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Slip On Flange

Slip On Flange: Specifications | Materials | Types | Dimensions | Weight Chart | Tolerances | FAQ

ASME B16.5 / B16.47 SORF Flange – Trusted Manufacturer & Global Exporter of Slip On Pipe Flange in Carbon Steel, Stainless Steel, Alloy Steel, Duplex, Super Duplex & High Nickel Alloys. Available in sizes ½” to 24” (B16.5) and 26” to 60” (B16.47) with pressure classes from 150# to 2500#. Widely supplied to USA, UK, Germany, Italy, Australia, Middle East & South America for critical piping applications.

ASME B16.5 / B16.47 SORF Flange Manufacturer

Best Export Prices: sales@midlandforgefittings.com

Midland Forge and Fittings Pvt. Ltd. is a professionally managed organization with decades of expertise in manufacturing and supplying industrial slip on flanges. We are follows a structured approach where every department—from procurement of raw materials to final inspection—is aligned with international quality standards.

With a well-equipped production facility, a skilled workforce, and advanced testing laboratories, We ensures that every product leaving its plant meets the highest benchmarks of precision and durability.

Our policies are built on transparency, quality assurance, and customer satisfaction. We adhere strictly to ASME, ASTM, and other global standards, ensuring that our clients receive products that perform reliably in demanding environments. The company’s working structure emphasizes continuous improvement, efficient supply chain management, and timely delivery. Each project is handled with a customer-first approach, allowing us to provide both standardized and custom-engineered solutions to industries worldwide.

Slip On Flanges are designed to slide over the pipe and are fillet welded both inside and outside to provide strength and prevent leakage. They are manufactured as per ASME B16.5 and B16.47 standards, covering sizes from ½” to 60” and pressure classes 150# to 2500#. With their simple installation, accurate bore alignment, and cost-effective design, Slip On Flanges are widely used in low-pressure piping systems, cooling water lines, and process plants. Midland Forge and Fittings Pvt. Ltd. produces Slip On Flanges in carbon steel, stainless steel, alloy steel, duplex, and high nickel alloys, ensuring compatibility with diverse industrial applications.

ASME B16.5 SORF Flange

Slip On Pipe Flange Specifications

Size Range

15mm ( 1/2" NPS ) up to 600mm ( 24" NPS ), For 2500# in sizes from NPS 1/2 to NPS 12

Pressure Rating - Class

150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS

Marking

Grade / Material, Size (NPS or DN), Pressure Class (PN), Heat No, Standard, Manufacturer’s Name or Trademark

Face Type / Flange Connection Type

Flat Face (FF), Raise Face (RF), Ring Joint (RJT), Tongue and Groove (T&G), Male and Female (M&F)

Flange Form

SORF

Manufacturing Standards

ASTM (A105, A182, A350, A694, B564), ASME/ANSI, MSS-SP-44, API 6A.

Materials

Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Super Duplex, Nickel, Inconel, Incoloy, Hastelloy, Monel, Alloy 20, 254 SMO, Copper Nickel, Titanium.

