20V Brushless 7/16" High Torque Impact Wrench
Model
HCB810B
WARNING: To prevent serious injury, User must read and
understand Owner’s Manual. SAVE THIS MANUAL.
When unpacking, make sure that the product is intact and undamaged.
If any parts are missing or broken, please call 1‑800‑444‑3353
as soon as possible. Reference 70239.
®
Owner’s Manual &
Safety Instructions
REV 25b
Page 2 For technical questions, please call 1-800-444-3353. Item 70239
IMPORTANT SAFETY INFORMATION
GENERAL POWER TOOL SAFETY WARNINGS
Read all safety warnings, instructions, illustrations and
specifications provided with this power tool. Failure to
follow all instructions listed below may result in electric
shock, fire and/or serious injury.
Save all warnings and instructions
for future reference.
The term ″power tool″ in the warnings refers
to your mains-operated (corded) power tool or
battery-operated (cordless) power tool.
Work Area Safety
1. Keep work area clean and well lit.
Cluttered or dark areas invite accidents.
2. Do not operate power tools in explosive
atmospheres, such as in the presence of
flammable liquids, gases or dust. Power tools
create sparks which may ignite the dust or fumes.
3. Keep children and bystanders
away while operating a power tool.
Distractions can cause you to lose control.
Electrical Safety
1. Do not expose power tools to rain or wet
conditions. Water entering a power tool
will increase the risk of electric shock.
2. Hold power tools by insulated gripping
surfaces, when performing an operation
where the fastener may contact hidden wiring.
Fasteners contacting a ″live″ wire will make
exposed metal parts of the power tool ″live″ and
could give the operator an electric shock.
Personal Safety
1. Stay alert, watch what you are doing and use
common sense when operating a power tool.
Do not use a power tool while you are tired
or under the influence of drugs, alcohol or
medication. A moment of inattention while operating
power tools may result in serious personal injury.
2. Use personal protective equipment. Always wear
eye protection. Protective equipment such
as dust mask, non-skid safety shoes, hard hat,
or hearing protection used for appropriate
conditions will reduce personal injuries.
3. Prevent unintentional starting. Ensure the Trigger
is in the off-position before connecting to
power source, picking up or carrying the tool.
Carrying power tools with your finger on
the Trigger or energizing power tools that
have the Trigger on invites accidents.
4. Remove any adjusting key or wrench before
turning the power tool on. A wrench or
a key left attached to a rotating part of the
power tool may result in personal injury.
5. Do not overreach. Keep proper footing and
balance at all times. This enables better control
of the power tool in unexpected situations.
6. Dress properly. Do not wear loose clothing or
jewelry. Keep your hair, clothing and gloves
away from moving parts. Loose clothes, jewelry
or long hair can be caught in moving parts.
7. If devices are provided for the connection of
dust extraction and collection facilities, ensure
these are connected and properly used. Use of
dust collection can reduce dust-related hazards.
8. Do not let familiarity gained from frequent use
of tools allow you to become complacent and
ignore tool safety principles. A careless action
can cause severe injury within a fraction of a second.
9. Only use safety equipment that has been approved
by an appropriate standards agency. Unapproved
safety equipment may not provide adequate
protection. Eye protection must be ANSI‑approved
and breathing protection must be NIOSH‑approved
for the specific hazards in the work area.
10. Do not lay the tool down until it has come to
a complete stop. Moving parts can grab the
surface and pull the tool out of your control.
11. When using a handheld power tool,
maintain a firm grip on the tool with both
hands to resist starting torque.
12. Do not leave the tool unattended when the
Battery Pack is connected. Turn off the tool,
and remove the Battery Pack before leaving.
13. This product is not a toy. Keep it
out of reach of children.
14. People with pacemakers should consult their
physician(s) before use. Electromagnetic fields in
close proximity to heart pacemaker could cause
pacemaker interference or pacemaker failure.
15. The warnings, precautions, and instructions
discussed in this instruction manual cannot
cover all possible conditions and situations
that may occur. It must be understood by the
operator that common sense and caution are
factors which cannot be built into this product,
but must be supplied by the operator.
