Pneumatic underpinner Alfamacchine U 300 P

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The U-300P is a bench top, base model for production joining applications where the customer is looking for speed and repeatability of joining the same sized moulding. The design of the U-300P allows the operator to set up to 3 position stops for V-Nail insertions. The nail head pneumatically moves underneath the fixed frame and the joining cycle is actuated first by the hand lever locating the pre-set V-Nail position and then the V-Nail is inserted by actuating the foot pedal. For those customers looking a similar type of joining machinery but require flexibility of joining different moulding sizes, refer to our U-300 unit.


Recommended for production joining requirements

Features pneumatic loader to eliminate nail jams

“Soft Clamping” pneumatic feature for damage free joints

Quick-change magnetic pad hold down feature fitting most moulding profiles

Operates only with pneumatic air, no electrical hook-up needed

Dual actuation functions for V-Nail position and pre-set V-Nail insertion

Designed with a unique trouble free piston V-Nail driver block-blade system for years of dependable single and multi-stacking operations


Moulding Width (min to max) ¼” up to 3 1/4” (6-80 mm)

Moulding Height (min to max) ¼” up to 3 ¼” (6-80 mm)

Max Distance Between V-Nails (stroke) 5” (125 mm)

Pre-set V-Nail Position Stops 3

V-Nail Sizes 5, 7,10,12,15 mm (SW-HW-HDF)

V-Nail Channel Capacity 220 V-Nails


7mm Nail Head

10mm Nail Head

12mm Nail Head

Single Vertical Positive Placement Clamp

Single Metal Pressure Plate

Magnetic Support for Vertical Placement Clamp

Blue Rubber Pads (SW)

Yellow Rubber Pads (MW)

Black Rubber Pads (HW)

Adjustable Fence (3 knobs)

4mm Allen Wrench

5mm Allen Wrench

Magnetic V-Nail Pick-up Tool

Machine Manual


Extension Wings Kit

Floor Stand Option

Magnetic Base for Clamp Assembly

Single Placement Vertical Clamp Kit

Single Metal Pressure Plate

Magnetic – Single Metal Pressure Plate

Blue Replacement Pad (recommended for SW)

Yellow Replacement Pad (recommended for MW)

Black Replacement Pad (recommended for HW)

Round Felt Pad, Small, 6/PK

Double Hydraulic Clamp Hold Down System

Adjustable Fence (2 knobs)

Nail Head – 3mm

Nail Head – 5mm

Nail Head – 7mm

Nail Head -10mm

Nail Head – 12mm

Nail Head – 15mm

Additional information

Weight36 kg