Sure, parts to ASME specifications cost less than MIL-SPEC parts. They should! It costs more to produce parts that conform to military requirements. Know for sure that you are supplying parts that meet MIL-SPEC call outs for material, hardness, plating, testing and certification. For tooth, helical and Belleville washers and metallic and non-metallic flat washers that meet those specifications, rely on the MIL-SPEC specialist:
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Mil-Spec Fasteners
AN—Air Force—Navy Aeronautical
Standards
AN901
AN940
AN960
AN961
AN970
AN8013
AN122576 thru
AN122600
AN212588
NAS—National Aerospace Standards
NAS460
NAS513
NAS549
NAS620
NAS1070
NAS1149
NAS1169
NAS1193
NAS1195
NAS1197
NAS1252
NAS1515
NAS1587
NAS1598
NAS1640
NAS1676
NASM Standards
NASM15795
NASM20002
NASM35333
NASM35338
NASM45595