Page 3For technical questions, please call 1-800-444-3353.Item 70239
Power Tool Use and Care
1. Do not force the power tool. Use the
correct power tool for your application.
The correct power tool will do the job better and
safer at the rate for which it was designed.
2. Do not use the power tool if the Trigger
does not turn it on and off. Any power tool
that cannot be controlled with the Trigger
is dangerous and must be repaired.
3. Disconnect the plug from the power source and/
or remove the battery pack, if detachable, from
the power tool before making any adjustments,
changing accessories, or storing power
tools. Such preventive safety measures reduce
the risk of starting the power tool accidentally.
4. Store idle power tools out of the reach of
children and do not allow persons unfamiliar
with the power tool or these instructions
to operate the power tool. Power tools are
dangerous in the hands of untrained users.
5. Maintain power tools and accessories.
Check for misalignment or binding of moving
parts, breakage of parts and any other
condition that may affect the power tool’s
operation. If damaged, have the power tool
repaired before use. Many accidents are
caused by poorly maintained power tools.
6. Keep cutting tools sharp and clean. Properly
maintained cutting tools with sharp cutting edges
are less likely to bind and are easier to control.
7. Use the power tool, accessories and tool bits
etc. in accordance with these instructions,
taking into account the working conditions
and the work to be performed. Use of the
power tool for operations different from those
intended could result in a hazardous situation.
8. Keep handles and grasping surfaces dry, clean
and free from oil and grease. Slippery handles
and grasping surfaces do not allow for safe handling
and control of the tool in unexpected situations.
Service
1. Have your power tool serviced by a
qualified repair person using only identical
replacement parts. This will ensure that the
safety of the power tool is maintained.
2. Never service damaged BATTERY packs. Service
of BATTERY packs should only be performed by
the manufacturer or authorized service providers.
3. Maintain labels and nameplates on
the tool. These carry important safety
information. If unreadable or missing, contact
Harbor Freight Tools for a replacement.
Battery Tool Use and Care
1. Prevent unintentional starting. Ensure the
switch is in the off-position before connecting
to battery pack, picking up or carrying the
power tool. Carrying the power tool with your
finger on the switch or energizing power tool
that have the switch on invites accidents.
2. Disconnect the battery pack from the power
tool before making any adjustments, changing
accessories, or storing power tool. Such
preventive safety measures reduce the risk
of starting the power tool accidentally.
3. Recharge only with the charger specified by
the manufacturer. A charger that is suitable
for one type of battery pack may create a risk
of fire when used with another battery pack.
4. Use power tools only with specifically
designated battery packs. Use of any other
battery packs may create a risk of injury and fire.
5. When battery pack is not in use, keep it away
from other metal objects, like paper clips,
coins, keys, nails, screws or other small metal
objects, that can make a connection from
one terminal to another. Shorting the battery
terminals together may cause burns or a fire.
6. Under abusive conditions, liquid may be ejected
from the battery; avoid contact. If contact
accidentally occurs, flush with water. If liquid contacts
eyes, additionally seek medical help. Liquid ejected
from the battery may cause irritation or burns.
7. Do not use a battery pack or power tool that
is damaged or modified. Damaged or modified
batteries may exhibit unpredictable behavior
resulting in fire, explosion or risk of injury.
8. Do not expose a battery pack or power tool to
fire or excessive temperature. Exposure to fire
or temperature above 140°F may cause explosion.
9. Follow all charging instructions and do
not charge the battery pack or power tool
outside of the temperature range specified
in the instructions. Charging improperly or at
temperatures outside of the specified range may
damage the battery and increase the risk of fire.
10. Have servicing performed by a qualified
repair person using only identical
replacement parts. This will ensure that
the safety of the product is maintained.
11. Do not modify or attempt to repair the power
tool or the battery pack except as indicated
in the instructions for use and care.
