MIL-PRF-2863C(SH)
3.3.1.2 Non-metallic rings.
Sizes shall conform to those shown in table II,
as specified (see 6.2).
TABLE II.
Sizes for grade A non-metallic rings.
Inside diameter
Outside diameter
Length
(in)
(in)
(in)
0.625
0.781
0.187
0.750
0.906
0.187
0.875
1.031
0.187
1.000
1.156
0.187
3.3.2
Grade B packing.
3.3.2.1 Metallic rings.
Sizes shall conform to those shown in table III, as
specified (see 6.2)
TABLE III.
Sizes for grade B metallic rings.
Inside diameter
Outside diameter
Length
(in)
(in)
(in)
0.625
0.781
0.187
0.625
0.781
0.250
0.625
0.781
0.375
0.625
0.781
0.406
0.625
0.781
0.437
0.750
0.906
0.250
0.750
0.906
0.375
3.3.2.2 Non-metallic rings. Sizes shall conform to those shown in table IV,
as specified (see 6.2). The rings shall be sufficiently resilient to insure
flowing into the threads of the stuffing box by light caulking without
deformation to the tube ends.
TABLE IV.
Sizes for grade B non-metallic rings.
Inside diameter
Outside diameter
Length
(in)
(in)
(in)
0.625
0.781
0.187
0.625
0.781
0.250
0.750
0.906
0.187
3.3.3 Tolerances. A tolerance of minus 0, plus 0.007 inch will be permitted
on the inside diameter. A tolerance of plus or minus 0.03 inch will be
permitted for outside diameter and length. The inside diameter, outside
diameter and length shall be measured to the nearest 0.01 inch.
3.4 Weight. The weight per 1000 rings shall be within 20% of the weight of
the sample submitted for qualification. Individual rings weighed during
inspection shall be weighed to the nearest 0.0002 pounds (0.1g).
3.5
Resilience of metal rings.
3.5.1 Grade A. The resiliency shall be such that the change in height
(compression) of a stack of six rings shall not be less than 0.10 inch or more
than 0.20 inch (see 4.4.1).
3.5.2 Grade B. The resiliency shall be such that the change in height
(compression) of a stack of six rings shall not be less than 0.02 inch or more
than 0.05 inch (see 4.4.1).
3
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business