Bostitch N12B Series User manual

■ .
OPERATION and MAINTENANCE MANUAL
STANLEY
BOSTITCH
Model
N12B
Series
COIL-FED PNEUMATIC NAILERS
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A WARNING:
BEFORE OPERATING THIS TOOL, ALL OPERATORS SHOULD STUDY THIS MANUAL, TO UNDERSTAND AND FOLLOW
THE SAFETY WARNINGS AND INSTRUCTIONS. KEEP THESE INSTRUCTIONS WITH THE TOOL FOR FUTURE
REFERENCE. IF YOU HAVE ANY QUESTIONS, CONTACT YOUR STANLEY-BOSTITCH REPRESENTATIVE OR
DISTRIBUTOR.
BSA1474S REV T 1/93
6Z3HD BOSTITCH
Stanley Fastening Systems

INTRODUCTION
The Stanley-Bostitch N 1 2 series nailers are precision built-tools, designed for high speed, high volume nailing. These
coil-fed nailers will deliver efficient, dependable service when used correctly and with care. As with any fine power tool,
for best performance the manufacturer’s instructions must be followed. Please study this manual before operating the
nailer and understand the safety warnings and cautions. The instructions on installation, operation and maintenance should
be read carefully and the manual kept for reference. NOTE: Additional safety measures may be required because of your
particular application. Contact your Stanley-Bostitch representative or distributor with any questions concerning the nailer
and its use.
INDEX
Safety Instructions.3
Tool Specifications.4
Air Supply.5
Fittings
Hoses
Filters
Air Consumption
Regulators
Operating Pressure
Setting Correct Pressure
Lubrication .5
Loading the Tool.6
Shingle Gauge Adjustment.6
Operating the Tool.7,8
Basic Tool Operation.9
Maintaining the Tool.9
Trouble Shooting.10
Cleaning the Roofing Nailer.11
Exploded View / Parts List - Body.12
Exploded View / Parts List - Magazine.13
Tool Maintenance / Service Record.14
Accessories.15
Limited Warranty.Back Cover
NOTE: Stanley-Bostitch tools have been engineered to provide excellent customer satisfaction and are designed to achieve
maximum performance when used with precision Stanley-Bostitch fasteners engineered to the same exacting standards.
Stanley-Bostitch cannot assume responsibility for product performance if our tools are used with fasteners or
accessories not meeting the specific requirments established for genuine Stanley-Bostitch nails, staples, and
accessories.
PROTECT YOUR TOOLS
USEONJY GENUINE
6Q2B9.B0STITCH
FASTENERS
. V
- 2 -

SAFETY INSTRUCTIONS
AWARNING:
CAUTION:
Q
AWARNING:
AWARNING:
AWARNING:
AWARNING:
AWARNING:
AWARNING:
AWARNING:
AWARNING:
AWARNING:
AWARNING:
AWARNING:
AWARNING:
EYE PROTECTION which conforms to ANSI specifications and provides protection against flying
particles both from the FRONT and SIDE should ALWAYS be worn by the operator and others in the work
area when loading, operating or servicing this tool. Eye protection is required to guard against flying
fasteners and debris, which could cause severe eye injury.
The employer and/or user must ensure that proper eye protection is worn. Eye protection equipment
must conform to the requirements of the American National Standards Institute, ANSI Z87.1-1979 and
provide both frontal and side protection. NOTE: Non-side shielded spectacles and face shields alone do
not provide adequate protection.
EAR PROTECTION may be required in some environments. As the working area may include exposure
to high noise levels which can lead to hearing damage, the employer and user should ensure that any
necessary hearing protection is provided and used by the operator and others in the work area.
AIR SUPPLY AND CONNECTIONS
Do not use oxygen, combustible gases, or bottled gases as a power source for this tool as tool may
explode, possibly causing injury.
Do not use supply sources which can potentially exceed 200 P.S.I.G. as tool may burst, possibly causing
injury.
The connector on the tool must not hold pressure when air supply is disconnected. If a wrong fitting
is used, the tool can remain charged with air after disconnecting and thus will be able to drive a fastener
even after the air line is disconnected, possibly causing injury.
Do not pull the trigger or depress the contact trip while connecting the tool to the air supply as the tool
may cycle, possibly causing injury.
