MIL-DTL-1222J
specified in 6.2. Unless otherwise specified (see 6.2) the thread series for
class 2A and 3A threads shall be coarse for sizes 1 inch and less and
constant 8 thread for sizes over 1 inch.
3.9.2 Studs.
3.9.2.1 Type I, II and III body diameter and thread length dimensions.
Type I, II and III body diameter and thread length dimensions shall be as
shown in table VI and table VII(see 6.2). The body diameters of type I, II,
and III studs are defined as follows:
a) Full body. The body diameter (A) is not less than the minimum
major diameter of the thread of the nut end, nor more than the
nominal (basic) size plus 0.020 inch.
b) Reduced body. The body diameter (A) is not less than the
minimum pitch diameter, nor more than the maximum major
diameter of the nut and thread.
c) Constant strength body.
(1) Cut or ground threads. The body diameter (A) is not
less than the stress area diameter nor more than the
stress area diameter plus the pitch diameter
tolerance for the class fit of the nut end thread.
(2) Rolled threads. The body diameter (A) is the same
diameter as the blank before thread rolling. This
blank diameter shall fall within the body diameter
dimensions shown in table VI.
3.9.2.2 Type IV diameter and length. Diameter, length, and end
configuration of continuous-thread studs shall be as specified (see 6.2).
3.9.2.3 Straightness. When rolled on a flat surface, the clearance as
measured by a feeler gauge shall not exceed the value BT/5D, where B is the
nominal length, D the nominal diameter, and T is the pitch diameter tolerance
of the nut end thread.
3.9.2.4 Length tolerance.
Length tolerance for studs shall be as
follows:
Tolerance for nominal stud diameter
7
3
9
Over 1¼
Fastener length (B)
/ to ½
/6 to 1¼
¼ to /
8
16
1
1
1
1
±/2
±/6
±/
±¼
Up to 6 inches
3
1
8
1
3
3
±/6
±/2
±/6
±¼
Over 6 inches
1
3
1
3.9.3 Bolts. Dimensions of type II bolts shall conform to ASME
B18.2.1. Dimensions of type III bolts shall conform to ASME B18.2.6. Unless
otherwise specified, see 6.2, the bearing surface shall be either washer
faced or chamfered.
3.9.4 Hex cap screws. Dimensions of type I hex cap screws in nominal
diameters of ¼ through 3 inches shall conform to ASME B18.2.1. Dimensions of
type I hex cap screws in nominal diameter of 3¼ through 4 inches shall be as
shown in table VIII.
3.9.5 Socket head cap screws.
Dimensions of hexagon socket head cap
screws shall conform to ASME B18.3.
3.9.6 Nuts. Dimensions of nuts shall conform to ASME B18.2.2. Unless
otherwise specified (see 6.2), the bearing surface shall be either washer
faced or chamfered. Dimensions of type I hex nuts (large diameter) and type
3
II hex jam nuts (large diameter) in nominal diameters of 1 / through 3 inches
4
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