MIL-PRF-81757/1E
REQUIREMENTS:
1. Part or identifying number. The part or identifying number (PIN) of the items covered by this
specification sheet shall be as shown below. Each PIN within a category differs in terms of
dimensions and other parameters from the other PINs in that category. Each item shall conform
to the requirements of the indicated figures and tables.
a. Cells. PINs M81757/1-2, M81757/1-4, and M81757/1-6 on figure 1 and in table I.
b. Washers. PINs M81757/1-7A and M81757/1-7B on figure 2 and in table II.
c. Belleville springs. PINs M81757/1-8A and M81757/1-8B on figure 3 and in table III.
d. Terminal screws. PINs M81757/1-9 and M81757/1-10 on figure 4 and in table IV.
2. The cell fill opening shall accommodate and interface with all installation features of the
vented filler cap supplied in accordance with 3.7.11.6 herein. This shall include:
a. The mechanisms for attaching (tightening and locking) and removing the cap.
b. The methods used for creating a seal (air and liquid) at the fill opening (see 3.7.11.7 and
3.10.13 of the general specification).
3. The roughness of the surface finish of the electrical contact area of each terminal post shall be
not greater than 63 microinches high and not greater than 0.02 inch wide. Waviness shall be not
greater than 0.005 inch high.
4. MIL-PRF-81757 variance. The items shall comply with MIL-PRF-81757 except as follows.
4.1 Modify the following paragraph:
3.7.11.6 Vented filler cap. Insert after the first sentence: "The particular
MIL-PRF-81757/2 vented filler cap (such as PIN M81757/2-1, M81757/2-2) to be
installed on the cell shall be as follows:
"a. Unless otherwise indicated, when a cell is purchased separately from a battery, install
the M81757/2-1 vented filler cap (see 6.2).
"b. When a cell is supplied as a component installed in a MIL-PRF-81757 battery, install
the vented filler cap that is required by the battery's specification sheet."
5
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business