Test Certificates

EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report, etc

Dimensional Standards

ANSI B16.5, ANSI B16.47, ANSI B16.36, ANSI B16.48, BS 4504, EN1092, UNI 2277/2278, DIN, JIS, SABS1123, GOST-12820

Testing

Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector

Flange Coating/Surface Treatment

Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Production technique

Forged, Heat treated and machined
ASME B16.47, MSS SP - 44 SO Flange

Slip On Flanges – Materials, Grades & Standards

Material Category Standards / Grades (ASTM / ASME) Pressure Class / Size Range Typical Use / Application
Stainless Steel ASTM A182 F304 / F304L / F304H Class 150 – 2500, Size ½”–48” General purpose, corrosion-resistant piping
ASTM A182 F316 / F316L / F316H Class 150 – 2500, Size ½”–48” Chemical, marine, food & pharma industries
ASTM A182 F321 / F321H Class 150 – 1500, Size ½”–24” High temperature, stabilized service
Carbon Steel ASTM A105 (Forged CS) Class 150 – 2500, Size ½”–48” Pressure piping, oil & gas, general industries
ASTM A350 LF2 (Low Temp CS) Class 150 – 1500, Size ½”–24” Cryogenic & low temperature applications
Alloy Steel ASTM A182 F11 / F22 (Cr-Mo) Class 150 – 2500, Size ½”–24” Power plants, refineries, steam pipelines
ASTM A182 F91 Class 150 – 2500, Size ½”–24” High-temperature, power generation
Duplex / Super Duplex ASTM A182 F51 / F53 / F55 / F60 (UNS S31803 / S32205 / S32750 / S32760) Class 150 – 2500, Size ½”–24” Offshore, seawater, high corrosion service
Nickel Alloys ASTM B564 Inconel 600 / 625 / 718 Class 150 – 2500, Size ½”–24” Heat exchangers, chemical, aerospace
ASTM B564 Monel 400 / K500 Class 150 – 2500, Size ½”–24” Marine, seawater handling, pumps
Copper Nickel ASTM B151 / B467 (Cu-Ni 90/10, 70/30) Class 150 – 600, Size ½”–24” Shipbuilding, desalination, seawater systems
Titanium ASTM B381 Gr. 2 / Gr. 5 Class 150 – 600, Size ½”–12” Aerospace, seawater, lightweight piping
Aluminium ASTM B247 6061 / 5083 Class 150 – 300, Size ½”–12” Lightweight, non-corrosive, low-pressure piping
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ANSI/ASME B16.5 Class 150 Slip-On Flange – Dimensions & Sizes in mm

Dimensions of ANSI/ASME B16.5 Slip On Flanges
Nominal Pipe Size Outside Diameter (O) Thickness (T) Raised Face Diameter (R) Length Thru Hub (Y) Hub Diameter (X) Bore (B) Approximate Weight (lbs) Bolt Circle (C) Number of Holes Diameter of Holes
1/2 3.50 0.44 1.38 0.63 1.19 0.88 1 2.38 4 0.63
3/4 3.88 0.50 1.69 0.63 1.50 1.09 2 2.75 4 0.63
1 4.25 0.56 2.00 0.69 1.94 1.36 2 3.13 4 0.63
1 1/4 4.63 0.63 2.50 0.81 2.31 1.70 3 3.50 4 0.63
1 1/2 5.00 0.69 2.88 0.88 2.56 1.95 3 3.88 4 0.63
2 6.00 0.75 3.63 1.00 3.06 2.44 5 4.75 4 0.75
2 1/2 7.00 0.88 4.13 1.13 3.56 2.94 7 5.50 4 0.75
3 7.50 0.94 5.00 1.19 4.25 3.57 8 6.00 4 0.75
3 1/2 8.50 0.94 5.50 1.25 4.81 4.07 11 7.00 8 0.75
4 9.00 0.94 6.19 1.31 5.31 4.57 13 7.50 8 0.75
5 10.00 0.94 7.31 1.44 6.44 5.66 15 8.50 8 0.88
6 11.00 1.00 8.50 1.56 7.56 6.72 19 9.50 8 0.88
8 13.50 1.13 10.63 1.75 9.69 8.72 30 11.75 8 0.88
10 16.00 1.19 12.75 1.94 12.00 10.88 43 14.25 12 1.00
12 19.00 1.25 15.00 2.19 14.38 12.088 64 17.00 12 1.00
14 21.00 1.38 16.25 2.25 15.75 14.14 90 18.75 12 1.13
16 23.50 1.44 18.50 2.50 18.00 16.16 98 21.25 16 1.13
18 25.00 1.56 21.00 2.69 19.88 18.18 130 22.75 16 1.25
20 27.50 1.69 23.00 2.88 22.00 20.20 165 25.00 20 1.25
22 29.50 1.81 25.25 3.13 24.25 22.22 185 27.25 20 1.38
24 32.00 1.88 27.25 3.25 26.13 24.25 220 29.50 20 1.38