Always disconnect air supply: 1.) Before making adjustments; 2.) When servicing the tool; 3.) When clearing
a jam; 4.) When tool is not in use; 5.) When moving to a different work area, as accidental actuation may
occur, possibly causing injury.
LOADING TOOL
When loading tool: 1.) Never place a hand or any part of body in fastener discharge area of tool; 2.) Never
point tool at anyone; 3.) Do not pull the trigger or depress the trip as accidental actuation may occur,
possibly causing injury.
OPERATION
Always handle the tool with care: 1.) Never engage in horseplay; 2.) Never pull the trigger unless nose
is directed toward the work; 3.) Keep other persons a safe distance from the tool while tool is in opera¬
tion as accidental actuation may occur, possibly causing injury.
The operator must not hold the trigger pulled on contact trip tools except during fastening operation
as serious injury could result if the trip accidentally contacted someone or something, causing the tool
to cycle.
Keep hands and body away from the discharge area of the tool. A contact trip tool may bounce from
the recoil of driving a fastener and an unwanted second fastener may be driven, possibly causing injury.
Check operation of the contact trip mechanism frequently. Do not use the tool if the trip is not working
correctly as accidental driving of a fastener may result. Do not interfere with the proper operation of
the contact trip mechanism.
Do not drive fasteners on top of other fasteners as this may cause deflection of fasteners which could
cause injury.
MAINTAINING THE TOOL
When working on air tools note the warnings in this manual and use extra care when evaluating problem
tools.
- 3 -

N12B FEATURES
• Choice of contact or sequential trip operation.
• The magazine accomodates 7/8’’-1-3/4” nails with a
simple twist.
• Fast, easy reloading—120 nails in each coil.
• Adjustable gauge for quick, accurate shingle
placement.
• Wide contact trip with carbide inserts resist
granule abrasion.
• Operates over a wide range of air pressures 70-100
P.S.I.G.
• Light alloy frame for ease of handling and good
balance.
• Nail magazine and driving channel open completely
for fast, easy reloading or cleaning of toot.
TOOL SPECIFICATIONS
All screws and nuts are metric.
TOOL AIR FITTING:
This tool uses a 1/4 N.P.T. male plug. The inside diameter should be .200” (5mm) or larger. The fitting must be capable
of discharging tool air pressure when disconnected from the air supply.
OPERATING PRESSURE:
70 to 100 p.s.i.g. (4.9 to 7.0 kg/cm 2 ). Select the operating pressure within this range for best fastener performance
DO NOT EXCEED THIS RECOMMENDED OPERATING PRESSURE.
AIR CONSUMPTION:
Model N12B require 3.8 cubic feet per minute (c.f.m.) of free air to operate at the rate of 100 nails per minute, at 80
p.s.i.g. Take the actual rate at which the tool will be run to determine the amount of air required. For instance, if your
nail usage average is 50 nails per minute, you need 50% of the 3.8 c.f.m. which is required for running at 100 nails
per minute.
STANLEY-BOSTITCH OFFERS TWO TYPES OF OPERATION FOR THIS SERIES TOOL
CONTACT TRIP SEQUENTIAL TRIP
The common operating procedure on “Contact Trip” tools The Sequential Trip requires the operator to hold the tool
is for the operator to contact the work to actuate the trip against the work before pulling the trigger. This makes
mechanism while keeping the trigger pulled, thus driving accurate fastener placement easier, for instance on fram-
a fastener each time the work is contacted. This will allow ing, toe nailing and crating applications,
rapid fastener placement on many jobs, such as sheathing. The Sequential Trip allows exact fastener location without
ec ing and pallet assembly. the possibility of driving a second fastener on recoil, as
All pneumatic tools are subject to recoil when driving described under “Contact Trip”,
fasteners. The tool may bounce, releasing the trip, and if The Sequential Trip Tool has a positive safety advantage
unintentionally allowed to recontact the work surface with because it will not accidentally drive a fastener if the tool
the trigger still actuated (finger still holding trigger pulled) is contacted against the work — or anything else — while
an unwanted second fastener will be driven. the operator is holding the trigger pulled.
MODEL
IDENTIFICATION:
Refer to Operation
Instructions on page
7 before proceeding
to use this tool.

AIR SUPPLY AND CONNECTIONS
AWARNING:
Do not use oxygen, combustible gases, or bottled gases as a power source for this tool as tool may
explode, possibly causing injury.
