Complete Guide to Flange Types: Weld Neck, Slip-On, Blind, Socket Weld, Threaded

Complete Guide to Flange Types

Published: April 10, 2026 | Category: Products

1. Weld Neck Flanges (WN)

Features: Tapered hub, butt-welded
Advantages: Superior strength, high pressure/temp
Applications: Oil & gas, power plants, refineries

2. Slip-On Flanges (SO)

Features: Flat hub, slides over pipe
Advantages: Lower cost, easy alignment
Applications: Water treatment, low-pressure

3. Blind Flanges (BL)

Features: Solid face, no bore
Advantages: Positive shutoff
Applications: Pipeline caps, vessel openings

4. Socket Weld Flanges (SW)

Features: Recessed socket
Advantages: Small-bore (<2")
Applications: Instrument tubing, hydraulics

5. Threaded Flanges (TH)

Features: Internal threads, no welding
Advantages: Spark-free
Applications: Explosive environments

6. Lap Joint Flanges (LJ)

Features: Used with stub ends
Advantages: Easy disassembly
Applications: Large-diameter, low-pressure

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