Source: https://guthlabs.ai/docs/instruments/bolt-group-eccentric-fastener-pattern-solver/qualification/

instrument qualification / verified-with-binding-errata

# Bolt Group / Eccentric Fastener Pattern Solver qualification

Verified with errata that must be applied at binding time.

Status: **VERIFIED_WITH_ERRATA**Lifecycle: **verified-with-binding-errata**

## Ledger verdict

Verified with errata that must be applied at binding time.

**Status**: VERIFIED_WITH_ERRATA

**Tranche**: tranche-6

**Review vectors**: 4

**Ledger rows**: 1

## Applied errata

````
[
  {
    "vector": "1,2,3",
    "field": "per_bolt_resultants/magnitudes (and J in v3)",
    "wrong": "near-side bolts 1000 N / far-side 2236 N (v1); [0,2000] (v2); J=4, 901.39 (v3)",
    "correct": "torsional force = (M/J)*(-y, x): near-side bolts carry 2236 N, far 1000 N (v1); [2000,0] (v2); J=Σ(x²+y²)=8, mags [559.0,559.0,250,250]-family recompute (v3)",
    "cause": "systematic: torsional shear direction transposed (F_t=(My/J,-Mx/J) instead of (M/J)(-y,x)) — physically backwards (bolts nearer the eccentric load must carry MORE); v3 additionally computes J as Σx² only"
  }
]
````

## Adversarial re-test context

The full catalog was re-tested from boundary, convention, and self-check angles in 2,787 requests. Five genuine computational defects were independently verified and corrected. This page reports the current ledger state for this instrument; it does not imply product deployment or interface qualification.

## Release gate

Bind every attached correction, replay the affected vectors, enforce boundary validation, and preserve evidence before describing the executable surface as qualified.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/bolt-group-eccentric-fastener-pattern-solver/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/bolt-group-eccentric-fastener-pattern-solver/mechanism/>)[03**Implementation**](<https://guthlabs.ai/docs/instruments/bolt-group-eccentric-fastener-pattern-solver/implementation/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `STRESS_TEST_RECEIPT.json`

- `tranche errata record`