Tube Fittings
90° Double Ferrules Female Elbow
Stark 90° female elbow for compact, leak-free connections. Forged 316SS, Swagelok & Parker compatible. Ideal for mounting instruments at a right angle directly onto a tube line. 24h quote!
Double Ferrules Female Elbow Fitting: 90° High-Integrity Connector
Achieve a compact, leak-free 90° transition for your male-threaded components. The Stark Double Ferrules Female Elbow is engineered to connect instruments like gauges and sensors to a tube line at a right angle, eliminating the need for additional adapters and saving critical space. Our one-piece forged 316/316L stainless steel design provides maximum structural integrity, making it the ideal choice for robust installations in crowded panels and complex piping layouts.
✓ One-Piece Forged Body| ✓ Reduces System Leak Points| ✓ Zero-Leak Performance Guarantee
🔧 Find Your Elbow Size in 3 Clicks
1. Select Tube O.D.:○ 1/4" ○ 1/2" ○ 6mm ○ 12mm ...
2. Select Female Thread Type:○ NPT ○ BSPP ○ SAE/UNF ...
🔥 Most Popular Sizes (In Stock - Same Day Shipping)
1/4" Tube x 1/4" NPT | 1/2" Tube x 1/2" NPT | 6mm Tube x 1/4" NPT | 12mm Tube x 1/2" NPT |
SS-FE-FT4-FN4 | SS-FE-FT8-FN8 | SS-FE-MT6-FN4 | SS-FE-MT12-FN8 |
Part Number Format: [Material]-FE-[Tube Size]-[Thread Size] (e.g., INC625-FE-FT4-MN4)
(FE = Female Elbow)
(FT / MT = Sizing System (Fractional Tube / Metric Tube))
🛠 The Engineering Advantage
- System Simplification with One-Piece Design: By providing a direct 90° tube-to-female-thread connection, our elbow eliminates the need for a separate straight connector and a threaded elbow, reducing two potential leak paths to zero and creating a more compact, robust installation.
- Forged Body Integrity for Instrument Mounting: Our female elbows feature a heavy-wall forged body to safely handle the cantilevered load of instruments or gauges, ensuring long-term stability and resistance to vibration.
- Guaranteed Interchangeability: Designed for full dimensional and functional compatibility with Swagelok® and Parker A-LOK® female elbows, facilitating easy MRO replacements and seamless integration into existing systems.
- Reliable Reassembly with Anti-Galling Nuts: Every tube-side nut is internally silver-plated as a standard feature. This prevents thread seizing (galling) and ensures the tube connection can be reliably disassembled and reassembled 20+ timesfor maintenance.
📈 Technical Specifications
Feature | Stark Standard Specification | Optional Advanced Upgrades |
Body Material | Forged316/316L Stainless Steel | Duplex 2205, Super Duplex 2507, Inconel 625, Hastelloy C276, Monel 400, etc. |
Thread Types | NPT, BSPP (ISO 228/1), BSPT (ISO 7/1), SAE/UNF | Custom thread configurations |
Pressure Rating | Up to 10,000 PSI (689 bar) | Custom High-Pressure Configurations |
Testing | 100% Pneumatic Tested at 1.1x WP | Helium Leak Testing (1 x 10⁻⁹ sccs) |
Compliance | MTR to EN 10204 3.1 & PMI Verified | NACE MR0175 / NORSOK M-650 |
🎯 Why Choose a Stark Female Elbow? A Head-to-Head Comparison
Feature | Using a Straight Connector + Female Elbow | Using One Stark Forged Female Elbow |
Potential Leak Paths | ⚠️ 3 (1 tube, 2 thread) | ✅ 2 (1 tube, 1 thread) - 33% Reduction in Leak Risk |
Installation Time | ❌ High (Requires 2 components, alignment) | ✅ Low (Single component installation) |
Space Requirement | ❌ Larger, bulky footprint | ✅ Compact, Low-Profile 90° Design |
Vibration Resistance | ⚠️ Lower (extra stress on thread joint) | ✅ Superior (Monolithic Forged Body) |
📌 Targeted Application Support
- Instrument Mounting in Tight Spaces: The primary choice for mounting gauges, sensors, and transmitters where the tubing runs parallel to the mounting surface.
- Control Panel Layouts: Allows for neat, right-angled routing of tube lines from bulkhead connections to internal components.
- OEM Equipment Design: Provides a compact and robust connection point for instruments on machinery and process skids.
- Laboratory Setups: Ideal for creating clean, organized layouts for gas and liquid delivery systems.
❓ Frequently Asked Questions (FAQ)
Q1: What is the main advantage of using a female elbow?
The main advantage is system simplification and space-saving. By replacing two separate components with one, you reduce potential leak paths by 33%, lower your total installed cost, and allow for a much more compact and robust installation, especially in tight spaces.
Q2: Are your female elbows suitable for panel mounting?
Our standard female elbow is designed for in-line connections. For secure panel mounting, we offer a dedicated Bulkhead Female Elbowwhich features a longer body and a locknut. Please contact our engineering team for the correct part number.
Q3: How does the forged body handle the stress of an instrument mounted at a 90° angle?
The one-piece forged construction provides superior strength to handle the cantilevered load (the weight of the instrument hanging off the side). This prevents stress fractures and ensures the connection remains stable and leak-free over the long term.
Q4: Can I get this elbow with a combination of metric tube and imperial thread?
Yes.This is a very common requirement. We stock a wide range of metric-to-imperial and imperial-to-metric configurations to support global projects.
📦 Complete Size & Cross-Reference Chart
💬 Still Have Questions?
Our engineering team is ready to assist with technical selection, system design, or material recommendations.
🔒 Disclaimer
Swagelok® and Parker A-LOK® are registered trademarks of their respective holders. Stark is not affiliated with, endorsed by, or sponsored by these companies. Part numbers and brand names are provided for cross-reference and compatibility purposes only.