BOCHU

BOCHU BOCI Ceramic Rings

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$44.10 USD

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model M8×0.75（DY.C.A0004AA） M11×0.75（Y.Z.C0034） M11×0.75-S（DY.C.A0005AA） M11×0.75-P（DY.C.A0006AA）

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Original BOCHU BOCI ceramic ring family identified by thread, P/S structure where applicable, exact part number and BLT model. Do not confuse this component with a ceramic locking ring or an M16×1 nozzle-cooling ceramic.

Part Numbers and Matching Models

PART NUMBER	MATCHING MODEL
M8×0.75（DY.C.A0004AA）	①BLT310T ②BLT421T、BLT441T、BLT461T、BLT421TS、BLT442T、BLT462T ③BLT520H、BLT540H、BLT560H、BLT510、BLT520
M11×0.75（Y.Z.C0034）	①BLT310 ②BLT420、BLT420S、BLT440F、BLT460F、BLT421、BLT441、BLT461、BLT481、BLT4101、BLT442、BLT462、BLT482、BLT4102、BLT421S ③BLT640、BLT641、BLT641H(15KW)、BLT642H、BLT661、BLT661H、BLT662H、BLT681H、BLT682H、BLT6101H、BLT6102H、BLT662M、BLT682M、BLT6102M、BLT662MA、BLT682MA
M11×0.75-P（DY.C.A0006AA）	BLT442P、BLT462P、BLT482P、BLT4102P
M11×0.75-S（DY.C.A0005AA）	BLT4122、BLT6120H、BLT6140H、BLTA120M、BLTA140M, BLTA160M、BLTA180M、BLT980MA、BLT9100MA、BLT9120MA
M16×1 Nozzle Cooling Ceramic（DY.C.A0009AA）	BLT643H、BLT663H、BLT683H

How to Select the Correct Configuration

Confirm the complete part number, thread, published P/S notation where present, and the installed BLT model. Similar appearance or a matching thread alone does not establish interchangeability.

For the limited BLT421S reference, Y.Z.C0034 is the confirmed ceramic-body route. P.S.J0020 is a separate ceramic locking-ring route. Although both list M11×0.75, they are not interchangeable, a bundle, or a complete bill of materials.

For the M16×1 nozzle-cooling ceramic used with BLT643H, BLT663H and BLT683H, see the dedicated product route. If the existing part, complete part number, or installed model cannot be confirmed, contact BOCHU.store with a clear photo and maintenance record.