Pressure Class
150#Class 150 (20 bar nominal)
300#Class 300 (50 bar nominal)
600#Class 600 (100 bar nominal)
900# - 2500#High Pressure Critical Service
Product page
SKYLAND
ASME B16.5 Slip On Raised Face Flanges (SORF)
Skyland ASME B16.5 Slip On Raised Face (SORF) Flanges are engineered for rapid alignment and reliable low-to-medium pressure piping assemblies. The pipe slides directly into the flange bore and is secured via two fillet welds (one on the outside hub and one inside the flange bore), preventing fluid entrapment and delivering cost-effective piping connectivity across oil & gas, petrochemical, and HVAC water systems.
Manufactured strictly to ASME / ANSI B16.5, DIN 2576 / EN 1092-1 Type 01, and BS 4504
Pressure Classes: Class 150, 300, 400, 600, 900, 1500, and 2500 LBS (PN6 to PN400)
Nominal Pipe Sizes: 1/2" to 48" (DN 15 to DN 1200)
Raised Face (RF) with standard spiral or concentric phonographic serrations (125-250 Ra)
Ready for quotationShare your range, connection and case requirement.
Talk to ATHStandardASME / ANSI B16.5, EN 1092-1, DIN 2576, BS 4504
Pressure ClassClass 150#, 300#, 600#, 900#, 1500#, 2500#
Size Range1/2" to 48" (DN 15 to DN 1200)
FacingRaised Face (RF) standard (Flat Face FF available)
MaterialsASTM A105N, A350 LF2, A182 F304L/F316L, Duplex F51, Inconel
CertificationsEN 10204 3.1, NACE MR0175, PED 2014/68/EU, ISO 9001:2015
Technical Selection Guide
ASME B16.5 Slip On Flange Specifications
Select nominal pipe size, pressure class, facing type, and material alloy.
StandardASME B16.5
Classes150# to 2500#
Sizes1/2" to 48"
FacingRF / FF / RTJ
Part Number Example
SKL-SO-040-150RF-A105N
SKLManufacturerSkyland Metal & Alloys
SOFlange TypeSlip On (SORF)
040Size4" NPS (DN 100)
150RFClass & FaceClass 150 Raised Face
A105NMaterialASTM A105 Normalized Carbon Steel
Technical specifications
StandardASME B16.5 / MSS SP-44
OriginMumbai & Gujarat, India
Operational Notes
Internal fillet weld must be set back from the flange face by at least pipe wall thickness plus 3 mm to protect the gasket surface.
Product Engineering & Overview
Slip On Flanges feature an inner diameter slightly larger than the outside diameter of the matching pipe. Double fillet welding (internal and external) provides structural rigidity and prevents leakage at joint interfaces.
Ideal for applications where space restrictions or fabrication speed dictate slip-on installation over weld neck configurations.
Ordering & Dimensional Data
Facing FinishSerrated concentric or spiral grooves 125-250 AARH / Ra per ASME B16.5
Hub DesignForged tapered hub for enhanced structural strength under thermal loads
Bore Tolerance+0.03" / -0.00" on sizes up to 10", +0.06" / -0.00" on 12" and larger
Testing100% Dimensional inspection, PMI, Ultrasonic, and Magnetic Particle Testing