MIL-DTL-1222J
APPENDIX
Part Identification Numbering System
A.1.1 Scope The appendix details a procedure for assigning part numbers
to the fasteners procured to MIL-DTL-1222. This appendix is not a mandatory
part of this specification. The information contained herein is intended for
guidance only.
A.1.2 Format. the part number shall consist of nine fields.
Each field
describes a different aspect of the fastener.
A.1.2.1 Field 1. Field 1 shall be M1222. This indicates that the
fastener was made in accordance with MIL-DTL-1222.
A.1.2.2 Field 2 Field 2 represents the fastener type.
a) B2 signifies a heavy hex bolt.
b) B3 signifies a heavy hex structural bolt.
c) R signifies a hex cap screw.
d) S signifies a socket head cap screw.
e) ST1 signifies a full-body stud
f) ST2 signifies a reduced-body stud
g) ST3 signifies a constant-strength body stud (type III).
h) ST4 signifies a continuous-thread stud (type IV).
i) N1 signifies a hex nut.
j) N2 signifies a hex jam nut.
k) N3 signifies a heavy hex nut.
l) N4 signifies heavy hex jam nut.
m) N5 signifies a hex slotted nut.
A.1.2.3 Field 3 Field 3 represents the bearing surface of the or nut.
a) W signifies washer faced.
b) C signifies chamfered.
c) X signifies either washer faced or chamfered.
d) N signifies that this field does not apply.
1
A.1.2.4 Field 4 Field 4 represents the nominal diameter in / 6ths of an
1
9
inch. Use one digit for fasteners / 6 and smaller and 2 digits for fasteners
1
5
/ inch and larger.
8
A.1.2.5 Field 5. Field 5 represents the thread type.
a) C signifies a coarse (UNC or UNRC to ASME B1.1) thread type.
b) F signifies a fine (UNF or UNRF to ASME B1.1) thread type.
c) M signifies metric threads in accordance with ASME B.13M.
A.1.2.6 Field 6. Field 6 represents the thread class.
a) 2 signifies a class 2A thread to ASME B1.1.
b) 3 signifies a class 3A thread to ASME B1.1 (includes style C
studs).
c) 4 signifies a class 4G6G thread to ASME B1.3M.
d) 6 signifies a class 6G thread to ASME B1.3M.
e) D signifies a class 3A thread and a class 2A thread to ASME
B1.1 (style D studs).
f) B signifies a class 5HF thread to ASME B1.12 and a class 2A
thread to ASME B1.1 (style B studs).
g) A signifies a class 5HF thread to ASME B1.12 and a class 3A
thread to ASME B1.1 (style A studs).
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