NXF UNS S31603 316/0Cr17Ni12Mo2/1.4401 Instrumentation Fittings 1/2" Stainless Steel Double Ferrule Straight Union Tube Fitting

2026-07-29 17:28 NXF GROUP
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Product Description
316L Introduce
Grade 316 is the standard molybdenum-bearing grade, second in importance to 304 amongst the austenitic stainless steels. The molybdenum gives 316 better overall corrosion resistant properties than Grade 304, particularly higher resistance to pitting and crevice corrosion in chloride environments.
Grade 316L, the low carbon version of 316 and is immune from sensitization (grain boundary carbide precipitation). Thus it is extensively used in heavy gauge welded components (over about 6mm). There is commonly no appreciable price difference between 316 and 316L stainless steel.
The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.
Compared to chromium-nickel austenitic stainless steels, 316L stainless steel offers higher creep, stress to rupture and tensile strength at elevated temperatures.

316L Double Ferrule Straight Union Tube Fitting Introduce

Stainless steel double ferrule straight union is a core connecting component for instrument, hydraulic and gas pipeline systems. Mainly made of SS304 and SS316 stainless steel, it matches precision seamless tubes and is widely used in chemical, new energy, laboratory, oil & gas high-pressure transmission fields. Adopting double ferrule sealing structure, the front ferrule clamps the tube wall firmly while the rear ferrule fills gaps for double locking. No welding or PTFE tape is required, enabling easy disassembly and assembly, excellent pressure resistance and long-lasting leak-tight performance.The whole fitting is CNC integrated turned with regular hexagonal nuts and mirror polished smooth inner & outer surfaces. It resists acid, alkali and seawater corrosion, working stably under wide temperature range from -200℃ to 450℃ and withstanding high pressure impact. Every batch undergoes air tightness and burst pressure sampling tests before delivery. We can supply material spectrum certificates and pressure test reports to meet customs clearance and equipment inspection standards worldwide.Metric and imperial sizes from OD 3mm to 25mm are customizable for various precision tubes. Mass standardized production ensures stable lead time, and moisture-proof individual packaging avoids scratches during transit. With reliable sealing and anti-corrosion performance, our double ferrule straight unions are exported to Europe, America and Southeast Asia, serving as standard preferred fittings for high-pressure fluid and precision instrument pipeline assembly.
316L Double Ferrule Straight Union Tube Fitting Drawing
316L Chemical Composition and Mechanical Properties
Factory and Product Pictures
316L Double Ferrule Straight Union Tube Fitting Product Pictures
316L PMI spectral testing proves
Video of a customer visiting us


Product processing

316L Double Ferrule Straight Union Tube Fitting Product Processing

1.Raw Material Inspection & CuttingQualified SS304/SS316 stainless steel bars are adopted. Spectroscopic test is carried out for incoming materials to verify mechanical and anti-corrosion performance. Bars are precisely cut into blanks with tight length tolerance.

2.CNC Integrated TurningCNC lathes machine the fitting body in one piece, processing inner bore, sealing cones and hexagonal positions accurately to guarantee high coaxiality and eliminate leakage risks under high pressure.

3.Precision Machining of Double FerrulesFront and back ferrules are separately turned with precise cutting edge angle, which can tightly bite tube walls to form double sealing structure after assembly.

4.Mirror Polishing & PassivationMulti-step polishing removes burrs and tool marks. Passivation treatment forms a protective film to strengthen acid, alkali and seawater resistance for harsh working environments.

5.Batch Pressure & Air Tightness TestRandom sampling for air tightness and burst pressure test simulates real pipeline working conditions to filter out defective products and ensure reliable sealing performance.

6.Final Dimension Inspection & PackagingAll sizes and appearance are double checked. Qualified fittings are packed with moisture-proof bags to prevent scratches during transportation, complete with material test certificates for shipment.

Our NXF GROUP Advantage As Follow:
1.Our NXF GROUP have our own factory, and we can control the cost by producing by ourselves. We have a great advantage in price and can give you the lowest price based on best quality. 2.Our NXF GROUP can strictly control the quality. We have production, quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing. 3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.4.Our NXF GROUP have excellent quality certificate system and trademark certificate 5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services. 6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing youwith a one-stop service.
Packing & Delivery
Company Profile
316L Double Ferrule Straight Union Tube Fitting Certification
FAQ

1. who are we?We are based in Jiangsu, China, start from 2021,sell to South Asia(30.00%),Eastern Asia(10.00%),Mid East(10.00%),EasternEurope(10.00%),South America(10.00%),Domestic Market(5.00%),North America(5.00%),Northern Europe(5.00%),CentralAmerica(5.00%),Africa(5.00%),Southeast Asia(5.00%). There are total about 101-200 people in our office.

2. how can we guarantee quality?Always a pre-production sample before mass production;Always final Inspection before shipment;

3.what can you buy from us?Pipe,Flange,Steel plate,Pipe fittings,Alloy products

4. why should you buy from us not from other suppliers?Our advantage:3S Service (Small Quantity/Short Time/Special Material) We have our own factories, quality can be controlledseriously. We Specialize in manufacturing about 21 years. We have professional testing department and testing equipment.

5. what services can we provide?Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA;Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;Accepted Payment Type: T/T,L/C,D/P D/A;Language Spoken:English,Chinese




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