Page 4 For technical questions, please call 1-800-444-3353. Item 70239
12. The battery Charger gets hot during use.
The Charger’s heat can build up to
unsafe levels and create a fire hazard if it
does not receive adequate ventilation,
due to an electrical fault, or if it is used in a
hot environment. Do not place the Charger on a
flammable surface. Do not obstruct any vents on the
Charger. Especially avoid placing the Charger on
carpets and rugs; they are not only flammable,
but they also obstruct vents under the Charger.
Place the Charger on a stable, solid, nonflammable
surface (such as a stable metal workbench or
concrete floor) at least 1 foot away from all
flammable objects, such as drapes or walls. Keep a
fire extinguisher and a smoke detector in the area.
Frequently monitor the Charger and
Battery Pack while charging.
Lithium Battery Safety Warnings
LITHIUM BATTERIES STORE
A LARGE AMOUNT OF ENERGY AND
WILL VENT FIRE OR EXPLODE
IF MISTREATED:
1. Keep Battery Pack dry.
2. DO NOT DO ANY OF THE FOLLOWING
TO THE BATTERY PACK:
• Open,
• Drop,
• Short-circuit,
• Puncture,
• Incinerate, or
• Expose to temperatures greater than 140°F.
3. Charge Battery Pack only according
to its Charger’s instructions.
4. Inspect Battery Pack before every use;
do not use or charge if damaged.
Safety Instructions For
All Operations
1. Wear ear protectors when Impact drilling.
Exposure to noise can cause hearing loss.
2. Use the auxiliary handle(s). Loss of
control can cause personal injury.
3. Brace the tool properly before use. This tool
produces a high output torque and without
properly bracing the tool during operation, loss of
control may occur resulting in personal injury.
4. Hold the power tool by insulated gripping
surfaces, when performing an operation
where the cutting accessory or fasteners may
contact hidden wiring or its own cord. Cutting
accessory contacting a “live” wire may make
exposed metal parts of the power tool “live” and
could give the operator an electric shock.
5. Let bit cool before touching, changing
or adjusting it. Bits heat up dramatically
while in use, and can burn you.
6. If the drill bit jams, release the Trigger immediately;
drill torque can cause injury or break bit.
Safety Instructions When
Using Long Drill Bits
1. Never operate at higher speed than the maximum
speed rating of the drill bit. At higher speeds, the
bit is likely to bend if allowed to rotate freely without
contacting the workpiece, resulting in personal injury.
2. Always start drilling at low speed and with the bit tip
in contact with the workpiece. At higher speeds, the
bit is likely to bend if allowed to rotate freely without
contacting the workpiece, resulting in personal injury.
3. Apply pressure only in direct line with the
bit and do not apply excessive pressure.
Bits can bend causing breakage or loss of
control, resulting in personal injury.
Vibration Safety
Repeated or long‑term exposure to vibration may
cause temporary or permanent physical injury,
particularly to the hands, arms and shoulders.
To reduce the risk of vibration‑related injury:
1. Anyone using vibrating tools regularly or for an
extended period should first be examined by a
doctor and then have regular medical check‑ups to
ensure medical problems are not being caused or
worsened from use. Pregnant women or people who
have impaired blood circulation to the hand, past
hand injuries, nervous system disorders, diabetes,
or Raynaud’s Disease should not use this tool.
If you feel any symptoms related to vibration (such
as tingling, numbness, and white or blue fingers),
seek medical advice as soon as possible.
2. Do not smoke during use. Nicotine reduces
the blood supply to the hands and fingers,
increasing the risk of vibration‑related injury.
3. Wear suitable gloves to reduce the
vibration effects on the user.
4. Use tools with the lowest vibration
when there is a choice.
5. Include vibration‑free periods each day of work.
6. Grip tool as lightly as possible (while still keeping
safe control of it). Let the tool do the work.
Page 5For technical questions, please call 1-800-444-3353.Item 70239
7. To reduce vibration, maintain the tool as
explained in this manual. If any abnormal
vibration occurs, stop use immediately.
