FIELD: machine building.
SUBSTANCE: threads are made of expanded graphite, coiled in lengthwise axis and Teflon-clad. Note here that cladding represents coils of porous Teflon tape stretched in direction opposite the thread coiling. In coiling, every other convolution of Teflon tape overlaps the previous convolution.
EFFECT: higher reliability.
6 cl, 4 dwg
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