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Studies of tubing failure resulting from vibration have shown this failure in the majority of cases to be caused by fracture of the tubing at the point of connection.These fractures are the result of either fatigue of the metal caused by constant vibration and shock, or of distortion of the tube in making the joint.

The Pioneer Vibra-Lok fitting makes a joint that is virtually indestructible by vibration and will withstand considerable shock and major tube movement. In the Vibra-Lok fitting. The tubing is cushioned against all such damage by the  elastic sleeve.

The sleeve of the Vibra-Lok fitting is made of a special composition Buna-N elastic sealing materials. This elastic sleeve  forms a cushion between tubing and fitting. It assures a positive, pressure tight seal, permits the tube to flex back and forth in the fitting. Seal design compensate for tube misalignment and tube surface defects during assembly. Special Vibra-Lok sleeves resist deterioration and retain flexibility over a wide temperature range.

     Sizes :

Tube Size 3/16" 1/4" 1/4" 5/16" 3/8" 3/8" 3/8" 1/2" 1/2" 5/8"
Thread Size 1/8" 1/8" 1/4" 1/4" 1/8" 1/4" 3/8" 3/8" 1/2" 1/2"

Fittings available


Straight Connectors, Stud Elbow, Branch Tee, Run Tee, Female Stud, Union-Straight Elbow Tee -  Available in above tube size & thread size combination.

Maximum Working Pressure


1000 psi


Elbows and Tees : Brass Forgings - S.A.E. Ca377 
Connectors, Unions, Nuts : Stress relieved bar stock - S.A.E. 360
Sleeves : Special elastic sealing material Buna-N used for temperatures from sub-zero to 275oF / 135oC. The sleeve has extreme resistance to deterioration by oil and gasoline. High temperature sleeves made of Viton for use from sub-zero to 450oF / 232oC. Sleeves are compatible for gasoline, oil, diesel fuel, lubricants, vacuum, air and water service.

Compatible Tubing


All types of seamed and seamless metal tubing Copper, Aluminum, Thin Wall Steel (Bundy or G.M.), Stainless Steel and Glass.

Assembly Instructions For Lower pressure Applications


  1. Slip tube nut and sleeve over tube.
  2. Insert tubing in fitting body as far as it will go and tighten nut until stop is reached.Cut the tube cleanly and squarely removing all burns.
  3. There is no danger of overt-tightening. The elastic sleeve ordinarily will extrude slightly around the tube at the end of the nut. This extrusion further aids in isolating the tube from the nut.
Assembly Instructions For Higher pressure Applications


  1. Consult pressure chart to determine if tubing should be belled for your particular application. FIG A.
  2. Slip the nut and sleeve over tubing. The sleeve should be positioned near end of tubing Applications just behind the surface to be belled. FIG. B.
  3. Bell tubing with standard 45 o flaring tool or 90 o punch. The size of bell should be approximately that shown in FIG. C.
Remark Instructions


All Vibra-Lok fittings can be reassembled repeatedly. New sleeves can easily be added to retain original fitting performance. 


Condition - Static Pressure
Tube O.D. 3/16" 1/4" 5/16" 3/8" 1/2" 5/8"
Tube Not Belled in PSI 500 500 450 350 200 -
Tube Belled or Flared in PSI 1000 1000 900 700 500 400

Condition - Minor Surges and / or Vibration
Tube O.D. 3/16" 1/4" 5/16" 3/8" 1/2" 5/8"
Tube Not Belled in PSI 400 400 325 225 150 -
Tube Belled or Flared in PSI 800 800 700 500 375 300

Condition - Severe Vibration or Shock
Tube O.D. 3/16" 1/4" 5/16" 3/8" 1/2" 5/8"
Tube Not Belled in PSI 300 300 225 175 100 -
Tube Belled or Flared in PSI 600 600 500 400 250 100

  In high Pressure applications & Sizes larger than 1/2" OD, the tube end should belled or flared.

Sleeve Positions and Recommended Size of Bell :

Tube O.D. 1/8" 3/16" 1/4" 5/16" 3/8" 1/2" 5/8" 3/4" 7/8"
Bell Diameter 'C' .190-.160 .255-.255 .318-.288 .381-.351 .444-.414 .569-.539 .694-.664 .819.789 .944-.914

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