Mechanical connector dimensions

The new connector catalogue uses exact listed tube ODs and explicit manufacturer part codes. It does not select a nearby diameter or silently substitute another thread standard. Installation dimensions are in millimetres. The CAD bodies are simplified representations, not supplier CAD models or service approvals.

SMC KQ2 pneumatic push-in unions

Source: SMC KQ2, CAT.ES50-37B, printed pages 5 (straight union), 9 (elbow) and 20 (tee). The drawings and tables were visually checked. D is the body diameter; M is tube insertion from the entrance. Each straight-union entrance is L/2 from its centre. For elbows and tees, every entrance is L or L1 from the axis intersection. Tee L2 describes the overall branch envelope, not its entrance offset.

Tube OD Straight union / L Elbow / L Tee / L1 D M Minimum port bore
4 KQ2H04-00A / 27.6 KQ2L04-00A / 15.3 KQ2T04-00A / 15.3 8.2 13.3 3.0
6 KQ2H06-00A / 27.6 KQ2L06-00A / 16.3 KQ2T06-00A / 16.3 10.4 13.3 4.5
8 KQ2H08-00A / 29.4 KQ2L08-00A / 18.2 KQ2T08-00A / 18.2 13.2 14.2 6.0
10 KQ2H10-00A / 32.2 KQ2L10-00A / 20.6 KQ2T10-00A / 20.6 15.9 15.6 7.5
12 KQ2H12-00A / 35.0 KQ2L12-00A / 23.0 KQ2T12-00A / 23.0 18.5 17.0 9.0

The fully inserted pipe end is at entrance offset - M; no weld gap applies. Socket bores represent nominal tube OD. Internal seals, collet details, moulded transitions and undimensioned lug thicknesses are simplified.

Page 1 lists FEP, PFA, nylon, soft nylon and polyurethane tubing. Matching OD alone does not establish material, fluid, pressure or temperature suitability. Use the selected tube and fitting manufacturer’s operating limits.

Matching polyurethane tube reference

Source: SMC general tubing catalogue, printed page 412 (PDF page 5), standard TU/TIUB table; visually checked.

SMC base model OD ID Wall, calculated Minimum bending radius
TU0425 4 2.5 0.75 10
TU0604 6 4 1 15
TU0805 8 5 1.5 20
TU1065 10 6.5 1.75 27
TU1208 12 8 2 35

These are flexible polyurethane tubes. The published radius is a reference measurement at 20 degrees C; it is not a calibrated CNC bending-tool CLR or a promise that a routed sweep has been checked against pressure, kinking or temperature limits. Colour and roll-length ordering suffixes are not implied by the base model identifiers. Wall is (OD-ID)/2.

GF 8270 BSP threaded coupling

Source: GF Z-Masse und Baulaengen, September 2024, printed page 129 for type 8270, page 74 for pipe OD / thread correspondence, and page 140 for the Z-dimension method. The product is a silicon-bronze coupling with female Rp threads, mating to R male pipe threads (EN 10226-1 / ISO 7-1).

Pipe OD Rp size Part code Overall a Wrench SW Pipe-end Z Mean insertion per end
13.5 1/4 inch 768270002 26 17 6 10
17.2 3/8 inch 768270003 28 20 8 10
21.3 1/2 inch 768270004 34 25 8 13
26.9 3/4 inch 768270005 37 30 7 15
33.7 1 inch 768270006 43 38 9 17

The model uses reference insertion (a-Z)/2, not a fixed internal stop. Actual thread engagement varies with threads and sealant; verify make-up before final cutting. NPT is not substituted. The drawing shows round sleeves with a central hex band. Its SW is sourced; hex circumdiameter is calculated. Undimensioned sleeve diameters, band widths, collars and thread details remain simplified. The smooth socket follows nominal pipe OD; its central passage uses the selected pipe ID and is not claimed as the manufacturer’s internal flow bore.

Alfa Laval sanitary weld ferrule

Source: Alfa Laval Tri-Clover Sanitary Fittings and Valves, PDF page 16 / printed 1.2.13 (L14AM #7, length and 316L item number), and PDF page 9 / printed 1.1.6 (basic connection dimensions). Both pages were visually checked. These rows describe a ferrule, not an assembled clamp union.

Tube OD mm Nominal size 316L item Length A mm Face diameter, source inches Face diameter, converted mm
25.4 1 inch 240644 28.6 1.984 50.3936
38.1 1 1/2 inch 240028 28.6 1.984 50.3936
50.8 2 inch 240027 28.6 2.516 63.9064

The source specifies 16ga tube wall: 0.065in = 1.651mm. A different selected tube wall is rejected. The clamp face is the placement origin; the one pipe-side butt-weld end is 28.6mm from that plane, with zero insertion. An explicit weld gap may be applied at the pipe end. The clamp face does not create a second pipe-side weld.

Head shoulders and undimensioned groove details are simplified. Clamp, gasket and compressed seating gap are omitted. Exact inch conversion is retained; the displayed decimal digits do not imply manufacturing tolerances or a hygienic certification.

Scope and excluded assumptions

No helical thread, sealing mechanism, pressure certification, sanitary finish qualification, flexible-tube mechanics or flow calculation is generated by these catalogue entries. Placement and orientation do not change the stored part identity. Rebuild rejects changed catalogue interface dimensions under the same manufacturer code.

NPT couplings, threaded three-piece unions and complete sanitary clamp unions are not inferred from nominal sizes. The inspected sanitary catalogues do not provide a complete compressed gasket seating dimension for an assembled union. An imported manufacturer model can be captured with explicitly defined ports for products outside the built-in rows.