Metabo HPT N3804AB3(S) 18-Gauge 1/4″ Narrow Crown Pneumatic Finish Stapler, 1/2″–1-1/2″ Fasteners, 70–120 PSI

Condition: Used. Shows noticeable jobsite wear, including scratches, scuffs, dirt, finish wear, and oxidation on portions of the magazine and hardware.

Description

The Metabo HPT N3804AB3(S) is a lightweight pneumatic narrow-crown finish stapler designed for 18-gauge, 1/4-inch crown staples from 1/2 inch through 1-1/2 inches long. It is intended for finish carpentry, cabinetry, trim, furniture construction, panel installation, and other applications where the holding power of a staple is preferred over a finish nail.

The tool operates from a conventional compressed-air supply at 70–120 PSI and uses a straight magazine holding up to 100 staples. At approximately 2.3 lb, the N3804AB3 is relatively light for extended finish work. Factory documentation lists tool-free depth adjustment, selectable sequential/contact actuation, a quick-clear nose, adjustable exhaust, and an angled air fitting among its features.

The photographed tool carries Metabo HPT branding, while earlier documentation for the same N3804AB3 platform may appear under the Hitachi name due to the brand transition.

Specifications

• Manufacturer: Metabo HPT
• Model: N3804AB3(S)
• Tool Type: Pneumatic narrow-crown finish stapler
• Fastener Type: Narrow crown finish staples
• Staple Gauge: 18 Gauge
• Staple Crown: 1/4 in.
• Fastener Length Range: 1/2–1-1/2 in.
• Magazine Type: Straight
• Magazine Capacity: 100 staples
• Operating Pressure: 70–120 PSI
• Metric Pressure Range: approximately 4.9–8.3 bar
• Air Consumption: approximately 0.025 ft³ per cycle at 100 PSI
• Metric Air Consumption: approximately 0.73 L/cycle at 6.9 bar
• Weight: approximately 2.3 lb / 1.0 kg
• Dimensions: approximately 10-11/32 × 9-1/4 × 2-3/8 in.
• Metric Dimensions: approximately 263 × 235 × 60 mm
• Air Fitting: 1/4 in.
• Actuation: Selectable sequential or contact/bump operation
• Depth Adjustment: Tool-free
• Exhaust: Adjustable
• Nose: Quick-clear design for jammed staple access

These dimensions and operating specifications are listed in the factory N3804AB3 manual.

Features

• Lightweight pneumatic design
• 18-gauge narrow-crown fastening system
• 1/4-inch crown staples
• Accepts multiple staple lengths from 1/2 to 1-1/2 inches
• 100-staple magazine capacity
• Tool-free drive-depth adjustment
• Selectable firing mode
• Sequential-fire operation for controlled placement
• Contact/bump actuation for faster repetitive fastening
• Tool-less quick-release nose for clearing jams
• Elastomer-covered grip
• Ergonomic pistol-grip construction
• Adjustable exhaust direction
• Upward-angled air connection helps keep the hose away from the workpiece
• No-mar nose arrangement for finished surfaces
• Compact straight magazine
• Suitable for portable compressor operation

Metabo HPT specifically lists selectable actuation, tool-free depth adjustment, 100-staple capacity, adjustable exhaust, and an ergonomic non-slip design for this model.

Compatible Staples

The N3804AB3 uses 18-gauge, 1/4-inch narrow crown finish staples with leg lengths between:

• 1/2 in.
• 5/8 in.
• 3/4 in.
• 1 in.
• 1-1/4 in.
• 1-1/2 in.

Metabo HPT identifies its 18-gauge 1/4-inch narrow-crown staples as compatible with the N3804AB3.

Applications

Typical applications include:

• Cabinet assembly
• Cabinet backs
• Drawer construction
• Furniture manufacturing and repair
• Interior trim
• Moldings
• Decorative trim
• Paneling
• Wood lattice
• Light woodworking
• Casework
• Upholstery framing
• Crafts and shop fabrication
• Thin wood fastening
• Finish carpentry
• Sheathing in appropriate light-duty applications
• Crate and light packaging construction

Because this is a narrow-crown finish stapler, it is not intended as a substitute for a structural framing nailer.

Air Compressor Requirements

The tool requires a regulated compressed-air source capable of maintaining 70–120 PSI at the stapler during operation.

Factory documentation specifies approximately 0.025 ft³ of compressed air per firing cycle at 100 PSI, making the tool practical with many portable construction compressors, provided the compressor can maintain sufficient recovery for the intended firing rate.

A regulator, suitable pneumatic hose, and properly rated fittings should be used. The operating-pressure limit should not be exceeded.

Included Items Shown

Based on the supplied photographs, the set appears to include:

• Metabo HPT N3804AB3(S) pneumatic stapler
• Molded hard carrying case
• Safety glasses in protective bag
• Instruction and safety manual
• Warranty literature
• Installed pneumatic quick-connect fitting

The original factory package for the N3804AB3 was also specified with safety glasses, a no-mar nose cap, air plug, and carrying case.

Cross-Referenced Models

Models in the same or closely related Metabo HPT narrow-crown stapler family include:

• Metabo HPT N3804AB3
• Metabo HPT N3804AB3(S)
• Hitachi N3804AB3
• Hitachi N3804AB3(S)
• Metabo HPT N3804A5 — newer 18-gauge, 1/4-inch narrow-crown PRO finish stapler
• Metabo HPT N1804DA — cordless 18V 18-gauge 1/4-inch narrow-crown stapler
• Metabo HPT N1804DB — cordless 18-gauge narrow-crown stapler

The newer N3804A5 retains the basic 18-gauge, 1/4-inch crown and 1/2–1-1/2-inch fastener range while adding features such as an integrated air duster.

Comparable Products

Comparable pneumatic narrow-crown staplers include 18-gauge 1/4-inch crown models from:

• Makita
• Bostitch
• DeWalt
• Senco
• Porter-Cable
• Milwaukee
• Grex

When selecting a substitute, verify staple gauge, crown width, staple length range, operating pressure, magazine type, and fastener-series compatibility. Similar-looking 18-gauge staples are not automatically interchangeable.

Related

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Common Requests:

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• replacement for Hitachi N3804AB3 narrow crown staple gun
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