FIELD: internal combustion engines. SUBSTANCE: bimetal billet of central electrode of spark plug has wall of shell which internal surface has circular collar of variable thickness. Maximum thickness of shell wall in this point amounts to 0.2-0.3 outer diameter of shell. Maximum thickening of collar is located at distance equal to 0.020-0.027 length of billed on side of open butt of shell. EFFECT: facilitated manufacture, enhanced operational characteristics. 3 dwg
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