07 – Symbols, Codes and Notations in OCP UQD Specification v2.0.0
Source: OCP Design Specification Universal Quick Disconnect (UQD) v2.0.0, effective 2026-09-22
Related: 02-Parameters.md · 04-Backlog.md · 05-Pressure_Drop_9.1.4.md · 06-Seal_Washout_9.1.5.md
How to read this document
Every symbol, letter code, note flag, schematic symbol, unit and abbreviation that appears in the specification is listed here with its meaning and where it is used.
The Basis column tells you where the meaning comes from:
- Spec – stated in the specification text, a table or a figure key.
- Std – standard engineering-drawing or industry convention; the specification does not define it.
- Drawing – our reading of the drawing geometry. Treat as interpretation until confirmed.
Open questions are tracked only in 04-Backlog and referenced by ID.
Contents
- Drawing symbols
- Note flags (boxed numbers)
- Dimension letter codes
- Figure labels and callouts
- Test schematic symbols
- Inspection zones (Figure 16)
- Equations and math symbols
- Units and unit notation
- Thread and termination designations
- Report template codes
- Abbreviations
1. Drawing symbols
Used in Figures 4–10 and Tables 1–4. The specification does not name a drawing standard (ASME Y14.5 or ISO GPS), see MD-026.
| Symbol |
Name |
Meaning |
Example |
Basis |
| Ø |
Diameter |
The dimension is a diameter. |
ØB, ØH |
Std |
| ± |
Bilateral tolerance |
Allowed deviation above and below nominal. |
±0.025 |
Std |
| +0.30 / −0.00 |
Unilateral tolerance |
Deviation allowed in one direction only. |
SA (Table 4) |
Std |
| ° |
Degree |
Angle. |
35°±0.5° |
Std |
| R |
Radius |
Radius of a fillet or edge break. |
R0.2±0.10 |
Std |
| R0.2-0.3 |
Radius range |
Radius anywhere within 0.2–0.3 mm. |
Figure 8 Detail A |
Std |
| R0.3 MIN OR EQUIVALENT CHAMFER |
Edge break |
Minimum radius 0.3 mm, or a chamfer that removes at least the same material. |
Figure 8/10 Detail B |
Spec |
| nX (2X, 4X) |
Number of places |
The callout applies to n identical features. |
2XØG, 2X R0.4, 4XR0.2 |
Std |
| MIN / MAX |
Single limit |
Only a lower or upper limit is set; the other side is free. |
J MIN, R MAX |
Spec |
| [MIN, MAX] |
Limit interval |
Value anywhere inside the interval. Replaces the ±0.025 tolerance for C on sizes 06 and 08 (ER-009). |
C = [9.45, 9.65] |
Spec |
| REF / ( ) |
Reference dimension |
Information only, derived from other dimensions. Not inspected. |
(S), (T), (ØRR), (1.15) |
Std, Spec §6.2 |
| * |
Asterisk |
Footnote marker on a table column. |
C* in Table 1 and 3 |
Spec |
| Ⓔ (circled E) |
Envelope requirement |
Perfect form at maximum material size: the feature must fit inside a perfect cylinder of its MMC size. Not defined in the spec (MD-026). |
ØHⒺ, ØLⒺ, 2XØGⒺ |
Std |
| TSC |
Theoretical sharp corner |
Dimension is to the intersection of the two surfaces, not to the actual radius or chamfer (NOTE 6). |
AA, T, U |
Spec |
| .000 |
Zero datum line |
Origin for axial position dimensions (plug tip or socket face). All lettered positions are measured from this line. |
Figures 8, 9, 10 |
Drawing |
| HEX |
Hexagon |
Wrench flats, size across flats per Table 5 (NOTE 3). |
HEX ③ |
Spec |
| 32Ra MAX |
Surface roughness |
Arithmetic mean roughness, maximum 32. Unit not stated: 32 µin = 0.8 µm is the common practice (MD-027). |
NOTE 2 |
Spec, unit Std |
| ℄ |
Centerline |
Axis of revolution. |
Figure 5 |
Std |
| — · — (dash-dot line) |
Center / axis line |
Axis of the part. |
Figure 5, Figure 10 |
Std |
| X – X with arrows |
Section line |
Cutting plane; arrows show viewing direction for SECTION X-X. |
Figures 7–10 |
Std |
| Hatching |
Section fill |
Cut material in a section view. |
All section views |
Std |
| Circle + SEE DETAIL n |
Detail callout |
Area enlarged in Detail A, B or C. |
Figures 8, 9, 10 |
Std |
| Keep-in-zone |
Envelope |
Space the part must stay inside, any shape allowed within. |
CC, DD, NOTE 5 |
Spec |
2. Note flags (boxed numbers)
A number in a box (e.g. ②) on a drawing points to the NOTE with the same number in the table below the figure.
