This calculator only multiplies a selected working-load ledger by a selected comparison factor and converts metric tonnes-force to kilonewtons. It does not determine a hook rating, ultimate strength, release force or safe jaw angle.
Slip Hook · Selected Load-Multiplier Ledger
Explore selected load multiplication and tonne-force conversion without an invented hook rating or jaw-angle risk score.
Equation Used
- The load input is a metric tonne-force ledger value.
- The multiplier is selected by the user and is not a certified design factor.
- The jaw angle is a selected geometric reference only.
- Manufacturer rating, proof testing, inspection, dynamics, impact, side loading, material, wear, strength and safety are excluded.
The former ultimate-capacity label and 42–48° optimum/risk bands were removed because the inputs do not define hook structure, contact, release mechanics or a certified standard.
Illustrative pivoting release jaw
The animation shows a recognizable eye, hook body, pivoting jaw, trip lever and released ring. The selected jaw angle is mapped exactly as a reference ray at the closed pose; contact, equilibrium and release timing are not solved.
What the calculator determines
Select a working-load ledger, comparison multiplier and reference jaw angle. The calculator reports the working-load force conversion, multiplied comparison load, multiplied comparison force and selected multiplier.
Selected arithmetic only
FWLL = WLL × 9.80665 kN per metric tonne-force; Wcomparison = WLL × M; Fcomparison = Wcomparison × 9.80665.
Selected-input arithmetic
For WLL = 5 t-force and M = 5, the selected comparison load is 25 t-force, or about 245.17 kN.
Not a rigging design or rating
Actual rated capacity must come from legible manufacturer identification and applicable procedures. Hook body, pin, latch, contact, side loading, dynamics, impact, wear, defects, proof testing, inspection, material, release force and personnel safety are excluded.
Questions
Is the multiplied value an ultimate capacity?
No. It is only selected arithmetic and does not establish material strength or a certified rating.
Does the angle output approve release geometry?
No. No universal safe or optimal angle is inferred from these inputs.
References & Further Reading
- Wikipedia contributors. Pile driver. Wikipedia
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