MIL & NAS - STS Specification
SPEC No. SEIP Part No.
SAE AS53519 / 1 = H-M-x Sleeves (NO pre-installed lead)
SAE AS53519 / 2 = H-ML-x Sleeves (WITH pre-installed lead)
NAS 1744 = H-C4-x
NAS 1745 = H-C-x & L-C-x
NAS 1746 = H-I-x