Titanium Stub Ends are short pipe nipples with one end flared into a rounded shoulder. The Lap Joint flange ring slips over this shoulder, allowing rotation for bolt hole alignment.
Titanium Stub Ends are short pipe nipples with one end flared into a rounded shoulder. The Lap Joint flange ring slips over this shoulder, allowing rotation for bolt hole alignment. Stub End and LJ flange ring are two separate products that work together. The Stub End provides the sealing face that mates with the gasket, while the LJ flange ring provides the bolt holes and structural backing.
Stub Ends are butt-welded to the pipe end at the non-flared side, creating a permanent connection. The LJ flange ring is then slipped over the pipe and positioned behind the Stub End shoulder before bolt-up. Supply is reviewed per inquiry against standard, NPS, schedule, grade, facing and quantity.
Reviewed against your required standard, nominal pipe size and schedule.
ASME B16.9 is the primary reference for stub end dimensions (butt-weld fittings). Facing references ASME B16.5 mating requirements for LJ flange ring compatibility.
RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint). Facing must match the mating LJ flange ring pressure class.
Industry Standard: NPS ½ through NPS 24 per ASME B16.9.
Custom Manufacturing: Larger sizes custom evaluated per forging capacity.
Actual Supply Availability: Confirmed per inquiry against grade, schedule and facing.
Piping systems requiring frequent disassembly for cleaning, inspection or reconfiguration.
Corrosion-resistant connections where future equipment removal is anticipated.
Tube-side and shell-side connections where bolt-hole alignment flexibility is valued.
They are two separate products. The Stub End is a short pipe nipple with one end flared into a rounded shoulder and a standard butt-weld end on the other. It provides the gasket-sealing face. The Lap Joint flange ring is a flat bored disc with bolt holes that slips over the pipe and sits behind the Stub End shoulder, providing the structural bolt-up connection. Together they form a lap joint connection. Neither functions independently.
Yes, Stub Ends can be supplied separately if you already have LJ flange rings in stock. We will need the LJ flange ring specification (standard, pressure class, NPS) to confirm compatibility.
Stub ends are designated as NPS x schedule x facing. For example: 6-Sch40-RF. Stub end dimensions per ASME B16.9. The facing must match the mating LJ flange ring pressure class and standard.
Stub end dimensions commonly reference ASME B16.9 for butt-weld fittings. The facing references ASME B16.5 mating requirements — the seal face geometry must match your LJ flange ring specification. Confirm both standards at inquiry.
Please specify whether you need Stub Ends only or a matched set with LJ flange rings. Include standard (e.g., ASME B16.9), nominal pipe size (NPS), schedule, grade, facing and quantity. We will confirm availability and supply conditions. For drawing-based or custom requirements, you may share your drawings with our sales team by email or WhatsApp after initial contact. Include material grade, dimensions, tolerances, quantity and drawing reference.
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