ANSI/ASME B16.5 Class 300 Slip-On Flange – Dimensions & Sizes in mm

Nominal Pipe Size Outside Diameter (O) Thickness (T) Raised Face Diameter (R) Length Thru Hub (Y) Hub Diameter (X) Bore (B) Approximate Weight (lbs) Bolt Circle (C) Number of Holes Diameter of Holes
1/2 3.75 0.56 1.38 0.88 1.50 0.88 2 2.63 4 0.63
3/4 4.63 0.63 1.69 1.00 1.88 1.09 3 3.25 4 0.75
1 4.88 0.69 2.00 1.06 2.13 1.36 3 3.50 4 0.75
1 1/4 5.25 0.75 2.50 1.06 2.50 1.70 4 3.88 4 0.75
1 1/2 6.13 0.81 2.88 1.19 2.75 1.95 6 4.50 4 0.88
2 6.50 0.88 3.63 1.31 3.31 2.44 7 5.00 8 0.75
2 1/2 7.50 1.00 4.13 1.50 3.94 2.94 10 5.88 8 0.88
3 8.25 1.13 5.00 1.69 4.63 3.57 13 6.63 8 0.88
3 1/2 9.00 1.19 5.50 1.75 5.25 4.07 17 7.25 8 0.88
4 10.00 1.25 6.19 1.88 5.75 4.57 22 7.88 8 0.88
5 11.00 1.38 7.31 2.00 7.00 5.66 28 9.25 8 0.88
6 12.50 1.44 8.50 2.06 8.13 6.72 39 10.63 12 0.88
8 15.00 1.63 10.63 2.44 10.25 8.72 58 13.00 12 1.00
10 17.50 1.88 12.75 2.62 12.63 10.88 81 15.25 16 1.13
12 20.50 2.00 15.00 2.88 14.75 12.88 115 17.75 16 1.25
14 23.00 2.13 16.25 3.00 16.75 14.14 165 20.25 20 1.25
16 25.50 2.25 18.50 3.25 19.00 16.16 190 22.50 20 1.38
18 28.00 2.38 21.00 3.50 21.00 18.18 250 24.75 24 1.38
20 30.50 2.50 23.00 3.75 23.13 20.20 315 27.00 24 1.38
22 33.00 2.63 25.25 4.00 25.25 22.22 370 29.25 24 1.63
24 36.00 2.75 27.25 4.19 27.63 24.25 475 32.00 24 1.63

ANSI/ASME B16.5 Class 600 Slip-On Flange – Dimensions & Sizes in mm

Nominal Pipe Size Outside Diameter (O) Thickness (T) Raised Face Diameter (R) Length Thru Hub (Y) Hub Diameter (X) Bore (B) Approximate Weight (lbs) Bolt Circle (C) Number of Holes Diameter of Holes
1/2 3.75 0.56 1.38 0.88 1.50 0.88 2 2.63 4 0.63
3/4 4.63 0.63 1.69 1.00 1.88 1.09 3 3.25 4 0.75
1 4.88 0.69 2.00 1.06 2.13 1.36 4 3.50 4 0.75
1 1/4 5.25 0.81 2.50 1.13 2.50 1.70 5 3.88 4 0.75
1 1/2 6.13 0.88 2.88 1.25 2.75 1.95 7 4.50 4 0.88
2 6.50 1.00 3.63 1.44 3.31 2.44 9 5.00 8 0.75
2 1/2 7.50 1.13 4.13 1.63 3.94 2.94 13 5.88 8 0.88
3 8.25 1.25 5.00 1.81 4.63 3.57 16 6.63 8 0.88
3 1/2 9.00 1.38 5.50 1.94 5.25 4.07 21 7.25 8 1.00
4 10.75 1.50 6.19 2.13 6.00

4.57

 37 8.50 8 1.00
5 13.00 1.75 7.31 2.38 7.44 5.66 63 10.50 8 1.13
6 14.00 1.88 8.50 2.63 8.75 6.72 80 11.50 12 1.13
8 16.50 2.19 10.63 3.00 10.75 8.72 115 13.75 12 1.25
10 20.00 2.50 12.75 3.38 13.50 10.88 170 17.00 16 1.38
12 22.00 2.63 15.00 3.63 15.75 12.88 200 19.25 20 1.38
14 23.75 2.75 16.25 3.69 17.00 14.14 230 20.75 20 1.50
16 27.00 3.00 18.50 4.19 19.50 16.16 330 23.75 20 1.63
18 29.25 3.25 21.00 4.63 21.50 18.18 400 25.75 20 1.75
20 32.00 3.50 23.00 5.00 24.00 20.20 510 28.50 24 1.75
22 34.25 3.75 25.25 5.25 26.25 22.22 590 30.63 24 1.88
24 37.00 4.00 27.25 5.50 28.25 24.25 730 33.00 24 2.00

