PG and Metric Cable Gland Size Chart (PG7–PG48 / M12–M63) and Flexible Conduit Matching
Thread diameter, panel hole size and cable clamping range for PG7–PG48 and M12–M63 cable glands, PG to metric equivalents and flexible conduit nominal size matching.
A cable gland seals (IP rating) and anchors a cable where it enters a panel or device. The right gland is chosen from two dimensions: the cable outer diameter (clamping range) and the hole or thread size in the enclosure (`PG` or metric `M`). Gland requirements are defined in EN 62444; the charts below give PG and metric dimensions and flexible conduit matches.
> Related Category: Browse models by thread and material in Cable Glands, Spiral Conduit Fittings and Spiral Conduits.
1. PG gland size chart (PG7–PG48)
The PG (Panzergewinde) thread is the former German standard (DIN 40430) with an 80° profile; the number is not a dimension.
| PG size | Thread outer diameter (mm) | Panel hole (mm) | Typical cable clamping range (mm) |
|---|---|---|---|
| PG7 | 12.5 | 12.7–13 | 3–6.5 |
| PG9 | 15.2 | 15.4–15.7 | 4–8 |
| PG11 | 18.6 | 18.8–19 | 5–10 |
| PG13.5 | 20.4 | 20.6–21 | 6–12 |
| PG16 | 22.5 | 22.7–23 | 10–14 |
| PG21 | 28.3 | 28.5–29 | 13–18 |
| PG29 | 37.0 | 37.2–37.5 | 18–25 |
| PG36 | 47.0 | 47.2–47.5 | 22–32 |
| PG42 | 54.0 | 54.2–54.5 | 30–38 |
| PG48 | 59.3 | 59.5–60 | 34–44 |
2. Metric gland size chart (M12–M63)
On metric glands (EN 60423) the number is the thread outer diameter and the pitch is 1.5 mm for every size; this is the standard series for new equipment.
| Metric size | Thread outer diameter (mm) | Panel hole (mm) | Typical cable clamping range (mm) | Approximate PG equivalent |
|---|---|---|---|---|
| M12×1.5 | 12 | 12.2–12.5 | 3–6.5 | PG7 |
| M16×1.5 | 16 | 16.2–16.5 | 4–8 | PG9 |
| M20×1.5 | 20 | 20.2–20.5 | 6–12 | PG11, PG13.5 |
| M25×1.5 | 25 | 25.2–25.5 | 11–17 | PG16 |
| M32×1.5 | 32 | 32.2–32.5 | 15–21 | PG21 |
| M40×1.5 | 40 | 40.2–40.5 | 19–28 | PG29 |
| M50×1.5 | 50 | 50.2–50.5 | 27–35 | PG36 |
| M63×1.5 | 63 | 63.2–63.5 | 34–45 | PG42, PG48 |
- Clamping ranges vary by a few millimetres with maker and seal type; the range on the product label governs.
- PG and metric threads do not mate: profile angle (80° vs 60°) and pitch differ. A different series fits a threaded entry only with an adapter or reducer; in a plain hole either series works with a locknut.
- Choose the size where the cable sits in the middle of the clamping range; at the lower limit the seal does not grip, at the upper limit the cap nut will not start.
3. Material and protection rating
| Material | Operating temperature | Use |
|---|---|---|
| Polyamide (PA6) | −20 … +80 °C | General panels and machines; grey or black (black is UV resistant) |
| Nickel-plated brass | −40 … +100 °C | Vibrating machinery, metal enclosures, oily areas |
| Stainless steel | −40 … +100 °C | Food, chemical and marine environments |
| EMC gland | — | 360° screen bonding of screened motor and drive cables |
Standard glands reach IP68 when tightened correctly. The rating holds only with the face seal and the right hole size; see the IP20–IP68 and IK Rating Chart. Use multi-hole seals for several thin cables and blind plugs for unused entries.
4. Matching flexible conduit to glands
Plastic (polyamide, polypropylene) corrugated spiral conduits are named by nominal width (NW); the fitting is chosen by the conduit outer diameter.
| Nominal width (NW) | Inner diameter (mm) | Outer diameter (mm) | Metric fitting | PG fitting |
|---|---|---|---|---|
| 7.5 | 6.5 | 10 | M12 | PG7 |
| 10 | 10 | 13 | M16 | PG9 |
| 12 | 12 | 15.8 | M16, M20 | PG11 |
| 17 | 16.5 | 21.2 | M20, M25 | PG16 |
| 23 | 23 | 28.5 | M25, M32 | PG21 |
| 29 | 29 | 34.5 | M32, M40 | PG29 |
| 36 | 36 | 42.5 | M40, M50 | PG36 |
| 48 | 48 | 54.5 | M50, M63 | PG48 |
- Conduit does not go into a standard cable gland; it needs a spiral conduit fitting that grips the corrugations.
- The cable bundle should not exceed about 70% of the inner diameter, otherwise cables cannot be pulled and run hot.
- Steel and galvanized flexible conduits are sold by inner diameter or inch size and pair with brass fittings of their own series.
- For cable fixing see the Cable Clip and Cable Tie Sizing Guide.
Frequently asked questions
Which metric size matches a PG13.5 gland?
M20×1.5. PG13.5 has a 20.4 mm thread and M20 a 20 mm thread; cable ranges are similar but the threads do not screw together.
What hole size is drilled for an M20 gland?
20.2–20.5 mm. Metric gland holes are 0.2–0.5 mm over nominal; an oversized hole lets the seal leak.
What cable diameter fits a PG11 gland?
The typical clamping range is 5–10 mm. A 3×1.5 mm² flexible cable of about 8 mm fits PG11 or M20.
What is the difference between PG and metric glands?
PG is the older German thread and its number is not a dimension; on metric glands the number is the thread diameter and the pitch is always 1.5 mm. New equipment uses metric; PG is mostly needed as a spare for older machines.
Which fitting goes on flexible conduit?
A conduit fitting matching the conduit outer diameter. For example NW17 conduit (21.2 mm outer diameter) takes an M20 or M25 threaded fitting.