1/4 in. x 1/4 in. Push-In x Male NPT 45 DOT Swivel Elbow
1/4 in. x 1/4 in. Push-In x Male NPT 45 DOT Swivel Elbow
Overview
The 540404S is a 1/4 in. tube OD x 1/4 in. male NPT 45-degree swivel elbow in brass, letting you route 1/4 in. nylon air-brake tubing around obstructions while the swivel body tightens onto a 1/4-18 NPT port. Built for DOT FMVSS-571.106 air brake systems, it carries a 3/8 in. hex and is rated to 150 psi from -40°F to 200°F.
Technical Specifications
| MPN | 540404S |
| Fitting Type | 45-deg Swivel Elbow |
| Connection 1 | 1/4 in. Tube OD |
| Connection 2 | 1/4 in. Male NPT (1/4-18) |
| Hex Size | 3/8 in. |
| Pressure Rating | 150 psi |
| Temperature Range | -40°F to 200°F |
Materials of Construction
| Body | Brass |
| Collet / Seal | Composite collet, O-ring seal |
Typical Applications
Connects 1/4 in. nylon air brake tubing to a 1/4 in. NPT port at a 45-degree angle on trucks, trailers, and buses, with the swivel allowing the tube run to be clocked after the threads are sealed.
Cross-Reference and Interchange
This 1/4 in. DOT swivel elbow cross-references to these competitor and industry part numbers: 02554-0404, 179PMT-4-4, 1880X4X4S, 2480x4x4, 279PCS-4x4, 279PPSDOT-4B, 279PPSDOT-4B-Y, 980-4-4PXDOTS, AQ54-DOTS-4X4, D7054DTS-4B, DQ54DOTS-4X4, NP79SW-4-4, PC1474SW-4B, PL1374-4B, PP78SCC-DOT, S254PMT-4-4. 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
- Push-to-Connect Fittings Selection Guide
- NPT Thread Tightening: Turns Past Hand-Tight
- Teflon Tape vs. Pipe Dope
- Pipe Size Reference Chart
FAQ
Why a swivel elbow?
The swivel lets you seal the NPT thread first, then rotate the tube leg to its final angle without unsealing.
Is it DOT approved?
Yes, for DOT FMVSS-571.106 / SAE J1131 air brake systems.
What thread does the male end use?
1/4-18 NPT.
WARNING: This product can expose you to chemicals including lead, 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.