SAVE THESE
INSTRUCTIONS
GROUNDING
TO PREVENT ELECTRIC SHOCK AND
DEATH FROM INCORRECT GROUNDING:
Check with a qualified electrician if you
are in doubt as to whether the outlet is
properly grounded. Do not modify the power cord
plug provided with the charger. Do not use the
charger if the power cord or plug is damaged.
If damaged, have it repaired by a service facility
before use. If the plug will not fit the outlet,
have a proper outlet installed by a
qualified electrician.
Extension Cords
Note: Extension cords must not be
used with this item’s Charger.
Warning Symbols and Definitions
This is the safety alert symbol. It is used to
alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to
avoid possible injury or death.
Indicates a hazardous
situation which, if not
avoided, will result in death or serious injury.
Indicates a hazardous
situation which, if not
avoided, could result in death or serious injury.
Indicates a hazardous
situation which, if not
avoided, could result in minor or moderate injury.
Addresses practices not
related to personal injury.
Symbology
V
Volts
Direct Current
A
Amperes
n
0
xxxx/min.
No Load Revolutions per Minute (RPM)
WARNING marking concerning Risk
of Eye Injury. Wear ANSI‑approved
safety goggles with side shields.
Read the manual before
set‑up and/or use.
WARNING marking
concerning Risk of Fire.
Do not cover Charger
ventilation ducts.
Charge on fireproof surface only.
WARNING marking concerning Risk
of Electric Shock.
Properly connect Charger’s power
cord to appropriate outlet.
WARNING marking concerning
Risk of Explosion.
Do not puncture, short, or open
battery packs and do not charge
damaged battery packs.
SPECIFICATIONS
Battery Type Hercules 20V Li‑Ion
Charger Type Hercules 20V/12V Li‑Ion
No Load Speed n
0
: 0 -2100/min
Speed
0‑800 RPM
0‑1100 RPM
0‑1700 RPM
0‑2100 RPM
Impact Rate 0‑2400 BPM
Max Fastening Torque
550 ft‑lb (10 seconds)
700 ft‑lb (30 seconds)
Max Breakaway Torque 1200 ft‑lb
Chuck Size 7/16″
Page 6 For technical questions, please call 1-800-444-3353. Item 70239
Setup – Before Use
Read the ENTIRE IMPORTANT
SAFETY INFORMATION section at the
beginning of this manual including
all text under subheadings therein
before set up or use of this product.
Functions
1
2
3
4
5
6
7
8
1. Tool Hanger
2. Chuck
3. Direction Switch
4. Work Light
5. Trigger
6. Handle
7. Mode Indicator/Speed Selection Button
8. Belt Clip
Operating Instructions
Read the ENTIRE IMPORTANT
SAFETY INFORMATION section at the
beginning of this manual including
all text under subheadings therein
before set up or use of this product.
Tool Changing
TO PREVENT SERIOUS INJURY FROM
ACCIDENTAL OPERATION:
Make sure that the Trigger is locked and Battery
Pack is removed before performing any procedure
in this section.
Charging Battery Pack
Charge Battery after unpacking and before
using this tool. Follow instructions included
with Battery Charger (sold separately).
Attaching Belt Clip
Attach Belt Clip to either side of the
tool using supplied Screw.
Screw
Belt Clip
Page 7For technical questions, please call 1-800-444-3353.Item 70239
Bit Installation
CAUTION! TO PREVENT INJURY: Only use 7/16"
hex accessories designed for impact use. Verify
accessory fits the Chuck precisely before use.
CAUTION! TO PREVENT INJURY: Wear heavy‑duty
work gloves to provide protection when inserting and
removing drill bits. Drill bits become very hot during
use. Do not remove drill bits until the bit has cooled.
1. For Drilling/Driving: Pull Collar forward and
insert a quick change hex shank impact‑rated bit
(sold separately) into the Chuck. Release Collar.
2. For Fastening/Removing Nuts and Bolts: Pull
Collar forward and insert an impact‑rated square
drive socket adapter (sold separately) into the
Chuck. Release Collar and install appropriate
impact‑rated socket (sold separately).