FITTINGS:
Install a male plug on the tool which is free flowing and which will release air pressure from the tool when disconnected
from the supply source.
HOSES:
Air hoses should have a minimum of 150 p.s.i. (10.5 kg/cm 2 ) working pressure rating or 150 percent of the maximum
pressure that could be produced in the air system, which ever is higher. The supply hose should contain a fitting that
will provide “quick disconnecting" from the male plug on the tool.
SUPPLY SOURCE:
Use only clean regulated compressed air as a power source for this tool. NEVER USE OXYGEN, COMBUSTIBLE GASES,
OR BOTTLED GASES, AS A POWER SOURCE FOR THIS TOOL AS TOOL MAY EXPLODE.
REGULATOR:
A pressure regulator with an operating pressure of 0 -125 p.s.i. is required to control the operating pressure for safe
operation of this tool. Do not connect this tool to air pressure which can potentially exceed 200 p.s.i. as tool may
fracture or burst, possibly causing injury.
OPERATING PRESSURE:
Do not exceed recommended maximum operating pressure as tool wear will be greatly increased. The air supply must
be capable of maintaining the operating pressure at the tool. Pressure drops in the air supply can reduce the tool’s
driving power. Refer to “TOOL SPECIFICATIONS” for setting the correct operating pressure for the tool.
FILTER:
Dirt and water in the air supply are major causes of wear in pneumatic tools. A filter will help to get the best
performance and minimum wear from the tool. The filter must have adequate flow capacity for the specific installation.
The filter has to be kept clean to be effective in providing clean compressed air to the tool. Consult the manufacturers
instructions on proper maintenance of your filter. A dirty and clogged filter will cause a pressure drop which will reduce
the tool’s performance.
LUBRICATION
Frequent, but not excessive, lubrication is required for best performance. Oil added thru the air line connection will lubricate
the internal parts. Use STANLEY-BOSTITCH Air Tool Lubricant, Mobil Velocite #10, or equivalent. Do not use detergent
oil or additives as these lubricants will cause excellerated wear to the seals and bumpers in the tool, resulting in poor
tool performance and frequent tool maintenance.
If no airline lubricator is used, add oil during use into the air fitting on the tool once or twice a day. Only a few drops
of oil at a time is necessary. Too much oil will only collect inside the tool and will be noticeable in the exhaust cycle.
COLD WEATHER OPERATION:
For cold weather operation, near and below freezing, the moisture in the air line may freeze and prevent tool operation.
We recommend the use of STANLEY-BOSTITCH WINTER FORMULA air tool lubricant or permanent antifreeze (ethylene
glycol) as a cold weather lubricant.
CAUTION: To prevent frost or ice formation on the tool’s operating valves and mechanisms that could cause tool failure,
do not store tools in a cold weather environment.
NOTE: Some commercial air line drying liquids are harmful to “0”-rings and seals — do not use these low temperature
air dryers without checking compatability.
- 5 -

LOADING THE N12 SERIES NAILER
EYE PROTECTION which conforms to ANSI specifications and provides protection against flying
particles both from the FRONT and SIDE should ALWAYS be worn by the operator and others in the work
area when loading, operating or servicing this tool. Eye protection is required to guard against flying fasteners
and debris, which could cause severe eye injury.
The employer and/or user must ensure that proper eye protection is worn. Eye protection equipment must
conform to the requirements of the American National Standards Institute, ANSI Z87.1-1979 and provide
both frontal and side protection. NOTE: Non-side shielded spectacles and face shields alone do not provide
adequate protection.
1) O pen the magazine.
Pull down door latch and swing door open.
Swing magazine cover open.
2 ) Check adjustment:
The nailer must be set for the length of nail to be used. Nails
will not feed smoothly if the magazine is not correctly adjusted.
The magazine contains an adjustable nail platform on which
the nail coil rests. The nail platform can be moved up and
down to three settings. To change setting pull up on the post
and twist to the correct step.
1-3/4” (45 mm) nails—use bottom step
1-1/4”, 1-1/2” (32, 38 mm)—use middle step
7/8”, 1 ” (22, 25 mm)—use top step
3) Load the coil of nails:
Place the coil of nails over the post in the magazine. Uncoil
enough nails to reach the feed pawl. Place the first nail in front
of the front tooth on the feed pawl, in the driver channel. The
nail heads must be in the slot in the nose.
