and temperature.
Specify type, NPS, class, facing, bore or matching schedule, material, corrosion allowance and finish. Select gasket and bolting as part of the same joint. Inspect faces, serrations, bolt holes and gasket condition. Bring aligned flanges together without using bolts as jacks, center the gasket, lubricate only as approved and tighten in controlled cross-pattern passes.
Can raised-face and flat-face flanges be mixed? Only when design permits. Can a gasket be reused? Normally no unless expressly allowed. Does a higher class always fit? No; drilling, facing, thickness and rating must be checked.
Research sources: ASME B16.5-2025 official scope; ASME B16.47; ASME B16.1; ASTM A105/A350/A182. Assembly values are per engineering procedure.
Flanges belongs to the piping component category. Material names, standards and coating descriptions below help buyers structure an RFQ; they are not a declaration that every offered configuration complies. Grade, edition, inspection level and acceptance criteria belong on the controlled drawing or purchase specification. (industry reference data, final values per drawing/quotation)
Malleable iron, ductile iron, gray iron, carbon steel and stainless steel are common specification routes. The selected grade must suit the manufacturing process, wall geometry, joining method and medium; a material family alone does not establish service suitability.
Use the tensile strength, yield or proof strength, elongation, hardness, impact and heat-treatment requirements published for the selected material grade. Relevant properties differ by product form and test-piece basis. They describe material quality, not the capacity of the finished Flanges; final suitability depends on geometry, interfaces, manufacturing condition and verification.
Specify plain, zinc-coated, hot-dip galvanized, painted, passivated or another compatible finish by a recognized coating specification where applicable. Define preparation, appearance, restricted substances, repair rules, packaging and required inspection documents instead of relying on a color photograph.
| Reference | Standard name | How to use it |
|---|---|---|
| ASME B16.3 | Malleable Iron Threaded Fittings | Use as an RFQ reference only when applicable; edition, scope and acceptance evidence must be agreed. |
| ASME B16.4 | Gray Iron Threaded Fittings | Use as an RFQ reference only when applicable; edition, scope and acceptance evidence must be agreed. |
| ASME B16.11 | Forged Fittings, Socket-Welding and Threaded | Use as an RFQ reference only when applicable; edition, scope and acceptance evidence must be agreed. |
| ASME B1.20.1 | Pipe Threads, General Purpose (Inch) | Use as an RFQ reference only when applicable; edition, scope and acceptance evidence must be agreed. |
| ISO 7-1 | Pipe threads where pressure-tight joints are made on the threads | Use as an RFQ reference only when applicable; edition, scope and acceptance evidence must be agreed. |
| EN 10204 | Metallic products — Types of inspection documents | Use as an RFQ reference only when applicable; edition, scope and acceptance evidence must be agreed. |
Specification caution: naming a material, coating or dimensional standard does not create a product rating, approval, certification or warranty. Any required capacity, pressure class, temperature limit, listing or test must be confirmed for the exact quoted part. (industry reference data, final values per drawing/quotation)
Selection for Flanges should begin with nominal size, end connection, pressure class, design temperature, conveyed medium, corrosion allowance and system code. Keep required facts separate from supplier proposals so reviewers can see what is mandatory and what remains open. (industry reference data, final values per drawing/quotation)
| Decision | Information to provide | Why it matters |
|---|---|---|
| Interface and geometry | Drawing, nominal or actual dimensions, tolerances, mating components, clearances, orientation and accessible assembly space. | Prevents selection from a family name or image and allows the complete connection to be checked. |
| Service condition | Function, direction of forces, movement, vibration, indoor or outdoor exposure, moisture, chemicals and maintenance access. | Guides material, finish, locking, restraint and inspection choices without inventing an unverified rating. |
| Compliance route | Destination market, governing code, required standard edition, customer specification, marking and third-party approval needs. | Separates a generally suitable design from a configuration qualified for a regulated project. |
| Supply and quality | Quantity, release pattern, drawing revision, critical characteristics, sampling, traceability, packaging and documents. | Aligns manufacturing and inspection with the commercial requirement and repeat-order control. |
Ask the supplier to identify exclusions and assumptions in the quotation. Compare offers against the same revision and requirement list; a lower price is not comparable if material, coating, inspection, packaging or documentation scope differs. Final commercial values remain per quotation.
(industry reference data, final values per drawing/quotation)
Match labels, part identity, material or heat references where required, quantity and documents to the purchase order. Quarantine mixed, damaged, corroded or unidentifiable pieces instead of releasing them to installation.
Verify the actual mating dimensions, thread or connection form, contact surfaces, orientation and working clearance. Clean protective debris without removing functional coatings or altering critical edges.
