DELPHI FITTINGS
Product Overview
The Delphi Fittings Part FS319 (and its variant FS319W, which may denote a weldable version or specific material characteristic) is an SAE O-Ring Face Seal (ORFS) Braze Sleeve. This precision component is essential for creating a permanent, flat sealing face on the end of a hydraulic tube, enabling it to connect to a female ORFS swivel nut fitting (like Delphi Part FS318). The sleeve is designed to be securely brazed or welded onto the tube end. Once attached, it provides the precisely machined flat surface against which the O-ring of a mating male ORFS fitting seals, forming a high-integrity, leak-proof connection. Manufactured from high-quality carbon steel suitable for brazing/welding and typically zinc-plated for corrosion resistance, the FS319 sleeve is a critical part of forming reliable ORFS tube end connections in accordance with SAE J1453 / ISO 8434-3 standards.
Key Features & Specifications
| Material | High-Grade Carbon Steel (suitable for brazing/welding processes) |
|---|---|
| Type | SAE O-Ring Face Seal (ORFS) Braze Sleeve / Weld Sleeve |
| Design | Cylindrical sleeve designed to be permanently attached to a tube end, providing the flat face required for ORFS sealing. FS319W may indicate a version specifically optimized or prepared for welding. |
| Compatibility | Designed to be used with an SAE ORFS Braze Nut (e.g., Delphi Part FS318) of the corresponding size. The assembled tube end then mates with a standard male ORFS fitting. |
| Sealing Surface | Provides the precision-machined flat face that the O-ring (from the mating male ORFS fitting) seals against when compressed by the female ORFS swivel nut. |
| Primary Function | To create a permanent, flat sealing face on a hydraulic tube end suitable for an O-Ring Face Seal connection when used with an ORFS swivel nut. |
| Standard | Conforms to dimensional and functional requirements of SAE J1453 / ISO 8434-3 for ORFS connections. |
| Plating & Finish | Cr3+ Trivalent Zinc Clear (ASTM B117 salt spray tested) |
| Reference Standard | SAE J1453 / ISO 8434-3 (O-Ring Face Seal Standard) |
| Sealing Mechanism | Elastomeric O-Ring Captive in Machined Face Groove Compressed Against Flat Mating Face |
Commonly Available Sizes (Part #FS319 Series)
Delphi Fittings manufactures standard and custom dash sizes for Part FS319. Engineering specifications, dimensions, and thread/flange sizes are detailed below:
| Delphi Part # | Size / Nominal Dimension | Standard Specification | Configuration |
|---|---|---|---|
| FS319-04 / FS319W-04 | For 1/4" Tube OD (to create a -04 ORFS end) | SAE Standard | Standard Production |
| FS319-06 / FS319W-06 | For 3/8" Tube OD (to create a -06 ORFS end) | SAE Standard | Standard Production |
| FS319-08 / FS319W-08 | For 1/2" Tube OD (to create a -08 ORFS end) | SAE Standard | Standard Production |
| FS319-10 / FS319W-10 | For 5/8" Tube OD (to create a -10 ORFS end) | SAE Standard | Standard Production |
| FS319-12 / FS319W-12 | For 3/4" Tube OD (to create a -12 ORFS end) | SAE Standard | Standard Production |
| FS319-16 / FS319W-16 | For 1" Tube OD (to create a -16 ORFS end) | SAE Standard | Standard Production |
Need non-standard dash sizes, custom flange drops, special port configurations, or alternative material grades (AISI 316 Stainless / Brass)? Delphi manufactures custom components to client blueprints.
Specific Applications & Hydraulic Circuit Routing
Part FS319 fittings provide reliable fluid power conveyance in demanding mobile and stationary equipment circuits:
- High-Vibration Mobile Equipment: Excavator booms, mining equipment, and hydrostatic drives where Part FS319 prevents hydraulic weeping under intense shock loads.
- Zero-Clearance Manifold Assembly: Flat face design allows slip-in component replacement without springing or spreading rigid hydraulic tubes.
- Extreme Pressure Impulse Circuits: Elastomeric face seal remains 100% leak-free throughout repetitive thermal cycles and impulse spikes.
Installation & Assembly Guidance
- O-Ring Retention Inspection: Inspect the machined face groove to ensure the O-ring is properly seated and retained prior to mating.
- Face-to-Face Alignment: Bring the flat faces into parallel contact before hand-threading the swivel nut to avoid pinching the O-ring.
- Calibrated Torque Tightening: Tighten the nut to the specified SAE J1453 torque value using a calibrated torque wrench.
- Dual-Wrench Counter-Torque: Always hold the fitting body hex with a backup wrench while torquing the connection to prevent twisting.
Why Source Part FS319 from Delphi Fittings?
- Strict Dimensional Precision: CNC machined to exacting tolerances for 100% interchangeability with North American and international systems.
- ASTM B117 Salt Spray Corrosion Protection: Electroplated with eco-friendly Cr3+ trivalent zinc clear for extended service life in harsh operating environments.
- 100% Thread & Seal Inspection: Every production batch undergoes strict optical and mechanical gauge inspection before packaging.
- Factory-Direct OEM Supply: Direct manufacturer pricing, full mill test reports (MTR), and ISO 9001:2015 quality assurance from Yuhuan, China.
Get a Quote for Part FS319 - SAE ORFS Braze Sleeve
Direct OEM container-load and distributor replenishment pricing, complete material test reports (MTR), and inspection samples available upon inquiry. Connect with our engineering sales team for rapid quotations and delivery schedules.
Complementary & Mating Hydraulic Fittings
Commonly paired with Part FS319 in hydraulic valve manifolds, power units, and industrial fluid power circuits:
