# Automatic torque converter clutch solenoid bolt (NB1)

Canonical URL: https://miatatorque.com/spec/at-torque-converter-clutch-solenoid-bolt-nb1/

Applicability: NB 1999–2000 (BP-4W, 4AT) — 2000 applicability inferred from 1999 factory evidence within the owner-approved NB1 group.

Confidence: fsm

44–52 in·lb / 5–5.8 N·m

Always confirm against your factory manual. Match every restriction and follow all stages and procedure notes. Disputed claims must not be automatically resolved. The complete record below preserves every printed unit, source claim and procedure.

```json
{
  "id": "at-torque-converter-clutch-solenoid-bolt-nb1",
  "name": "Automatic torque converter clutch solenoid bolt (NB1)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        1999,
        2000
      ],
      "engines": [
        "BP-4W"
      ],
      "trans": [
        "4AT"
      ],
      "note": "2000 applicability inferred from 1999 factory evidence within the owner-approved NB1 group."
    }
  ],
  "kind": "torque",
  "torque": {
    "nm": [
      5,
      5.8
    ],
    "kgfcm": [
      50,
      60
    ],
    "inlb": [
      44,
      52
    ]
  },
  "procedure": {
    "notes": "Apply ATF to a new O-ring before installation."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1999",
      "page": "05–13–17",
      "as_printed": "B: 5.0–5.8 N·m\n{50–60 kgf·cm, 44–52 in·lbf}",
      "verified_years": [
        1999,
        1999
      ],
      "torque": {
        "nm": [
          5,
          5.8
        ],
        "kgfcm": [
          50,
          60
        ],
        "inlb": [
          44,
          52
        ]
      },
      "document": {
        "id": "fsm-1999",
        "tier": 1,
        "title": "1999 Mazda MX-5 Miata Workshop Manual",
        "covers": [
          {
            "gen": "NB",
            "years": [
              1999,
              2000
            ],
            "engines": [
              "BP-4W"
            ]
          }
        ],
        "url": "https://www.mellens.net/mazda/Mazda-Miata-1999-2001.pdf"
      }
    }
  ],
  "jobs": [],
  "system": "transmission",
  "component": "reaudit-1999",
  "componentName": "Additional NB1 automatic service fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/at-torque-converter-clutch-solenoid-bolt-nb1/"
}
```