"BOSS" BOLT CLAMP INSTALLATION

Boss Bolt Clamp Installation Instructions


The bolts used in the "Boss" interlocking clamps are not standard bolts. They vary from standard bolts in their length, diameter, overall thread length and material hardness. These bolts can be retorqued, but it is not recommended that they be reused, as they are designed for a single bend only. We recommend using only factory supplied replacement bolts. The torque values listed on the Boss Couplings and Clamps page are based on "dry bolts". The use of lubricant on the bolts will adversely affect clamp performance. Do not lubricate the nuts and bolts. The recommended torque rating is in Ft. Lbs., and the values shown for stainless steel clamps are also the values recommended for malleable iron clamps.


Bolt Tightening Sequence for "Boss" Clamps

Some Important Notes:

  • 1. The correct size "Boss" clamp must be used.
  • 2. Bolts used in "Boss" clamps are designed to bend as they are tightened. This allows the clamp to conform to the hose outside diameter.
  • 3. Always tighten bolts to their specified torque value. The torque values can be found on the Boss Couplings and Clamps page.
  • 4. Periodic re-tightening of the bolts is required due to "Cold Flow", a phenomenon present in all rubber hoses.
  • 5. "Boss" Clamps are for single use only! Once removed, they are to be discarded


2 Bolt Clamp Tightening Sequence:

Using a torque wrench, begin tightening the bolts as follows:

  • a) First bolt (nut facing assembler) 1 full turn.
  • b) Second bolt (opposite first bolt) 1 full turn.
  • c) Repeat procedure "a" and "b" until both bolts have reached the recommended torque.
  • d) Remove the assembly from the vise.


4 Bolt Clamp Tightening Sequence:

Using a torque wrench, begin tightening the bolts as follows:

  • a) Back bolt (bolt with nut facing the assembler that is furthest away from gripping finger) 1 full turn.
  • b) Front bolt (bolt with nut facing the assembler that is closest to gripping finger) 1 full turn.
  • c) Snug by hand (if bolts are loose) nuts on the opposite side of bolts just torqued.
  • d) Opposite side back bolt (bolt with nut facing assembler furthest away from gripping finger) 1 full turn.
  • e) Opposite side front bolt (bolt with nut facing assembler closest to gripping finger) 1 full turn.
  • f) Snug by hand (if bolts are loose) nuts on the opposite side of bolts just torqued.
  • g) Repeat procedure "a" and "f" until all of the bolts have reached the recommended torque.
  • h) Remove the assembly from the vise.


6 Bolt Clamp Tightening Sequence:

Using a torque wrench, begin tightening the bolts as follows:

  • a) Back bolt (bolt with nut facing the assembler that is furthest away from gripping finger) having an "X" near it one full turn.
  • b) Front bolt (bolt with nut facing the assembler that is closest to gripping finger) of the same segment one full turn.
  • c) Moving to the clamp segment to the left of the one just tightened, snug bolts by hand (if bolts are loose).
  • d) Back bolt to one full turn.
  • e) Front bolt one full turn.
  • f) Moving to the clamp segment to the left of the one just tightened, snug bolts by hand (if bolts are loose).
  • g) Back bolt one full turn.
  • h) Front bolt one full turn.
  • i) Repeat procedure "a" and "h" until all of the bolts have reached the recommended torque.
  • h) Remove the assembly from the vise.

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