Rigging Hardware — Hook Loading Position
Hook Loading Position capacity check with the standard derating rules applied.
Hooks are rated at the bowl — the lowest point — where the load path runs through the thick back. Tip loading bends the hook open like a paperclip and can halve capacity or worse. Throat-opening growth (>5% vs new, per B30.10) is the fingerprint of past tip-loading; measure it at inspection.
Formula
Note: Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
Hook Loading Position capacity check with the standard derating rules applied. A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Rigging Hardware — Hook Loading Position
Rigging Hardware — Hook Loading Position computes the governing relationship Bowl seat 100% · mid-hook ~70% · tip loading ~40% (maker-dependent) live as you type. Hooks are rated at the bowl — the lowest point — where the load path runs through the thick back. Tip loading bends the hook open like a paperclip and can halve capacity or worse. Throat-opening growth (>5% vs new, per B30.10) is the fingerprint of past tip-loading; measure it at inspection. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Rigging Hardware — Hook Loading Position
- 1Enter your values — Hook WLL (bowl seat), Load position (1 bowl · 2 mid · 3 tip) (sensible defaults are pre-filled).
- 2Read the live results: Effective capacity.
- 3Check the "with your numbers" line to see Bowl seat 100% · mid-hook ~70% · tip loading ~40% (maker-dependent) substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Rigging Hardware — Hook Loading Position?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula Bowl seat 100% · mid-hook ~70% · tip loading ~40% (maker-dependent) with authoritative sources cited on the page (ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices; Wire Rope Technical Board — Wire Rope Users Manual, 4th ed.)
- ✓Hooks are rated at the bowl — the lowest point — where the load path runs through the thick back.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the rigging hardware — hook loading position use?+
It evaluates Bowl seat 100% · mid-hook ~70% · tip loading ~40% (maker-dependent), exactly as published. Sources: ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices; Wire Rope Technical Board — Wire Rope Users Manual, 4th ed.. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Hooks are rated at the bowl — the lowest point — where the load path runs through the thick back. Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
When is this calculator the right tool for the job?+
Hook Loading Position capacity check with the standard derating rules applied. A free crane load, wind & rigging safety tool. Tip loading bends the hook open like a paperclip and can halve capacity or worse. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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