| Flag |
Meaning |
Used in |
Basis |
| 1 |
Termination location, see Table 5 |
Tables 1–4 |
Spec |
| 2 |
Sealing / interoperability surface, machine to 32Ra MAX |
Tables 1–4 |
Spec |
| 3 |
Hex feature for installation on this surface, see Table 5 |
Tables 2–4 |
Spec |
| 4 |
Seal gland(s) located on this surface, QD supplier defined |
Tables 1, 3 |
Spec |
| 5 |
QD supplier defined area, keep-in-zone bounded by Y, K and MIN angle (150°) |
Table 4 |
Spec |
| 6 |
Dimension to theoretical sharp corner (TSC) |
Tables 2, 3 |
Spec |
| 7 (Table 3) |
Non-standard zone, QD manufacturing specific |
Table 3 / Figure 9 |
Spec |
| 7 (Table 4) |
Self-alignment (SA) shall be incorporated into plug assembly; dimension is a radial allowance |
Table 4 / Figure 10 |
Spec |
NOTE 7 has different meanings in Table 3 and Table 4 (ED-011). NOTE 3 is missing from Table 1 (ED-005).
3. Dimension letter codes
All dimensions in mm unless stated. Values per size are in 02-Parameters.md §5.
Type: Ø = diameter · Pos = axial position from the .000 datum · Len = length · ∠ = angle · Env = keep-in envelope.
| Code |
Type |
Meaning |
Tolerance |
Basis |
| A |
Ø |
Entry bore at the socket mouth (plug lead-in) |
MIN |
Drawing |
| B |
Ø |
Sealing bore; mates with plug Ø H (NOTE 2) |
±0.025 |
Spec, Drawing |
| C |
Ø |
Socket valve stem diameter |
±0.025; [MIN, MAX] for 06/08 |
Spec |
| E |
Len |
Socket face to valve stem front face |
MIN–MAX |
Drawing |
| F |
Len |
Short axial zone just in front of the valve stem face, at the seal gland surface (NOTE 4) |
±0.10 |
Drawing |
| S |
Len |
Valve stroke, labelled Smax and REF (ER-013). Carries through all four configurations (§7.1). |
REF |
Spec |
| CC |
Env |
Maximum outer diameter keep-in, including latch. Asymmetric latches may exceed it (§7.1). |
MAX |
Spec |
| DD |
Env |
Maximum overall length keep-in |
MAX |
Spec |
| 35°±0.5° |
∠ |
Entry chamfer at socket mouth |
±0.5° |
Spec |
Positions AA, P, N, Q, J, BB are measured from the plug tip (.000). Values increase toward the termination: AA < P < N < Q < J < BB.