ANSI/ASME B16.5 Class 900 Slip-On Flange – Dimensions & Sizes in mm

Nominal Pipe Size Outside Diameter (O) Thickness (T) Raised Face Diameter (R) Length Thru Hub (Y) Hub Diameter (X) Bore (B) Approximate Weight (lbs) Bolt Circle (C) Number of Holes Diameter of Holes
1/2 4.75 0.88 1.38 1.25 1.50 0.88 4 3.25 4 0.88
3/4 5.13 1.00 1.69 1.38 1.75 1.09 5 3.50 4 0.88
1 5.88 1.13 2.00 1.63 2.06 1.36 8 4.00 4 1.00
1 1/4 6.25 1.13 2.50 1.63 2.50 1.70 9 4.38 4 1.00
1 1/2 7.00 1.25 2.88 1.75 2.75 1.95 12 4.88 4 1.13
2 8.50 1.50 3.63 2.25 4.13 2.44 25 6.50 8 1.00
2 1/2 9.63 1.63 4.13 2.50 4.88 2.94 36 7.50 8 1.13
3 9.50 1.50 5.00 2.13 5.00 3.57 26 7.50 8 1.00
4 11.50 1.75 6.19 2.75 6.25 4.57 53 9.25 8 1.25
5 13.75 2.00 7.31 3.13 7.50 5.66 83 11.00 8 1.38
6 15.00 2.19 8.50 3.38 9.25 6.72 110 12.50 12 1.25
8 18.50 2.50 10.63 4.00 11.75 8.72 170 15.50 12 1.50
10 21.50 2.75 12.75 4.25 14.50 10.88 245 18.50 16 1.50
12 24.00 3.13 15.00 4.63 16.50 12.88 325 21.00 20 1.50
14 25.25 3.38 16.25 5.13 17.75 14.14 400 22.00 20 1.63
16 27.75 3.50 18.50 5.25 20.00 16.16 425 24.25 20 1.75
18 31.00 4.00 21.00 6.00 22.25 18.18 600 27.00 20 2.00
20 33.75 4.25 23.00 6.25 24.50 20.20 730 29.50 20 2.13
24 41.00 5.50 27.25 8.00 29.50 24.25 1400 35.50 20 2.63

ANSI/ASME B16.5 Class 1500 Slip-On Flange – Dimensions & Sizes in mm

Nominal Pipe Size Outside Diameter (O) Thickness (T) Raised Face Diameter (R) Length Thru Hub (Y) Hub Diameter (X) Bore (B) Approximate Weight (lbs) Bolt Circle (C) Number of Holes Diameter of Holes
1/2 4.75 0.88 1.38 1.25 1.50 0.88 4 3.25 4 0.88
3/4 5.13 1.00 1.69 1.38 1.75 1.09 5 3.50 4 0.88
1 5.88 1.13 2.00 1.63 2.06 1.36 8 4.00 4 1.00
1 1/4 6.25 1.13 2.50 1.63 2.50 1.70 9 4.38 4 1.00
1 1/2 7.00 1.25 2.88 1.75 2.75 1.95 12 4.88 4 1.13
2 8.50 1.50 3.63 2.25 4.13 2.44 25 6.50 8 1.00
2 1/2 9.63 1.63 4.13 2.50 4.88 2.94 36 7.50 8 1.13
3 10.50 1.88 5.00 2.88 5.25 3.57 48 8.00 8 1.25
4 12.25 2.13 6.19 3.56 6.38 4.57 73 9.50 8 1.38
5 14.75 2.88 7.31 4.13 7.75 5.66 130 11.50 8 1.63
6 15.50 3.25 8.50 4.69 9.00 6.72 165 12.50 12 1.50
8 19.00 3.63 10.63 5.63 11.50 8.72 260 15.50 12 1.75
10 23.00 4.25 12.75 6.25 14.50 10.88 435 19.00 12 2.00
12 26.50 4.88 15.00 7.13 17.75 12.88 580 22.50 16 2.13

