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Coning, Threading, & Seating Tools


 
Tube Series
Tubing Size, 
OD" x ID"
Coning Tool
Replacement Cutter Blade
Threading Tool
Replace-
ment Die
Replace-
ment Bushing
Seating Tool
2M-0.025
1/8 x 0.025
C-1992
B-3756
C-1990
A-3570
 
A-9800
3M-0.025
3/16 x 0.025
C-2188
B-3756
C-2190
A-4406
 
A-9800
4L-1
¼ x 1/16
C-2653
B-3756
A-3499
A-4102
 
A-8835
4L-1.5
¼ x 3/16
C-2653
B-3756
A-3499
A-4102
 
A-8835
5M-1
5/16 x 1/16
C-2193
B-3756
A-3501
B-4101
 
A-8835
6L-2
3/8 x 1/8
C-2654
B-3756
A-3503
B-4090
 
A-9151
6M-1
3/8 x 1/16
C-2654
B-3756
A-3503
B-4090
 
A-8835
8L-2
½ x 1/8
C-2655
B-3756
A-3505
B-4091
 
A-9151
9L-3
9/16 x 3/16
C-2656
B-3756
A-3507
B-4092
 
A-9831
9L-5
9/16 x 5/16
C-2656
B-3756
A-3507
B-4092
 
A-10929
12H-1
¾ x 1/16
 
 
D-1556-A
A-3609
B-2605-A
B-7431
12H-2
¾ x 2/16
 
 
D-1556-A
A-3609
B-2605-A
A-9151
15F-5
15/16 x 5/16
 
 
D-1556-B
A-4089
B-2605-B
 
15F-4
15/16 x ½
 
 
D-1556-C
A-6100
B-2605-C
 

Assembly of Fittings & Tubing

Before assembling into the finished tubing line, examine each joint to see that the sealing faces are free of damage from previous use or misuse and that they are free from dirt, chip and burrs. The mating surfaces should be smooth and clean. Remove burrs, especially on the inside of the tubing. Use a rose reamer or sharp correctly sized twist drill to enter the bore. DO NOT use a tapered reamer. Avoid damaging the coned ends as by dropping on a hard floor.

The tubing collar must be screwed onto the tubing end far enough to insure that it is the coned end which bottoms and not either the tubing collar or the coupling nut. DO NOT tighten excessively; to do so may ruin the seat or collapse the conical nose of the tubing, closing it off partially or completely.

Good alignment of tubing and fittings is a prerequisite; the heavier the tubing and the higher the pressure, the more essential this is. Tubing must enter fittings straight and not at an angle, otherwise sealing trouble is certain to follow. Cut and fit the tubing so that on releasing any one gland nut in the assembly, the parts will stay together and not spring apart. Except on long runs of tubing, some slight effort should be required to pull the joint apart.

To make up a joint seal, enter the cone into the fitting, hold in the aligned position until the coupling or gland nut is hand tightened, then use the wrench. It is better to err by too light a touch with the wrench, rather than to tighten too much, until experience has taught the technician the right torque.

It is good practice after preparing the ends of tubing, including deburring, to flush the tubes and fittings with a solvent such as trichlor-ethylene, then blow them out with clean dry air to remove any remaining particles. Failure to do this leads to malfunctioning valves, pumps, and other system components.

The smaller size of high pressure tubing may be bent at right angles to eliminate the need of extra joints and elbow fittings. A good rule of thumb is to bend the tubing so that the inside radius is approximately three times the outside diameter of the tubing.

WARNING - DO NOT hot bend the tubing. To do so weakens it and invites early failures.

Harwood Engineering Company, Incorporated – © May, 1999
455 South Street, Walpole, Massachusetts 02081
phone: 508-668-3600
fax: 508-660-2276
http://www.ultranet.com/~harwood/
email: harwood@ma.ultranet.com