| Code |
Type |
Meaning |
Tolerance |
Basis |
| G |
Ø |
Locking flange / shoulder outer diameter, two features (2X), envelope Ⓔ. Bounds the latch (§7.1.1). Which two features is not marked (MD-031). |
±0.025 |
Spec, Drawing |
| H |
Ø |
Sealing shaft outer diameter; mates with socket Ø B (NOTE 2, Ⓔ) |
±0.025 |
Spec |
| J |
Pos |
Front face of the hex: minimum free length the socket may occupy |
MIN |
Drawing |
| L |
Ø |
Plug bore at the tip (NOTE 2, Ⓔ) |
±0.025 |
Spec |
| M |
Len |
Tip to plug valve face (valve recess depth) |
MIN–MAX |
Drawing |
| N |
Pos |
Latch groove edge toward the flange |
±0.1 |
Drawing |
| P |
Pos |
Rear face of locking flange (latch contact surface, Detail A). Bounds the latch (§7.1.1). |
±0.06 |
Spec, Drawing |
| Q |
Pos |
Shoulder edge at the rear of the latch groove. Bounds the latch (§7.1.1). |
±0.3 |
Spec, Drawing |
| R |
Ø |
Latch groove root diameter. Bounds the latch (§7.1.1). |
MAX |
Spec, Drawing |
| AA |
Pos |
Front of locking flange, to TSC (NOTE 6) |
±0.10 |
Spec |
| BB |
Pos |
Rear face of hex; also the pivot point for angled approach (Figure 5) |
±0.10 |
Spec, Drawing |
| GG |
Ø |
Maximum diameter over the hex (across corners envelope) |
MAX |
Drawing |
| HH |
Len |
Cylindrical land at the plug tip before the edge break (Detail B, NOTE 2) |
±0.10 |
Drawing |
| JJ |
∠ |
Lead-in angle at the plug tip (Detail B) |
±1.0° |
Drawing |
| S |
Len |
Valve stroke (reference), see 3.1 |
REF |
Spec |
| 20° / 45° / 35°±0.5° |
∠ |
Detail A angles: latch contact face, flange front face, cone to shaft |
±0.5° |
Spec |
| R1.0±0.10, R0.2±0.10, R0.2-0.3 |
R |
Detail A fillets at groove root and flange edges |
as shown |
Spec |
| 2X R0.4±.10 |
R |
Detail B: two radii at the tip land |
±0.10 |
Spec |
Positions T, V, MM, FF are measured from the socket face (.000). Table 3 rows are wrongly labelled UQD02…08 (ED-001).
| Code |
Type |
Meaning |
Tolerance |
Basis |
| B |
Ø |
Sealing bore (NOTE 2); same values as UQD socket |
±0.025 |
Spec |
| C |
Ø |
Socket valve stem diameter |
±0.025; [MIN, MAX] for 06/08 |
Spec |
| T |
Pos |
Reference position where the 25° entry cone meets bore U, to TSC (NOTE 6) |
REF |
Drawing |
| U |
Ø |
Inner diameter at the bottom of the entry cone, to TSC (NOTE 6) |
±0.1 |
Drawing |
| V |
Pos |
Valve stem front face |
±0.3 |
Drawing |
| FF |
Pos |
Rear wall of the Detail C groove |
±0.1 |
Drawing |
| MM |
Pos |
Front wall of the Detail C groove |
±0.15 |
Drawing |
| KK |
Ø |
Hex corner chamfer diameter |
MIN |
Drawing |
| NN |
Ø |
Groove root diameter (Detail C) |
±0.2 |
Drawing |
| PP |
Len |
Hex length (wrench engagement) |
MIN |
Drawing |
| QQ |
Ø |
Front outer diameter; mating surface for accessories and caps |
±0.15 |
Spec §7.3, Drawing |
| RR |
Ø |
Body diameter at the hex/termination end (shown as reference in section view) |
±0.15 |
Drawing |
| S |
Len |
Valve stroke (reference) |
REF |
Spec |
| 25.0°±0.5° |
∠ |
Entry cone, sealing / interoperability surface (NOTE 2). Hard-stop surface for hybrid (§6.2.1). |
±0.5° |
Spec |
| 2.65±0.1, (1.15), 4XR0.2±0.1 |
Len, R |
Detail C groove width, reference depth, groove radii |
as shown |
Spec |
| R0.2MIN, R0.2±0.10 |
R |
Fillets at cone and bore |
as shown |
Spec |
| 1.5 MIN |
Len |
Length between flange and termination thread (drawing value, same for all sizes) |
MIN |
Drawing |
Positions K, Y, X are measured from the plug tip (.000). §7.4 text says "socket" but means plug (ER-007).
