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Fori di passaggio ISO 273 per bulloni e viti, da M1,6 a M64

Il diametro del foro di passaggio per un bullone o una vite metrica, in tre serie: fine, media e grossa.

FilettaturaSerie Fine (mm), H12Serie Media (mm), H13Serie Grossa (mm), H14
M1.61,71,82
M1.822,12,2
M22,22,42,6
M2.52,72,93,1
M33,23,43,6
M3.53,73,94,2
M44,34,54,8
M4.54,855,3
M55,35,55,8
M66,46,67
M77,47,68
M88,4910
M1010,51112
M121313,514,5
M141515,516,5
M161717,518,5
M18192021
M20212224
M22232426
M24252628
M27283032
M30313335
M33343638
M36373942
M39404245
M42434548
M45464852
M48505256
M52545662
M56586266
M60626670
M64667074

ISO 273:1979, clause 2, table: thread diameter d and clearance hole d_h, series fine / medium / coarse

Classi di tolleranza: ISO 273:1979, clause 2, note below the table: tolerance fields given for information only, for use where it is desirable to specify tolerances

Note del file di dati

  • Default series: medium. ISO 273:1979 does not name a default series; medium is the usual choice for general-purpose bolted joints and is MechPilot's own choice. The user can switch to fine or coarse per hole.
  • ISO 273:1979, clause 1: the values are for general-purpose applications and come from bearing-area calculations with the ISO bolt and nut product standards; clearance holes for special applications are chosen from the design requirements.
  • ISO 273:1979, clause 2, last note: where the edge of the hole would interfere with the underhead fillet of the bolt, a chamfer is recommended.

Fonte e verifica

Le citazioni dal file di dati sono in inglese, come sono scritte lì.

Norma
ISO 273:1979 Fasteners - Clearance holes for bolts and screws, clause 2 (Dimensions, table of clearance hole diameters d_h for the fine, medium and coarse series)
Verifica
primary (è stato visto il testo stesso della norma)
Verificato su
Note sulla verifica
  • Every diameter below was read from the table in ISO 273:1979 clause 2 (IS 1821:1987, an identical adoption). The national foreword uses the decimal point; the table itself uses the decimal comma.
  • ISO 273:1979 lists thread diameters from 1 mm to 150 mm. MechPilot stores M1.6 to M64; M1, M1.2, M1.4 and M68 to M150 are in the standard but not stored here (not needed by the kernel yet).
File di dati
library/holes/iso-273.json

I valori che non è stato possibile verificare sulla norma sono omessi ed elencati in docs/to-verify.md. Controllate la norma stessa prima di affidarvi a un valore in produzione, e segnalate ogni errore su GitHub. to-verify.md · Issue