# 5MT mainshaft locknut (NA 1.8)

Canonical URL: https://miatatorque.com/spec/mt-mainshaft-locknut-na-bp/

Applicability: NA 1994–1997 (BP, 5MT)

Confidence: fsm

95–173 ft·lb / 128–235 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": "mt-mainshaft-locknut-na-bp",
  "name": "5MT mainshaft locknut (NA 1.8)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1994,
        1997
      ],
      "engines": [
        "BP"
      ],
      "trans": [
        "5MT"
      ]
    }
  ],
  "kind": "torque",
  "torque": {
    "nm": [
      128,
      235
    ],
    "kgfm": [
      13,
      24
    ],
    "ftlb": [
      95,
      173
    ]
  },
  "procedure": {
    "notes": "Install a new locknut using SST 49 1243 465A and stake it after tightening; lock the mainshaft by engaging first and reverse as directed in the manual. 1994 factory evidence; applicability to 1995–1997 is inferred within the owner-approved NA 1.8 year group."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1994",
      "page": "J–35",
      "as_printed": "128–235 N·m {13–24 kgf·m, 95–173 ft·lbf}",
      "verified_years": [
        1994,
        1994
      ],
      "torque": {
        "nm": [
          128,
          235
        ],
        "kgfm": [
          13,
          24
        ],
        "ftlb": [
          95,
          173
        ]
      },
      "document": {
        "id": "fsm-1994",
        "tier": 1,
        "title": "1994 Mazda MX-5 Miata Workshop Manual",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1994,
              1997
            ],
            "engines": [
              "BP"
            ]
          }
        ],
        "note": "Mazda's base manual for 1994–97; later model years got supplements, which we haven't checked yet."
      }
    }
  ],
  "jobs": [],
  "system": "transmission",
  "component": "reaudit-1994",
  "componentName": "Additional 1994 factory service specifications",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/mt-mainshaft-locknut-na-bp/"
}
```