| Code |
Type |
Meaning |
Tolerance |
Basis |
| H |
Ø |
Sealing shaft outer diameter (NOTE 2, Ⓔ); same as UQD plug |
±0.025 |
Spec |
| L |
Ø |
Plug bore at the tip (NOTE 2, Ⓔ) |
±0.025 |
Spec |
| M |
Len |
Tip to plug valve face |
MIN–MAX |
Drawing |
| K |
Pos |
Front boundary of the supplier-defined zone (NOTE 5) |
±0.3 |
Spec |
| Y |
Pos |
Flange front face; hard-stop face for UQDB (§6.2.1) and rear boundary of NOTE 5 zone |
±0.3 |
Spec, Drawing |
| X |
Pos |
Flange rear face |
±0.1 |
Drawing |
| W |
Ø |
Flange outer diameter |
±0.15 |
Drawing |
| SA |
Len |
Self-alignment: radial float of the plug shaft relative to its body (NOTE 7). Used as misalignment in 9.1.3 and 9.2.3 (MD-014, BS-007). |
+0.30 / −0.00 |
Spec |
| HH, JJ |
Len, ∠ |
Tip land and lead-in angle, same as UQD plug (Detail B) |
±0.10, ±1.0° |
Spec |
| 150° MIN |
∠ |
Minimum included angle of the cone that bounds the NOTE 5 zone |
MIN |
Spec |
| S |
Len |
Valve stroke (reference) |
REF |
Spec |
| Label |
Figure |
Meaning |
Basis |
| TERMINATION |
1, 2, 3 |
End feature that connects to tube, pipe or port |
Spec §4 |
| LOCKING FEATURES |
2 |
Latch on UQD socket and groove on UQD plug |
Spec |
| INTEGRAL ALIGNMENT MECHANISM |
1 |
Self-alignment (SA) built into the UQDB plug |
Spec |
| SEALING INTERFACE |
1, 2, 3 |
Surfaces with NOTE 2 |
Spec |
| SOCKET VALVE STEM |
1, 2, 3 |
Fixed centre poppet in the socket (Ø C) |
Spec |
| PLUG – UQD / PLUG – UQDB / SOCKET – UQD / SOCKET – UQDB |
1, 2, 3 |
Coupling half |
Spec |
| (CONNECTED LENGTH) |
4, 6 |
Panel-to-panel length in coupled state, reference value, excluding terminations (§6.2) |
Spec |
| TOP / BOTTOM |
4 |
Top = hybrid, bottom = UQDB |
Spec |
| PIVOT (BB) |
5 |
Rotation point of the plug at an angled approach, located at dimension BB |
Spec, Drawing |
| APPROACH ANGLE |
5 |
Angle between plug and socket axes while mating. No value given (MD-029). |
Spec |
| LOCKING MECHANISM CONTACT SURFACES |
8 Detail A |
Surfaces the socket latch bears on |
Spec |
| DETAIL A / B / C |
8, 9, 10 |
Enlarged views |
Std |
5. Test schematic symbols
| Symbol |
Meaning |
Basis |
| Rounded box |
One test |
Spec |
| Boxes side by side, no arrows (Fig. 11, 15) |
Tests run in parallel with different samples |
Spec §9 |
| Hollow arrow ⇨ (Fig. 12) |
Run in sequence on the same samples |
Spec §9 |
| Symbol |
Meaning |
Basis |
| 1 |
Coupling under test (drawn as two facing valve halves) |
Spec key |
| 2 |
Pressure tap (two, one each side) |
Spec key |
| 3 |
Differential pressure measuring device |
Spec key |
| 4 |
Controlled fluid supply |
Spec key |
| L1 |
Upstream straight length ≥ 10 × tube ID |
Spec key |
| L2 |
Tap to coupling ≥ 5 × ID |
Spec key |
| L3 |
Length of coupling plus end fittings |
Spec key |
| L4 |
Downstream straight length ≥ 10 × ID |
Spec key |
| L5 |
≥ 5 × ID (downstream instrument spacing) |
Spec key |
| L6 |
Shown, not in key (ED-008) |
– |
