20221 (20-221) by Midland | Flareless Fitting | Poly-Flo® Nut | 5/16" Tube OD | 7/16-24 Thread | Brass

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Midland Industries
Brass Fitting - Flareless Fitting - Poly-Flo® Nut - Brass

Flareless Brass Tube Fittings are Interchangeable with Poly-Flo®, Poly-Tite®, Poly-Line® and Poly-Fit®

Built-in SS Tube Support

Specifications for Variant SKU: 20221 Midland
Material(s):	Brass

Applications:	Pneumatic instrumentation circuits, lubricant and cooling lines.	Used With:	Aluminum & copper tubing. Hard plastic tubing requires brass sleeve. Not recommended for steel tubing.
SAE Rating:	N/A	Conformance:	N/A
Vibration:	Excellent Resistance.	Temperature Range:	Depends on tubing used. -65°F to +250°F (-53°C to +121°C) with brass sleeve -40°F to +150°F (-40°C to +66°C) with plastic sleeve. (Refer to tubing temperature range.)
Tolerance:	+/- .02 on all dimensions.	Lead Free:	Not Lead Free

Working Pressure and Temperature Ranges:

Up to 150 PSI from 0°F to + 150°F with thermoplastic tubing. Up to 300 PSI from 0°F to + 175°F with soft metal tubing.

Maximum allowable metal tube wall thickness for use with Poly-Tite® fittings::

1/8", 3/16" O.D. -- no limitation
1/4" O.D.--.035 5/16", 3/8",1/2" O.D.--.049

Assembly Instructions:

1) Cut tubing to desired length.
2) Slide nut/sleeve assembly on tube. Threaded end "A" of nut must face toward fitting.
3) Bottom tubing into fitting.
4) Plastic sleeve - Tighten nut hand tight.
Brass Sleeve - Tighten nut hand tight, then an additional 3/4 turn.

Tube OD	1/8"	3/16"	1/4"	5/16"	3/8"	1/2"
Thread Size - B	5/16-24	3/8-24	3/8-24	7/16-24	1/2-24	11/16-20

**Note: 1/8 and 3/16 sizes have brass sleeves**

Crossover Series:
MP61	261PFN	61PN	1261	261FPN


Part Number	Tube O.D	Thread	A	Hex (Dia.)	Approx. Weight (Lbs.)
20218 (20-218)	1/8"	5/16-24	0.37"	0.37"	0.01
20220 (20-220)	1/4"	3/8-24	0.34"	0.44"	0.02
20221 (20-221)	5/16"	7/16-24	0.34"	0.50"	0.02
20222 (20-222)	3/8"	1/2-24	0.38"	0.56"	0.04
20223 (20-223)	1/2"	11/16-20	0.42"	0.81"	0.06

Dimension data can change without notice.

Midland Industries

Midland Industries is a family of brands recognizable industry wide. Midland is a supplier of brass fittings, valves, and accessories for hose, pipe and tube in brass, bronze, stainless steel, steel, malleable iron, and plastics.

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