User Manual
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400 & 500 SERIES TOOL SPECIFICATIONS
TOOL AIR FITTING:
This tool uses a free-flow connector plug, 1/4” N.P.T. The minimum inside diameter should be .200” (5mm).
The fitting must be capable of discharging tool air pressure when disconnected from the air supply.
OPERATING PRESSURE:
The operating pressure of the 400 & 500 tools is 70 to 120 p.s.i. (4.9 to 8.4 kg/cm
2
). Select the operating
pressure within this range for best fastener performance. DO NOT EXCEED THIS RECOMMENDED
OPERATING PRESSURE.
AIR CONSUMPTION:
Series 400 requires 2.1 cubic feet per minute (59.5 liters per minute) of free air to operate at the rate of
100 fasteners per minute, at 80 p.s.i. (5.6kg/cm
2
).
Series 500 requires 2.6 cubic feet per minute. (73.6 liters per minute) of free air to operate at a rate of
100 fasteners per minute, at 80 p.s.i. (5.6 kg/cm
2
).
For Series 400 and 500 tools, take the actual rate at which the tool will be run to determine the amount
of air required.
For instance, if your fastener usage averages 50 fasteners per minute, you need 50% of the c.f.m. listed
above which is required to operate the tool at 100 fasteners per minute.
OPERATION
MODEL LENGTH HEIGHT WIDTH WEIGHT
438S4 13.98" (355mm) 8.84" (225 mm) 2.50" (64 mm) 4.05 lb. 1.83 (kg)
438S5 13.98" (355mm) 8.84" (225 mm) 2.50" (64 mm) 3.95 lb. 1.79 (kg)
438S2 13.98" (355mm) 8.84" (225 mm) 2.50" (64 mm) 4.55 lb. 2.06 (kg)
438S2R 13.98" (355mm) 8.84" (225 mm) 2.50" (64 mm) 4.70 lb. 2.13 (kg)
450S2 13.98" (355mm) 8.84" (225 mm) 2.50" (64 mm) 4.60 lb. 2.08 (kg)
538S4 13.98" (355mm) 8.84" (225 mm) 2.86" (73 mm) 4.15 lb. 1.88 (kg)
538S5 13.98" (355mm) 8.84" (225 mm) 2.86" (73 mm) 4.05 lb. 1.83 (kg)
MODEL STAPLE SERIES CROWN WIDTH WIRE SIZE MAXIMUM LEG LENGTH
438S4 16S4 1/2" (12.7mm) .061"x.056" (1.55 mm x 1.42 mm) 1.5" (38 mm)
438S5 17S5 7/16" (11.1mm) .057"x.051" (1.45 mm x 1.30 mm) 1.5" (38 mm)
438S2 16S2 1" (25.4 mm) .062" (1.57 mm) 1.5" (38 mm)
438S2R 16S2 1" (25.4 mm) .062" (1.57 mm) 1.5" (38 mm)
450S2 16S2 1" (25.4 mm) .062" (1.57 mm) 2" (50 mm)
538S4 16S4 1/2" (12.7 mm) .061"x.056" (1.55 mm x 1.42mm) 1.5" (38 mm)
538S5 16S5 7/16" (11.1 mm) .057"x.051" (1.45 mm x 1.30 mm) 1.5" (38 mm)
STANLEY-BOSTITCH OFFERS THREE TYPES OF OPERATION FOR THIS SERIES TOOL.
CONTACT TRIP
The common operating procedure on “Contact Trip” tools is for the operator to contact the work to actuate
the trip mechanism while keeping the trigger pulled, thus driving a fastener each time the work is contacted.
This will allow rapid fastener placement on many jobs, such as sheathing, decking and pallet assembly.
All pneumatic tools are subject to recoil when driving fasteners. The tool may bounce, releasing the trip,
and if unintentionally allowed to recontact the work surface with the trigger still actuated (finger still holding
trigger pulled) an unwanted second fastener will be driven.
SEQUENTIAL TRIP
The Sequential Trip requires the operator to hold the tool against the work before pulling the trigger. This
makes accurate fastener placement easier, for instance on framing, toe nailing and crating applications. The
Sequential Trip allows exact fastener location without the possibility of driving a second fastener on recoil, as
described under “Contact Trip”. The Sequential Trip Tool has a positive safety advantage because it will not
accidentally drive a fastener if the tool is contacted against the work – or anything else – while the operator
is holding the trigger pulled.
TRIGGER OPERATED
The Trigger Operated model is cycled by actuation of the trigger only. This model does not have a
Contact Arm and is intended for use only where a Contact Arm CANNOT be used to satisfy the
requirements of the application. The Trigger Operated tool will cycle each time the trigger is actuated.
MODEL IDENTIFICATION:
Refer to Operation Instructions on page 7 before proceeding to use this tool.
CONTACT TRIP SEQUENTIAL TRIP TRIGGER OPERATED
Identified by: Identified by: Identified by:
BLACK TRIGGER GRAY TRIGGER BLACK TRIGGER
All screws and nuts are metric.
FASTENER SPECIFICATIONS: