Brass Vibra-Lok Female Stud

A Brass Vibra-Lok Female Stud is a heavy-duty transition fitting that joins a smooth metal or plastic tube to a male-threaded pipe port. One end features a female tapered NPT or BSPT pipe thread, while the opposing end features a Vibra-Lok elastomeric cushioned tube connection. It allows engineers to mount pressure sensors, gauges, or male-threaded fittings onto vibrating lines without transmitting destructive vibrational harmonics.

Pressure transmitters and switches mounted to vibrating machinery often experience calibration drift or mechanical fatigue cracking at male thread necks. The Vibra-Lok Female Stud isolates these components because the incoming impulse tube is held within an elastomeric matrix (Buna-N or Viton) that dissipates up to 90% of dynamic vibration before it reaches the instrument threads.

Pioneer Industries provides Vibra-Lok sleeves in two distinct formulations: Standard Nitrile (Buna-N) for mineral oils, water, compressed air, and fuels between -35°C and +100°C (-30°F to +212°F); and High-Temperature Fluorocarbon (Viton / FKM) for synthetic lubricants, aggressive fuels, and elevated temperatures from -26°C to +204°C (-15°F to +400°F).

The fitting safely operates at working pressures up to 2,000 PSI (138 bar) in 1/8″ to 1/4″ tube OD sizes, 1,500 PSI (103 bar) in 5/16″ and 3/8″ OD, and up to 1,000 PSI (70 bar) in 1/2″ OD sizes. It is backed by a certified 4:1 burst safety factor per ASME B31.3. For vacuum applications, its 360-degree radial elastomeric seal holds vacuum down to 29.5 in. Hg.

When connecting a male pipe nipple or instrument thread into the female port, apply high-quality PTFE paste sealant or 2-3 wraps of PTFE tape to the male threads only. Thread the components together finger-tight, then tighten with wrenches 2 to 3 full turns past finger-tight until snug. Avoid over-torquing into the female brass hex to prevent thread splitting.

No. The tube end is 100% flareless. Cut the tubing square, deburr both inside and outside edges, slide the nut and elastomeric sleeve over the tube, push the tube into the fitting socket until it bottoms, and tighten the compression nut finger-tight plus exactly one full turn (360°) with an open-end wrench.

Yes. Unlike rigid metal ferrules that leak when tube surfaces exhibit minor scratches or axial misalignments, the resilient Vibra-Lok sleeve flows into micro-imperfections and easily accommodates up to 4 degrees of angular misalignment without weeping.

Yes. Because the elastomeric sleeve does not cut, bite, or swage a permanent ring into the tubing, the tube remains undamaged. The connection can be disconnected and reconnected repeatedly without trimming or replacing the tubing. If the sleeve shows signs of aging, it can be replaced in seconds.

Compatible tubing includes soft annealed and hard drawn copper, seamless aluminum, brass, seamless thin-wall hydraulic steel, and glass tubing. For flexible thermoplastic tubes like Nylon or Polyurethane, brass internal tube support inserts must be used to support the tube inner diameter.

Bodies are machined from ASTM B16 C36000 free-cutting brass or forged from BS 218 / CW617N brass. Every manufacturing batch undergoes 100% pneumatic underwater bubble testing at 10 bar and coordinate measuring inspection of threads, delivered with an authentic EN 10204 Type 3.1 Mill Test Certificate.