304 / 316 Stainless Steel Non-Standard Custom Retaining Ring Flange

304 / 316 Stainless Steel Non-Standard Custom Retaining Ring Flange

This 304/316 stainless steel retaining ring flange adopts anti-loose locking ring structure with precise CNC machining. It is vibration resistant, easy to disassemble and maintains stable sealing. It is non-standard custom flange, manufactured strictly according to customer drawings or samples. Material options include SS304, SS316L, 321, 2205 duplex steel. Widely used in hydraulic systems, vacuum equipment, fluid pipelines, engineering machinery and marine fittings for vibration working conditions. MTC and third-party inspection are available.

Specifications of Custom Stainless Steel Connectors

Manufacturing Capability & Material Range of Custom Stainless Steel Connectors

Key Features

· Full in-house manufacturing with mandrel cold push forming line and complete polishing & finishing equipment

· 100% PMI spectral inspection per batch, full material traceability to original mill heat number

· Dual product lines: industrial heavy-duty pipe fittings + sanitary high-purity hygienic fittings

· Mature special alloy processing technology for severe corrosion & high-temperature working conditions

· Seamless one-piece forming, uniform wall thickness, compatible with orbital welding

· Compliance with full international standards, supported by complete authoritative certifications

· Multiple surface finish options: mechanical polish, mirror polish, electropolishing for sanitary grades

Manufacturing Process

· Raw Tube PMI Spectral & Dimension Inspection

·Precision Cutting & Sizing

· Mandrel Cold Push Forming (one-piece seamless forming)

·End Trimming & Beveling

· Internal & External Polishing (mechanical / mirror / electropolishing)

· Degreasing & High-purity Cleaning (for sanitary grade)

· Semi-finishing Dimensional & Surface Inspection

·Final Quality Control (size, roughness, leakage test)

· Clean Packaging & Delivery

Process Steps

Raw tube PMI and dimension inspection → precision cutting and sizing → mandrel cold push forming → end trimming and beveling → internal and external polishing → degreasing and high-purity cleaning → dimensional and surface inspection → final QC (size, roughness, leakage test) → clean packaging.

Applications

· Dairy: milk, yogurt and cream processing

· Food and beverage: juice, sauce and edible oil

· Brewery: beer and wine fermentation and filling

· Pharmaceutical and biotech: purified water, WFI and liquid medicine

· Cosmetic and personal care: lotion, cream and essence

· Pure water and water treatment: ultrapure water piping

Quality Control

· Material Verification: 100% PMI spectral analysis, chemical composition fully traceable to original mill heat number

· Dimensional Control: High-precision inspection of diameter, wall thickness, bending angle and end flatness

· Surface & Cleanliness: Surface roughness (Ra) test; defect inspection; sanitary grade cleanliness test

· Performance Testing: Sampling pressure & leakage test; ovality & concentricity check

· Third-party Inspection: SGS, BV, TUV witnessed inspection supported

Why Choose Us

· 16+ Years Professional Manufacturer (Founded in 2010, based in Wenzhou, China)

· Full In-house Production Chain: Forming → Polishing → Cleaning → Testing

· Leading Special Alloy Technology: Mature processing of nickel-based, Hastelloy, super austenitic and super duplex steel pipe fittings

· Dual Product System: Industrial heavy-duty pipe fittings + Sanitary high-purity hygienic fittings

· Complete Authoritative Certifications: TS pressure pipe license, ISO 9001/14001/45001, CE-PED, AD2000, EAC

· Full Engineering Support: Working condition analysis, material selection, custom piping solution design

· New Energy Layout: Professional piping solutions for data center liquid cooling, hydrogen energy and energy storage

· Stable & Reliable Delivery: exported to 30+ countries

Available Materials

· Standard Stainless Steel: ASTM A270 / A312 TP304/TP304L, TP316/TP316L, TP321, TP347, 904L

· Super Austenitic & Duplex Steel: Super austenitic steel, SAF 2205, SAF 2507 super duplex steel

· Nickel & Special Alloys: Inconel 600/625/690, Incoloy 800/825/800H, Monel 400, Hastelloy series

· Custom special alloy grades available upon request

Custom Service

· Full custom production per customer drawings, samples or project requirements

· Custom dimensions, bending radius, wall thickness, bevel type and surface finish

· Special material customization: special alloys, sanitary grade materials

· Engineering Support: Working condition analysis, material selection, piping solution design

· Laser marking: logo, part number, batch number, project identification

· Custom export packaging and special protection requirements

· OEM & ODM services

Packaging & Shipping

· Packaging: Export-special wooden cases

· Marking: Custom shipping marks, batch number and material traceability marking

· Shipping: FCL/LCL sea freight, air freight, international express delivery

· Documents: Full set of export documents, MTR reports, certificates and packing lists provided

FAQ:

Q1：What is the difference between a locking ring flange and a standard flange?

：Retaining ring flange comes with locking ring for anti-loose & anti-vibration performance, suitable for vibrating conditions. Ordinary flanges rely only on bolts and may loosen under vibration.

Q2：Can you produce non-standard items according to drawings or samples? Do you have standard sizes?

：This is non-standard custom flange, no fixed standard size. We can produce according to your drawings, samples or dimension data, including special hole layout and custom sealing groove.

Q3：What materials are available? Can you provide material test certificates (MTC)?

：Standard materials: SS304, SS316L. 321, 2205 duplex steel, Hastelloy and other special alloys are optional. MTC material test certificate can be supplied.

Q4：What working conditions and industries does it apply to?

：Suitable for hydraulic oil circuits, vacuum chambers, construction machinery, marine equipment, automation machines and fluid pipelines with vibration and frequent disassembly.

Q5：What surface finishes are available? Is polishing available?

：Standard finish is machined raw finish. Brushed, mirror polishing, electropolishing and passivation for anti-rust are available.

Q6：What is your MOQ? Can you make samples?

：Sample order is acceptable, single piece & small batch custom service supported. Better price for bulk orders, production starts after drawing confirmation.

Q7：Can third-party inspection be arranged?

：Third-party inspection including dimension check, PMI test, UT test is available, we support on-site inspection.