# ISO 6149 metric O-ring boss ports (M8×1 to M60×2): spotface, depths, thread, O-ring

> What are the spotface, thread depth and O-ring of an ISO 6149 M16 × 1.5 or M22 × 1.5 port?

- Category: Tri-clamp & pipe › Pipe, tube & threads
- Kind: Standard part
- Basis: Parker Tube Fittings Division catalog 4300 table U17 (ISO 6149-1), cross-checked against the ISO 6149-1:2006 sample pages; O-ring sizes from Parker's TFD O-ring sheet; numbers only
- Page: https://xemstudio.com/objects/iso-6149-metric-o-ring-boss-ports/ · JSON: https://xemstudio.com/api/geometry?object=iso-6149-metric-o-ring-boss-ports · Plain text: https://xemstudio.com/objects/iso-6149-metric-o-ring-boss-ports/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
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**Exact dimensions.** True size, with no tolerance added.

## Notes

- ISO 6149-1 is the metric straight-thread O-ring port (the ISO 261 'M' thread, tolerance class 6H; tap drills to ISO 2306 class 6H; Parker lists it with SAE J2244-1 and DIN 3852 part 3). The table is Parker Tube Fittings Division 4300 catalog table U17 (page U25), in mm as the page implies, with the page's own letters: d2 spotface diameter with the optional identification ridge (large) and without it (small), d3 a reference diameter (a connecting-hole application may need another size), d4, d5, d6 (the page gives no definitions for these three), L1, L2 (tap drill depth, which needs a bottoming tap for the full thread; deepen it with a standard tap), L3, L4, and Z ±1°. Parker's notes: mark a port without the ridge 'metric' or name 'ISO 6149-1 Metric' on the nameplate; the standard hydraulic O-ring is 90 durometer nitrile.
- Cross-check: the ISO 6149-1:2006 sample pages (iTeh, OCR text) print the same values for every thread from M8 × 1 to M60 × 2, row by row, with d2 / d3 for the with / without-ridge spotface, 'b' for the reference connecting hole, d4, d5, L1 to L4 and Z. The ISO sample's M20 × 1.5 row (cartridge valve cavities, ISO 7789) reads 33 / 29 / 27.5 / 21.8 / 2.4 / 2 / 14.5 / 15°, against Parker's 32 / 27 / 25.5 / 21.8 / 2.4 / 2 / 14.5 / 15°: the two differ on the spotface and d4 values, so both are on record and the Parker row is the one shown. A Chinese reprint of the 2022 edition (164580.com, three rows read) agrees with Parker's M22 and M60 rows; for M8 × 1 it prints L1 = 2.2 against Parker's and the 2006 sample's 1.6. The ISO text lists the optional identification-ridge diameter d6 for all 14 sizes and gives working pressures up to 63 MPa (non-adjustable stud ends) or 40 MPa (adjustable), depending on size and material.
- O-rings: ID × W in mm from Parker's TFD O-ring sheet ('M-8 ISO O-ring' and so on). The same sheet lists M38 × 2 (34.6 × 2.9) which is not in Parker's port table, and a separate ISO 9974-1 / DIN 3852-1 metric O-ring table, which is for a different port and not used here. Other 'metric port' tables (DIN 3852-3, ISO 6149 in distributor catalogs) use other symbols and were not mixed in.
- Left out, no file: as with the SAE ports, the figure that defines the seat cone (d4, d5, Z) and the ridge did not come through in any text read, so no cavity solid is drawn.
- The metric port is the standard to use for new hydraulic designs (ISO 11926-1's own scope says so). Thread names: M12 × 1.5 means 12 mm major diameter, 1.5 mm pitch.

