Enter the thread or a designation. Without a designation, enter the measured outside diameter with the pitch in mm or the threads per inch (a value of 5 or more is read as threads per inch), or the diameter of the entry hole. Below, an offered gland can be checked against it: the same thread or not.
On the thread alone: the clamping range, the material, the IP rating and the Ex certification are checked against the maker’s data.
Cable glands and conduit fittings screw into an entry in a junction box, a motor terminal box, a light fitting or a control panel, and on older equipment that entry is often PG. Enter the thread (PG 13.5, M25 × 1.5, 1/2 NPT), a measured outside diameter with the pitch or threads per inch, or the diameter of the entry hole in the enclosure wall: the tool gives the thread with its outside diameter and pitch where the sources agree, draws it, notes the metric replacement for a PG size where two sources name the same one, checks an offered gland and writes an RFQ line.
The entry hole size and the clamping range are not given: the makers’ tables differ on the hole, and the clamping range belongs to each gland and seal insert. Give the cable outside diameter in the request.
PG (Panzergewinde, the steel conduit thread) is the old German thread with an 80° flank angle. The number names the size and is not a diameter: PG 13.5 measures 20.4 mm across the thread. PG 7 has 20 threads per inch, PG 9 to PG 16 have 18, PG 21 to PG 48 have 16.
Cable glands to EN 62444 (EN 50262) use the metric fine thread of EN 60423: M12 to M63 with a 1.5 mm pitch, named by the outside diameter in mm. If a gland is marked only “M25”, measure the pitch to confirm 1.5 mm.
NPT entries are found on equipment built to North American practice. The thread is tapered, so a measured diameter depends on where along the thread it is taken. The size is the nominal pipe size: 1/4 NPT and 3/8 NPT have 18 threads per inch, 1/2 NPT and 3/4 NPT 14, 1 NPT to 2 NPT 11.5.
| Thread | Outside diameter, mm | Pitch, mm | Threads per inch | Nearest replacement |
|---|---|---|---|---|
| PG 7 | 12.5 | 1.27 | 20 | — |
| PG 9 | differ (15.2–15.5) | 1.41 | 18 | — |
| PG 11 | 18.6 | 1.41 | 18 | — |
| PG 13.5 | 20.4 | 1.41 | 18 | M20 × 1.5 |
| PG 16 | 22.5 | 1.41 | 18 | — |
| PG 21 | 28.3 | 1.588 | 16 | — |
| PG 29 | 37 | 1.588 | 16 | — |
| PG 36 | 47 | 1.588 | 16 | — |
| PG 42 | 54 | 1.588 | 16 | — |
| PG 48 | 59.3 | 1.588 | 16 | — |
| M12 × 1.5 | 12 | 1.5 | — | — |
| M16 × 1.5 | 16 | 1.5 | — | — |
| M20 × 1.5 | 20 | 1.5 | — | PG 13.5 |
| M25 × 1.5 | 25 | 1.5 | — | — |
| M32 × 1.5 | 32 | 1.5 | — | — |
| M40 × 1.5 | 40 | 1.5 | — | — |
| M50 × 1.5 | 50 | 1.5 | — | — |
| M63 × 1.5 | 63 | 1.5 | — | — |
| 1/4 NPT | differ (13.6–13.716) | 1.41 | 18 | — |
| 3/8 NPT | differ (17–17.145) | 1.41 | 18 | — |
| 1/2 NPT | differ (21.2–21.336) | 1.81 | 14 | — |
| 3/4 NPT | differ (26.5–26.67) | 1.81 | 14 | — |
| 1 NPT | differ (33.2–33.401) | 2.21 | 11.5 | — |
| 1 1/4 NPT | differ (41.9–42.164) | 2.21 | 11.5 | — |
| 1 1/2 NPT | differ (48–48.26) | 2.21 | 11.5 | — |
| 2 NPT | differ (60–60.325) | 2.21 | 11.5 | — |
All dimensions in millimetres. A figure is given only where at least two sources state it and none of the consulted ones states another value. “Differ”: the outside diameter of PG 9 is 15.2 mm in most tables and 15.5 mm in one; for NPT, two tables give the pipe outside diameter and a third a slightly smaller gland thread diameter, so a measurement is matched against the range between them. No entry hole is given: the makers’ tables differ by 0.1 to 0.8 mm for each size. Only PG 13.5 → M20 × 1.5 is named as a replacement by two sources; for the other PG sizes the conversion tables consulted name different metric sizes, or only one names the pair.
The thread is only the enclosure side of a gland. On the cable side the clamping range counts: it is maker-specific and comes from the maker’s data for the gland chosen. An armoured cable needs a gland that terminates the armour; a gland in a hazardous area needs its own Ex certification, matched to the enclosure. Give all of this in the request, with the cable outside diameter.
Outside diameters and pitches: the thread and bore tables of two cable gland makers, a third maker’s size chart, a hose maker’s thread standards table (EN 60423, DIN 40430, ANSI/ASME B1.20.1), and the DIN 40430 tables of the English and German Wikipedia and of a thread standards reference site. The PG 13.5 → M20 × 1.5 replacement: the conversion table of that reference site and an instrument maker’s note on the change from PG to metric glands. The change from PG 7–PG 48 to M12–M63: the catalogues of two cable gland makers.
No. PG 13.5 measures 20.4 mm across the thread with 18 threads per inch and an 80° flank; M20 × 1.5 measures 20 mm with a 1.5 mm pitch and a 60° flank. They are close enough to start in each other’s entry and then bind or leak, so check the pitch before fitting one. M20 × 1.5 is the size two of the sources name as the replacement for PG 13.5 on a new or re-cut entry.
Measure the outside diameter of the gland thread with a caliper and count the threads over 10 mm or over one inch. A metric gland thread has 1.5 mm from crest to crest; PG 7 has 20 threads per inch, PG 9 to PG 16 have 18 and PG 21 to PG 48 have 16. If only the enclosure is left, measure the entry hole: it is drilled a little over the thread’s outside diameter, and the tool lists the threads that fit it.
The gland makers’ tables used here give different entry holes for the same thread, by 0.1 to 0.8 mm (for M20 × 1.5, 20.2 or 20.3 mm), and one gives a range. This tool keeps a figure only where two sources agree and none states another value, so the hole is left out: take it from the drawing of the gland or the enclosure.
The clamping range is the cable outside diameter a gland seals and holds. It is maker-specific and differs between seal inserts of the same thread, so no range is given here. Measure the cable outside diameter over the outer sheath, and over the inner sheath as well on an armoured cable, and give it in the request; the gland is chosen against the maker’s data.
The thread (for example M25 × 1.5 or PG 16), the gland material (brass, nickel-plated brass, stainless steel or polyamide), the cable outside diameter, the IP rating, whether Ex certification is needed and which, whether the cable is armoured, the quantity, and a photograph of the old gland and the entry.
A row of this table is a cross-check of the thread, not a gland selection. Attach a photograph of the gland and the entry with the cable outside diameter, and Vessel Core checks them before an offer goes back.
