A DIN 3015 designation looks cryptic — DIN 3015-2 · 25 · PP · W1 — but it is just six ordered fields. Read them left to right and you have the complete clamp specification: part, pipe size, material, hardware and coating. This page decodes each field so you can read an existing part number or write a complete one for an RFQ.
A DIN 3015 designation is read left to right in six fields: standard and part (e.g. DIN 3015-2 = heavy series), nominal pipe outside diameter in mm (e.g. 25), the series or group letter, the body/insert material (e.g. PP, PA, or W1/W4/W5 for stainless), the cover-plate and rail type, and the surface coating. Example: DIN 3015-2 · 25 · PP · W1 means a heavy-series double-bolt clamp for 25 mm OD pipe, polypropylene insert, carbon steel hardware. The single most important field is pipe OD — the measured outer diameter in mm, not DN and not NPS.
- Best for
- Engineers and buyers decoding an existing DIN 3015 part number or writing a complete one before an RFQ
- Not suitable for
- Assuming pipe OD equals nominal bore (DN) — always use the measured outer diameter in mm
- Selection steps
- 1 — Identify the part (1 or 2) → 2 — Read pipe OD in mm → 3 — Read body/insert material code → 4 — Read hardware and rail → 5 — Read coating
- RFQ information
- Standard and part, pipe OD, body material, insert compound, hardware material, coating, certification, quantity
§ 01 — The Full String
A complete ordering designation contains, in order, the standard and part, the pipe OD, the body/insert material, and the hardware/coating. A typical manufacturer string reads:
which is a heavy series (Part 2) clamp for 25 mm OD pipe, with a polypropylene insert, carbon-steel hardware (W1), finished in zinc-flake (Geomet). Field order can vary slightly between catalogues, but the fields themselves are always the same six.
§ 02 — Field by Field
| Field | What it means | Typical values |
|---|---|---|
| Standard + Part | DIN 3015 and which part — Part 1 (single bolt, light) or Part 2 (double bolt, heavy) | DIN 3015-1, DIN 3015-2 |
| Pipe OD | Measured outer diameter of the pipe in mm — the most critical field | 6, 8, 10 … 76.1 |
| Body / insert material | The polymer or metal insert that grips the pipe | PP, PA, AL, or W-codes |
| Hardware group | Cover plate, weld plate and bolt material group | W1, W4, W5 (see below) |
| Coating | Surface finish of the steel hardware | HDG, Geomet, Dacromet, passivated |
| Certification (optional) | Material test certificate level if required | 2.2, 3.1 (EN 10204) |
§ 03 — Material & Hardware Codes
The "W" group codes describe the metal-parts material, which is what determines corrosion class. The polymer insert code is separate.
| Code | Hardware material | Corrosion class | Typical use |
|---|---|---|---|
| W1 | Carbon steel | Coating-dependent | Onshore, coated (HDG / zinc-flake) |
| W4 | Stainless 304 (1.4301 / A2) | C3–C4 | Coastal, hub interior |
| W5 | Stainless 316L (1.4404 / A4) | C5 / CX | Offshore nacelle and tower |
| Insert code | Material | Use |
|---|---|---|
| PA | Polyamide (PA66-GF) — default | General, high mechanical load |
| PP | Polypropylene | Chemical resistance, coolant |
| AL | Aluminium | High temperature, EMC |
§ 04 — Worked Examples
| Designation | Decoded |
|---|---|
| DIN 3015-1 · 12 · PA · W1 · HDG | Light series, 12 mm OD, polyamide insert, carbon steel, hot-dip galvanized — a typical onshore pneumatic line clamp |
| DIN 3015-2 · 25 · PP · W5 · passivated | Heavy series, 25 mm OD, PP insert, 316L stainless, passivated — an offshore cooling circuit clamp |
| DIN 3015-2 · 38 · PA · W1 · Geomet | Heavy series, 38 mm OD, polyamide insert, carbon steel, zinc-flake — a high-vibration nacelle hydraulic clamp |
§ 05 — Common Mistakes
- Using DN or NPS instead of OD. DIN 3015 sizes by measured outer diameter in mm. A "DN20" pipe is not "20 mm OD" — confirm the actual OD before ordering.
- Omitting the part. "DIN 3015 · 25" is ambiguous — Part 1 and Part 2 are different clamps. Always state the part.
- Confusing insert body with lining compound. "PP" is the body; "EPDM" is the elastomer. A coolant clamp needs both specified.
- Leaving coating blank on carbon steel. W1 without a coating is unprotected steel — always pair W1 with HDG, Geomet or Dacromet.
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