Introduction
Filter end caps are critical components that seal, support, and connect filter cartridges to housings. They prevent bypass, ensure structural integrity, and enable easy installation.
We manufacture all mainstream end cap types for industrial, hydraulic, water, and air filters
Common materials for filter element end caps:
| Material | Key Benefits | Best For |
|---|---|---|
| Nylon (PA66/PA6) | Chemical resistance, low cost, moldable | Water filters, general industrial filters |
| Carbon Steel (SPCC) | High strength, stamping-friendly | Hydraulic, oil, dust filters |
| Stainless Steel (304/316L) | Corrosion resistance, high temp | Chemical, food, marine filters |
| Aluminum Alloy | Lightweight, heat dissipation | Automotive, aerospace, portable filters |
Manufacturing Processes
1. Injection Molding (for nylon)
- High-volume, precise dimensions, complex geometries
- Ideal for DOE, 222/226, U-shaped plastic end caps
2. CNC Machining (for metal)
- ±0.05mm tolerance, custom threads/grooves
- For threaded, 222/226 O-ring, high-precision metal end caps
3. Stamping & Deep Drawing (for metal)
- Cost-effective, high strength, uniform wall thickness
- For carbon steel/stainless steel DOE, pull-tab, snap-on end caps
Popular End Cap Types (with Standard Names)
1. DOE (Double Open End) End Caps
- Structure: Both ends open, flat face
- Applications: General filtration, 10/20/30/40” cartridges, knife-edge seal housings
- Keywords: DOE filter end cap, double open end cap, flat end cap
2. 222 / 226 O-ring End Caps (SOE)
- Structure: Single open end with 222 or 226 O-ring grooves; closed flat or fin end
- Applications: Sanitary, pharmaceutical, food & beverage filters
- Keywords: 222 end cap, 226 end cap, SOE filter end cap, O-ring end cap
3. Threaded End Caps
- Structure: Internal/external threads (M, BSP, UNF)
- Applications: Hydraulic filters, oil filters, spin-on cartridges
- Keywords: Threaded filter end cap, male/female thread cap, hydraulic filter end cap
4. Handle End Caps
- Structure: Integrated handle for easy removal
- Applications: Large flow filters, industrial water filters
- Keywords: Pull-tab end cap, handle end cap, easy-remove end cap
Why Choose Our Filter End Caps
- Full Compatibility: Fit all popular brands (Pall, Donaldson, Hengst, etc.)
- Custom Solutions: OEM/ODM available for special sizes, materials, and designs
- Quality Assurance: ISO 9001, RoHS compliance; strict dimensional control
- Fast Delivery: In-stock standard types; 7–15 days for custom orders
Applications
- Hydraulic Systems: Oil filters, return line filters, pressure filters
- Water Treatment: RO, pleated, melt-blown cartridges (10–40”)
- Air & Dust Collection: Industrial dust filters, HEPA filters, gas turbine filters
- Food & Beverage: Sanitary filters, beverage filtration, sterile processing
- Automotive: Air filters, fuel filters, cabin air filters
Contact Us
Need custom filter end caps or have technical questions? Contact our engineering team jarry@tianruiyeya.cn for free consultation and quotes.
Post time: Jun-12-2026