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Rope specs

Beta

Typical nylon kernmantle and 1″ tubular nylon. Knotted MBS is this app's working number. Working Load Limit (WLL) is the most acceptable in use: knotted MBS ÷ 10. That is a field convention, not the manufacturer’s published WLL. Do not use these numbers for polyester, Dyneema/HMPE, or aramid.

  • 7 mm

    rope

    MBS
    10 kN
    Knotted
    7 kN
    WLL
    0.7 kN

    Accessory cord. Prusiks, backups — not a life-safety mainline.

  • 8 mm

    rope

    MBS
    15 kN
    Knotted
    10 kN
    WLL
    1.0 kN

    Prusik cord on 11–12.5 mm host rope. Typical 3-wrap grip.

  • 9 mm

    rope

    MBS
    20 kN
    Knotted
    15 kN
    WLL
    1.5 kN

    Not NFPA life-safety rope (minimum diameter 9.5 mm). Confirm manufacturer and AHJ before any life-support use.

  • 11.1 mm

    rope

    MBS
    30 kN
    Knotted
    20 kN
    WLL
    2.0 kN

    Typical nylon ~30 kN MBS. NFPA Technical-use is MBS ≥ 20 kN at 9.5–12.5 mm — class is the label on the coil, not the diameter. This app's WLL is 2 kN at 10:1 knotted.

  • 12.5 mm

    rope

    MBS
    40 kN
    Knotted
    30 kN
    WLL
    3.0 kN

    Typical nylon. NFPA General-use minimum is 40 kN MBS (11–16 mm). Class is the label, not the diameter. This app's WLL is 3 kN at 10:1 knotted.

  • 25 mm web

    webbing

    MBS
    17.8 kN
    Knotted
    9 kN
    WLL
    0.9 kN

    1 in tubular nylon (mil-spec ≈ 4,000 lbf). Water knot ~50%. Do not shock-load.

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