MJ2.2 × 0.45 MJ profile Internal Thread Specifications

MJ2.2 x 0.45 - 4H6H

ASMESTD: ASME B1.21MSOURCE: Table 7 · p. 21TYPE: Internal (nut/tapped hole)CLASS: 4H6HSERIES: Coarse pitchAerospace fluid fittings, grade 6 minor dia2nd choice (Col. 2)

Major diameter

2.200 min

max 2.325 (reference)

Pitch diameter

1.908 – 1.968

min – max

Minor diameter

1.762 – 1.887

min – max

Pitch

0.45

Thread profile

MJ2.2 x 0.45 - 4H6H: solid line = maximum material profile, dashed = minimum material, hatched = tolerance zone, grey dashed = basic profile. Drawn to scale; values in mm, diameters shortened.

Limits of size, class 4H6H

Dimension	Basic	Max	Min	Tolerance
Major diameter DRoot of the nut; max for reference	2.200	2.325ref.	2.200	0.125
Pitch diameter D2Sets the fit	1.90772	1.968	1.908	0.060
Minor diameter D1Nut crest; clears the bolt root radius	1.76157	1.887	1.762	0.125
Allowance EISpace for coating		0.000

Dimensions in millimetres. Values are those of the standard (ASME B1.21M); 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

Lead, flank angle and length of engagement

Allowable lead variation ±δP: 0.0173 mmBetween any two points within the GO gage length
Equivalent change in functional diameter δd2: 0.0300 mmHalf the pitch diameter tolerance
Allowable half-angle variation ±δα: 1° 45′ Each 30° flank
Cumulative form variation: 0.0300 mmWhen specified for H/h: 0.5 × PD tolerance (para. 4.4.1)
Runout of major/minor to pitch cylinder FIM: 0.060 mmMax FIM when measured (para. 4.4.3)
Length of engagement, normal upper limit LE: 3.300 mmTable 12 / 13 allow the tolerance for this range

MJ root radius and minor diameter paras. 1.1, 2.4.2, Fig. 4

Coating allowance, pitch diameter: 0.025 mm
Coating allowance, major and minor diameter: 0.013 mm

Notes

MJ internal minor dia D1 min 1.762 mm = D min - 9/8H: raised above the M profile to clear the external root radius (para. 1.1). No root radius is specified; the root may not transgress the basic profile (para. 2.4.1). MJ internal threads accept ASME B1.13M (M profile) external threads, but an MJ external thread may interfere with an M internal thread minor dia (para. 1.3).

Mates

MJ2.2 x 0.45 - 4H6H takes a thread of the same standard at the same size and pitch. The standard mating external thread is class 4h6h. 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

→ MJ2 × 0.4 mm → MJ2.5 × 0.45 mm → MJ2.2 × 0.45 external

All values for MJ2.2 x 0.45 - 4H6Hevery column of the workbook row

All values of the workbook row MJ2.2 x 0.45 - 4H6H
Designation	MJ2.2 x 0.45 - 4H6H
Alternate designation	MJ2.2x0.45-4H6H
Pitch (mm)	0.45
Thread form	MJ
Series (Table 2)	Coarse
Series name	Coarse pitch
External / internal	Internal
Class	4H6H
Nominal size (mm)	2.2
Pitch P (mm)	0.45
Basic major dia D, d (mm)	2.200
Size category	2nd choice (Col. 2)
Source table	Table 7
Printed page	21
Major dia max (mm)	2.325
Major dia min (mm)	2.200
Major dia tolerance (mm)	0.125
PD tolerance LE basis	1D
LE for PD tolerance (mm)	2.200
Allowance es / EI (mm)	0.000
Major dia status	Min toleranced; max = D2 max + 11/12H (para. 4.3.2)
Basic pitch dia D2, d2 (mm)	1.90772
Pitch dia max (mm)	1.968
Pitch dia min (mm)	1.908
PD tolerance (mm)	0.060
Basic minor dia D1, d1 (mm)	1.76157
Minor dia max (mm)	1.887
Minor dia min (mm)	1.762
Minor dia tolerance (mm)	0.125
Minor dia status	Toleranced (TD1 grade 6, Table 10)
Root radius max (mm)	none specified
Root radius min (mm)	none specified
Lead variation ± (mm)	0.0173
Equivalent change in functional dia (mm)	0.0300
Lead values source	Table 12, p. 44
Half-angle variation ±	1° 45′
Half-angle source	Table 13, p. 50
Lead angle at basic PD (deg)	4.2939
Lead angle (deg min)	4° 18′
Tensile stress area As (mm²)	not given in the standard
Thread angle (deg)	60
Flank angle (deg)	30
Sharp V height H (mm)	0.38971
Thread height h (mm)	0.21921
Crest flat (mm)	0.14063
Root flat (mm)	0.05625
Root radius for model (mm)	none specified
Sweep cut: start diameter (mm)	1.762
Sweep cut: tip diameter (mm)	2.200
Sweep cut: depth (mm)	0.21900
Sweep cut: profile width at start diameter (mm)	0.30938
Crest flat as modelled (mm)	0.14062
Normal LE upper limit (mm)	3.300
PD tolerance, LE over 1.5D/15P to 3D/30P (×1.25) (mm)	0.075
PD tolerance, LE over 3D/30P (×1.5) (mm)	0.090
Cumulative form variation 0.5×PD tol (mm)	0.0300
Runout max FIM = PD tol (mm)	0.060
Coating allowance, pitch dia (mm)	0.025
Coating allowance, major and minor dia (mm)	0.013
Listed in ISO 261	Yes
Class use	Aerospace fluid fittings, grade 6 minor dia
Check against formulas	OK
Notes	MJ internal minor dia D1 min 1.762 mm = D min - 9/8H: raised above the M profile to clear the external root radius (para. 1.1). No root radius is specified; the root may not transgress the basic profile (para. 2.4.1). MJ internal threads accept ASME B1.13M (M profile) external threads, but an MJ external thread may interfere with an M internal thread minor dia (para. 1.3).
PD tolerance grade	4
Tolerance position	H
Allowable taper (mm), para. 4.4.4	0.060

ASME B1.21M: Metric Screw Threads: MJ Profile. Source: workbook data (2026-10-11). Confirm against your licensed copy of the standard before use.