1/8 in. x 1/16 in. Compression x Male NPT Adapter
1/8 in. x 1/16 in. Compression x Male NPT Adapter
Overview
The Midland 18175 is a brass adapter with a 1/8 in. compression inlet and a 1/16 in. male NPTF outlet, on 5/16-24 and 1/16-27 threads with a 0.37 in. hex. It transitions 1/8 in. OD tubing into a tiny 1/16 in. dryseal NPTF port, a common need on gauges, instruments, and miniature pneumatic or hydraulic assemblies.
Technical Specifications
| Part Number | 18175 |
| Tube Size | 1/8 in. compression |
| Thread Size | 1/16 in. male NPTF (5/16-24 x 1/16-27) |
| Hex Size | 0.37 in. |
| Fitting Type | Adapter |
| Material | Brass |
| Pressure Rating | 400 psi |
| Temperature Rating | -65°F to 250°F |
Materials of Construction
| Body | Brass |
| Nut & Sleeve | Brass |
| For Use With | Copper, aluminum, and thermoplastic tubing |
Typical Applications
Used where 1/8 in. tubing must connect to a 1/16 in. NPTF port on pressure gauges, transducers, small instruments, and miniature fluid-power blocks. The dryseal NPTF thread and 400 psi brass body make it a reliable pick for compressed air, oil, and instrument lines in tight equipment spaces.
Cross-Reference and Interchange
This brass compression adapter cross-references to these competitor and industry part numbers: 268X2X1, 6821, 68-2-1, 68A-2X, 68X2X1, 86821, 868-2-1. Replacing one of these? Match nominal size, connections, and rating, or send us your part number and we will confirm the interchange.
Sizing and Installation Resources
- Compression Fitting Sizing Chart
- Brass Fitting Types and Sizes Guide
- NPT, BSPP, and JIC Thread Identification Guide
- NPT Thread Tightening: Turns Past Hand-Tight
- Teflon Tape vs. Pipe Dope
Frequently Asked Questions
What is NPTF and does it need tape?
NPTF is a dryseal thread that seals metal-to-metal; PTFE tape or pipe dope is optional but commonly added for extra assurance.
What tubing fits the compression end?
1/8 in. OD copper, aluminum, or thermoplastic tubing seats into the brass sleeve.
What is the pressure rating?
400 psi, over a -65°F to 250°F temperature range.
WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.