Size Selection
1/2" - 2"1/2" to 2" NPS (DN 15 - DN 50)
3" - 8"3" to 8" NPS (DN 80 - DN 200)
10" - 24"10" to 24" NPS (DN 250 - DN 600)
26" - 36"26" to 36" NPS (DN 650 - DN 900)
Product page
SKYLAND
ASME B16.9 Buttweld Long Pattern Stub End (Lap Joint)
Skyland Long Pattern Buttweld Stub Ends are designed for lap joint flange connections in industrial piping. Featuring a flared raised-face collar with concentric serrations and a long beveled barrel, they allow the use of low-cost carbon steel backing flanges over high-alloy process pipe, providing substantial cost savings in stainless and exotic alloy systems while facilitating quick bolt alignment.
Standard compliance: ANSI / ASME B16.9 Long Pattern, MSS SP-43, and DIN standards
Available in Type A (for standard Lap Joint Flanges with radius) and Type B (for Slip-On Flanges)
Sizes: 1/2" to 36" NB (DN 15 to DN 900) in seamless and welded execution
Wall schedules: Sch 5S, 10S, 40S, STD, 80S, XS, 160
Ready for quotationShare your range, connection and case requirement.
Talk to ATHStandardANSI / ASME B16.9 Long Pattern, MSS SP-43 Type A/B
Size Range1/2" to 36" (DN 15 to DN 900)
SchedulesSch 5S, 10S, 40S, STD, 80S, XS, 160
Flange TypesType A (Lap Joint Flange), Type B (Slip-on Flange)
MaterialsStainless A403 WP304L/316L, Duplex 2205, Super Duplex, Titanium
CertificationsEN 10204 3.1, PED 2014/68/EU, ISO 9001:2015
Technical Selection
ASME B16.9 Long Pattern Stub End Data
Select nominal pipe size, pattern type (Type A vs Type B), and material alloy.
StandardASME B16.9 Long Pattern
Sizes1/2" to 36"
SchedulesSch 5S to Sch 160
Face FinishSerrated 125-250 Ra
Part Number Example
SKL-LSE-040-SCH10S-316L-A
SKLBrandSkyland Metal & Alloys
LSETypeLong Pattern Stub End
040Size4" NPS (DN 100)
SCH10SScheduleSchedule 10S
316LMaterialASTM A403 WP316L
AStyleType A (Lap Joint Flange)
Technical specifications
StandardASME B16.9 / MSS SP-43
Barrel LengthStandard Long Pattern per ASME B16.9
Operational Guidelines
Type A stub ends feature an external corner radius designed to seat against a standard Lap Joint Flange.
Type B stub ends feature a squared corner designed for use with standard Slip-On Flanges used as backing rings.
Engineering Advantage
Stub ends allow the backing flange to freely rotate around the pipe barrel before tightening bolts, eliminating bolt-hole misalignment issues common with fixed welded flanges.
In corrosive systems, only the stub end wetted surface needs to be stainless steel or nickel alloy, while the rotating backing flange can be standard carbon steel, saving up to 60% in flange material costs.