M5 × 0.8 M profile Internal Thread Specifications

M5x0.8-6H

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

5.000 min

max 5.240 (reference)

Pitch diameter

4.480 – 4.605

min – max

Minor diameter

4.134 – 4.334

min – max

Fundamental deviation

EI 0.000

pitch 0.8 mm · position H

Thread profile

M5x0.8-6H: 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

Dimension	Basic	Max	Min	Tolerance
Major diameter DRoot of the internal thread; max is for tool design only	5.000	5.240ref.	5.000	0.240ref.
Pitch diameter D2Sets the fit	4.480	4.605	4.480	0.125
Minor diameter D1Crest of the internal thread (the bore)	4.134	4.334	4.134	0.200
Deviations, pitch diameter ES / EIUpper and lower deviation from the basic pitch diameter (Fig. 4)	—	+0.125	0.000	—
Deviations, minor diameter ES / EICrest diameter	—	+0.200	0.000	—

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)

Lead, flank angle and length of engagement

Allowable lead variation ±δP: 0.036 mmOver the length of engagement
Equivalent change in functional diameter δd2: 0.062 mmHalf the pitch diameter toleranceformula gives 0.063
Allowable half-angle variation ±δα: 2° 20′ Each 30° flank angle
Length of engagement, normal LE: 2.5 – 7.5 mmShort up to / long over: see all values

Notes

Table 17 prints lead 0.036 / functional dia 0.062; para 10.1.5 with the PD tolerance 0.125 gives 0.036 / 0.063. The printed value is the round-half-to-even result (rounding rule used before ASME B1.30, Foreword (d)(4)). Standard internal class, no allowance (para 5.5.2); ~ inch 2B.

Mates

M5x0.8-6H 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

→ M5 × 0.5 mm → M4.5 × 0.75 mm → M5.5 × 0.5 mm → M5 × 0.8 external → ISO metric M5x0.8 internal

All values for M5x0.8-6Hevery column of the workbook row

All values of the workbook row M5x0.8-6H
Designation	M5x0.8-6H
Alternate designation (all capitals, para 7.2.3)	M5X0.8-6H INT
Pitch in designation	0.8
Thread form	M
Series	Coarse
Series name	Standard coarse pitch series (Table 4)
External / internal	Internal
Class	6H
Nominal size	M5
Pitch P (mm)	0.80
Basic major dia D, d (mm)	5.000
Size category	1st choice (Table 6, p. 9) · standard size
Source table	Table 15
Printed page	35
Thread type	M coarse (Table 4)
Tolerance position, pitch dia	H
Tolerance grade, pitch dia	6
Tolerance position, crest dia	H
Tolerance grade, crest dia	6
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)	5.240
Major dia min (mm)	5.000
Major dia tolerance Td (mm)	0.240
Major dia status	D min toleranced; D max for reference (para 9.3.1(d), Table 15 note 2)
Basic pitch dia D2, d2 (mm)	4.480
Pitch dia max (mm)	4.605
Pitch dia min (mm)	4.480
PD tolerance Td2 / TD2 (mm)	0.125
Basic minor dia D1, d1 (mm)	4.134
Minor dia max (mm)	4.334
Minor dia min (mm)	4.134
Minor dia tolerance TD1 (mm)	0.200
Minor dia status	Toleranced (D1 min, D1 max)
Upper deviation, pitch dia es / ES (mm)	0.125
Lower deviation, pitch dia ei / EI (mm)	0.000
Upper deviation, crest dia (mm)	0.200
Lower deviation, crest dia (mm)	0.000
LE short, up to (mm)	2.5
LE normal, over (mm)	2.5
LE normal, up to and incl. (mm)	7.5
LE long, over (mm)	7.5
LE source	Table 7
Lead variation ± (mm)	0.036
Equivalent change in functional dia (mm)	0.062
Lead values source	Table 17, p. 47
Half-angle variation ±	2° 20′
Half-angle source	Table 18
Lead angle at basic PD (deg)	3.2533
Lead angle (deg min)	3° 15′
Thread angle (deg)	60
Flank angle (deg)	30
Sharp V height H (mm)	0.692820
Thread height h = 5H/8 (mm)	0.433013
Crest flat (mm)	0.200000
Root flat (mm)	0.100000
Sweep cut: start diameter (mm)	4.134000
Sweep cut: tip diameter (mm)	5.000000
Sweep cut: depth (mm)	0.433000
Sweep cut: profile width at start diameter (mm)	0.599763
Crest flat as modelled (mm)	0.200237
Inch (App. C): allowance (in.)	0.00000
Inch (App. C): major dia min (in.)	0.19685
Inch (App. C): pitch dia max (in.)	0.18130
Inch (App. C): pitch dia min (in.)	0.17638
Inch (App. C): PD tolerance (in.)	0.00492
Inch (App. C): minor dia max (in.)	0.17063
Inch (App. C): minor dia min (in.)	0.16276
Inch (App. C): d3 min / D max, reference (in.)	0.20630
Inch (App. C): pitch (in.)	0.03150
Inch (App. C): printed page	62
Check against formulas	OK: all 7 printed Table 15 values agree with the formulas. Table 17 differs: printed 0.036 / 0.062, formula 0.036 / 0.063
Notes	Table 17 prints lead 0.036 / functional dia 0.062; para 10.1.5 with the PD tolerance 0.125 gives 0.036 / 0.063. The printed value is the round-half-to-even result (rounding rule used before ASME B1.30, Foreword (d)(4)). Standard internal class, no allowance (para 5.5.2); ~ inch 2B.

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