Tube Fittings
Double Ferrules Male Connector
High-pressure male connector for leak-free tube-to-thread integration. Rolled 316SS threads for maximum strength. Swagelok & Parker compatible. Silver-plated nuts for 20+ remakes. 24h quote!
Double Ferrules Male Connector: Tube to Thread High-Integrity Integration
Create a robust, leak-free transition from tubing to threaded components. The Stark Double Ferrules Male Connector (SS-MC) is engineered to provide a secure, reliable connection between a tube line and a female threaded port on a valve, manifold, or instrument. Our one-piece forged 316/316L stainless steel design, combined with precision-rolled threads, ensures maximum structural integrity and a gas-tight seal for your most critical system integrations.
✓ Precision Rolled Threads | ✓ 20+ Reassembly Cycles | ✓ Zero-Leak Performance Guarantee
🔧 Find Your Connector Size in 3 Clicks
1. Select Tube O.D. | 2. Select Thread Type | 3. Select Thread Size
🔥 Most Popular Configurations (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-MC-FT4-MN4 | SS-MC-FT8-MN8 | SS-MC-MT6-MN4 | SS-MC-MT12-MN8 |
Part Number Format: [Material]-MC-[Tube Size]-[Thread Size] (e.g., INC625-MC-FT4-MN4)
(MC = Male Connector)
(FT / MT = Sizing System (Fractional Tube / Metric Tube))
🛠 The Engineering Advantage
- Superior Strength with Rolled Threads: Unlike standard cut threads, Stark threads are rolled to compact the metal grain. This creates a smoother, harder surface that eliminates burrs, reduces galling, and provides a significantly stronger mechanical bond.
- One-Piece Forged Body: Our monolithic design eliminates potential weak points found in multi-piece or welded connectors, offering maximum resistance to system pressure, high-frequency vibration, and installation torque.
- Anti-Galling Silver-Plated Nuts: Every tube-side nut is internally silver-plated as standard. This acts as a permanent solid lubricant, ensuring the fitting can be reliably disassembled and reassembled 20+ times without thread seizing.
- 100% Interchangeability: Fully dimensionally and functionally compatible with Swagelok® and Parker A-LOK® male connectors—the perfect, cost-effective choice for MRO and high-performance system builds.
[Image Suggestion: A split-view render showing the precision-rolled male threads on one side and the double-ferrule grip on the other.]
📈 Technical Specifications & Thread Guide
Feature | Stark Standard Specification | Optional Advanced Upgrades |
Body Material | Forged 316/316L Stainless Steel | Duplex 2205, Super Duplex 2507, Alloy 625, Hastelloy C276, Monel 400, etc. |
Thread Types | NPT, BSPT (RT), BSPP (RS/RP), SAE/UNF | Metric, NPT Fine, Custom Threads |
Pressure Rating | Up to 10,000 PSI (689 bar) | Custom High-Pressure Designs |
Compliance | MTR to EN 10204 3.1 & PMI Verified | NACE MR0175 / NORSOK M-650 |
Thread Identification & Sealing
Thread Standard | Description | Sealing Method |
NPT / BSPT | Tapered Threads | Thread-to-thread contact; Requires Sealant (PTFE Tape) |
BSPP (G) | Parallel Threads | Uses a gasket, O-ring, or bonded washer |
SAE / MS | Straight Threads | O-Ring Boss (ORB) seal |
🎯 Targeted Application Support
- Instrument Integration: Connecting pressure gauges, transmitters, and sensors to process manifolds.
- Valve Connections: Securely joining tubing to the inlet/outlet ports of ball valves or needle valves.
- OEM Equipment: Integrated by machinery builders to provide reliable, standardized customer connection points.
- Hydrogen & High-Pressure Gas: Precision threads ensure gas-tight performance in refueling panels and gas cabinets.
❓ Frequently Asked Questions (FAQ)
Q1: What is the difference between NPT and BSPT threads?
NPT (National Pipe Taper) is the American standard with a 60° thread angle. BSPT (ISO 7/1) is the British/International standard with a 55° thread angle. They are not interchangeable, and mixing them will result in leaks and thread damage.