3. To remove accessory, pull Collar forward
and remove from Chuck. Release Collar.
NOTICE: Use sharp bits. Dull, bent, or damaged
bits will cause stress on the tool and/or break.
Chuck
Direction Switch
Forward: Push Switch in on right side
(arrow pointing forward) for clockwise rotation.
Reverse: Push Switch in on left
side (arrow pointing backward) for
counterclockwise rotation.
Trigger Lock: Push Switch to the
center to lock the Trigger.
CAUTION! TO PREVENT INJURY: Set Direction
Switch to center Trigger Lock position during set
up, when changing bits or when tool is idle.
Push
for
Forward
Push
for
Reverse
Push to Center to
LOCK TRIGGER
Workpiece and Work Area Set Up
1. Designate a work area that is clean and well lit.
The work area must not allow access by children
or pets to prevent distraction and injury.
2. Secure loose workpieces using a vise or clamps
(not included) to prevent movement while working.
3. There must not be objects, such as utility lines,
nearby that will present a hazard while working.
General Instructions for Use
1. Lock Trigger, then insert a fully charged Battery Pack,
making sure that it clicks into place securely.
2. Install bit and set Direction Switch.
CAUTION! TO PREVENT INJURY: Most
drill bits are designed for use in the forward,
clockwise direction. Do not use a drill bit in the
opposite direction than it is designed for.
NOTICE: Do not change direction of rotation
while Chuck is rotating. Wait until Chuck has come
to a complete stop before changing direction.
3. Set Speed using Speed Selection Button.
4. Press Trigger to start the tool. The Work
Light will turn on when Trigger is pressed
and turn off when Trigger is released.
5. The tool has variable speed. To increase
speed, apply more pressure to Trigger. To
decrease speed, lessen pressure on Trigger.
Note: The amount of actual torque will vary depending
on the cleanness and condition of the threads and
other factors. If tightening critical components,
chase threads before assembling components and
check the actual torque applied to the fastener with
a mechanical torque wrench (not included).
6. When finished using the tool, release Trigger
and center Direction Switch to lock Trigger.
7. To prevent accidents, turn off the tool and
remove its Battery Pack after use. Clean, then
store the tool indoors out of children’s reach.
Page 8 For technical questions, please call 1-800-444-3353. Item 70239
Maintenance and Servicing
Instructions
Procedures not specifically explained
in this manual must be performed
only by a qualified technician.
TO PREVENT SERIOUS INJURY FROM
ACCIDENTAL OPERATION:
Make sure that the Trigger is locked and Battery
Pack is removed before performing any procedure
in this section.
TO PREVENT SERIOUS INJURY FROM TOOL
FAILURE:
Do not use damaged equipment.
If abnormal noise or vibration occurs, have
the problem corrected before further use.
Cleaning, Maintenance,
and Lubrication
1. BEFORE EACH USE, inspect the general
condition of the tool. Check for:
• leaking, swollen, or cracked battery pack,
• loose hardware,
• misalignment or binding of moving parts,
• cracked or broken parts,
• any other condition that may
affect its safe operation.
2. AFTER USE, wipe external surfaces
of the tool with clean cloth.
3. LI‑ION BATTERY MUST BE RECYCLED OR
DISPOSED OF PROPERLY.
Do not short, incinerate or open battery.
4. Disconnect battery pack and store battery pack,
charger, and tool in dry, indoor area out of
reach of children and away from metal objects
(i.e., paperclips, coins) to prevent shorting.
Page 9For technical questions, please call 1-800-444-3353.Item 70239
Troubleshooting
Problem Possible Causes Likely Solutions
Tool will not start. 1. Battery Pack not properly
connected.
2. Battery Pack not properly
charged.
3. Battery Pack stopped
working.
4. Internal damage or wear.
(Trigger, for example.)
1. Remove Battery Pack, make sure there are
no obstructions, clean battery contacts on
tool, reinsert the Battery Pack according to its
shape (it should only fit one way), and press
firmly until the Battery Pack locks in place.
