Company Introduction

Company Introduction

Mcneil Instruments is a trusted name in the global steel and metal industry, delivering premium-quality products and customized solutions to meet diverse industrial needs. With a strong presence in the UAE and across international markets, we specialize in manufacturing and supplying stainless steel pipes, tubes, flanges, fasteners, and other high-performance metal products.

Our commitment to quality, innovation, and customer satisfaction sets us apart. Backed by years of industry expertise, we adhere to international standards and ensure precision engineering in every product we deliver. At Mcneil Steel & Alloys FZE, we aim to build long-lasting relationships with clients by providing reliable, durable, and cost-effective solutions for industries such as oil & gas, construction, marine, and petrochemicals.

Weld Neck Flange

What is a Weld Neck Flange?

A Weld Neck Flange is a type of flange designed to be welded to a piping system at its neck. This neck is tapered and matches the pipe’s thickness, providing reinforcement and reducing stress concentration at the base of the flange. Weld neck flanges are ideal for high-pressure, high-temperature, or hazardous applications where the strength and reliability of the joint are critical. The welding process used—usually butt welding—ensures a smooth transition from flange to pipe, minimizing turbulence and erosion.

Key Features of Weld Neck Flange:

  • Tapered Hub Design: Provides high strength and stress distribution.
  • Butt Weld Connection: Ensures strong, leak-proof joints.
  • Reinforced Neck: Matches the pipe’s wall thickness, enhancing durability.
  • Smooth Flow Transition: Reduces erosion and pressure drop inside the pipeline.
  • High-Pressure Resistance: Suitable for critical applications in demanding environments.
  • Variety of Materials: Available in carbon steel, stainless steel, alloy steel, etc.
  • Standard Compliance: Manufactured as per ASME, ANSI, DIN, and other standards.

Common Uses of Weld Neck Flange:

  • Petrochemical and Refinery Systems: For high-pressure, high-temperature lines.
  • Oil and Gas Pipelines: Where strong, reliable joints are essential.
  • Power Plants: In steam, water, and gas piping systems.
  • Shipbuilding and Marine Applications: For corrosion resistance and structural integrity.
  • Chemical Processing Plants: Where precise, leak-free connections are critical.
  • High-Pressure HVAC Systems: In industrial heating and cooling setups.
  • Nuclear Applications: Due to their high reliability under extreme conditions.
Flanges Specifications & Standards