Q2: Do I need thread sealant for all male connectors?
Only for tapered threads (NPT and BSPT). Parallel threads, such as BSPP or SAE, rely on an O-ring or gasket and do not require tape or liquid sealant on the threads.
Q3: How do I read your part numbers?
Our system is logical: SS-MC-FT4-NPT4 = SS (316SS) - MC (Male Connector) - FT4 (1/4" Tube) - NPT4 (1/4" NPT Thread).
Q4: Are these connectors suitable for high-vibration environments?
Yes. The combination of our forged body and rolled threads provides exceptional fatigue resistance, making them ideal for use on pumps, compressors, and engine skids.
📦 Complete Size & Cross-Reference Chart
Fractional Tube x NPT Thread
Tube O.D. (in.) | NPT Size | Stark Part No. | Swagelok® Ref | Parker A-LOK® Ref |
1/16 | 1/16 | SS-MC-FT1-MN1 | SS-100-1-1 | 1MSC1N |
1/16 | 1/8 | SS-MC-FT1-MN2 | SS-100-1-2 | 1MSC2N |
1/16 | 1/4 | SS-MC-FT1-MN4 | SS-100-1-4 | 1MSC4N |
1/8 | 1/16 | SS-MC-FT2-MN1 | SS-200-1-1 | 2MSC1N |
1/8 | 1/8 | SS-MC-FT2-MN2 | SS-200-1-2 | 2MSC2N |
1/8 | 1/4 | SS-MC-FT2-MN4 | SS-200-1-4 | 2MSC4N |
1/8 | 3/8 | SS-MC-FT2-MN6 | SS-200-1-6 | 2MSC6N |
1/8 | 1/2 | SS-MC-FT2-MN8 | SS-200-1-8 | 2MSC8N |
3/16 | 1/8 | SS-MC-FT3-MN2 | SS-300-1-2 | 3MSC2N |
3/16 | 1/4 | SS-MC-FT3-MN4 | SS-300-1-4 | 3MSC4N |
1/4 | 1/16 | SS-MC-FT4-MN1 | SS-400-1-1 | 4MSC1N |
1/4 | 1/8 | SS-MC-FT4-MN2 | SS-400-1-2 | 4MSC2N |
1/4 | 1/4 | SS-MC-FT4-MN4 | SS-400-1-4 | 4MSC4N |
1/4 | 3/8 | SS-MC-FT4-MN6 | SS-400-1-6 | 4MSC6N |
1/4 | 1/2 | SS-MC-FT4-MN8 | SS-400-1-8 | 4MSC8N |
1/4 | 3/4 | SS-MC-FT4-MN12 | SS-400-1-12 | 4MSC12N |
5/16 | 1/8 | SS-MC-FT5-MN2 | SS-500-1-2 | 5MSC2N |
5/16 | 1/4 | SS-MC-FT5-MN4 | SS-500-1-4 | 5MSC4N |
5/16 | 3/8 | SS-MC-FT5-MN6 | SS-500-1-6 | 5MSC6N |
5/16 | 1/2 | SS-MC-FT5-MN8 | SS-500-1-8 | 5MSC8N |
3/8 | 1/8 | SS-MC-FT6-MN2 | SS-600-1-2 | 6MSC2N |
3/8 | 1/4 | SS-MC-FT6-MN4 | SS-600-1-4 | 6MSC4N |
3/8 | 3/8 | SS-MC-FT6-MN6 | SS-600-1-6 | 6MSC6N |
3/8 | 1/2 | SS-MC-FT6-MN8 | SS-600-1-8 | 6MSC8N |
3/8 | 3/4 | SS-MC-FT6-MN12 | SS-600-1-12 | 6MSC12N |
