SPFL® INDUSTRIAL FLANGE RANGE
Slip-On Flange
Slip-on (SO) flange with a bore that fits over the pipe; the welding arrangement must follow the approved piping design.
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Stainless Steel & High-Nickel Alloy Slip-On Flange Grades
Specify SS 304, SS 316, SS 310, SS 904L, HASTELLOY, Alloy 20, MONEL or INCONEL in your slip-on flange enquiry. Include the exact grade or UNS designation, flange size, pressure class, facing, quantity and required material test certificate.
| Material category | Grade / alloy | Technical designation to confirm |
|---|---|---|
| Stainless steel | SS 304 / 304L | For forged flange enquiries: ASTM A182 F304 / F304L where required by the project. State the exact grade, not just SS. |
| Stainless steel | SS 316 / 316L | For forged flange enquiries: ASTM A182 F316 / F316L where required. 316 and 316L are separate designations. |
| Heat-resistant stainless steel | SS 310 / 310S | Specify 310 or 310S separately. Confirm the applicable product specification, heat treatment and design temperature; no automatic substitution. |
| High-alloy austenitic stainless steel | SS 904L | 904L is stainless steel with high nickel and molybdenum content, not an INCONEL or MONEL grade. Specify the applicable product standard and certificate requirement. |
| Nickel-alloy family | HASTELLOY® | State the exact alloy: e.g. C-276 (UNS N10276) or C-22 (UNS N06022). Family name alone is insufficient; examples are not a stock declaration. |
| High-nickel austenitic alloy | Alloy 20 (UNS N08020) | Specify Alloy 20 and the applicable product form/specification. Do not treat it as equivalent to 904L or 316L. |
| Nickel-copper alloy family | MONEL® | State the exact alloy, e.g. MONEL 400 (UNS N04400), with product specification. Other MONEL grades must be identified separately. |
| Nickel-alloy family | INCONEL® | State the exact alloy, e.g. INCONEL 600 (UNS N06600) or INCONEL 625 (UNS N06625). These are different grades, not interchangeable. |
Supply availability, manufacturing route, applicable material specification and suitability for the selected flange configuration are confirmed during technical review. This table is not a claim that every grade is stocked in every flange type. Dimensional standards such as ASME B16.5 do not by themselves define material grade or approve service conditions.
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Material naming references
904L stainless steel · HASTELLOY alloy designations · Alloy 20 · MONEL alloy designations · INCONEL alloy designations. External references establish naming only, not Shri Parvati inventory, affiliation or certification.
Quick Specifications
Use this specification checklist for your enquiry. It is not a declaration of stocked grades, available sizes or certified service suitability.
| Parameter | Required specification |
|---|---|
| Product / designation | Slip-On Flange |
| Dimensional reference | ASME B16.5; state the required edition and approved drawing. This is a technical reference, not a blanket compliance claim. |
| Material / grade | For forged-material enquiries, state the exact ASTM A182 stainless/alloy designation or ASTM A105 carbon-steel requirement where applicable. Material and availability require confirmation. |
| Size / bore | Specify NPS or DN plus actual bore, pipe outside diameter and wall or schedule where relevant. Confirm quoted dimensions before ordering. |
| Pressure class / rating | State the required flange class and design pressure/temperature. Class numbers are not a universal pressure rating in psi. |
| Facing / gasket | Specify RF, FF, RTJ or other engineered facing only as applicable to the selected configuration. |
| Critical dimensions | Pipe outside diameter, flange bore clearance and fillet-weld arrangement |
| Inspection / documents | State required material certificate, dimensional inspection, marking and any project-specific testing. Document availability is confirmed with the quotation. |
| Quantity / supply scope | Specify pieces or sets, mating components, delivery destination and requested lead time. |
Dimensional Reference Table – mm
Class 150 common flange drilling reference. Outside diameter, bolt-hole diameter and bolt circle diameter are shown in millimetres.
