Size Selection
3" x 2"3" Flange x 2" Bore
4" x 2"4" Flange x 2" Bore
6" x 3"6" Flange x 3" Bore
6" x 4"6" Flange x 4" Bore
Product page
SKYLAND
ASME B16.5 Reducing Pipe Flanges
Skyland Reducing Flanges are designed to connect two pipes of different nominal diameters where space limitations prevent using a separate reducer and standard flange. The flange has an outer bolt circle diameter corresponding to the larger pipe size, with a smaller central bore (threaded, socket weld, or weld neck) corresponding to the smaller connected pipe.
Manufactured to ASME / ANSI B16.5 standards
Pressure Classes: Class 150, 300, 600, 900, 1500, and 2500 LBS
Outer Flange Sizes: 2" to 24" with reduced bore sizes down to 1/2" NPS
Bore connection styles: Threaded (NPT), Socket Weld, or Slip-on reducing styles
Ready for quotationShare your range, connection and case requirement.
Talk to ATHStandardASME / ANSI B16.5
Pressure ClassClass 150# to 2500#
Outer Flange Size2" to 24" (DN 50 to DN 600)
Reduced Bore Size1/2" to 20" (DN 15 to DN 500)
MaterialsA105N, A350 LF2, A182 F316L, Duplex F51
CertificationsEN 10204 3.1, PED 2014/68/EU, ISO 9001:2015
Compact Transition
ASME B16.5 Reducing Flange Specifications
Select outer flange size, reduced bore size, class, and material.
StandardASME B16.5
FunctionIntegrated Flange + Reducer
Classes150# to 2500#
Sizes2"x1/2" to 24"x20"
Part Number Example
SKL-RED-040-020-150RF-A105N
SKLBrandSkyland Metal & Alloys
REDTypeReducing Flange
040Outer Size4" NPS Flange
020Bore Size2" NPS Reduced Bore
150RFClassClass 150 Raised Face
A105NMaterialASTM A105N Carbon Steel
Technical specifications
Design CodeASME B16.5
Operational Notes
Avoid abrupt line reductions where high-velocity slurries might cause localized erosion.
Product Overview
Reducing flanges are ideal for connecting smaller valve or pump nozzles directly to larger header lines in compact pump skids.