Slip On Flange

Stainless Steel Slip on flange (SOF) are made to slip over the outside of pipe or a long-tangent elbows, swages and reducers. As known the flange has unsatisfactory resistance to vibration and shock but it is uncomplicated to align . The strength of slip on flanges is about one third that of a weld neck flange when under internal pressure, hence they exemplary for low pressure application. It  has a flat as well as raised face (SORF Flange).  As the pipe slips into the flange prior to welding hence the ANSI B16.5 Slip on flange has a low hub. The abbreviation of slip on is SO Flange which have implementation in industries that uses pipe and fittings.

It is welded on both in and outside to provide enough strength and avoid leakage. Slip on flange have larger O.D. than pipe becuase they are bored. Due to their low inuagural they are mostly selected over welding neck flanges. Because of further welding  the final intallation charge is possibly not much below than that the weld neck flange. For quickly obtaining a nominal pipe size the slip-on flange can be custom made or even machined..

What are the use & advantages of a slip on flanges?

  • The installation charged for slip-on flange is low than any other.
  • It quickly ensures the correctness of the cut pipe.
  • For easy alignment SORF Flange sre of better use.
  • The hub of Slip on flange is low  hence the pipe does not slips into the flange before connecting.
  • To furnish adequate strength it is welded inside as well as outside.
  • There is prevention from leakage because of this flange.
  • Economical and time saving  are the advantages of this device.
  • In highly volatil areas one can use this flange to prevent explosion.
  • They  avoid the coincidental opening of a valve

ASME / ANSI B16.5 Slip on Flange Manufacturer In India

Devdeep Steel Alloys is a specialised manufacturers of high quality pipe Slip on flange available in standards ANSI B16.5 Flanges, ANSI B16.47 Series A & B, DIN Flange, JIS B2220 flange, MSS SP44 Flange, EN1092-1 FLANGES, API 605, AWWA C207 Flange, industrial pipe flanges in India. We quickly provide the standard size of stainless steel flanges and carbon steel flanges because of ready stock facility. ANSI B16.5 Slip on Steel flange have generally pressure ratings as follows. 150 lb, 300 lb, 400 lb, 600 lb, 900 lb, 1500 lb, 2500 lb. We also manufacture plate Slip on flanges from special nickel alloy steel grades. The material is provided within few working days in time programs.

Our Slip on pipe flange are available with face type of Flat Face (SOFF), Raised Face (SORF) & Ring Type Joint (SORTJ) and also with female threads. Steel Slip on flanges are also available with or without hub as per the requirement of customer. Devdeep Steel Alloys offer steel plate flanges to all companies coupled with various industries. For instance petrochemical plants, paper mills, power generation, pharmaceutical plants, oil refineries, shipbuilding, turnkey projects and waste water treatment plants among others.

Slip on pipe flanges are comparatively used where high & huge pressure applications are needed. To allow an easy access, in a piping system you should use Slip on steel flanges only one time when it is closed. At the present time we design SS Slip on flange with advance technology made from raw material of high quality, that have low maintenance. Moreover the products are available at very fair & competitive price.

Types Of Pipe Flange

Slip on flange, weld neck flange, threaded flange, socket weld flange, blind flange, lap joint flange are the most common types of steel flanges. The special flanges such as orifice flanges, long weld neck flanges, spectacle flange to cater all industrial needs. In fact steel pipe flange are manufactured according to international quality standards which are available in various material, sizes & dimensions. In hazardous welding areas where the situation is extraordinary and areas are highly volatile. For that reason one can use our pipe flanges as an advantage in working those circumstances. Thereupon we timely deliver the products within stipulated time frame. High durability, corrosion resistance technique as well as dimensional accuracy are the advantages of our products. Our range of flanges consequently got approval in the global and the domestic markets.

Carbon Steel / Stainless Steel Slip on Forged Flanges Production Range

Size: 1/2″ (15 NB) to 48″ (1200NB)

Standards: ANSI B16.5 Flanges, ANSI B16.47 Series A & B, DIN Flange, JIS B2220 flange, MSS SP44 Flange, EN1092-1 FLANGES, ASA, API 605, AWWA C207 Flange.

Pressure Ratings: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500. PN6, PN10, PN16, PN25, PN40, PN64 etc.

Carbon Steel Slip On Flanges: A350 LF1, LF2, LF3 CL1/CL2.

A694 F42, F46, F48, F50, F52, F56, F60, F65, F70, A516.60, 65, 70. Steel RST37.2, C22.8

Stainless Steel Slip On Flanges: ASTM A182 F202, F304/304L/304H, F316/316L, F316H, F316TI, F310, F321, F904L.