Flanges Specifications & Standards

Specifications
International Standards
Size Range½” to 48” (DN15 to DN1200)
Pressure RatingsClass 150, 300, 600, 900, 1500, 2500
TypesWeld Neck, Slip-On, Blind, Threaded, Socket Weld, Lap Joint, Long Weld Neck, Spectacle Blind, Orifice, Ring Type Joint, etc.
Face TypesRaised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Large Male & Female, Tongue & Groove
Material GradesStainless Steel (304, 316, 321, 347), Carbon Steel (A105, A350 LF2), Alloy Steel (F11, F22), Duplex, Super Duplex, Inconel, Monel, Hastelloy
Flange ThicknessAs per ASME B16.5, B16.47, EN1092-1 or client requirement
Drilling TemplatesANSI/ASME, BS, DIN, EN, JIS, GOST, etc.
Surface FinishStock finish (125–250 AARH), Spiral serrated, Smooth finish, or as specified
TestingPMI, UT, RT, Hydro Test, Visual & Dimensional Inspection
Coating (if any)Black Paint, Anti-Rust Oil, Galvanized, FBE, or Custom
ASME B16.5Pipe Flanges and Flanged Fittings (½” to 24”)
ASME B16.47Large Diameter Steel Flanges (26” to 60”) – Series A & B
ASME B16.36Orifice Flanges
ASME B16.48Line Blanks (Spectacle Blinds, Spades & Spacers)
EN 1092-1European Standard for Circular Flanges (PN6 to PN100)
BS 4504British Standard Flanges for Pipes, Valves & Fittings
DIN 2633 / 2576German Industrial Standard Flanges
JIS B2220Japanese Standard Flanges
GOST 12820/12821Russian Flange Standards
MSS SP-44Steel Pipe Line Flanges for High-Pressure Transmission Services
API 605Former Standard for Large Diameter Flanges (merged into ASME B16.47 Series B)
Flange Specifications
StandardsANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc
DimensionsANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc
Sizes1/2″ (15 NB) to 48″ (1200NB)
Class/Pressure150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc
Flange Face TypeFlat Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
FormsSlip on, Socket weld, Forged, Blind, Welding neck, Ring type joint, Spectacle blind, Reducing, Threaded, Tongue & Groove, Long weld neck, Plate flange, ASME B16.5 flange
Range15 NB UP TO 600 NB IN 150 LBS , 300 LBS, 400 LBS , 600 LBS , 900 LBS , 1500 LBS , 2500 LBS / TABLE 2.5 , TABLE 6 , TABLE 10, TABLE 16,TABLE 25 , TABLE 40, TABLE 64, TABLE 160, TABLE 320, TABLE 400
FormSlip On , Socket Weld , Blind , Lapped , Screwed , Weld Neck , Reducing , Spectacle ,Slip On Boss , Plate , Plate Blank , Screwed Boss.
Stainless SteelASTM / ASME SA 182 F 304 , 304L , 304H, 309H, 310H , 316 , 316H , 316L , 316 LN , 317 , 317L , 321 , 321H , 347H
Duplex SteelASTM / ASME SA 182 F 44 , F 45 , F51 , F 53 , F 55 , F 60 , F 61
RangeSame as Stainless
FormSame as Stainless
Carbon SteelASTM / ASME A 105 , ASTM / ASME A 350 LF 2
Alloy SteelASTM / ASME A 182 GR F 5, F 9 , F 11 , F 12 , F 22 , F 91
RangeSame as Stainless
FormSame as Stainless
Nickel AlloyASTM / ASME SB 564 UNS 2200, 4400, 8825, 6600, 6601, 6625, 10276 etc
Copper AlloyASTM / ASME SB 61, SB 62, SB 151, SB 152 (various UNS/CU-NI grades)
GradesHastelloy C-22, C-276, C-2000
Size1/2″NB to 12″NB
StandardASTM, ASME, API, AISI, BS, ANSI, DIN, JIS, MSSP, NACE
TypesSocket Weld, Slip On, Blind, Lapped, Screwed, Weld Neck, Long Weld Neck, Reducing, Spectacle, Ring Joint
FeaturesDurability, Corrosion resistance, Dimensional accuracy, High strength, Excellent finish
GradesInconel 600, 601, 625, 625LCF, 686, 718, 800, 825, X-750
Size1/2 inch – 48 inch (15mm – 1200mm)
StandardANSI/ASME B16.5, ANSI B16.47 API, DIN, JIS, BS
TypesSame as Hastelloy
FeaturesSame as Hastelloy
GradesIncoloy 800, 825, 925, A-286, DS
Flanges GradeASTM A 182 F 304/L; 316/L; 317/L; 309; 310; 321; 347; 904L
TypeSORF, BLRF, WNRF, SOLJ
Class50 To 3000
RangeDN15 to DN1800 in multiple pressure classes
FeaturesSame as Inconel
GradesMonel 400, Monel K500
Range1/2″ NB to 60″ NB
TypesSame as above
FeaturesDurability, Corrosion resistance, Dimensional accuracy, High strength, Chemical resistance, Excellent finish
MaterialTitanium
GradeGr2, Gr5, Gr7, Gr9
StandardsDIN, ASTM, BS
ApplicationBicycles, Motors, Chemicals
StrengthsSuperior Quality, Fast delivery, Competitive pricing, Humanized after-sales
FeaturesLow density, Rustless, Good antiwear, High strength
SizeAs per customer requirements
Most Selling Types Of Flanges

Most Selling Types Of Flanges

Weld Neck Flange Weld Neck Flange Slip-On Flange Slip-On Flange Blind Flange Blind Flange Threaded Flange Threaded Flange Socket Weld Flange Socket Weld Flange Lap Joint Flange Lap Joint Flange Long Weld Neck Flange Long Weld Neck Flange Expander Flange Expander Flange Orifice Flange Orifice Flange Spade and Ring Spacer Flange Spade and Ring Spacer Flange Spectacle Blind Flange Spectacle Blind Flange High Hub Flange High Hub Flange Flat Flange Flat Flange Loose Flange Loose Flange Ring Type Joint Flange Ring Type Joint Flange SORF Flange SORF Flange BLRF Flange BLRF Flange Groove & Tongue Flange Groove & Tongue Flange
Weld Neck Flange Export Countries

Weld Neck Flange Manufacturer, Supplier, Exporter in Countries

Country Country Country Country
Weld Neck Flange Exporter in Kuwait Weld Neck Flange Exporter in India Weld Neck Flange Exporter in Oman Weld Neck Flange Exporter in Iran
Weld Neck Flange Exporter in Qatar Weld Neck Flange Exporter in China Weld Neck Flange Exporter in UAE Weld Neck Flange Exporter in Africa
Weld Neck Flange Exporter in Turkey Weld Neck Flange Exporter in Mexico Weld Neck Flange Exporter in Canada Weld Neck Flange Exporter in Malaysia
Weld Neck Flange Exporter in Saudi Arabia Weld Neck Flange Exporter in Brazil Weld Neck Flange Exporter in USA Weld Neck Flange Exporter in Sri Lanka
Weld Neck Flange Exporter in Australia Weld Neck Flange Exporter in Nigeria Weld Neck Flange Exporter in 85+ countries
Weld Neck Flange Export Countries

Manufacturer & Exporter of Weld Neck Flange in the Following Countries

Country Country Country Country Country
Saudi Arabia Kazakhstan Zimbabwe Netherlands India
Afghanistan Belgium UAE Israel Europe
New Zealand Mexico Canada Venezuela United Kingdom
United States South Africa Malaysia Poland Germany
Singapore Sri Lanka Australia Brazil Ireland