Pall HC7500SDP4Z Replacement Filter Element — Cross-Reference & Specifications
Hydrafil Part Number: BF-PAL-624377-L4-3MV | Ships same day from Detroit, MI | OEM-equivalent performance
The HC7500SDP4Z is the Viton-sealed variant of Pall’s 3µm short-body element, purpose-built for servo valve and precision control circuits operating in demanding thermal environments or on phosphate ester, fire-resistant, or synthetic hydraulic fluids where Buna-N seals are incompatible. The Hydrafil BF-PAL-624377-L4-3MV replicates the OEM’s ultra-fine 3µm microglass filtration in the 6.9 in compact L4 housing, while the Viton (Fluorocarbon) seals extend the element’s rated operating range to approximately 400 °F and maintain compatibility with aggressive fluid chemistries that attack nitrile compounds. This is the correct replacement for any HC7500SDP4Z application — do not substitute the Buna-N SDN4H variant in Viton-seal circuits.
Dimensional Specifications
Incorrect element dimensions can unseat the bypass valve or allow unfiltered fluid to bypass the element entirely — always confirm the dimensional match before installation.
| Specification | Value |
|---|---|
| Outer Diameter (Top) | 5.06 in |
| Outer Diameter (Bottom) | 5.06 in |
| Element Length | 6.9 in |
| Thread Size | 1.5 - 16 |
| Collapse Rating | 100 psid |
Media & Construction
Viton-seal construction is selected for chemical compatibility with synthetic and fire-resistant hydraulic fluids, while the microglass media ensures consistent sub-5-micron performance regardless of fluid type.
- Filtration Media: Microglass Fiber Media — borosilicate microglass provides superior contaminant capture efficiency and dirt-holding capacity versus cellulose at the sub-5-micron range, critical for servo valve protection in high-value fluid systems
- Seal Material: Viton (Fluorocarbon) — rated to approximately 400 °F and compatible with phosphate ester (Skydrol/Fyrquel), polyol ester, synthetic hydrocarbon, and high-temperature petroleum fluids; the mandatory seal choice for any non-mineral-oil hydraulic application
- End Caps: Corrosion Resistant Steel — corrosion resistant for long service life
- Center Tube: Corrosion Resistant Steel — maintains structural integrity under pressure cycling
Filtration Performance Rating
The 3µm rating on the SDP4Z targets the particle size range that causes the most rapid degradation of servo valve spools and proportional valve control components — the 2–10µm range accounts for the majority of precision clearance wear in high-response hydraulic valves. Beta Bx = 200 and Bx[c] = 1000 confirms that fewer than 0.1% of 3µm-and-larger particles penetrate the element, keeping downstream fluid at ISO cleanliness levels appropriate for servo-grade components.
The 3µm Viton-seal L4 element is specified for high-temperature servo circuits and any hydraulic system using phosphate ester, synthetic, or fire-resistant fluid — applications where Buna-N seals will swell or degrade and contaminate the fluid they’re meant to protect.
ISO Standards Compliance
This element is manufactured to comply with the following ISO performance test standards:
| ISO Standard | What It Tests |
|---|---|
| ISO 2941 | Collapse & burst resistance |
| ISO 2942 | Fabrication integrity & bypass valve function |
| ISO 2943 | Material compatibility with hydraulic fluids |
| ISO 3724 | Flow fatigue characteristics |
| ISO 3968 | Pressure drop vs. flow rate characteristics |
| ISO 16889 | Multi-pass performance (Beta ratio methodology) |
About the Pall HC7500SDP4Z
The HC7500SDP4Z is Pall’s 3µm Viton-sealed short-body HC7500 filter element, designed for servo and proportional valve protection in systems where elevated temperatures or aggressive fluid chemistry demand Fluorocarbon sealing. It sees frequent application in aerospace ground support equipment, steel mill hydraulics using fire-resistant fluids, and high-cycle industrial presses operating at temperatures above the Buna-N service limit. The 6.9 in compact L4 body fits the same HC7500-series filter heads as the rest of the family, making it a drop-in replacement wherever the OEM SDP4Z is currently installed.
Why Order from Hydrafil?
- OEM-equivalent performance at a lower cost per element
- Manufactured and sourced in the USA — Detroit, Michigan facility
- Same-day shipping on in-stock elements
- 200,000+ filter cross-references available
- Technical support: +1 (313) 915-4120
Questions? Call (313) 915-4120 or email sales@hydrafil.com
Pall and HC7500SDP4Z are trademarks of their respective owners, referenced here solely for cross-reference and compatibility identification purposes.