Alloy Steel Slip On Flanges: ASTM A182 F1, F5, F9, F11, F22, F91.

Nickel Alloy Slip On Flanges:Alloy C22, C276, A400, A600, A625, A800 & A825 / ASTM B462 Alloy 20.

Flange Face Type: Flat Face Flanges (FF), Raised Face Flange (RF), Groove and Tongue, Ring Type Joint (RTJ)

Coating/Surface Treatment: Oil Black Paint, Anti-rust Paint, Yellow Transparent, Cold and Hot Dip Galvanised, Zinc Plated.

Value Added Services: Customised Flanges & CNC Machining.


Ansi B16.5 slip on flange dimension

OUTSIDE DIAMETER  ≤ 24 = 1.6 mm > 24 = ± 3.2 mm
INSIDE DIAMETER≤ 10 = ± 0.8 mm ≥ 12 = + 1.6 mm / – 0 mm
OUTSIDE DIAMETER OF HUB ≤ 12 = + 2.4 mm / – 1.6 mm ≥ 14 = ± 3.2 mm
DIAMETER OF COUNTERBORE Same as for Inside Diameter
DRILLING  Bolt Circle = 1.6 mm Bolt Hole Spacing = ± 0.8 mm
ECCENTRICITY OF BOLT CIRCLE ≤ 2½ = 0.8 mm max. ≥ 3 = 1.6 mm max.
THICKNESS ≤ 18 = + 3.2 mm / – 0 ≥ 20 = + 4.8 mm / – 0
LENGTH THRU HUB ≤ 18 = + 3.2 mm / – 0.8 mm ≥ 20 = + 4.8 mm / – 1.6 mm

DIAMETER OF CONTACT FACE 1.6 mm Raised Face = ± 0.8 mm 6.35 mm Raised Face, Tongue & Groove / Male-Female = ± 0.4 mm


  • Slip On Raised Face Flange
    • ANSI Class 75, Industry Standard (in)
    • ANSI Class 150, B16.5 (in)
    • ANSI Class 300, B16.5 (in)
    • ANSI Class 400, B16.5 (in)
    • ANSI Class 600, B16.5 (in)
    • ANSI Class 900, B16.5 (in)
    • ANSI Class 1500, B16.5 (in)
    • ANSI Class 2500, B16.5 (in)
  • Slip on Ring Type Joint Flanges
    • ANSI Class 150, B16.5 RTJ (in)
    • ANSI Class 300, B16.5 RTJ (in)
    • ANSI Class 400, B16.5 RTJ (in)
    • ANSI Class 600, B16.5 RTJ (in)
    • ANSI Class 900, B16.5 RTJ (in)
    • ANSI Class 1500, B16.5 RTJ (in)
    • ANSI Class 2500, B16.5 RTJ (in)

Marking & Packaging

Steel Flange Marking & Packaging

We deliver Slip on flange from our warehouse to your workplace with complete protection in the meantime. The unforeseen accidents can damage the product during delivery, therefore we pack them in wooden pallet. In case of exports, we use wooden cases for standard export packaging. We take great care of product during transportation and operation. To clarify details, we clearly label the products regarding quality, quantity and product I.D outside the package. To prevent damage during transportation, Devdeep cover the product in plastic bags and close them in cartoon boxes. Furthermore we also provide seaworthy wooden cases plywood boxes according to the requirement of customer.

The Slip on, SO Flanges contains marking such as Lot no, Steel Grade, outside diameter, Size & dimension, Wall thickness including Devdeep Steel Alloys Brand Mark. For customised marking you can contact us. We guarantee the fastest delivery for products in country, because of well equipped storage and warehouse facilities.

Quality Assurance & Test Certificates:

We undertake strict inspection at each stage in the process of production of Slip on flanges. At Devdeep Steel Alloys from purchasing of material to dispatch the product contains no defect. Our team member frequently examine the flange to confirm the international quality, codes and standards. ASTM, ASME (American), MSS, DIN German), EN (European), JIS (Japanese). To confirm the quality of products, to witness the dimension & material reports. We can call a certified Third Party Inspection agencies upon request. At Devdeep Steel Alloys, the clients can nominate Third Party Inspection for offered products. We can also arrange the TPI by World reputed Agencies like LLOYDS, DNV, ICB, Bureau Veritas and many other.

We use high quality raw material for manufacturing steel Slip on flange tested from approved NABL Lab. Other testing reports such as Non Destructive or destructive and Hydro Testing Reports can be provided upon request of customer,

Manufacturer Test Certificate (MTC) as per EN 10204 / 3.1B will be provided along with the ANSI B16.5 Slip on Flanges. In addition 100% Radiography Test Report, Raw Materials Certificate & Third Party Inspection Report available on demand.