Ceramic UHP Plunger | .875 OD | 90K | HJ-72162253
The HJ Waterjet Ceramic UHP Plunger (.875 OD) | HJ-72162253 is a precision-engineered replacement plunger designed for compatible 90,000 PSI (6,200 bar) ultra-high-pressure waterjet intensifier pumps. Manufactured from premium high-density technical ceramic, this HJ-72162253 ceramic UHP plunger is engineered to provide exceptional wear resistance, dimensional stability, and a smooth surface finish for reliable high-pressure waterjet cutting performance.
Designed for compatible PRO-III 90K intensifier pumps with .875-inch plunger assemblies, the HJ-72162253 is manufactured to OEM specifications for accurate fit, dependable installation, and long-term service. Its precision ceramic construction helps maintain consistent plunger dimensions and operating performance under demanding ultra-high-pressure conditions.
Advanced 100% Ceramic Construction
The key advantage of HJ Waterjet 100% ceramic plunger design is its all-ceramic construction. Unlike traditional piston plungers that incorporate metal shoulders, this advanced ceramic design eliminates the metal-to-ceramic interface and provides a smoother, more consistent operating surface.
The smooth ceramic surface helps reduce friction between the plunger and high-pressure seals, which can help minimize heat generation, seal wear, and premature component degradation. By reducing the effects associated with different thermal expansion rates between metal and ceramic components, the all-ceramic design is engineered for greater operating consistency and improved pump reliability.
Built for 90,000 PSI Waterjet Cutting
The HJ-72162253 .875-inch ceramic plunger is designed for demanding ultra-high-pressure waterjet applications where precision, durability, and consistent pressure are essential. Its high-density technical ceramic construction provides the dimensional integrity required for repeated operation at pressures up to 90,000 PSI (6,200 bar) in compatible intensifier pump systems.
A precision-finished ceramic plunger can help support:
- Extended high-pressure seal life
- Reduced friction and operating wear
- Consistent plunger movement
- Reliable pressure generation
- Improved dimensional stability
- Reduced maintenance requirements
- Dependable long-term intensifier pump performance
HJ-72162253 Ceramic UHP Plunger Features
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Part Number: HJ-72162253
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Plunger Size: .875-inch OD
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Construction: 100% high-density technical ceramic
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Pressure Rating: 90,000 PSI / 6,200 bar applications
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Pump Compatibility: Compatible PRO-III 90K intensifier pumps with .875-inch plunger assemblies
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Design: Precision-engineered ceramic UHP plunger
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Primary Benefits: Wear resistance, smooth operation, dimensional stability, and reliable sealing performance
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Application: Ultra-high-pressure waterjet intensifier pump systems
Frequently Asked Questions | HJ-72162253
1. What is HJ Waterjet HJ-72162253?
HJ-72162253 is a Full Ceramic High-Pressure Plunger used in KMT PRO-III ultra-high-pressure waterjet intensifier pumps.
2. What is the pressure rating of HJ-72162253?
It is designed for 90,000 psi (6,200 bar) waterjet systems.
3. What size plunger is HJ-72162253?
The plunger has a nominal 0.875-inch outside diameter, commonly referred to as the 0.88-inch plunger.
4. What KMT pumps does HJ-72162253 fit?
HJ-72162253 is for all PRO-III units using the 0.88-inch plunger configuration.
5. Is HJ-72162253 a Ceramic Plunger?
Yes. It is specifically identified as a FULL Ceramic Plunger.
6. What is the function of the HJ-72162253 plunger?
The plunger transfers the hydraulic drive force into the high-pressure water section of the intensifier, allowing the pump to generate the pressure required for waterjet cutting.
7. What parts work with HJ-72162253?
Common associated PRO-III components include the 72158494 UHP Seal Assembly, 72166738 UHP Cylinder, 72163802 Cylinder Liner, 05130091 Hydraulic Seal Cartridge, and 72170157 Sealing Head Assembly.
8. Does HJ-72162253 work with the HJ-72158494 Seal Assembly?
Yes. The HJ-72158494 Canister Seal Assembly as sealing around the ceramic plunger HJ-72162253.
9. What are common symptoms of a worn HJ-72162253 plunger?
Potential symptoms can include seal leakage, reduced pump performance, pressure instability, accelerated seal wear, and visible wear or damage on the plunger. These symptoms can also originate from seals, the cylinder, alignment, or other intensifier components, so inspection is recommended before replacement.
10. How often should HJ-72162253 be replaced?
There is not a universal replacement interval. Service life depends on operating hours, water quality, pressure, seal condition, alignment, and maintenance practices. Inspection during scheduled intensifier maintenance is more appropriate than replacing solely on a fixed calendar interval.
11. Can a damaged ceramic plunger damage the seals?
Yes. Scratches, chips, cracks, excessive wear, or surface damage can compromise the sealing interface and contribute to premature seal failure.
12. Is HJ-72162253 the same as HJ-72138164?
No. Both are ceramic 0.875/0.88-inch plungers rated at 90,000 psi, but HJ-72162253 is for PRO-III units, while HJ-72138164 is specified for SL-VI PRO units.
13. Is HJ-72162253 sold as an individual plunger?
Yes. Current parts listings identify HJ-72162253 as a one-piece .875-inch plunger.
14. What should I replace when installing a new HJ-72162253?
It is worth inspecting the UHP seal assembly, cylinder liner, hydraulic seal cartridge, cylinder, and related sealing components at the same time. It is part of the PRO-III intensifier assembly rather than an isolated component.
Why Choose HJ Waterjet?
HJ Waterjet replacement parts are engineered to deliver premium-quality, reliable performance, precision fit, and long-lasting durability at a competitive price. Precision manufactured to exact specifications using high-quality materials and tight tolerances, our components are designed for compatibility with OEM waterjet systems and demanding industrial applications. By focusing on quality, precision, and value—not expensive branding—we help manufacturers reduce maintenance costs, minimize downtime, and maximize productivity without compromising performance or reliability. When precision matters, HJ Waterjet delivers the quality, reliability, and value professionals trust. Premium Performance Without the Premium Price