Custom Quartz Flanges

Quartz flanges machined to a sealing face, bolt pattern, and port geometry — sized to weld onto your tube or seal against your equipment, not just a flat ring.

OD, ID, thickness, bolt pattern, and sealing-face condition are one feature set, not independent specs — a bolt hole positioned too close to the ID or OD affects both flatness and the sealing face around it. Send the complete flange drawing, not dimensions piecemeal.

Custom Quartz Flanges for Vacuum, Furnace and Process Equipment

Flanges seal a quartz tube or chamber to the rest of a system — vacuum equipment, furnace ports, or process chambers — either quartz-to-quartz or as a transition to a metal fitting. The sealing face and bolt pattern are what actually make the connection work; OD and ID alone don't define a functional flange.

Loose, Welded, Grooved and Bolt-Hole Flange Designs

Loose flanges (not fused to a tube, held in place by the assembly) and welded flanges (fused directly to a tube end) serve different assembly needs — a loose flange allows rotation before final tightening, a welded flange is fixed. Grooved flanges (with an O-ring channel machined into the sealing face) are used where the seal needs to be gas- or vacuum-tight; plain bolt-hole flanges without a groove suit lower-demand mechanical connections.

Sealing Faces, O-Ring Grooves and Bolt Patterns

The sealing face is ground flat and checked separately from the rest of the flange — a flange can meet its overall thickness and OD spec and still fail to seal if the sealing face isn't flat enough. O-ring groove width and depth are matched to your O-ring cross-section, not a generic groove size. Bolt pattern (hole count, diameter, PCD) is confirmed against your mating flange or equipment, since a mismatched bolt pattern won't assemble even if every other dimension is correct.

Quartz Flanges Factory Standard & Manufacturing Limit

The table above is what's repeatable without added lead time. Sealing-face flatness and PCD tolerance are the two figures most likely to need confirmation at the tightest end, since they directly determine whether the flange seals against its mating part.

Tube-to-Flange Connections and Assembly Requirements

Welded flanges are fused to the tube by hot welding, then annealed to relieve stress at the joint — a common failure point if annealing is skipped. Send tube OD and wall thickness alongside your flange spec so the weld joint can be sized correctly. Before shipment we check OD, ID, thickness, PCD/hole position, sealing-face condition, flatness, and weld seams (welded units).