NOTE: Use only nails recommended by Stanley-Bostitch N12
series nailers or nails which meet the Stanley-Bostitch
specifications.
4) Close the Door and the Magazine Cover:
Swing the door and the magazine cover closed. Check that the
latch pin engages when released and that the magazine cover
is behind the latch. The door and magazine cover may be
closed in any sequence.
SHINGLE GAUGE
This gauge can be used to control shingle spacing. Loosen two
screws to adjust gauge to desired shingle exposure, as shown.
WARNING: Disconnect air supply before making adjustments.
- 6 -

TOOL OPERATION
EYE PROTECTION which conforms to ANSI specifications and provides protection against flying
particles both from the FRONT and SIDE should ALWAYS be worn by the operator and others in the work
area when loading, operating or servicing this tool. Eye protection is required to guard against flying
fasteners and debris, which could cause severe eye injury.
The employer and/or user must ensure that proper eye protection is worn. Eye protection equipment
must conform to the requirements of the American National Standards Institute, ANSI Z87.1 — 1979 and
provide both frontal and side protection. NOTE: Non-side shielded spectacles and face shields alone do
not provide adequate protection.
BEFORE HANDLING OR OPERATING THIS TOOL:
I. READ AND UNDERSTAND THE WARNINGS CONTAINED IN THIS MANUAL.
II. REFER TO “TOOL SPECIFICATIONS” IN THIS MANUAL, TO IDENTIFY THE
OPERATING SYSTEM ON YOUR TOOL.
There are three available operating systems on STANLEY-BOSTITCH pneumatic tools. They are:
1. T RIGGER OPERATION 2. CONTACT TRIP OPERATION 3. SEQUENTIAL TRIP OPERATION
OPERATION
1. TRIGGER OPERATION:
A TRIGGER OPERATED tool requires a single action to drive a fastener. Each time the trigger is pulled the tool will
drive a fastener. The trigger operated model is intended for use only when a contact trip or sequential trip cannot be
used due to the requirements of the application.
2. CONTACT TRIP OPERATION:
THE CONTACT TRIP MODEL tool contains a work contacting arm that operates in conjunction with the trigger to drive
a fastener. There are two methods of operation to drive fasteners with a contact trip tool.
A. SINGLE FASTENER PLACEMENT: To operate the tool in this manner, position the nose of the tool on the work surface,
WITH FINGER OFF THE TRIGGER, and depress the contact trip. Pull the trigger to drive a fastener and remove
your finger from the trigger after each operation.
B. RAPID FASTENER OPERATION: To operate the tool in this manner, pull the trigger with the tool off the work surface.
To drive fasteners, “tap” the nose of the tool against the work surface using a “bouncing” motion. Each depres¬
sion of the contact trip will drive a fastener.
AWARNING:
The operator must not hold the trigger pulled on contact trip tools except during fastening operation, as serious
injury could result if the trip accidentally contacted someone or something, causing the tool to cycle.
AWARNING:
Keep hands and body away from the discharge area of the tool. A contact trip tool may bounce from the
recoil of driving a fastener and an unwanted second fastener may be driven, possibly causing injury.
OPERATOR NOTE:
Do not press the tool against the work surface with “extra force” but instead allow the tool to recoil off the work surface
to avoid a second unwanted fastener.
3. S EQUENTIAL TRIP OPERATION:
THE SEQUENTIAL TRIP MODEL contains a work contacting arm that operates in conjunction with the trigger to drive
a fastener. There is only one method of operation to drive fasteners with a sequential trip tool, and that is single fastener
placement. To operate the tool, release the trigger, press the nose of the tool on the work surface, then pull the trigger
to drive a fastener. This sequence must be performed for each fastener to be driven.
The Sequential Trip Model provides a positive safety advantage because it will not accidentally drive a fastener if the
nose of the tool is unintentionally allowed to recontact the work surface or anything else, with finger on the trigger.
- 7 -

TOOL OPERATION CHECK:
CAUTION: Remove all fasteners from tool before performing tool operation check.
