# HCS Series (HCS)

> Fil-Trek Oil & Fuel Filters. Canonical page: https://www.fil-trek.com/products/oil-fuel-filters/hcs

Category: Oil & Fuel Filters
Series: HCS
Model format: `HCS-[SIZE CODE]-[MICRON]-[OPTIONS]`
Example: `HCS-636-1`

## Overview
Premium synthetic media cartridges offering absolute-rated filtration for water-based and aggressive fluid applications

## How It Works
Fluid flows outside-to-in through synthetic fibers (polyester or microglass), removing 99.5% of contaminants without media degradation or swelling

## Applications
- Water-based lubricants and fluids
- Aggressive chemical processing
- Industrial water filtration
- Fluids requiring high-purity specifications

## Physical Specifications
- **flow direction:** Outside-to-inside
- **backwash-able:** No
- **outside diameter options:** 2.5", 4.5", 6.0"
- **inner diameter options:** 1.10", 1.75", 3.50", 2.625"
- **nominal length options:** 9.875", 11", 18", 36"
- **caps materials:** Plated Steel
- **cores materials:** Plated Steel
- **size options:** 209, 511, 518, 618, 636, 718, 736

## Media Specifications
- **media primary options:** Microglass, Microglass/Polyester Blend, Polyester
- **micron ratings:** 0.5, 1, 3, 5, 10, 25, 40
- **efficiency percent:** 99.5%
- **media rating:** Absolute
- **changeout dp:** 20 PSID
- **burst pressure:** 75 PSID
- **max temperature:** 275°F
- **approvals certifications:** None

## Housing Compatibility
- Fil-Trek VF Series

## Ordering
- Model format: `HCS-[SIZE CODE]-[MICRON]-[OPTIONS]`
- Examples:
  - `HCS-636-1`
  - `HCS-618-5-VI`

### Option codes
- **VI:** Viton gasket
- **DZ:** Custom ID
- **W:** Outer steel wrap
- **H:** Handle

### Size codes
- **209:** OD 2.5", ID 1.1", length 9.875"
- **511:** OD 4.5", ID 1.75", length 11"
- **518:** OD 4.5", ID 1.75", length 18"
- **618:** OD 6", ID 3.5", length 18"
- **636:** OD 6", ID 3.5", length 36"
- **718:** OD 6", ID 2.625", length 18"
- **736:** OD 6", ID 2.625", length 36"

### Micron ratings
- 0.5, 1, 3, 5, 10, 25, 40

## Contact
- **sales@fil-trek.com** — all filtration product inquiries, projects, filter housings, and filtration systems
- **filters@fil-trek.com** — replacement filter media, filter elements, filter bags, hardware, and spare parts

## Links
- HTML: https://www.fil-trek.com/products/oil-fuel-filters/hcs
- Markdown: https://www.fil-trek.com/products/oil-fuel-filters/hcs.md