Harbor Freight drill motor & gearbox.

Harbor Freight 9.6 V Drill

These are the specs for the Harbor Freight Drill Master 9.6 V cordless drill models 45935 and 45936. The drill has a neutrally timed Mabuchi RS-550 HS motor and a 36:1 planetary gearbox and comes with a 9.6 V 1300 mAh battery pack. The entire drill including battery weighs 2.8 lb. Motor and gearbox with chuck removed weigh approximately 1 lb. The motor body is 57 mm in length and 37.5 mm in diameter.

Specifications for rotation in both directions:	Motor only performance.	Typical system performance.
Voltage:	9.6 V
Angular-velocity constant:	55.6 rpm/V
Torque constant:	24.3 ozf·in/A
Terminal resistance:	0.116 ohm
No-load current:	2.55 A
Peak efficiency:	68 %
Power source resistance:	0 ohm	0.116 ohm
Peak power:	0.25 hp	0.117 hp
No-load angular velocity:	517 rpm	501 rpm
Stall current:	82.8 A	41.4 A
Stall torque:	1950 ozf·in	944 ozf·in
Explanation of specifications.

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Page last modified 08/07/07.