| NPS (nominal label) | Outside diameter O (mm) | Bolt holes: count x diameter (mm) | Bolt circle diameter (mm) |
|---|---|---|---|
| 1/2 | 88.90 | 4 x 15.75 | 60.45 |
| 3/4 | 98.55 | 4 x 15.75 | 69.85 |
| 1 | 107.95 | 4 x 15.75 | 79.25 |
| 1-1/4 | 117.35 | 4 x 15.75 | 88.90 |
| 1-1/2 | 127.00 | 4 x 15.75 | 98.55 |
| 2 | 152.40 | 4 x 19.05 | 120.65 |
| 2-1/2 | 177.80 | 4 x 19.05 | 139.70 |
| 3 | 190.50 | 4 x 19.05 | 152.40 |
| 3-1/2 | 215.90 | 8 x 19.05 | 177.80 |
| 4 | 228.60 | 8 x 19.05 | 190.50 |
| 5 | 254.00 | 8 x 22.35 | 215.90 |
| 6 | 279.40 | 8 x 22.35 | 241.30 |
| 8 | 342.90 | 8 x 22.35 | 298.45 |
| 10 | 406.40 | 12 x 25.40 | 361.95 |
| 12 | 482.60 | 12 x 25.40 | 431.80 |
| 14 | 533.40 | 12 x 28.45 | 476.25 |
| 16 | 596.90 | 16 x 28.45 | 539.75 |
| 18 | 635.00 | 16 x 31.75 | 577.85 |
| 20 | 698.50 | 20 x 31.75 | 635.00 |
| 22 | 749.30 | 20 x 35.05 | 692.15 |
| 24 | 812.80 | 20 x 35.05 | 749.30 |
Dimensions are in mm. NPS denotes nominal pipe size. Bolt-hole entries show the hole count followed by the hole diameter. Confirm final dimensions against the applicable standard and approved drawing.
This is not a stocked-size list. Bore, hub, thickness, thread, socket and facing are configuration-specific. Confirm the required standard edition and approved drawing before procurement.
Technical Selection Notes
Pipe outside diameter, flange bore clearance and fillet-weld arrangement are important to slip-on flange selection. A nominal size and material name alone do not establish mating compatibility. Compare the complete connection details with the approved piping or equipment drawing.
For forged-material enquiries, state the exact ASTM A182 stainless/alloy designation or ASTM A105 carbon-steel requirement where applicable. Material and availability require confirmation. When enquiring about a stainless-steel grade, use its complete product-standard designation rather than only a commercial label such as “SS 316”. For example, a forged slip-on flange enquiry may specify ASTM A182 F304, F304L, F316 or F316L where required by the project; ASTM A105 is a separate carbon-steel forging specification. These are RFQ designation examples, not a confirmed supply range. Any grade substitution needs project approval.
Application Areas
Process utility piping, water distribution and equipment connections. These are application contexts, not an approval for every pressure, temperature, fluid or installation.
For pharma, dairy or food-related projects, distinguish utility piping from product-contact hygienic connections. Specify surface finish, cleaning requirements and applicable hygienic design; an ordinary industrial flange is not automatically a sanitary fitting.
Request a Technical Quotation
Send the slip-on flange requirement, quantity, material specification, nominal size, class or design rating, facing, service conditions, pipe outside diameter, flange bore clearance and fillet-weld arrangement, and delivery location. Supply scope and lead time are confirmed in the quotation.
For a ASME B16.5 slip-on flange supplier enquiry, attach your purchase specification or drawing. Ask for the exact manufacturer identity, material traceability and inspection scope required by your project. We will review the requested configuration before confirming supply.
Send Slip-On Flange Requirement
Download Flange Dimensional Reference PDF (114 pages). This is a general reference catalogue, not an approved project drawing or a declaration of available grades and sizes. Confirm the specified standard edition and dimensions before ordering. Technical RFQ Checklist.
Frequently Asked Questions
Does a slip-on flange use the same bore specification as a weld-neck flange?
No. Slip-on bore fit is selected for the pipe outside diameter; a weld-neck bore is matched to the pipe wall or schedule. Specify the connection type, not just the nominal size.
What should I send to request a quotation?
Send the slip-on flange requirement, quantity, material specification, nominal size, class or design rating, facing, service conditions, pipe outside diameter, flange bore clearance and fillet-weld arrangement, and delivery location. Supply scope and lead time are confirmed in the quotation.
Related Product Categories
Flanges · Pipe Fittings · Bolts · Grades & Standards
Related categories are enquiry suggestions; gasket, fastener and mating-part compatibility must be checked against the complete joint design.