1. TRIGGER OPERATED TOOL:
A. With finger off the trigger, hold the tool with a firm grip on the handle.
B. Place the nose of the tool against the work surface.
C. Pull the trigger to drive. Release the trigger and cycle is complete.
CAUTION: THE TOOL WILL CYCLE EACH TIME THE TRIGGER IS PULLED!
2. CONTACT TRIP OPERATION:
A. With finger off the trigger, press the contact trip against the work surface.
THE TOOL MUST NOT CYCLE.
B. Hold the tool off the work surface, and pull the trigger.
THE TOOL MUST NOT CYCLE.
C. With the tool off the work surface, pull the trigger. Press the contact trip against the work surface.
THE TOOL MUST CYCLE.
D. Without touching the trigger, press the contact trip against the work surface, then pull the trigger.
THE TOOL MUST CYCLE.
3. SEQUENTIAL TRIP OPERATION:
A. Press the contact trip against the work surface, without touching the trigger.
THE TOOL MUST NOT CYCLE.
B. Hold the tool off the work surface and pull the trigger.
THE TOOL MUST NOT CYCLE.
Release the trigger. The trigger must return to the trigger stop on the frame.
C. Pull the trigger and press the contact trip against the work surface.
THE TOOL MUST NOT CYCLE.
D. With finger off the trigger, press the contact trip against the work surface. Pull the trigger.
THE TOOL MUST CYCLE.
IN ADDITION TO THE OTHER WARNINGS CONTAINED IN THIS MANUAL
OBSERVE THE FOLLOWING FOR SAFE OPERATION
• Use the STANLEY-BOSTITCH pneumatic tool only for the purpose for which it was designed.
• Never use this tool in a manner that could cause a fastener to be directed toward the user or others in the work area.
• Do not use the tool as a hammer.
• Always carry the tool by the handle. Never carry the tool by the air hose.
• Do not alter or modify this tool from the original design or function without approval by STANLEY-BOSTITCH, INC.
• Always be aware that misuse and improper handling of this tool can cause injury to yourself and others.
• Never clamp or tape the trigger or contact trip in an actuated position.
• Never leave a tool unattended with the air hose attached.
• Do not operate this tool if it does not contain a legible WARNING LABEL.
NOTE: Do not continue to use a tool that leaks air or does not function properly. Notify your nearest Stanley-Bostitch representative
if your tool continues to experience functional problems.
- 8 -

BASIC TOOL OPERATION:
STANLEY-BOSTITCH pneumatic tools are cycled by a compressed air operated single piston design. The following il¬
lustrations show the four functional cycles that occur when the tool is operated to drive a fastener:
HEAD VALVE BUMPER
BASIC SINGLE PISTON STAPLER/NAfLER
RESERVOIR
OF HIGH
PRESSURE At
RETURN CHAMBER.
EXHAUST
SEALEO 0V
H£AO VALVE
BUMPER
HEAD VALVE OPEN
FIG. 2
DRIVING STROKE
| A END OF STROKE...
kJ Ul
/(_!
rz
TRIGGER STILL PULLED
EXHAUST OPEN \ «-j
T
s
fl
'wu/
AIR IN RETURN
CHAMBER PUSHES
PISTON UPWARO '
FIG. 4
RETURNING
\ TRIGGER VALVE
RELEASED -
AIR PRESSURE RETURNS
TO TOP OF HEAD VALVE
MAINTAINING THE PNEUMATIC TOOL
AWARNING:
When working on air tools, note the warnings in this manual and use extra care evaluating problem tools.
CAUTION : Pusher spring (constant force spring). Caution must be used when working with the spring assembly. The spring is wrapped
around, but not attached to, a roller. If the spring is extended beyond its length, the end will come off the roller and the spring will roll up
with a snap, with a chance of pinching your hand. Also the edges of the spring are very thin and could cut. Care must also be taken to insure
no permanent kinks are put in the spring as this will reduce the spring's force.
REPLACEMENT PARTS:
STAN-TECH replacement parts are recommended. Do not use modified parts or parts which will not give equivalent perfor¬
mance to the orignal equipment.
ASSEMBLY PROCEDURE FOR SEALS:
When repairing a tool, make sure the internal parts are clean and lubricated. Use Parker "0”-LUBE or equivalent on all “O”-
rings. Coat each '0”-ring with “0"-LUBE before assembling. Use a small amount of oil on all moving surfaces and pivots.
