Right Angle I.D. Clamping End Prep Tool
3/4” I.D. to 3” O.D.
19.1 mm I.D. to 76.2 mm O.D.

Agile enough to fit between small diameter boiler tubes, this rugged high-tech tool performs end preps on all types of hard alloys quickly and efficiently...

Key Features

Right angle tool rigidly mounts to tube I.D.
Sealed construction allow use in any orientation
Fits a “Dutchman” and handles hard alloys
Clamping system is self-centering and easy to use
EscoLock blade lock system securely holds cutting blades
Chatter-free end preps produce thick continuous chip
Torque-free operation with TiN coated cutting bits
Requires only (25 cfm), 708 lt./min air flow
Gear head design has performed millions of end preps
Field proven and simple to operate and maintain

The “Mongoose” is a nimble tool that is only 2-1/4” wide and weighs just 13 lbs. for easy handling.

The “Air Clamp” Tube Weasel MILLHOG® is ideal for production applications and takes only minutes to convert from a manual clamping end prep tool to one of the fastest clamping tools on the market.

Provides Superior Value and Performance
The ESCO “Tube Weasel” MILLHOG® is a lean, extremely durable tool that performs end preps on all boiler tube alloys quickly and efficiently. Featuring a right angle gear head drive system which incorporates dual opposed tapered roller bearings, this compact tool provides a big bite with a small appetite because it requires only (25 cfm), 708 It./min of air to pull a heavy continuous chip.

The “Tube Weasel” MILLHOG® is shipped complete with cutterhead, standard mandrel kit, operating instructions, tools, and a rugged metal carrying case.


The “Tube Weasel” fits a Dutchman window for single tube end prep work and totally sealed construction allows it to be used in any orientation. Most importantly, the holding clamps are designed to stay on the mandrel and not fall down the tubes.

“Tube Weasel” features the rigid EscoLock blade lock system and titanium nitride coated cutter blades which combine to pull a thick continuous chip on all types of tube and pipe without cutting oils.

Ordering Information
Kit No.	Description
TW-200	“Tube Weasel” Millhog tool kit
	Kit Includes: Motor and gear drive Feed mechanism Clamp rib and pad sets (H-01–H-05) Cutterhead, 3” Draw rod & wrench assembly Carrying case Allen wrench set Operating instructions
TW-240	Mandrel kit, 3/4”
	Kit Includes: Mandrel, 3/4” Drawrod assembly Cutterhead, for 3/4” mandrel Clamp rib set (.750” I.D.–.905”) Clamp rib set (.875”–1.030”) Clamp rib set (1.000”–1.155”) Clamp rib set (1.125”–1.280”)

Specifications for Tube Weasel Millhog®
Working Range:	3/4” (19.1 mm) I.D.to 3” (76.2 mm) O.D.
Motor, pneumatic	2/3 h.p. (.497 kw)
Air Pressure	90 psi.(6.2 bar)
Air Volume	25 cfm (708 It/min.)
Speed	200 RPM
Minimum Clearance	3” (76.2 mm)
Head Length	14-1/2” (368.3 mm)
Working Weight	18 lbs. (8.2 kg)
Shipping Weight	40 lbs. (19 kg)
Shipping Dimensions	20” x 18” x 5” (508 mm x 457 mm x 127 mm)
Manufacturer reserves the right to change specifications without notice.

Part #	Spares for clamp ribs
G-14	Spring for G-04 through G-13 ribs
G-14C	Band for G3 clamp ribs
G-14D	Band for G1 & G2 clamp ribs
G-15	Actuator roll pin .625” & .750”
G-15A	Actuator roll pin .500”
G-16	Actuator for .625” I.D.
G-17	Actuator for .750” I.D.& up
G-17A	Actuator for .500” I.D.
H-11	Actuator roll pin
H-12	Actuator 1.250” I.D. and larger
H-14B	Spring for H1–H4 ribs

“Tube Weasel” MILLHOG® clamp rib selector
Item No.	Description	I.D. Range (in.)	I.D. Range (mm)	Mandrel Size
G-03	Clamp rib set	.750 – .905	19.1 – 22.9	3/4” (19.1 mm)
G-04	Clamp rib set	.875 – 1.030	22.3 – 26.1	3/4” (19.1 mm)
G-05	Clamp rib set	1.00 – 1.155	25.4 – 29.3	3/4” (19.1 mm)
G-06	Clamp rib set	1.125 – 1.280	28.6 – 32.5	3/4” (19.1 mm)
H-00	Clamp rib set	1.000 – 1.300	25.4 – 33.0	1" (25.5 mm)
H-01	Clamp rib set	1.375 – 1.600	34.9 – 40.6	3/4”& 1.25” wedge
H-02	Clamp rib set	1.525 – 1.925	38.8 – 48.9	3/4”& 1.25” wedge
H-03	Clamp rib set	1.850 – 2.250	47.0 – 57.2	3/4”& 1.25” wedge
H-04	Clamp rib set	2.175 – 2.575	55.3 – 65.4	3/4”& 1.25” wedge
H-02 & H-05	Clamp rib set & pad set	2.500 – 2.900	63.5 – 73.7	3/4”& 1.25” wedge

See below for other products related to the Tube Weasel Millhog®

Tube Weasel Millhog Kits

Blades for the Tube Weasel Millhog

Parts for the Tube Weasel Millhog

Air Motor Parts for the Tube Weasel Millhog

Air Hose Parts for the Tube Weasel Millhog

3/4 inch Mandrel Kit Parts for the Tube Weasel Millhog