5/16" BoxBolt®

5/16" BoxBolt®

Item #CONF-BQ-516

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BoxBolt is a blind bolt that works like an expansion anchor for steel. It works with all types of hollow sections as well as other steelwork where access to the backside is limited. The BoxBolt can be tightened down form onside. The hexagonal shoulder lets the bolt to be held in position. The core bolt is tightened which draws the cone into the body which expands to form a secure connection. The BoxBolt comes in three grip lengths and three finishes.

  • box bolt connection
  • box bolt fastener diagram
Box Bolt SizeDim ADim BDim C
1/4 1-3/16 7/16 7/16"
5/16 1-3/8 1/2 9/16"
3/8 1-9/16 9/16 3/4
1/2 2 13/16 13/16
5/8 2-3/16 13/16 1-1/16
3/4 2-3/4 1 1-5/16"

Minimum edge distance = Dim B + the thickness of hollow section

Product CodeDescriptionCore Bolt LengthClamping Range (X)Across Flats of ShoulderShoulder ThicknessSleeve DiameterHole Size DiameterAllowable LoadTorque
      Min Max         Tensile (lbs.) Shear (lbs.)  
BQ1Z08 5/16" BoxBolt Size #1 Zinc Plated 2" 3/16" 1" 7/8" 1/4" 1/2" 9/16" 5,071 5,917 18
BQ2Z08 5/16" BoxBolt Size #2 Zinc Plated 2-3/4" 11/16" 1-13/16" 7/8" 1/4" 1/2" 9/16" 5,071 5,917 18
BQ3Z08 5/16" BoxBolt Size #3 Zinc Plated 3-9/16" 1-3/16" 2-5/8" 7/8" 1/4" 1/2" 9/16" 5,071 5,917 18
BQ1G08 5/16" BoxBolt Size #1 Hot Dip Galv 2" 3/16" 1" 7/8" 1/4" 1/2" 9/16" 5,071 5,917 18
BQ2G08 5/16" BoxBolt Size #2 Hot Dip Galv 2-3/4" 11/16" 1-13/16" 7/8" 1/4" 1/2" 9/16" 5,071 5,917 18
BQ3G08 5/16" BoxBolt Size #3 Hot Dip Galv 3-9/16" 1-3/16" 2-5/8" 7/8" 1/4" 1/2" 9/16" 5,071 5,917 18
BQ1S08 5/16" Box Bolt Size #1 Stainless Steel 2" 3/16" 1" 7/8" 1/4" 1/2" 9/16" 5,071 5,917 18
BQ2S08 5/16" Box Bolt Size #2 Stainless Steel 2-3/4" 11/16" 1-13/16" 7/8" 1/4" 1/2" 9/16" 5,071 5,917 18
BQ3S08 5/16" Box Bolt Size #3 Stainless Steel 3-9/16" 1-3/16" 2-5/8" 7/8" 1/4" 1/2" 9/16" 5,071 5,917 18
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