MS21916-12-10

FITTING REDUCER
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About this product
The MS21916-12-10 is a precision, flareless tube fitting reducer that seamlessly transitions 3⁄8″ (9.5 mm) tubing to 5⁄16″ (8 mm) tubing without requiring any tube flaring tools. Machined from aerospace-grade aluminum alloy and finished with a corrosion-resistant anodized surface, it features an integrated elastomer O-ring seal for dependable, leak-proof performance. Its compact, one-piece design simplifies routing in tight aircraft bays and minimizes fluid path disruptions.
MS21916-12-10 Datasheet
UOM: EA
Stock Location: Dubai
Hazardous Item: Non-Hazardous Item
Lead Time: Stock
Certification: TRI RELEASE 8130
8130/EASA Eligible: Yes
PRODUCT DESCRIPTION

MS21916-12-10

  • Flareless Connection: Eliminates the need for specialized flaring tools by creating metal-to-metal and O-ring seals on smooth tube ends.

  • Lightweight Aluminum Alloy: Provides strength and durability while keeping added weight to a minimum in fluid and air systems.

  • Integrated O-Ring Seal: The built-in seal crushes lightly against tubing to form a reliable barrier against leaks.

  • Tool-Friendly Installation: Simply slide the fitting over the tubes and tighten with a common wrench without any need for adapters.


  • Steps down main hydraulic supply lines to smaller test-hose connections when servicing landing-gear actuators on the tarmac.

  • Adapts primary filter inlet tubes to fine-bore sampling probes for quality checks during refueling operations.

  • Joins bleed-air delivery lines of ground-support air-conditioning units to duct assemblies in maintenance hangars.

  • Transitions from reservoir-sized tubing to brake-line hoses, ensuring precise fluid flow during brake system bleeding.


  • Do I need special tools to install this fitting?

No, installation requires only a standard open-end or adjustable wrench sized for the fitting’s hex flats.

  • Will it seal tubing that hasn’t been flared?

Yes, the combination of the flareless grip ring and O-ring provides a tight seal on properly cut, deburred tube ends.

  •  Is the fitting reusable if disassembled?

Yes, after disassembly, inspect the O-ring for nicks or deformation. If it remains in good condition, the fitting can be reinstalled.


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