WELL NUT / JACK NUT

description

A well nut, or jack nut as they are often called, is a fastener used to not only affix one component to another, but to also limit vibration. Made of several types of rubber to suit a variety of uses, the well nut has a wide flange at the top of a barrel-like body with a nut, commonly made of brass, molded into the bottom.

They may be used to prevent tearing or abrasion of the pierced material or protection from abrasion of the insulation on the wire, cable, line being routed through the penetration, and to cover sharp edges of the piercing, or all of the above. They not only protect the surface of holes but also whatever it is that goes through them, simultaneously providing seal-like properties to prevent ingress. It is widely used in various fields such as electronics, electrical appliances, machinery, sports equipment, furniture, and lighting.

FEATURES AND BENEFITS

  • Easy one-step installation
  • Dampens vibration and shock
  • Water resistance
  • Self Sealing properties thus keeping out ambient moisture and gases.
  • Acts as insulator and prevents galvanic corrosion.
  • Easily replaceable.
  • Marine grade
  • Helps to isolate electrical conductivity
  • Rubber well nuts with threaded brass insert
  • No special tools required
  • Comprise of a flanged rubber sleeve with captive brass nut.
  • Sizes given are thread diameter x fixing length.
  • Offer excellent electrical isolation & vibration resistance.
  • Simply place the fixing in the hole, insert a bolt and tighten to expand the sleeve.
  • Ideal for fixing to cavity walls & hollow blocks.
  • The grip range is the thickness of material the nuts will tighten into, thinnest to thickest
  • Can be used with any type of bolt.

APPLICATION PROCESS

The well nut is placed into a pre-drilled hole until the flange is flush with the surface of the hole. A bolt is threaded into the well nut and tightens the embedded nut, causing the body to swell and fill the hole to create a seal. The tightened well nut has now created a watertight seal in the hole that will cushion the attached component due to the rubber body of the nut.
When used in a vibration dampening mode, the well nut is typically mounted onto a leg or mounting bracket of a machine and placed into a blind hole. The mounting bolts are then tightened, causing the rubber body of the jack nut to expand and effectively fill the hole and tighten the nut in place. The mounting bolt inside of the rubber nut is allowed to move within the rubber, thus dampening any vibration.
This mounting style is often used with fragile instruments such as compasses and critical gauges and has even been used as engine mounts and motor mounts in all types of vehicles, from motorcycles to automobiles.

The attaching nut used inside of the well nut is commonly made of brass or stainless steel. This prevents rust and corrosion from occurring prematurely when used as a type of water plug. Often, plumbers will use a jack nut to stop the flow of water through a pipe. In this application, the well nut is inserted into the pipe, often while water is continuing to flow through the pipe; as the nut is tightened, the nut expands against the pipe walls and the water is effectively sealed within the pipe. The nut is easily removed in the event that the flow needs to be restored through the pipe.
Other uses for the well nut are to insulate electrical wiring as it passes through a steel firewall in a vehicle and to create a drain or outlet in a metal or plastic container. It is wise to check the compatibility of the rubber with the intended use of the nut and be sure that there are no issues. When used in a vibration dampening application, it is best to occasionally recheck the nut to assure it has not loosened over time.

DIMENSIONS

Part Number Thread Size Unified
(T)
Thread Size Metric
(T)
Head Diameter
(HD)
Total Length
(TL)
Shank Length
(SL)
Shank Diameter
(SD)
Head Thickness
(HT)
Hole Size
PANEL HOLD DIA
GRIP RANGE MIN-MAX
PANEL THICKNESS
INCHES MM INCHES MM INCHES MM INCHES MM INCHES MM INCHES MM INCHES MM
BWN 1 #6-32 UNC M3 X 0.5 0.452 11.4808 0.499 12.6746 0.437 11.0998 0.312 7.9248 0.062 1.5748 0.312 7.9248 0.015 – 0.156 0.381-3.9624
BWN 2 #6-32 UNC M3 X 0.5 0.554 14.0716 0.981 24.9174 0.946 24.0284 0.24 6.096 0.035 0.889 0.25 6.35 0.375 – 0.607 9.525-15.4178
BWN 3 #8-32 UNC M4 X 0.7 0.75 19.05 0.575 14.605 0.5 12.7 0.312 7.9248 0.062 1.5748 0.312 7.9248 0.015-0.172 0.381-4.3688
BWN 4 #8-32 UNC M4 X 0.7 0.438 11.1252 0.499 12.6746 0.447 11.3538 0.312 7.9248 0.052 1.3208 0.312 7.9248 0.015 – 0.156 0.381-3.9624
BWN 5 #10-32 UNF M5 X 0.8 0.5 12.7 0.554 14.0716 0.518 13.1572 0.377 9.5758 0.036 0.9144 0.377 9.5758 0.015 – 0.192 0.381-4.8768
BWN 6 #10-32 UNF M5 X 0.8 0.562 14.2748 0.665 16.891 0.625 15.875 0.377 9.5758 0.04 1.016 0.377 9.5758 0.035 – 0.232 0.889-5.8928
BWN 7 #10-32 UNF M5 X 0.8 0.75 19.05 0.703 17.8562 0.625 15.875 0.375 9.525 0.078 1.9812 0.377 9.5758 0.030 – 0.227 0.762-5.7658
BWN 8 1/4″-20 UNC M6 X 1.0 0.74 18.796 0.829 21.0566 0.642 16.3068 0.5 12.7 0.187 4.7498 0.5 12.7 0.031 – 0.187 0.7874-4.7498
BWN 9 1/4″-20 UNC M6 X 1.0 0.635 16.129 1.051 26.6954 1 25.4 0.5 12.7 0.051 1.2954 0.5 12.7 0.250 – 0.457 6.35-11.6078
BWN 10 5/16″-18 UNC M8 X 1.25 0.875 22.225 0.725 18.415 0.6 15.24 0.62 15.748 0.125 3.175 0.625 15.875 0.016 – 0.156 0.4064-3.9624
BWN 11 3/8″-16 UNC M10 X 1.5 1.25 31.75 1.062 26.9748 1 25.4 0.75 19.05 0.187 4.7498 0.75 19.05 0.015 – 0.437 0.381-11.0998