The HZT029152401 half-thread external hexagonal bolt assembly (Bolt M10×170) is a key fastener used to connect the first end flange (HZT029150601) to the pressure chamber/motor cover (HZT029150901) in the HZT 15MBD marine vacuum sewage pump system.
Each pump uses four of these bolts. The combination of a flat washer and a spring washer provides durable and reliable axial preload, ensuring the stability of the vacuum seal structure during long-term operation.
I. Structure and Manufacturing Features
* Partial Thread Design:
The front section of the bolt uses a polished rod for positioning, while the rear threaded section provides tightening torque, achieving integrated assembly positioning and tightening.
* SUS304 stainless steel (grade A2-70):
Excellent salt spray and corrosion resistance, suitable for long-term use in marine, high-humidity, and acidic and alkaline environments.
* Surface Treatment: Passivation + Electropolishing
Improves rust resistance and surface finish while preventing galvanic corrosion.
* High-Precision Machining:
The threads are precision rolled, and the coaxiality of the polished rod and threaded section is strictly controlled, ensuring smooth assembly between the end flange and the motor cover.
* Supporting Components:
Includes one flat washer and one spring lock washer for enhanced tightening and anti-loosening performance.
II. Function and Assembly Logic
This bolt is located at the discharge section of the vacuum pump and is used to secure the connection between the end flange (HZT029150601) and the pressure chamber (HZT029150901).
A four-point evenly distributed structure provides high-strength fixing between the motor end and the pump body, ensuring:
* ⚙️ Reliable pressure sealing – preventing leakage of high-pressure water vapor from the discharge end;
* 🧩 Stable assembly accuracy – The polished rod is positioned to prevent misalignment and stress concentration;
* 🔩 Excellent anti-loosening and anti-vibration performance – A combination of flat washers and spring washers mitigates the risk of vibration loosening;
* 💧 Long-term corrosion resistance – The electrolytic treatment of SUS304 steel ensures long-term marine operation onboard ships.
III. Application and System Location
The HZT029152401 is installed in the discharge section at the rear end of the pump body and is a key mechanical connection between the discharge chamber and the motor support end of the vacuum sewage pump.
This area is simultaneously subject to:
* axial force transmitted by the motor;
* reaction force from the internal pressure of the pump chamber;
* system vibration and temperature cycling.
Therefore, a non-standard length (170mm) and a semi-smooth rod structure are used to balance strength, precision, and assembly stability.
IV. Industry Applications
HZT029152401 is widely used in:
* 🚢 Marine Vacuum Sewage and Blackwater Discharge Systems
* ⚙️ Vacuum Toilet Systems
* 🛳️ Offshore Wastewater Treatment Units
* 🧰 Vacuum Pump Maintenance Parts
V. Technical Support and Supply
HZT provides complete equipment, system design, and accessory services:
* Comprehensive solutions for marine vacuum pumps and sewage vacuum pumping stations
* OEM system and shipyard support
* Fast parts supply and repair services
📧 Technical Support Email: SJDT1199@gmail.com
🌐 Official Website: www.vacuumtoiletparts.com
1. HZT029151001 – Flap valve base
2. HZT037302200 – Flap valve disc
3. HZT029151003 – Pressure plate
4. HZT029150310 – Suction chamber cover
5. HZT037219210 – O-ring
6. HZT029150320 – Suction chamber
7. HZT020202900 – Hexagon socket sealing plug
8. HZT029151900 – Lock nut
9. HZT029150400 – Rotating blade
10. HZT029150500 – Fixed blade
11. HZT029152401 – Half-threaded hexagon bolt (M10x170) with spring washer
12. HZT029150601 – End flange
13. HZT029150701 – Rotor (Impeller)
14. HZT029150800 – Rotor Housing
15. HZT029151800 – Spacer
16. HZT038201500 – Shaft Seal
17. HZT034507420 – Hose Clamp
18. HZT034507500 – Hose
19. HZT029150391 – Shaft Seal Flange
20. HZT029150901 – Pressure Chamber (Discharge Chamber)
21. HZT029150310-02 – Suction Cover (Metal Sheet)
22. HZT029150450 – Blade Assembly
23. HZT/- – Motor – 2.2 kW – Marine Motor
24. HZT029015001 – 15MBD Vacuum Pump
25. HZT023280061 – Flap Valve Seat
26. HZT037302100 – Flap Valve Disc
27. HZT023280091 – Pressure Plate
28. HZT023280050 – Suction Chamber Cover
29. HZT037219260 – O-Ring
30. HZT023280070 – Flange Fastener
31. HZT023280080 – Flange
32. HZT023280040 – Suction Chamber
33. HZT020202900 – Plug
34. HZT020203100 – Rotating Blade
35. HZT020203100 – Fixed Blade
36. HZT021201000 – Blade Holder
37. HZT036202010 – Half-threaded Hexagon Bolt (with Spring Washer) M12x220
38. HZT023200210 – Suction Chamber End Plate
39. HZT023219000 – Rotor Housing
40. HZT021265401 – Rotor (Impeller)
41. HZT021217000 – RG 3/8” Plug
42. HZT023219000 – Pressure Chamber (Discharge Chamber)
43. HZT023260400 – Spacer Sleeve
44. HZT038218900 – Shaft Seal
45. HZT023280030 – Shaft Seal Flange
46. HZT023280050-02 – Suction Chamber Cover (Metal Plate)
47. HZT/- – Motor – 3.0kW – Marine Motor
48. HZT023280010 – 25MBA Vacuum Pump
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