37 Flare Hydraulic Fitting Features And Installation

 
 
Instrumentation :: Tube Fittings :: Features& Installation
 
APPLICATION
PMT 37 degree flared Tube Fittings is compact and simple in design for assembly and assures maximum reliability and performance.
It is especially suited for low and medium wall tubing with good vibration resistance in a broad selection of types and sizes.
It is used in virtually every application that uses fluid power for motion control & automation.
 

 
DESIGN
 
PMT 37 degree flared Tube Fittings consist of three precision components such as Body, Sleeve and Nut. These components have been manufactured to very stringent tolerances under rigid quality control procedure approved to ISO 9001 : 2000.

PMT 37 degree flared Tube Fittings meets SAEJ514 Standard.

The Tube end is flared at a 37 degree angle and sandwiched between the fitting body nose (seat) and the sleeve with nut which provide a very effective leakproof joint, full flow connection in process tubing.

PMT 37 degree flared Tube Fittings are available as a standard in SS316 material, which meets the following specifications.
 
A. SS316 Bar Stock ASTM A-479
B. SS316 Forging ASTM A-182
Other materials are available on request.
 
PRESSURE RATING
PMT 37 degree flared Tube Fittings provide zero leak, full flow connection in hydraulic system operating at working pressure as specified below.
Allowable working pressure ratings are based on min. design factor 4:1 for dynamic and 3: 1 for static application.
 
Nom. Tube OD Inch 37° Flare Straight Thread Nom. Pipe Size SAE St. Threads Union and Bulkhead Fittings with Pipe Thread
1/8 5/16''x24 1/8'' 5000 5000
3/16 3/8"x24 1/8'' 5000 5000
1/4 7/16"x20 1/8'' 5000 5000
5/6 1/2"x20 1/8'' 5000 5000
3/8 9/16"x18 1/4" 5000 5000
1/2 3/4"x16 3/8" 4500 4000
5/8 7/8"x14 1/2" 3500 3000
3/4 1-1/16"x12 3/4" 3500 3000
7/8 1-3/16"x 12 3/4" 3500 2500
1 1-5/16"x12 1" 3500 2000
Note:- Since many factors influence the pressure at which a system will or will not perform satisfactorily. Details as shown in the above table are only guideline & not rigid.
 
AVAILABLE SIZES

 

Fractional Size Ranges from 1/8" through 1"
Metric Size Ranges from 6mm through 25 mm
 
QUALITY OF TUBING
Stainless Steel 316 or 304 seamless tubing should be fully annealed, according to Standard ASTM-269 suitable for bending and flaring. Length of finished tubing shall be reasonable straight and have smooth ends and free from burrs, scales and any kind of defect and scratches.
 
AVAILABLE SIZES
Due to variation in tube diameters for high pressure and safety systems, a common starting point is desirable. To achieve this ( a wrench snug up the nut until the tube cannot be rotated by hand. From this point the nut should be rotated one and a quarter turns.)
For sizes  upto  1/8"  in imperial  tube fittings  and 4  mm  in metric tube fittings  only  3/4  turn  from finger  tight  position  is necessary
 
Metric size ranges from: 4mm through 16mm Tube OD
Fractional size ranges from: 3/16" through 5/8" Tube OD.
Recommended tolerance on tube ±0.05 mm  
 
QUALITY OF TUBING
Stainless Steel 316 or 304 seamless tubing should be fully annealed, according to Standard ASTM-269 suitable for bending and flaring. Length of finished tubing shall be reasonable straight and have smooth ends and free from burrs, scales and any kind of defect and scratches.
 
ASSEMBLY INSTRUCTION
  • Ensure that the end of the tube is cut square within ±1 degree and remove the burrs and sharp edges.
  • Wipe the ID and the OD of the deburred Tube end properly.
  • Insert the nut and sleeve on to the tube as shown below
 
 
APPLICATION
 
Flare the Tube with a special flaring tool to 37 degree, dimensions of Flared Tube according to SAEJ533 standard as shown below
 
 
The Dimensions of the flared tube according to SAEJ533 are shown below
 
Nominal Tube O.D.
Inch
A
Single Flare Diameter
R S
E F
Inch mm Inch mm Inch mm
Max. Min. Max. Min. ±0.02 ±0.5 ±0.02 ±0.5
1/8 0.20 0.18 5.08 4.58 0.03 0.8 0.035 0.88
3/16 0.28 0.26 7.11 6.61 0.03 0.8 0.035 0.88
1/4 0.36 0.34 9.14 8.64 0.03 0.8 0.065 1.65
5/16 0.43 0.40 10.92 10.16 0.03 0.8 0.065 1.65
3/8 0.49 0.46 12.44 11.69 0.04 1.0 0.065 1.65
1/2 0.66 0.63 16.76 16.01 0.06 1.5 0.083 2.1
5/8 0.79 0.76 20.06 19.31 0.06 1.5 0.095 2.41
3/4 0.95 0.92 24.13 23.37 0.08 2.0 0.109 2.76
7/8 1.07 1.04 27.17 26.42 0.08 2.0 0.109 2.76
1 1.20 1.17 30.48 29.72 0.09 2.3 0.120 3.04
  Dimensions are for reference only, and are subject to change without notice.  
 
Screw the nut on the body until finger tight. Further tighten the nut with a wrench ¼'' turn in order to make a leakproof metal to metal sealing connection.
 
ORDERING INFORMATION
The Part Number describes fittings body only.
 
Example for Fractional Size : FLMC-250-250-N/E
FLMC 250 250 N E
Type of fittings Tube OD Pipe Thread Type of Thread Material
Male Connector 1/4'' 1/4'' NPT SS 316
Example: For Fractional size: FLMC-6-250-RT/E
FLMC 6 250 RT E
Type of fittings Tube OD Pipe Thread Type of Thread Material
Male Connector 6mm 1/4'' BSPT SS 316
   
Size Code Description:
Inch Metric
Size Code Size Code Size Code Size Code
1/8 125 5/8 625 3mm 3 15mm 15
3/16 187 3/4 750 4mm 4 16mm 16
1/4 250 7/8 875 6mm 6 18mm 18
5/16 312 1 1000 8mm 8 20mm 20
3/8 375     10mm 10 22mm 22
1/2 500     12mm 12 25mm 25
        14mm 14    
   
Material Code Description :
Type of Material Material Code
SS316 E
Carbon Steel CS
Viton® V
Buna-N B
Pipe Thread Description :
Thread Type Code
NPT Thread N
ISO Tapered Thread (BSPT) RT
SAE/MS Straight Thread SE
   
 
  PMT ENGINEERS  
 
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