After reassembly add a few drops of approved Air Tool Lubricant through the air line fitting before testing.
AIR SUPPLY-PRESSURE AND VOLUME:
Air volume is as important as air pressure. The air volume supplied to the tool may be inadequate because of undersize fit¬
tings and hoses, or from the effects of dirt and water in the system. Restricted air flow will prevent the tool from receiving an
adequate volume of air, even though the pressure reading is high. The results will be slow operation, misfeeds or reduced
driving power. Before evaluating tool problems for these symptoms, trace the air supply from the tool to the supply source for
restrictive connectors, swivel fittings, low points containing water and anything else that would prevent full volume flow of air
to the tool.
- 9 -

PROBLEM
Trigger valve housing leans ar
Trigger valve stem leaks air
Frame/nose leaks air
Framefcap leaks t
Fasterers jam in tool
TROUBLE SHOOTING
CAUSE
O-nng cut or cracked
O-ring/seaJs cut or cracked
Loose nose screws
O-ring or Gasket is cut or cracked
Bumper crackedfwom
Cracked gasket
Crackedfworn head valve dumper
Loose cap screws
Air supply restriction
Tool dry, lack ol lubrication
Worn head valve O-rings
Broken cylinder cap spmg
Read valve stuck in cap
Tool dry, lacks lubrication
Broken cylinder cap spring
O-rings/'seals cut or cracked
Exhaust blocked
Trigger assembly wom/leaks
Dirt/tar build up on driver
Cylinder sleeve nol sealed correctly
on bottom bumper
Head valve dry
Air pressure too low
Worn bumper
Tar.'dirt in driver channel
Air restrictiohiinadequate air (low through
quick disconnect socket & plug
Worn piston O-ring
Tool dry, lacks lub-icalicn
Damaged pusher spring
Low av pressure
Loose magazine nose screws
Fasteners too short for tool
8ent fasteners
Wrong size fasteners
Leaking head cap gasket
Tngge- valve O-ring cuthvorn
Brokerdchipped driver
Dry/dirty magazine
Worn magazine
Driver channel worn
Wrong size fasteners
Bent fasteners
Loose magazine!nose screws
Brokenicfiipoed driver
CORRECTION
Replace O-rmg
Replace O-rinofseafs
Tighten and recheck
Replace O-ring or Gasket
Replace bumper
Replace gasket
Replace bumper
Tighten and recheck
Cneck air supply equipment
Use STANLEY-BOSTITCH Air Tool Lubricant
Replace O-rings
Replace cylinder cap spring
3 i sassem bl e/C heck/Lu dricate
Use STANLEY-BOSTITCH Air Tool Lubricant
Replace cap spring
Replace Onngsfseals
Check bumper, head valve spring
Replace nigger assembly
Disassemble noseidriver to dean
Disassemble to correct
Disassembtelubricate
Check air supply equipment
Replace bumper
Disassemble and clean nose
and driver
Replace quick disconnect
fittings
Replace O-ring. check driver
Use STANLEY-BOSTITCH Air Tool Lubricant
Replace spring
Check air supply system to tool
Tighten all screws
Use only recommended fasteners
Discontinue using these fasteners
Use only recommended fasteners
Tighten screws/repace gasket
Replace O-ring
Replace driver (check piston O-ringj
Cleanflubricale use STANLEY-BOSTITCH An
Tool Lubricant
Replace magazine
Replace nos a,‘check door
Use only recommended fasteners
Discontinue using these fasteners
Tighten all screws
Replace driver
COIL NAILERS
Skipping fasteners
Intermittent feed
Feed piston dry
Ado STANLEY-BOSTITCH Air Tool Lubricant
in hole hi feed piston cover
Feed piston O-rings cracked/worn
Replace O-rings/check bumper and spring.
Lubricate assembly.
Check Pawl binding
Inspect Pawl and spring on door. Must work
freely.
Canister bottom not set correctly
Set canister bottom lor length of nails oemg
used.
Broken weld wires in nail coil
Discontinue using
Fasteners jam in tool/canister
Wrong size fasteners for tool
Use only recommended fasteners,'check
canister bottom adjustment
Broken welded wires in nail coil
Discontinue using
Wrong slide plate ad/ustment lor wire/plastic
collated nail coil
Adjust switch pins lor wireiplastic collated
nail coil
- 10 -