Showing specs for all NA & NB Miatas

Clutch disc lining above rivet head — minimum

0.3 mm (0.012 in), minimum

Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure

Measure the lining above a rivet head on each side using vernier calipers. This is not total disc thickness. Replace the disc if below minimum.

Applies to
  • NB 2001–2005 (BP-Z3, 5MT/6MT) — Other years in this family inferred from 2005 factory evidence with owner approval; actual-year verification is separate.
  • Verified in: 2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture)
Sources
  • 2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture)Tier 1
    Page PDF p. 1498
    Printed: “Measure the thickness of the lining at a rivet head on both sides using vernier calipers. Replace the clutch disc if less than minimum. Minimum thickness 0.3 mm {0.012 in}”

Also in Additional factory manual gap audit