Ever wonder what the different colored triggers on your Bostitch tools mean? Here is the low down from our friends at Bostitch a Division of Stanley Black & Decker.

Bostitch offers two types of triggers for pneumatic tools: Contact Trip (black trigger), Sequential Trip (silver-gray trigger) and Selectable Trigger. Each trigger has specific advantages. For example:

  • The Contact Trip is best suited for high-volume, rapid nailing or stapling where exact placement of the fastener is not important.
  • The Sequential Trip is best suited for applications where rapid nailing is not required or where the exact placement of the fastener is important.
  • You should evaluate your industrial fastening or construction project to determine which trigger type is best for you. Tools equipped with selectable trigger allow easy selection of contact or sequential trip with the turn of a dial.


  • A Bostitch tool with the Contact Trip (black trigger) installed will drive a nail whenever bot the trip and the trigger are depressed at the same time.
  • The tool can be used to rapidly drive nails by holding the trigger pulled and repeatedly bumping the trip against the work to be nailed. This is also known as Bump Firing or Bump Nailing. A nail is driven each time the trip is bumped against the work.
  • The Contact Trip will not prevent a nail from being accidentally driven if the trigger is held/pulled and the trip is bumped against any object or person. Never hold or carry the tool with your finger on the trigger unless driving fasteners into the work surface.
  • The Contact Trip can also be operated by holding the tool against the work with the trip depressed and then pulling the trigger (Place Nailing). When using a Contact Trip for Place Nailing, the tool may bounce due to recoil, and if the tool is allowed to contact the work surface while you are holding the trigger pulled, a second nail will be driven. The operator should allow the tool to recoil far enough to release the trip and avoid a second cycle. Don’t push the tool down extra hard; let the tool do the work.


  • The Sequential Trip (silver-gray trigger) offers a positive safety advantage since it will not accidentally drive a nail if the tool is bumped against any surface or anybody while the operator is holding the tool with the trigger pulled.
  • It also allows Place Nailing without the possibility of driving a second nail on recoil as described under “Contact Trip.”
  • The Sequential Trip gets its name from the “sequence” required to operate the tool. To drive a nail, the operator must first depress the trip against the work and then pull the trigger. To drive a second nail, the operator must lift the tool from the work, release the trigger, and then repeat the above sequence.

A couple of important reminders when operating pneumatic or cordless nailing and stapling tools…

  • You, and others working around you, can be seriously injured by fastener driving tools if you do not follow the instructions provided on the tool and in the operations manual. Used properly, these tools provide easy, safe, and efficient methods for driving nails and staples for all kinds of industrial fastening and construction projects.
  • Refer to your Operations Manual and or parts list
  • Eye protection which conforms to ANSI Z87.1 specifications and provided protection against flying particles both from the FRONT and SIDE should ALWAYS be worn by the operator and others in the work area when connecting to air supply, loading, operating, or servicing fastener driving tools. Eye protection is required to guard against flying fasteners and debris, which could cause severe eye injury.

A Trigger Tip: Bostitch designates trigger types in its tool nomenclature.

  • Dash 1 at the end of a tool part number means “CT” or Contact Trip
  • Dash 2 at the end of a tool part number means “ST” or Sequential Trip
  • Dash 3 at the end of a tool part number means “TO” or Trigger Operated


So if you are looking at a 15 degree Coil Siding Nailer model number N66C-1, this tool has a Contact Trip trigger.