Thread identification
DIN Metric Heavy Series (S) — 24° Cone
DIN heavy-series (S) fittings share the 24° cone principle with the light series but pair thicker tube walls and different threads for high-pressure European circuits — the metric counterpart to spiral-hose duty.
Identify it
Four checks at the bench.
- 01
Metric thread, often 1.5 or 2 mm pitch, heavier hex than L-series
- 02
24° cone; DKOS hose ends carry the O-ring cone nose
- 03
Match thread to tube OD on the S-series chart (thread ≈ tube OD + 8 mm)
- 04
Pressure class on the union body often reads 400–630 bar
Don't confuse it with…
- L-series threads on adjacent sizes overlap (M16×1.5 is 10L *and* 8S) — always confirm with the tube OD
- JIC conversions need dedicated adapters; the cone angles (24° vs 37°) never interchange
Reference
Size chart.
| Size | Thread |
|---|---|
| 6S (6 mm tube) | M14×1.5 |
| 8S | M16×1.5 |
| 10S | M18×1.5 |
| 12S | M20×1.5 |
| 16S | M24×1.5 |
| 20S | M30×2 |
| 25S | M36×2 |
A1 stocks it.
- DIN Metric Heavy (DKOS) 24° FemaleA1-WB-DKOS
- Interlock DIN Heavy (DKOS) FemaleA1-4S-DKOS
- 6-Spiral Interlock DKOS FemaleA1-6S-DKOS
- Metric ↔ JIC Adapter SeriesA1-FA-MJIC
Unsure even after the checks? Bring the fitting to the counter — gauging an unknown thread takes us about a minute. (817) 589-7101.
DIN Metric Heavy Series (S) — 24° Cone — FAQs
Why does M16×1.5 appear in both L and S charts?
Thread diameter alone doesn't define a DIN fitting — the series pairs thread with tube OD and wall. M16×1.5 is 10L or 8S; the mating union decides.
Can A1 build hoses with DKOS ends?
Yes — light and heavy metric O-ring cone ends are stocked for braid and spiral hose, including interlock versions for 4- and 6-spiral.