2. Make sure Charger is connected and
operating properly. Give enough time for
Battery Pack to recharge properly.
3. Dispose of old Battery Pack properly or recycle.
Replace Battery Pack.
4. Have technician service tool.
Tool operates slowly. 1. Forcing tool to work too fast.
2. Battery Pack wearing out.
1. Allow tool to work at its own rate.
2. Dispose of old Battery Pack properly or recycle.
Replace Battery Pack.
Excessive
noise/rattling.
Internal damage or wear. Have technician service tool.
Overheating. 1. Forcing tool to work too fast.
2. Blocked motor housing vents.
1. Allow tool to work at its own rate.
2. Wear ANSI‑approved safety goggles and
NIOSH‑approved dust mask/respirator while
blowing dust out of motor using compressed air.
Follow all safety precautions whenever diagnosing or servicing the tool.
Disconnect Battery Pack and Charger power supply before service.
Page 10 For technical questions, please call 1-800-444-3353. Item 70239
®
Page 11For technical questions, please call 1-800-444-3353.Item 70239
Record Product’s Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Replacement parts may be available for this item.
Visit harborfreight.com/parts for a list of in stock parts. Reference UPC 193175493835.
®
26677 Agoura Road • Calabasas, CA 91302 • 1-800-444-3353
Visit our website at: https://www.harborfreight.com
Email our technical support at: [email protected]
For technical questions, please call 1-800-444-3353
Copyright
©
2025 by Harbor Freight Tools
®
. All rights reserved. No portion of this manual or
any artwork contained herein may be reproduced in any shape or form without the express
written consent of Harbor Freight Tools. Diagrams within this manual may not be drawn
proportionally. Due to continuing improvements, actual product may differ slightly from the
product described herein. Tools required for assembly and service may not be included.
5-YEAR LIMITED WARRANTY
This Hercules tool is warranted to the original purchaser to be free from defects in materials and
workmanship for a period of five (5) years beginning on the date of purchase. This warranty does not
cover battery packs and battery chargers, which are covered under separate warranties. To obtain
warranty service, visit your local Harbor Freight retail store. Warranty registration is not required. The
product or part must be returned to us with proof of purchase (e.g. in‑store receipt or packing slip/invoice)
and may require shipment by purchaser to a service center at purchaser’s expense. If our inspection
verifies a covered defect in materials or workmanship during the warranty period, we will, at our option,
repair or replace the defective product. We will return repaired products within a reasonable time at our
expense, but if we determine that there is no defect, or that the defect resulted from causes not within
the scope of our warranty, then we will return the product to you if you pay return shipping costs.
This warranty does not cover any failure or damage that we determine is due directly or indirectly
to normal wear and tear, misuse, use not for the intended purpose or not in accordance with the
product manual, abuse, accident, rental, modification or alteration, unauthorized repair, improper
installation, neglect, lack of maintenance, or any other failure not arising from defective materials or
workmanship. Fraudulent returns or claims will be denied. The repair or replacement described in this
warranty shall be your sole and exclusive remedy. THIS WARRANTY IS EXCLUSIVE AND IN LIEU
OF ALL OTHER EXPRESS WARRANTIES, WRITTEN OR ORAL, AND ANY IMPLIED WARRANTIES
ARE DISCLAIMED TO THE EXTENT PERMITTED BY LAW AND OTHERWISE LIMITED TO THE
DURATION OF THE EXPRESS WARRANTY HEREIN. HARBOR FREIGHT SHALL NOT BE LIABLE
UNDER ANY CIRCUMSTANCES FOR ANY INCIDENTAL, INDIRECT, SPECIAL, CONSEQUENTIAL,
OR PUNITIVE DAMAGES OR COSTS ARISING FROM THIS WARRANTY OR THE USE OF THIS
PRODUCT. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY
LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO
THESE LIMITATIONS MAY NOT APPLY TO YOU. THIS WARRANTY GIVES YOU SPECIFIC LEGAL
RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE.