| Circle with pointer |
Pressure or temperature gauge, not in key (ED-012) |
Std |
| Circle with curved line |
Flow meter, not in key (ED-012) |
Std |
| Open box at outlet |
Drain / reservoir |
Std |
| → |
Flow direction |
Std |
| Symbol |
Meaning |
Basis |
| A (valve ⋈) |
Valve to pressurize the loop via the air accumulator (Test Setup step 4) |
Spec |
| Air (capsule) |
Air-charged accumulator / expansion tank; holds loop pressure |
Drawing |
| B (valve ⋈ in bypass) |
Bypass valve around the pump, used to set flow (step 1) |
Spec, Drawing |
| Circle with triangle |
Circulator pump |
Std |
| C PSIG (⊗) |
Pressure gauge upstream of the QD; reads max operating pressure (step 4) |
Spec |
| D PSIG (⊗) |
Pressure gauge downstream of the QD. Role not described (MD-028). |
Drawing |
| WHA |
Water hammer arrestor, one each side of the QD; limits disconnect spike. Not defined in spec (ED-010). |
Std |
| Dark bowtie |
QD under test |
Drawing |
| LPM |
Flow meter in litres per minute |
Std |
| L: <5 x ID |
Pipe length WHA to QD less than 5 × inside diameter |
Spec |
Used with Table 10 acceptance criteria (Appendix 15.2, recommendation only).
| Zone |
Part |
Location |
Surface defect limit (Table 10) |
Basis |
| 1 |
UQD and UQDB plug |
Termination (stud thread) |
≤ 0.3 mm² · thread check |
Spec, Drawing |
| 2 |
UQD and UQDB plug |
Tip / sealing shaft |
≤ 0.3 mm² |
Spec, Drawing |
| 3 |
UQD and UQDB plug |
Hex, flange and latch area |
≤ 1.0 mm² |
Spec, Drawing |
| 4 |
UQD socket |
Hosebarb |
≤ 1.0 mm² |
Spec, Drawing |
| 4A |
UQD socket |
Barb end section |
≤ 0.3 mm² |
Spec, Drawing |
| 4B |
UQD socket |
Short section at barb root |
≤ 0.3 mm² |
Spec, Drawing |
| 5 |
UQD socket |
Body |
≤ 1.0 mm² |
Spec |
| 6 |
UQDB socket |
Body incl. hex |
≤ 1.0 mm² |
Spec |
| 7 |
UQDB socket |
Termination (stud thread) |
≤ 0.3 mm² · thread check |
Spec |
Boundary between zone 4 and 4A/4B is unclear (ED-007).
7. Equations and math symbols
| Symbol |
Meaning |
Unit |
Where |
Basis |
| ΔP, dP |
Pressure drop across the coupled pair (same quantity, two spellings) |
psi |
§9.1.4, Table 6 |
Spec |
| Q |
Flow rate |
L/min in ΔP fit · GPM in Cv |
§9.1.4 |
Spec |
| ΔP(Q) = A·Q² + B·Q |
Quadratic pressure-drop fit through origin |
psi, L/min |
Table 6, §9.1.4 |
Spec |
| A |
Quadratic coefficient (turbulent losses) |
psi/(L/min)² |
§9.1.4 |
Spec |
| B |
Linear coefficient (laminar losses) |
psi/(L/min) |
§9.1.4 |
Spec |
| Cv |
Flow coefficient: flow in US GPM of water at 1 psi drop |
– |
Table 6 |
Spec |
| Cv = Q·√(SG/ΔP) |
Cv definition |
Q GPM, ΔP psi |
§9.1.4 |
Spec |
| SG |
Specific gravity of test fluid relative to water. Value not given (MD-006). |
– |
§9.1.4 |
Spec |
| y = mx + b |
Coupling force at pressure: F = F0psi,max + p × scaling factor |
N or lbf |
Table 6 note 4 |
Spec |
| ↳ y |
Max allowed coupling force at the test pressure |
N / lbf |
|
Spec |
| ↳ m |
