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The seal is rated for a cable diameter range, not for a hole

The best cable glands for 2026

A gland is what lets a cable pass through a wall, a roof or an enclosure without letting water follow it, and it is specified by two numbers that are easy to confuse. The thread size — M16, M20, PG11 and their neighbours — is the hole it fits; the clamping range is the cable diameter it seals, and a cable thinner than the range is not held, while a thicker one does not close. Both are printed, and both have to be read. The ingress rating is achieved only when the gland is tightened onto a cable inside that range and fitted with its seal and locknut; the rating on the box assumes correct installation. Material decides the life outdoors: polyamide is cheap and, unless UV-stabilised, becomes brittle in a few summers; brass and stainless last longer and conduct, which matters where earthing is involved. The temperature range matters on a roof. Whether a locknut and a sealing washer are included is a small thing that decides whether the parts drawer is complete. We compare thread size, clamping range, ingress rating, material and UV resistance, temperature range and supplied parts.

Every part on this shelf, side by side

  1. HB-DIGITAL M20 IP68 cable glands with locknuts

    HB-DIGITAL Ten M20 glands for 6–12 mm cable, IP68

    Ten M20 cable glands for 6 to 12 mm cable, rated IP68, in UV-resistant flame-retardant plastic with rubber seals, clamping lamellae and locknuts.

    Thread size
    M20, from the title
    Clamping range
    6 to 12 mm cable diameter, from the title
    Ingress rating
    IP68 — dust-tight and rated for continuous immersion, first bullet
    Material
    Weatherproof, flame-retardant plastic, third bullet
    UV resistance
    Stated in the third bullet
    Temperature range
    Nowhere in the listing
    Supplied parts
    Gland, rubber seal, locknut and clamping lamellae, from the title
    Amazon reference
    B09V5N4LWB (same reference on 5 Amazon marketplaces)
    EAN
    4063328036508
    • IP68 rather than IP67, which covers continuous immersion rather than temporary
    • Locknuts and clamping lamellae both included, which are what the seal actually depends on
    • No temperature range

    Best for: A junction box on a roof or in the ground where water is a certainty.

    ≈ €6
    Check price on Amazon
  2. SeKi M20 polyamide cable glands in black with locknuts

    SeKi Ten M20 × 1.5 glands for 7–12 mm cable, polyamide, IP67

    Ten M20 × 1.5 polyamide cable glands for 7 to 12 mm cable with locknuts, rated IP67, 35 mm long with 24 and 27 mm spanner flats.

    Thread size
    M20 × 1.5, first bullet — the thread pitch is published, which the other gland here omits
    Clamping range
    7 to 12 mm cable diameter, first bullet
    Ingress rating
    IP67, fourth bullet
    Material
    Polyamide, halogen-free and silicone-free, third bullet, with resistance to oils, bases, greases and chlorinated solvents, and limited resistance to acids
    UV resistance
    Nowhere in the listing
    Temperature range
    Nowhere in the listing
    Supplied parts
    Gland and locknut; overall length 35 mm, spanner flats 24 and 27 mm, second and fifth bullets
    Amazon reference
    B083V9515G (same reference on 6 Amazon marketplaces)
    EAN
    4053171977653
    • The material is named — polyamide — with its chemical resistances and its one weakness listed
    • Overall length and spanner sizes published, which decide whether it fits a crowded box
    • IP67 rather than IP68

    Best for: An enclosure where the gland has to be tightened with a spanner in a confined space.

    ≈ €7
    Check price on Amazon

A price quoted in the text of a PowerVerdict page dates from the day that page was written; the live figure beside each product is fetched while you read and replaces it.