3/8 | 1 | SS-MC-FT6-MN16 | SS-600-1-16 | 6MSC16N |
1/2 | 1/8 | SS-MC-FT8-MN2 | SS-810-1-2 | 8MSC2N |
1/2 | 1/4 | SS-MC-FT8-MN4 | SS-810-1-4 | 8MSC4N |
1/2 | 3/8 | SS-MC-FT8-MN6 | SS-810-1-6 | 8MSC6N |
1/2 | 1/2 | SS-MC-FT8-MN8 | SS-810-1-8 | 8MSC8N |
1/2 | 3/4 | SS-MC-FT8-MN12 | SS-810-1-12 | 8MSC12N |
1/2 | 1 | SS-MC-FT8-MN16 | SS-810-1-16 | 8MSC16N |
5/8 | 1/4 | SS-MC-FT10-MN4 | SS-1010-1-4 | 10MSC4N |
5/8 | 3/8 | SS-MC-FT10-MN6 | SS-1010-1-6 | 10MSC6N |
5/8 | 1/2 | SS-MC-FT10-MN8 | SS-1010-1-8 | 10MSC8N |
5/8 | 3/4 | SS-MC-FT10-MN12 | SS-1010-1-12 | 10MSC12N |
3/4 | 3/8 | SS-MC-FT12-MN6 | SS-1210-1-6 | 12MSC6N |
3/4 | 1/2 | SS-MC-FT12-MN8 | SS-1210-1-8 | 12MSC8N |
3/4 | 3/4 | SS-MC-FT12-MN12 | SS-1210-1-12 | 12MSC12N |
3/4 | 1 | SS-MC-FT12-MN16 | SS-1210-1-16 | 12MSC16N |
7/8 | 1/2 | SS-MC-FT14-MN8 | SS-1410-1-8 | 14MSC8N |
7/8 | 3/4 | SS-MC-FT14-MN12 | SS-1410-1-12 | 14MSC12N |
7/8 | 1 | SS-MC-FT14-MN16 | SS-1410-1-16 | 14MSC16N |
1 | 1/2 | SS-MC-FT16-MN8 | SS-1610-1-8 | 16MSC8N |
1 | 3/4 | SS-MC-FT16-MN12 | SS-1610-1-12 | 16MSC12N |
1 | 1 | SS-MC-FT16-MN16 | SS-1610-1-16 | 16MSC16N |
1 1/8 | 1 | SS-MC-FT18-MN16 | B-1810-1-16 | - |
1 1/4 | 1 | SS-MC-FT20-MN16 | SS-2000-1-16 | - |
1 1/4 | 1 1/4 | SS-MC-FT20-MN20 | SS-2000-1-20 | 20MSC20N |
1 1/2 | 1 1/2 | SS-MC-FT24-MN24 | SS-2400-1-24 | 24MSC24N |
2 | 2 | SS-MC-FT32-MN32 | SS-3200-1-32 | 32MSC32N |
Metric Tube x NPT Thread
Tube O.D. (mm) | NPT Size | Stark Part No. | Swagelok® Ref | Parker A-LOK® Ref |
|---|---|---|---|---|
2 | 1/8 | SS-MC-MT2-MN2 | SS-2M0-1-2 | M2MSC1/8N |
3 | 1/8 | SS-MC-MT3-MN2 | SS-3M0-1-2 | M3MSC1/8N |
3 | 1/4 | SS-MC-MT3-MN4 | SS-3M0-1-4 | M3MSC1/4N |
4 | 1/8 | SS-MC-MT4-MN2 | SS-4M0-1-2 | M4MSC1/8N |
4 | 1/4 | SS-MC-MT4-MN4 | SS-4M0-1-4 | M4MSC1/4N |
6 | 1/8 | SS-MC-MT6-MN2 | SS-6M0-1-2 | M6MSC1/8N |
6 | 1/4 | SS-MC-MT6-MN4 | SS-6M0-1-4 | M6MSC1/4N |
6 | 3/8 | SS-MC-MT6-MN6 | SS-6M0-1-6 | M6MSC3/8N |
8 | 1/8 | SS-MC-MT8-MN2 | SS-8M0-1-2 | M8MSC1/8N |
8 | 1/4 | SS-MC-MT8-MN4 | SS-8M0-1-4 | M8MSC1/4N |