Force / pressure scaling factor (ER-001) |
N/bar · lbf/psi |
|
Spec |
| ↳ x |
Test pressure |
bar · psi |
|
Spec |
| ↳ b |
Maximum coupling force at 0 psi |
N / lbf |
|
Spec |
| n |
Number of samples (n = 5 minimum) |
– |
§9.1.4 |
Spec |
| T0 |
Time zero = date of manufacture (storage life); also start pressure in 9.2.1 |
– |
Table 6, §9.2.1 |
Spec |
| ID |
Inside diameter of tube/hose |
mm, in |
Fig. 13, 14 |
Spec |
| 2x, 3x, 5 x ID |
Multiplier |
– |
§9.1.1, §9.1.5, Fig. 14 |
Spec |
| ≤ / < |
Less than or equal / less than |
– |
Table 10, Fig. 14 |
Std |
| @ |
"at" (e.g. force @ 0 psi) |
– |
Table 6 |
Std |
8. Units and unit notation
| Notation |
Meaning |
Conversion / comment |
Basis |
| mm |
Millimetre |
Default unit for all dimensions (§7) |
Spec |
| bar(g) |
Bar gauge pressure (above atmospheric) |
1 bar = 14.504 psi |
Spec |
| psi(g), psig, PSIG |
Pound per square inch, gauge |
100 psi = 6.895 bar |
Spec |
| psi (in ΔP) |
Differential pressure; correct notation is psid (ER-004) |
– |
Spec |
| L/min, LPM |
Litre per minute |
1 GPM = 3.785 L/min |
Spec |
| GPM |
US gallon per minute |
– |
Spec |
| N |
Newton |
1 lbf = 4.448 N |
Spec |
| lbf |
Pound-force |
– |
Spec |
| N(bar) |
Scaling factor in newton per bar; means N/bar (ED-009) |
– |
Table 6 |
| lbf(psi) |
Scaling factor in pound-force per psi; means lbf/psi (ED-009) |
– |
Table 6 |
| Nm |
Newton metre (torque) |
– |
Table 5 |
| mL |
Millilitre (fluid loss per cycle) |
– |
Table 6 |
| L |
Litre (enclosure volume ≤ 0.5 L) |
– |
§9.2.1 |
| °C / °F |
Temperature |
°F = °C × 1.8 + 32 |
Spec |
| °C/min |
Temperature transition rate |
– |
§9.2.1, §9.2.2 |
| H (e.g. 72H) |
Hours |
– |
§9.2.1 |
| mm/s |
Connection speed (40 ± 10 mm/s) |
– |
§9.1.3 |
| mm² |
Defect area |
– |
Table 10 |
| LUX |
Illuminance (700–1200 lux for inspection) |
– |
§15.2.1 |
| Ra |
Surface roughness, unit missing (MD-027) |
32 µin = 0.8 µm |
Spec |
| " / in |
Inch (e.g. .375" hose ID) |
1 in = 25.4 mm |
Spec |
| # |
Count (number of cycles) |
– |
Table 6 |
| ◦ |
Typo for ° in Table 2 (ED-006) |
– |
Spec |
9. Thread and termination designations
| Notation |
Meaning |
Example |
Basis |
| ORB-nn |
O-ring boss stud end per ISO 11926-3 / SAE J1926-3. The dash number is the tube OD in 1/16 in. |
ORB-06 = 3/8" tube |
Spec, Std |
| 7/16-20 |
Thread: nominal diameter 7/16 in, 20 threads per inch |
– |
Std |
| UNF |
Unified National Fine thread series |
9/16-18 UNF |
Std |
| UN |
Unified National constant-pitch series |
1-1/16-12 UN |
Std |
| -2A |
Thread class 2, external (A) |
UNF-2A |
Std |
| HB |
Hosebarb (push-lock), size = hose ID |
3/8" HB |
Spec |
| Stud End ISO 11926-3 |
Light-duty (L series) stud end with O-ring |
Table 5 |
Spec |
| ISO 11926-1 |
Mating port with O-ring in truncated housing |
Table 5 note 1 |
Spec |
| 11926 7/16 etc. |
Tare adapter stud end per ISO 11926 with given thread |
Tare table §9.1.4 |
Spec |
| THREAD 1 / THREAD 2, LENGTH L / L2, DIAMETER D |
