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Aftermarket ceramic nozzle holder for BOCI (Bochu) 2D fiber laser cutting heads. Replaces BOCI Y.Z.C0034, the white D41 ceramic body with the M11 x 0.75 nozzle thread.
The ceramic sits at the bottom of the head between the nozzle connector and the nozzle. It insulates the nozzle so the capacitive height sensor can read the gap to the sheet, and it is the part designed to break first in a collision. It is 41 mm across the top flange and 34 mm high, with a stainless thread insert for M11 x 0.75 nozzles.
It fits the BOCI BLT310, the BLT4 series (BLT421, BLT441, BLT461, BLT481) and the BLT6 series heads that use the D41 ceramic. Sold in packs of 1, 5 or 10.
| Replaces | BOCI Y.Z.C0034 (C0034) |
| Top Diameter | 41 mm |
| Height | 34 mm |
| Nozzle Thread | M11 x 0.75 |
| Colour | White |
| Material | Technical ceramic with stainless steel thread insert |
| Use | 2D sheet cutting heads |
| Pack Options | 1 pack, 5 pack, 10 pack |
| Stat. HS-Code | 846693 |
| Pack | Dimensions | BOCI Part No.(SPM Part No.) | Fits |
|---|---|---|---|
| D41 x H34 mm, M11 | D41 x H34 mm, M11 | Y.Z.C0034(SPM-LAS-2242) | BLT310, BLT421, BLT441, BLT461, BLT481, BLT642H, BLT6102H |
After a head collision
A crash into a tipped up part usually breaks the ceramic first, which protects the rest of the head. A spare on the shelf gets the machine cutting again within minutes.
Height sensing faults
A cracked ceramic, a loose thread or a burned contact pin upsets the capacitive height control, so the head hunts, stops with a sensor alarm or touches the sheet. Replace the ceramic before chasing the sensor.
Nozzle will not centre or sit square
A worn or damaged thread in the ceramic lets the nozzle sit off centre, which shows as uneven cut quality in different directions.
Planned maintenance
Check the ceramic at every nozzle change and replace it when it is chipped, cracked, discoloured or loose.
| Seller | Price | Checked |
|---|---|---|
| eBay, aftermarket (cheapest, 'BOCI Laser Cutting Ceramic Ring Body D41M11') | USD 16.59 | checked 4 Oct 2026 |
| Cloudray, aftermarket (BOCI Laser Cutting Ceramics D41 H34 M11) | USD 27.00 | checked 4 Oct 2026 |
| Spare Part Mart (aftermarket) | USD 13.27 | this page |
Compared with other aftermarket sellers of the same ceramic, our single piece price is 20% to 51% less. Prices are in US dollars for one piece, as listed on the date shown. The 5 and 10 packs cost less per piece.
Found this part cheaper elsewhere? Send us the listing and we will beat it under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
No. This is the white D41 ceramic, BOCI Y.Z.C0034. BOCI also makes a black D41 ceramic, DY.C.A0005AA, with a wider lower body. Check the colour and number of the ceramic you are replacing.
No. It is an aftermarket ceramic made to the same size and thread. It is not made by or affiliated with BOCI (Bochu); the BOCI part number is shown only so you can match the part you are replacing.
It is the same ceramic in each. The 10 pack has the lowest price per piece and suits shops that crash a head now and then or run several machines.
Yes. After changing the ceramic, fit the nozzle, run the capacitive height sensor calibration on the controller and check the nozzle centring before cutting.
Yes. Shipping options and costs for your country are shown at checkout, and every order is covered by our 30 day money back guarantee and price beat guarantee.
