Machinery's Handbook, 31st Edition
2036
Metric Screw Threads MJ Profile Table 2. ANSI Standard Metric Screw Threads MJ Profile, Diameter-Pitch Combinations for Aerospace ANSI/ASME B1.21M-1997 (R2018) Aerospace Screws, Bolts and Nuts Aerospace Fluid System Fittings Nom. Size a Pitch Nom. Size Pitch Nom. Size Pitch Nom. Size Pitch Nom. Size Pitch Nom. Size Pitch Nom. Size Pitch 1.6 0.35 5 0.8 14 1.5 27 2 8 1 20 1.5 36 1.5 2 0.4 6 1 16 1.5 30 2 10 1 22 1.5 39 1.5 2.5 0.45 7 1 18 1.5 33 2 12 1.25 24 1.5 42 2 3 0.5 8 1 20 1.5 36 2 14 1.5 27 1.5 48 2 3.5 0.6 10 1.25 22 1.5 39 2 16 1.5 30 1.5 50 2 4 0.7 12 1.25 24 2 … … 181.5 331.5 … … All dimensions are in millimeters. a For threads smaller than 1.6 mm nominal size, use miniature screw threads (ANSI B1.10M).
Internal Thread
0.125 H
60°
T D 2
0.375 H
0.5625 H
2
T D 1 2
Basic Profile
0.3125 H
D 1 Max
D Min = D D 2 Min = D 2 D 2 Max
D Max
D 1 Min
External Thread
T d 2
0.5625 H
T d 2 2
Basic Profile R max = 0.18042 P
T d 3 2
0.66667 H
d 1
d Min
d 2 Min
d 3 Min
R min = 0.15011 P
d Max = d
d 3 Max
d 2 Max = d 2
Fig. 1. Internal MJ Thread Basic and Design Profiles (Top) and External MJ Thread Basic and Design Profiles (Bottom) Showing Tolerance Zones
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