Slip On Piping Flange Weight Chart (lbs) – Pressure Class 150 to 2500

Pipe Size 150# 300# 600# 900# 1500# 2500#
1/2″ 1 1 2 SEE 1500# WEIGHTS 4 7
3/4″ 2 3 3 SEE 1500# WEIGHTS 5 8
1″ 2 3 4 SEE 1500# WEIGHTS 8 11
1 1/2″ 3 6 7 SEE 1500# WEIGHTS 12 22
2″ 5 7 9 SEE 1500# WEIGHTS 25 37
2 1/2″ 7 10 13 SEE 1500# WEIGHTS 36 55
3″ 8 13 16 26 48 83
4″ 13 22 37 53 73 125
5″ 15 28 63 83 130 210
6″ 19 39 80 110 165 325
8″ 30 58 115 170 260 485
10″ 43 81 170 245 435 930
12″ 64 115 200 325 580 1100
14″ 90 165 230 400 NA NA
16″ 98 190 330 425 NA NA
18″ 130 250 400 600 NA NA
20″ 165 315 510 730 NA NA
22″ 185 370 590 NA NA NA
24″ 220 475 730 1400 NA NA

SORF Flange Tolerances as per ANSI / ASME B16.5, 16.47

Parameter Tolerance (B16.5: ≤24″) Tolerance (B16.47: >24″) Remarks
Outside Diameter of Flange (OD) ±1.5 mm (±1/16″) ±3.0 mm (±1/8″) Overall flange OD
Bolt Circle Diameter (K) ±1.5 mm (±1/16″) ±3.0 mm (±1/8″) Bolt pitch circle
Bolt Hole Diameter (L) +1.5 mm / 0 mm (+1/16″ / 0) +1.5 mm / 0 mm (+1/16″ / 0) Hole must not be undersized
Bolt Hole Spacing / Alignment ±1.5 mm (±1/16″) ±3.0 mm (±1/8″) Across bolt circle
Bolt Hole Drilling Angle 90° ± 1° 90° ± 1° To flange face
Flange Thickness (B) +3 mm / –0 mm (+1/8″ / –0) +3 mm / –0 mm (+1/8″ / –0) Minimum thickness maintained
Raised Face Diameter (G) ±0.5 mm (±0.02″) ±0.5 mm (±0.02″) Seating surface
Raised Face Height 2 mm ±0.5 mm (Classes 150–300) 7 mm ±0.5 mm (Classes 400–2500) Same as B16.5 Depends on pressure class
Bore Diameter (ID) +1.0 mm / 0 mm (+0.04″ / 0) +1.0 mm / 0 mm (+0.04″ / 0) Machined bore
Bore Concentricity 1.5 mm (1/16″) max 1.5 mm (1/16″) max With flange OD
Facing Finish (AARH / RMS) 125 – 500 AARH (Ra 3.2–12.5 µm) Same as B16.5 Spiral serrated or concentric grooves
Flatness of Flange Face 0.4 mm (1/64″) 0.8 mm (1/32″) Across raised face / RTJ face
Runout (Hub to Bore) 1.5 mm (1/16″) max 1.5 mm (1/16″) max Axis alignment
What is a Slip On Flange and how does it differ from other flange types?

A Slip On Flange (SO Flange) is a type of pipe flange that is slipped over the pipe and then welded in place. It differs from other flanges as follows:

  1. Design –

    • SO flange has a straight bore with no hub.
    • Weld Neck flange has a long tapered hub that provides reinforcement.

  2. Welding –

    • SO flange requires two fillet welds (inside & outside).
    • Weld Neck flange requires a butt weld.

  3. Strength –

    • SO flanges are suitable for low- to medium-pressure systems.
    • Weld Neck flanges are used for high-pressure and high-stress applications.

  4. Cost & Installation –

    • SO flanges are cheaper and easier to align.
    • Weld Neck flanges are costlier but stronger.

  • Pipe Preparation:

    • The pipe end is cut square and cleaned.

  • Insertion:

    • The pipe is inserted into the bore of the SO flange until it touches the flange face.

  • Welding:

    • One fillet weld is applied on the outside of the pipe–flange joint.
    • A second fillet weld is applied on the inside of the bore.

  • Strength Advantage:

    • Dual welds improve the mechanical strength and leak tightness.

  • Choose Slip On Flange when:

    • Pressure is low to medium.
    • Space for installation is restricted.
    • Cost needs to be minimized.
    • Quick alignment is important.

  • Avoid Slip On Flange when:

    • The system experiences cyclic loading.
    • The service involves very high pressure or temperature.
    • Stress transfer is critical (in that case, Weld Neck is better).
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