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Brass Nut With Sleeve 261Ub-03

$1.55/Piece
Part# 261UB-03
MFR Model# 26IU-B03
TypeTube O.D.Thread SizePart No.
261UB-Nut with Sleeve3/163/8-24261UB-03

Overview

Poly-Flo Flareless tube fittings consist of a brass body and nut with brass sleeve. Use with PolyFlo, PVC or Nylaflow pressure tubing. The Poly-Flo fittings have the same configuration as Nylo-Seal fittings of the same basic part number.
Note: The fittings are sold individually and not in pair. Brass Poly Flo fittings cannot be used with NSR tubing listed. Use SAE fittings, see Accessories tab.
   
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Reviews

A must have on hand along with some tubing when working on Cub Crafters brake lines.

Pierce A Verified Purchase

Brass Nut With Sleeve 261Ub-03

December 20, 2023

Worked perfectly (first time, no leaks) on my home built brake line.

Alan B Verified Purchase

Brass Nut With Sleeve 261Ub-03

October 14, 2023

Just what I needed for my project.

Kerry D Verified Purchase

Brass Nut With Sleeve 261Ub-03

August 12, 2023

These work great for brake line connections.

Gerald B Verified Purchase

Brass Nut With Sleeve 261Ub-03

March 21, 2023

Used to upgrade the brake system of my microlight FK9. Very easy to install, good quality.

Axel M Verified Purchase

Brass Nut With Sleeve 261Ub-03

August 24, 2021

I am not impressed. Once tightened it is difficult to untighten or tighten the nut with out twisting the Nylaflow tubing. The old style that used a feral in the Nylaflow tubing is amuch better design.

Jerry M Verified Purchase

Brass Nut With Sleeve 261Ub-03

June 29, 2021

FAST SERVICE, JUST WHAT I NEEDED.

Joe M
April 23, 2021

These brass fittings are smaller than the plastic ones, and clamp onto the tubing much better. Made the pitostatic install very nice.

David P
August 13, 2020

Have used these for years and they work well

Roland F
June 6, 2020

Hard to find this item anywhere - Aircraft Spruce had them! I had some trouble with sign in and online order, but phone conversation made the order work.

Bb
January 10, 2020

Q&A

Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Are these fittings reusable?

These can be re-used but they should be inspected before doing so. If there is damage to the fitting it should be replaced. It is at the discretion of the installer whether it should be replaced or not. We cannot, as a blanket statement, say they can all be reused.

Q: How should the brass Poly-Fittings assembled with the Nyla-Flow Tubing? What is the requirement for tighten them only finger tight? How is it ensured that once tightened it will not become loose and might leak?

You insert the tube into the nut and then tighten the nut on to the fitting. The vendor tightening spec is "finger tight, plus a 1/4 turn with a wrench."

Q: Can you provide the part no for these nuts with the nylon sleeves?

That would be the 268 model. Those have nylon inserts on the nuts on them.

Q: What is the maximum pressure rating for these fittings?

Up to 1200 psi.

Q: Is it necessary to use thread sealant on poly-flo fittings or will the brass-to-brass connection suffice to prevent leaks in brake applications?

No, sealant is not necessary.

Q: Is it needed to use brass tubing inside the nyla flow tubing where it is compressed at the fitting?

Yes, the brass Poly-flo fittings are required for Use with PolyFlo, PVC or Nylaflow pressure tubing

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