MIL-DTL-27426C
3.4.5.1 Notches. Notches in the rings shall conform to AS3215 through AS3218 as
appropriate to the type of ring.
3.4.6 Edges. The I.D. and O. D. circumferential edges of the ring material
shall be rounded. These edges shall be free from burrs, slivers, dents, nicks, cracks
and other irregularities that may adversely affect the ring performance. Unless
otherwise stipulated in the contract, burrs at the end and notch areas of the ring are
acceptable within the limits shown in Table I.
TABLE I
MATERIAL THICKNESS
MAXIMUM ACCEPTABLE BURR
(AT NOTCH ENDS ONLY)
.009"
TO .018"
.002"
.019"
TO .030"
.003"
.031"
TO .043"
.004"
.044"
AND OVER
.005"
3.4.7 Crimp. Unless otherwise stipulated in the contract, rings shall be
crimped according to Table II.
TABLE II
RING TYPE
RING SIZES NOT CRIMPED
RING SIZES CRIMPED
DASH NUMBERS
DASH NUMBERS
2A01
0100 0136
0137 - 0247
2A02
0100 0106
0107 0206
2B01
0100 0138
0139 0261
2B02
0100 - 0105
0106 - 0212
3.4.7.1 Crimp Height. The crimp height is equal to the ring thickness with the
tolerances shown in Table III.
TABLE III
RING THICKNESS
CRIMP HEIGHT TOLERANCE
.000" - .044"
+.002"/-.004"
.045" - .066"
+.003"/-.005"
.067" AND OVER
+.005"/-.007"
3.4.7.2 Crimp length and radius .
The crimp length and radius shall meet the
specifications shown in Table IV.
TABLE IV
MATERIAL THICKNESS
CRIMP LENGTH
CRIMP RADIUS
UP TO .021"
.095" MAX
.015
.022" - .031"
.187" MAX.
.015
.032" - .055"
.218" MAX.
.031
.056" TO .080"
.312" MAX.
.031
.081" AND OVER
.375" MAX.
.031
5
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