Rendering: a tray sliding into a rack, its plug approaching the receptacle plate

UQDB03–06 · blind-mate · EIA 42U–52U

Blind-mate confidence

Tolerance first. Everything else follows.

Send tray + rack drawings

UQDB radial tolerance · industry-published benchmark ±1 mm misalignment absorbed

Published machining precision · industry-published benchmark ±0.005 mm for this part class

Rated-flow ΔP band · industry-published benchmark 25–150% of rated flow

One ring, three stack sources

Radial budget · rack · tray · manifold

Radial budget

±1 mm

the misalignment a UQDB interface is published as absorbing. It is a budget for the whole dock, not a property of one part. industry-published benchmark

Stack source 1 · rack

Verticality

rack verticality and the rear mounting face. Rack standards differ here: EIA 42U–52U and the ORv3 rack standard do not put the port row in the same place.

Stack source 2 · tray

Guide ways

tray rails and the path the tray actually takes as it slides home, which is rarely the path the drawing shows.

Stack source 3 · manifold

Mount face

manifold mounting position and port pitch. Pitch is set by the rack standard; the mounting face is set by the install.

Worst-case dock is tested, not just calculated from the nominal stack. The three sources above are the ones a dock fixture has to reproduce.

Rendering: a tray backplane carrying plug rows with guide pins on either side and sockets waiting beyond — Backplane rowPlugs, guide pins, sockets beyond

Rendering: the floating plate of a blind-mate interface with its guide pins and coil springs, seal seat behind — Float interfaceWhere the ±1 mm is absorbed

Rendering: a tray pushed fully home with its blind-mate plugs seated in the manifold sockets behind it — Docked stateTray home, plugs seated

Rendering: eight stainless blind-mate couplings of ascending size arranged as four pairs on a near-black ground

Rendering: a close view of a blind-mate plug entering its receptacle, machined edges picking up the rim light

Servicing under pressure

No spray Connect and disconnect under pressure

A service action is a pressure-bearing cycle. Liquid leaving the interface is a failure of that cycle, not an untidiness.

No bubble Air must not enter the loop

Introduced air moves the flow and the heat transfer with it. Bubble-free reconnect is an acceptance item.

25–150% Transient characterisation band

Characterised across that share of rated flow, which covers start-up, turndown and the moment of reconnect. industry-published benchmark

Rendering: six three-eighth-inch sockets in one row through a panel, braided hoses dropping below — Service faceSix sockets in one row, hoses below

Rendering: a tray connector pair advancing on a manifold port row, guide pins just entering the bushings — The moment of dockGuide pins entering bushings

Flow budget, split by element

Curve data · split structure · no invented shares

Flow band

25–150%

ΔP is measured at several points across that share of rated flow rather than at one nominal point. industry-published benchmark

Curve data

Cv / ΔP

documented curve data is supplied with the part, so the budget is built from measured points and not from a catalogue coefficient. industry practice

Budget split

Three lines

the budget is split by element, coupling, manifold port, branch hose, and only the structure is given here. Per-element pressure shares are not published without a measurement behind them.

Pitch reference

EIA / ORv3

port pitch follows the rack standard: EIA and the ORv3 rack standard do not share a pitch, and a manifold cannot serve both from one port row. See ORv3 manifolds.

Precision and life, as published

Benchmark column · acceptance column

Published benchmark Machining precision of ±0.005 mm for this part class, and a cycle life above 100,000 connect and disconnect cycles. Both figures belong to the industry, not to us. industry-published benchmark

Our acceptance Sealing faces and critical dimensions are measured feature by feature against the drawing and filed per batch; cycle records back the warranty terms. No cycle count is promised that has not been run. process capability

Two glazed doors of a white machine enclosure, seen from the front on a green epoxy floor

Where the dimensional half of the budget is set

The published precision figure is a property of the process, not of a catalogue. A dock is only as square as the parts going into it, which is why the tolerance chain is reviewed before the price is.

send tray + rack drawings → we re-run the stack

Rendering: a bent stainless bracket carrying two sockets, bolted to a rail with locknuts behind — Mounting hardwareBracket, bolts, locknuts

Rendering: five UQD-series couplings with red and cyan anodised rings and chrome bodies on a neutral grey gradient ground — Size familyColour-marked supply and return

Rendering: a machined coupling spigot on a brushed stainless rack panel, blue latch levers beside it and a black hose running out of frame — Rack sideRack panel and hose run

What arrives with the parts

Interfaces · first-article formats · fixtures

UQDB floating interfaces Blind-mate couplings with a floating interface, plus a rack manifold at the port pitch the rack standard sets.

FAI formats First-article reports are issued in AS9102 or PPAP format. Radial self-alignment of 1 mm is available, with the full 02–08 size range and inline or right-angle options. industry practice

Fixtures Dock fixtures for cross-mating are quoted with the parts, because a dock that cannot be reproduced cannot be reviewed.

A tolerance chain is only as good as the drawings it is run against. Send the tray and the rack, not a summary of them.

Tolerance stack review

Send us the dock, not the drawing set.

The published radial basis for this interface is ±1 mm (industry-published benchmark). What matters is how much of it your rack, your tray and your manifold have already spent before the coupling sees any of it.

Send tray + rack drawings One business day · English quote + a one-page spec sheet