8 | 3/8 | SS-MC-MT8-MN6 | SS-8M0-1-6 | M8MSC3/8N |
10 | 1/4 | SS-MC-MT10-MN4 | SS-10M0-1-4 | M10MSC1/4N |
10 | 3/8 | SS-MC-MT10-MN6 | SS-10M0-1-6 | M10MSC3/8N |
10 | 1/2 | SS-MC-MT10-MN8 | SS-10M0-1-8 | M10MSC1/2N |
12 | 1/4 | SS-MC-MT12-MN4 | SS-12M0-1-4 | M12MSC1/4N |
12 | 3/8 | SS-MC-MT12-MN6 | SS-12M0-1-6 | M12MSC3/8N |
12 | 1/2 | SS-MC-MT12-MN8 | SS-12M0-1-8 | M12MSC1/2N |
12 | 3/4 | SS-MC-MT12-MN12 | SS-12M0-1-12 | M12MSC3/4N |
14 | 1/8 | SS-MC-MT14-MN2 | SS-14M0-1-2 | M14MSC1/8N |
14 | 1/4 | SS-MC-MT14-MN4 | SS-14M0-1-4 | M14MSC1/4N |
14 | 3/8 | SS-MC-MT14-MN6 | SS-14M0-1-6 | M14MSC3/8N |
14 | 1/2 | SS-MC-MT14-MN8 | SS-14M0-1-8 | M14MSC1/2N |
14 | 3/4 | SS-MC-MT14-MN12 | SS-14M0-1-12 | M14MSC3/4N |
15 | 1/2 | SS-MC-MT15-MN8 | SS-15M0-1-8 | M15MSC1/2N |
15 | 3/4 | SS-MC-MT15-MN12 | SS-15M0-1-12 | M15MSC3/4N |
16 | 1/4 | SS-MC-MT16-MN4 | SS-16M0-1-4 | M16MSC1/4N |
16 | 3/8 | SS-MC-MT16-MN6 | SS-16M0-1-6 | M16MSC3/8N |
16 | 1/2 | SS-MC-MT16-MN8 | SS-16M0-1-8 | M16MSC1/2N |
16 | 3/4 | SS-MC-MT16-MN12 | SS-16M0-1-12 | M16MSC3/4N |
18 | 3/8 | SS-MC-MT18-MN6 | SS-18M0-1-6 | M18MSC3/8N |
18 | 1/2 | SS-MC-MT18-MN8 | SS-18M0-1-8 | M18MSC1/2N |
18 | 3/4 | SS-MC-MT18-MN12 | SS-18M0-1-12 | M18MSC3/4N |
20 | 1/2 | SS-MC-MT20-MN8 | SS-20M0-1-8 | M20MSC1/2N |
20 | 3/4 | SS-MC-MT20-MN12 | SS-20M0-1-12 | M20MSC3/4N |
20 | 1 | SS-MC-MT20-MN16 | SS-20M0-1-16 | M20MSC1N |
22 | 1/2 | SS-MC-MT22-MN8 | SS-22M0-1-8 | M22MSC1/2N |
22 | 3/4 | SS-MC-MT22-MN12 | SS-22M0-1-12 | M22MSC3/4N |
22 | 1 | SS-MC-MT22-MN16 | SS-22M0-1-16 | M22MSC1N |
25 | 1/2 | -MC-MT25-MN8 | SS-25M0-1-8 | M25MSC1/2N |
25 | 3/4 | SS-MC-MT25-MN12 | SS-25M0-1-12 | M25MSC3/4N |
25 | 1 | SS-MC-MT25-MN16 | SS-25M0-1-16 | M25MSC1N |
28 | 1 | SS-MC-MT28-MN16 | SS-28M0-1-16 | M28MSC1N |
28 | 1 1/4 | -MC-MT28-MN20 | SS-28M0-1-20 | — |
30 | 1 1/4 | SS-MC-MT30-MN20 | SS-30M0-1-20 | — |
32 | 1 1/4 | SS-MC-MT32-MN20 | SS-32M0-1-20 | — |
38 | 1 1/2 | SS-MC-MT38-MN24 | SS-38M0-1-24 | — |
💬 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.