Clean and inspect the mating pipe and ends, confirm thread or joint compatibility, align without forcing, use only the specified sealant or gasket, support the pipe independently, and apply the approved assembly procedure. Never use a fitting to pull misaligned pipework into place. Any torque, clearance, sealant, gasket, lubrication or locking value must come from the approved instruction for the exact product.
Record completion where the quality plan requires it. Inspect for seating, alignment, locking, leakage where relevant, coating damage and interference. Establish service checks from the system risk assessment and replace parts that fail the applicable acceptance criteria.
Compare threaded, grooved, flanged and welded routes by installation access, dismantling needs, system code, leakage control, maintenance plan and the qualifications available on site. Compatibility includes the mating dimensions, material couple, coating, fastener or seal system, installation method, inspection basis and service environment. (industry reference data, final values per drawing/quotation)
Best when an established size, connection and documented product scope match the application. Confirm the exact designation and do not extend published information to another variant.
Useful when the required function or interface differs. Review the whole assembly, because an alternative component can move forces, change clearances or require different accessories and installation controls.
Consider when geometry, material, marking, finish or packaging cannot be met by a standard item. Freeze the drawing, validation plan and change-control route before repeat production.
(industry reference data, final values per drawing/quotation)
No. The reference helps define material, dimensions, coating, test method or use practice within its own scope. Compliance requires the applicable edition, product configuration, acceptance criteria and agreed evidence. A standards list on a general webpage is not a certificate.
Name the material standard, grade, product form, heat-treatment condition where relevant, required inspection document and any supplementary tests. Use the values in the governing published standard rather than copying an isolated number. Finished-product capacity or performance still requires design and verification for the exact geometry.
Provide a legible drawing or complete dimensional description, application and mating parts, material and finish, quantity and release schedule, destination market, required standards, critical characteristics, marking, packaging and document needs. Identify any requirement that cannot change.
Only after technical and commercial review. A substitute can change strength, ductility, corrosion behavior, friction, thread fit, coating thickness, galvanic compatibility, manufacturing route and inspection evidence. Record an approved deviation before production.
Request verified data for the exact part number, revision, material, assembly orientation and mating components. The quotation or approved technical package should state the applicable basis. This page intentionally supplies no invented load, pressure, temperature or price values.
Check identity, quantity, revision, obvious damage, corrosion protection, critical dimensions and the documents named in the purchase order. Sampling, gauges and acceptance limits should be agreed in the quality plan. Keep nonconforming items segregated pending disposition.
A custom route is appropriate when the standard interface, geometry, material, finish, marking, inspection or packaging cannot satisfy the application. Provide annual demand and validation expectations so tooling, casting, forging, stamping, machining or fabrication options can be reviewed.
Reference the approved drawing revision and agreed specification, preserve approved samples or inspection records as appropriate, and require notification before material, process, tooling or supplier changes that affect critical characteristics. Reconfirm requirements after a design or application change.
Flanges for industrial distribution, project purchasing and OEM supply, with material, finish and documentation agreed per quotation.
| Product family | Pipe Fittings |
|---|---|
| Supply route | Standard configuration or made to requirement |
| Materials & finish | Malleable iron, ductile iron, gray iron and steel with black, galvanized, painted or project-specified finishes. |
| Applications | Water, HVAC, fire protection, compressed air and compatible industrial utility systems. |
| Documentation | Inspection, traceability and shipment records agreed per quotation |
Define this requirement on the drawing or RFQ so the offered configuration can be checked.
Define this requirement on the drawing or RFQ so the offered configuration can be checked.
Define this requirement on the drawing or RFQ so the offered configuration can be checked.
Define this requirement on the drawing or RFQ so the offered configuration can be checked.
We review geometry, interfaces, service environment and critical characteristics before confirming the supply route.
Casting, forging, machining, stamping, fabrication and finishing are matched to part geometry and repeat volume.
Material checks, dimensional inspection, surface review and agreed records are defined around the quoted part.
Standards note: referenced standards, ratings and certifications vary by product and market. State every required standard in the RFQ; no rating should be inferred from a category image or general description.
Flanges are part of the pipe fittings family. Pipe fittings connect, redirect, branch, reduce or terminate a piping run. Joint method, nominal size, pressure class, media, temperature, material compatibility and applicable standards govern selection.
Provide a drawing, dimensions or reference part number, plus material, finish, quantity, application, destination market and documentation needs.
Malleable iron, ductile iron, gray iron and steel with black, galvanized, painted or project-specified finishes. Availability is confirmed against the exact geometry, quantity and service conditions.
Check joint type and nominal size, pressure and temperature, media compatibility, required dimensional standard and documentation. Final suitability must be verified against the quoted product data and application.
Yes. Drawing-based development can cover geometry, material, machining, finish, marking, packing and inspection requirements, subject to manufacturing review.
Required inspection and shipment documents should be listed in the RFQ. Applicable records are agreed before order confirmation.