Tare adapter thread ends, overall length, thread length and diameter (MD-021) |
§9.1.4 |
Spec |
10. Report template codes
| Code |
Meaning |
Where |
Basis |
| P/F |
Pass / Fail |
§15.3.3 |
Spec |
| Pass / Fail / NA |
Pass, fail or not applicable |
§15.3.3 |
Spec |
| S-P |
Flow direction socket → plug |
9.1.4, 9.1.5 |
Spec |
| P-S |
Flow direction plug → socket |
9.1.4, 9.1.5 |
Spec |
| Y/N |
Yes / no |
9.1.4 (meets min Cv) |
Spec |
| Avg. |
Average |
§15.3.3 |
Spec |
| Sample ID / Sample Pair ID |
Identifier of the sample or mated pair |
§15.3.3 |
Spec |
| Plug / Socket / Mated |
Disconnected plug, disconnected socket, coupled pair |
§15.3.3 |
Spec |
11. Abbreviations
| Abbreviation |
Meaning |
Basis |
| UQD |
Universal Quick Disconnect – handmate |
Spec §4 |
| UQDB |
Universal Quick Disconnect – blindmate |
Spec §4 |
| UQDH |
Probably UQD handmate; used only in the tare table, not defined (ED-004) |
– |
| QD |
Quick disconnect |
Spec |
| Handmate / Blindmate / Hybrid |
Manual coupling / indirect coupling / UQD plug in UQDB socket |
Spec §4 |
| Plug |
QD half with exterior mating geometry (male, insert) |
Spec §4 |
| Socket |
QD half with interior mating geometry (female, body) |
Spec §4 |
| Hard-stop |
Coupled to mechanical contact |
Spec §4 |
| Overdrive (floating device) |
Device allowing radial and axial movement of one coupling half |
Spec §6.2.1 |
| SA |
Self-alignment (radial allowance) |
Spec Table 4 |
| TSC |
Theoretical sharp corner |
Spec |
| REF |
Reference dimension |
Spec |
| TCS |
Technology Cooling System (fluid loop) |
Spec §6 |
| IT |
Information technology (equipment) |
Spec |
| LFC |
Liquid-filled component (IEC 62368-1) |
Spec §13 |
| PS3 |
Power source class 3 (IEC 62368-1) |
Std |
| PUE |
Power usage effectiveness (datacenter) |
Std |
| PG25 |
25 % propylene glycol in water |
Std |
| EPDM |
Ethylene propylene diene monomer rubber (hose) |
Std |
| SUS |
Stainless steel grade designation (JIS), e.g. SUS 316L |
Std |
| PET |
Polyethylene terephthalate (packaging trays) |
Std |
| L10 |
Used in Table 6 note 5 without definition (MD-030) |
– |
| WHA |
Water hammer arrestor (ED-010) |
Std |
| OCP |
Open Compute Project |
Spec |
| OWF / OWFa / CLA / FSA |
Open Web Foundation (Agreement), Contributor License Agreement, Final Specification Agreement |
Spec §1 |
| ISO 18869 |
Hydraulic fluid power – test methods for couplings |
Spec [4] |
| ASTM E493 |
Helium mass spectrometer leak test method (not in §14, ED-013) |
Spec §9 |
| SAE J1926 |
O-ring boss ports and stud ends, cited in tare figure only (ED-013) |
Spec §9.1.4 |
| IEC 62368-1 |
Safety of AV/ICT equipment |
Spec [7] |
| UL94 V1 / V2 |
Flammability classes for plastics |
Spec §13 |
| TAPPI/ANSI T 564 |
Dirt estimation chart for defect sizing (not in §14, ED-013) |
Spec §15.2.1 |
| v1 / v2 |
Specification version marking, e.g. "UQD04 v2" (Table 7) |
Spec §11 |