M12 × 1.75 M profile Internal Thread Specifications

M12x1.75-6H

ASMESTD: ASME B1.13MSOURCE: Table 15 · p. 35TYPE: Internal (nut/tapped hole)CLASS: 6HSERIES: M coarse (Table 4)1st choice (Table 6, p. 9) · standard size
Major diameter
12.000 min
max 12.452 (reference)
Pitch diameter
10.863 – 11.063
min – max
Minor diameter
10.106 – 10.441
min – max
Fundamental deviation
EI 0.000
pitch 1.75 mm · position H

Thread profile

M12x1.75-6H: internal M profile with its tolerance zone, drawn to scaleD = 12.000D2 = 10.863D1 = 10.106P = 1.7560°30°crest P/4 = 0.437500root P/8 = 0.218750Major dia (root)12.000 min (12.452 max ref.)Pitch dia zone (flanks)10.863 – 11.063 TD2 0.200Minor dia zone (crests)10.106 – 10.441 TD1 0.335Fundamental deviationEI = 0, position HH/80.1894433H/80.568329H/40.378886h = 5H/80.947215H1.515544thread axis, 6.000 mm below the major radius (diameters shortened)FEMALE · internal thread · M12x1.75-6H

M12x1.75-6H: solid line = maximum material profile, dashed = minimum material, hatched = tolerance zone (Figs. 8 and 9), grey dashed = basic profile (Fig. 1). Drawn to scale; values in mm, diameters shortened.

Limits of size, class 6H

DimensionBasicMaxMinTolerance
Major diameter DRoot of the internal thread; max is for tool design only12.00012.452ref.12.0000.452ref.
Pitch diameter D2Sets the fit10.86311.06310.8630.200
Minor diameter D1Crest of the internal thread (the bore)10.10610.44110.1060.335
Deviations, pitch diameter ES / EIUpper and lower deviation from the basic pitch diameter (Fig. 4)—+0.2000.000—
Deviations, minor diameter ES / EICrest diameter—+0.3350.000—

Dimensions in millimetres. Values are those of the standard (ASME B1.13M); calculated cells follow the standard’s formulas. Where the standard prints a value that differs from its formula, the printed value is shown with a note.

Tolerance zones relative to the basic size, mm (Fig. 4)

Tolerance zones relative to the basic sizezero line = basic size+ above · − belowD2ES +0.200EI 0.000female pitch diaD1ES +0.335EI 0.000female minor dia (crest)

Lead, flank angle and length of engagement

Allowable lead variation ±δP
0.058 mmOver the length of engagement
Equivalent change in functional diameter δd2
0.100 mmHalf the pitch diameter tolerance
Allowable half-angle variation ±δα
1° 35′ Each 30° flank angle
Length of engagement, normal LE
6.0 – 18.0 mmShort up to / long over: see all values
Lead source: Table 17, p. 47; half-angle source: Table 18; length of engagement: Table 7

Notes

  • Standard internal class, no allowance (para 5.5.2); ~ inch 2B.

Mates

M12x1.75-6H takes a thread of the same standard at the same size and pitch. The standard mating external thread is class 6g. Check the fit with the standard pair →

Working out the mating options…

Different pitch or a different thread family never mate; the fit check runs over both tolerance zones.

Related thread sizes

Same diameter other pitch, and neighbouring sizes

→ M12 × 1 mm→ M12 × 1.25 mm→ M12 × 1.5 mm→ M11 × 1.5 mm→ M14 × 1 mm→ M12 × 1.75 external→ ISO metric M12x1.75 internal
All values for M12x1.75-6Hevery column of the workbook row
All values of the workbook row M12x1.75-6H
DesignationM12x1.75-6H
Alternate designation (all capitals, para 7.2.3)M12X1.75-6H INT
Pitch in designation1.75
Thread formM
SeriesCoarse
Series nameStandard coarse pitch series (Table 4)
External / internalInternal
Class6H
Nominal sizeM12
Pitch P (mm)1.75
Basic major dia D, d (mm)12.000
Size category1st choice (Table 6, p. 9) · standard size
Source tableTable 15
Printed page35
Thread typeM coarse (Table 4)
Tolerance position, pitch diaH
Tolerance grade, pitch dia6
Tolerance position, crest diaH
Tolerance grade, crest dia6
Fundamental deviation es / EI, pitch dia (mm)0.000
Fundamental deviation es / EI, crest dia (mm)0.000
Allowance |es| / EI (mm)0.000
Major dia max (mm)12.452
Major dia min (mm)12.000
Major dia tolerance Td (mm)0.452
Major dia statusD min toleranced; D max for reference (para 9.3.1(d), Table 15 note 2)
Basic pitch dia D2, d2 (mm)10.863
Pitch dia max (mm)11.063
Pitch dia min (mm)10.863
PD tolerance Td2 / TD2 (mm)0.200
Basic minor dia D1, d1 (mm)10.106
Minor dia max (mm)10.441
Minor dia min (mm)10.106
Minor dia tolerance TD1 (mm)0.335
Minor dia statusToleranced (D1 min, D1 max)
Upper deviation, pitch dia es / ES (mm)0.200
Lower deviation, pitch dia ei / EI (mm)0.000
Upper deviation, crest dia (mm)0.335
Lower deviation, crest dia (mm)0.000
LE short, up to (mm)6.0
LE normal, over (mm)6.0
LE normal, up to and incl. (mm)18.0
LE long, over (mm)18.0
LE sourceTable 7
Lead variation ± (mm)0.058
Equivalent change in functional dia (mm)0.100
Lead values sourceTable 17, p. 47
Half-angle variation ±1° 35′
Half-angle sourceTable 18
Lead angle at basic PD (deg)2.9355
Lead angle (deg min)2° 56′
Thread angle (deg)60
Flank angle (deg)30
Sharp V height H (mm)1.515544
Thread height h = 5H/8 (mm)0.947215
Crest flat (mm)0.437500
Root flat (mm)0.218750
Sweep cut: start diameter (mm)10.106000
Sweep cut: tip diameter (mm)12.000000
Sweep cut: depth (mm)0.947000
Sweep cut: profile width at start diameter (mm)1.312054
Crest flat as modelled (mm)0.437946
Inch (App. C): allowance (in.)0.00000
Inch (App. C): major dia min (in.)0.47244
Inch (App. C): pitch dia max (in.)0.43555
Inch (App. C): pitch dia min (in.)0.42768
Inch (App. C): PD tolerance (in.)0.00787
Inch (App. C): minor dia max (in.)0.41106
Inch (App. C): minor dia min (in.)0.39787
Inch (App. C): d3 min / D max, reference (in.)0.49024
Inch (App. C): pitch (in.)0.06890
Inch (App. C): printed page62
Check against formulasOK: all 7 printed Table 15 values agree with the formulas.
NotesStandard internal class, no allowance (para 5.5.2); ~ inch 2B.

Related tools

ASME B1.13M: Metric Screw Threads: M Profile. Source: workbook data (2026-10-10). Confirm against your licensed copy of the standard before use.