## Sizes

| thread d1 × P | d2 large (with ridge) | d2 small (without ridge) | d3 (ref.) | d4 | d5 | d6 | L1 | L2 (tap drill depth) | L3 | L4 (full thread) | Z ±1° | O-ring ID × W (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M8 × 1 | 17 | 14 | 3 | 12.5 | 9.1 | 14 | 1.6 | 11.5 | 1 | 10 | 12° | 6.1 × 1.6 |
| M10 × 1 | 20 | 16 | 4.5 | 14.5 | 11.1 | 16 | 1.6 | 11.5 | 1 | 10 | 12° | 8.1 × 1.6 |
| M12 × 1.5 | 23 | 19 | 6 | 17.5 | 13.8 | 19 | 2.4 | 14 | 1.5 | 11.5 | 15° | 9.3 × 2.2 |
| M14 × 1.5 (preferred for diagnostic ports) | 25 | 21 | 7.5 | 19.5 | 15.8 | 21 | 2.4 | 14 | 1.5 | 11.5 | 15° | 11.3 × 2.2 |
| M16 × 1.5 | 28 | 24 | 9 | 22.5 | 17.8 | 24 | 2.4 | 15.5 | 1.5 | 13 | 15° | 13.3 × 2.2 |
| M18 × 1.5 | 30 | 26 | 11 | 24.5 | 19.8 | 26 | 2.4 | 17 | 2 | 14.5 | 15° | 15.3 × 2.2 |
| M22 × 1.5 | 33 | 29 | 14 | 27.5 | 23.8 | 29 | 2.4 | 18 | 2 | 15.5 | 15° | 19.3 × 2.2 |
| M27 × 2 | 40 | 34 | 18 | 32.5 | 29.4 | 34 | 3.1 | 22 | 2 | 19 | 15° | 23.6 × 2.9 |
| M30 × 2 | 44 | 38 | 21 | 36.5 | 32.4 | 38 | 3.1 | 22 | 2 | 19 | 15° | 26.6 (the O-ring sheet marks M30 × 2 as not a standard ISO 6149 size, although the port table and the ISO 2006 sample list it) × 2.9 |
| M33 × 2 | 49 | 43 | 23 | 41.5 | 35.4 | 43 | 3.1 | 22 | 2.5 | 19 | 15° | 29.6 × 2.9 |
| M42 × 2 | 58 | 52 | 30 | 50.5 | 44.4 | 52 | 3.1 | 22.5 | 2.5 | 19.5 | 15° | 38.6 × 2.9 |
| M48 × 2 | 63 | 57 | 36 | 55.5 | 50.4 | 57 | 3.1 | 25 | 2.5 | 22 | 15° | 44.6 × 2.9 |
| M60 × 2 | 74 | 67 | 44 | 65.5 | 62.4 | 67 | 3.1 | 27.5 | 2.5 | 24.5 | 15° | 56.6 × 2.9 |
| M20 × 1.5 (cartridge valve cavities only, ISO 7789) | 32 | 27 | — | 25.5 | 21.8 | 27 | 2.4 | — | 2 | 14.5 | 15° | — × — |

## Where the files are

- Parker Tube Fittings Division (older 4300 edition, page U25): [Table U17: Port detail, ISO 6149-1 (metric straight thread O-ring port; SAE J2244-1 / DIN 3852-3)](https://www.goodyearrubberproducts.com/files/Parker/ParkerTubeCatalog4300/Parker%20Tube%20Catalog%204300examin1.Page476.pdf) — web — Maker catalog page; numbers only
- ISO (iTeh sample pages): [ISO 6149-1:2006 Table 1 and footnotes (port dimensions, mm)](https://cdn.standards.iteh.ai/samples/39281/b144bf21c5d340d28882ef73c1ae7d67/ISO-6149-1-2006.pdf) — web — Standards-body sample pages; numbers only
- Parker Tube Fittings Division (hosted by Wilson Company): [O-rings and seals: ORFS, SAE boss, ISO 6149, SAE 4-bolt flange O-ring sizes (ID, W)](https://wilson-company.com/images/document/TFD/O-Rings___Seals.pdf) — web — Maker catalog pages; numbers only

## Questions

**What are the dimensions of an M16 × 1.5 ISO 6149 port?**

Parker's table U17: spotface 28 (with ridge) or 24 mm (without), d4 22.5, d5 17.8, L1 2.4, tap drill depth 15.5, full thread 13 mm, Z 15°; O-ring 13.3 × 2.2 mm.

**What O-ring goes in an M22 × 1.5 port?**

19.3 × 2.2 mm (ID × section), Parker's TFD O-ring sheet; the M16 × 1.5 O-ring is 13.3 × 2.2.

**Which M-thread is preferred for diagnostic ports?**

M14 × 1.5, flagged as preferred for diagnostic port applications in both Parker's table and the ISO 6149-1:2006 sample.

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