MIL-PRF-19500/550C
Dimensions
Ltr
Inches
Millimeters
Notes
Min
Max
Min
Max
CD
.375
9.53
7
C
.080
2.03
HF
.669
.688
16.99
17.48
HT
.115
.200
2.92
5.08
CH
.450
11.43
OAH
.750
1.000
19.05
25.40
SL
.422
.453
10.72
11.51
SU
.090
2.29
4
CD1
.667
16.94
SD
5
UD
.220
.249
5.59
6.32
θT
.140
.175
3.56
4.45
NOTES:
1. Dimensions are in inches.
2. Millimeter equivalents are given for information only.
3. Units must not be damaged by torque of 30 inch-pound
applied to .25-28 UNF-2B nut assembled on thread.
4. Length of incomplete or undercut threads of UD.
5. Maximum pitch diameter of plated threads shall be basic
pitch diameter .2268 inch (5.761 mm).
6. A chamfer or undercut on one or both ends of the hex
portion is optional; minimum base diameter at seating
plane .60 inch (15.2 mm).
7. The angular orientation and peripheral configuration of
terminal 1 is undefined.
8. Standard types shall have cathode connected to stud.
Reverse types shall have anode connected to stud.
9. Term 2 threads in accordance with FED-STD-H28.
10. In accordance with ASME Y14.5M, diameters are
equivalent to φx symbology.
* FIGURE 1. Physical dimensions (DO-203AB) - Continued.
4
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