duplex steel slip on flanges

Slip On Flange

Slip on flange are also known as SO flange. It is widely known due to its low material cost and ease of installation. There are many different diameters as well as low-pressure models to choose between. Slip on flange, apart from welding neck flanges, lacks a neck to rest on the pipe, necessitating double welding. A slip-on flange is a type of flange that is designed to slip over the end of a pipe and then be welded in place. It has a slightly larger inside diameter than the outside diameter of the pipe it is intended to be used with. This allows the flange to slide over the pipe, and then the pipe and flange are welded together.


How Does A Slip On Flange Work?


Slip on flange are designed to fit over pipes and are slightly larger inside than pipe. They connect to the pipe via a fillet weld at the top and bottom of the flange. In addition, it is used to insert the pipe into the flange’s inner hole. It is because the flange’s inner diameter is slightly larger than the pipe’s outer diameter. Hence, the pipe and flange can be joined by lap welding at the top and bottom of the flange.

Accordingly, it lacks a weld bevel, hence it is a simple and excellent alternative to a weld neck, allowing the pipe to be adjusted in length relative to the flange’s position. Other than that, the flange’s bore will provide plenty of room for the matching pipe. By that, it provides enough working space for the welder and fabricator to connect.

Besides that, it is very common in low-pressure applications. Most of the flanges would have a hub that looks dimensionally similar to a raised face. If space is tight and also the application enables for a “ring style” slip on, it could be furnished without a hub. Even though the hub style seems to be more usual when referring to a slip on, a ring style slip on without a hub is still considered a slip on flange. In order to have a better connection, the flanges in higher pressure classes are frequently made with the height of a lap joint.

Slip on flange Saliran Industrial Supplies

Types of Slip On Flanges


While slip-on flanges primarily serve the function of connecting pipes in a piping system, they come in various types to suit different needs and applications. Here are some common types of slip-on flanges:

  1. Raised Face Slip-On Flange: This type of slip-on flange has a raised face around the bore hole, which serves as a mating surface for the gasket. The raised face helps create a tighter seal between the flange and the mating component, reducing the risk of leaks.

  2. Flat Face Slip-On Flange: Unlike the raised face flange, a flat face slip-on flange has a flat surface without any raised area around the bore hole. It requires the use of a flat gasket and is typically used in applications where a raised face is not necessary or desired.

  3. Ring Type Joint (RTJ) Slip-On Flange: RTJ slip-on flanges feature a groove machined into the flange face to accommodate a metal ring gasket. These flanges are commonly used in high-pressure and high-temperature applications where a reliable and leak-proof seal is required.

  4. Male and Female Slip-On Flange: In this type, one flange has a raised face while the mating flange has a corresponding depression or female face. The raised face fits into the depression, providing a more secure fit and alignment between the flanges
slip on flanges

Product Tags

Carbon steel flanges Stainless steel flanges Blind flanges Threaded flanges Socket-weld flange Slip-on flange Lap joint flange Weld neck flange Specialty flange Orifice Flange 1/2″ flange 48″ flange 15mm flange 1200 mm flange 150# flange 300# flange 600# flange 900# flange 1500# flange 2500# flange Raised Face RF Ring Type Joint RTJ Flat Face FF Male & Female M&F Tongue Groove T&G SCH 10 flange SCH 20 flange SCH 30 flange SCH 40 flange SCH 60 flange SCH 80 flange SCH 100 flange SCH 120 flange SCH 140 flange SCH 160 flange SCH STD SCH XS SCH XXS SCH 10s SCH 40s SCH 80s ASME B16.1 ASME B16.5 ASME B16.20 ASME B16.21 ASME B16.24 ASME B16.34 ASME B16.36 ASME B16.42 ASME B16.47 MSS SP-6 MSS SP-9 MSS SP-25 MSS SP-44 MSS SP-53 MSS SP-54 MSS SP-55 MSS SP-75 MSS SP-106 API 605 API 6A API 6B flanges supplier malaysia ASME SA/A105N ASTM ASTM A694 F42 ASTM A694 F46 ASTM A694 F52 ASTM A694 F60 ASTM A694 F65 ASTM A694 F70 ASTM A707 L1 ASTM A707 L2 ASTM A707 L3 ASTM A707 L4 ASTM A707 L5 ASTM A707 L6 ASTM A707 L7 ASTM A707 L8 ASME/ASTM SA/A350 LF1 ASME/ASTM SA/A350 LF2 ASME/ASTM SA/A350 LF3 ASME/ASTM SA/A350 LF6 ASME/ASTM SA/A182F2 ASME/ASTM SA/A182F5 ASME/ASTM SA/A182F9 ASME/ASTM SA/A182F11 ASME/ASTM SA/A182F12 ASME/ASTM SA/A182F22


Blind Flange, Slip on Flange, Welding Neck Flange, Socket Weld Flange, Threaded Flange, Lap Joint Flange, Anchor Flange, Orifice Flange

Size Range

1/2" (15mm) - 48" (1200mm)


150#, 300#, 600#, 900#, 1500#, 2500#

Type Available

Raised Face RF, Ring Type Joint RTJ, Flat Face FF, Male & Female M&F, Tongue Groove T&G


SCH 10, SCH 20, SCH 30, SCH 40, SCH 60, SCH 80, SCH 100, SCH 120, SCH 140, SCH 160


SCH 10s, SCH 40s, SCH 80s


ASME B16.1, ASME B16.5, ASME B16.20, ASME B16.21, ASME B16.24,

ASME B16.34, ASME B16.36, ASME B16.42, ASME B16.47

MSS SP-6, MSS SP-9, MSS SP-25, MSS SP-44, MSS SP-53, MSS SP-54, 

MSS SP-55, MSS SP-75, MSS SP-106

API 605, API 6A, API 6B


Carbon Steel


High Yield Carbon Steel

ASTM A694 F42/ 46/ 52/ 60/ 65/ 70

ASTM A707 L1~ L8

Low Temp Carbon Steel

ASME/ASTM SA/A350 LF1/ 2/ 3/ 6

Chrome Moly

ASME/ASTM SA/A182F2, F5 ,F9, F11, F12, F22, F91

Stainless Steel

ASME/ASTM SA/A182F304/304L, 316/316L, 309, 310, 304H, 310H, 317/317L, 321, 321H, 347, 347H, 904L

Duplex/ Super Duplex

UNS S31803, S32205, S32750, S32760
ASME/ASTM SA/A182F51, 53, 55, 60

Nickel Alloy

UNS N02200 (Nickel 200), UNS N02201 (Nickel 201)
UNS N04400 (Monel 400), ), UNS N06600 (Inconel 600)
UNS N06601 (Inconel 601), UNS N06625 (Inconel 625)
UNS N08810 (Incoloy 800H), UNS N08811 (Incoloy 800HT)
UNS N08825 (Inconel 825), UNS N010276 (Hastelloy C276)


HIC, PED 2014/68/EU, NACE MR0175, NORSOK, Weld Overlay available

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