4 in Conduit Punch and Die 3/4-16UN Thread - Durable Hole Cutter

In this review the AMZCNC 4 in Conduit Punch and Die is judged as a straightforward, heavy-duty knockout solution for electricians and metalworkers who need a reliable 4 in conduit opening. The bottom line: it delivers clean holes in common electrical boxes and sheet metal thanks to hardened tool steel construction and a black oxide finish, and it works with standard 3/4-16UN draw studs. For anyone using a hydraulic knock out driver and needing a robust punch for up to 11 ga steel, this tool deserves attention.

Key Features

• Conduit fit: Sized for a 4 in conduit fitting so installers get the correct finished opening for standard conduit connections.
• Actual hole size: The punch produces an actual hole of 4.54 in, giving a true finished diameter that matches larger conduit fittings and reduces rework.
• Thread compatibility: Uses a standard 3/4-16UN thread so it fits common draw studs and many hydraulic knockout driver units.
• Material and finish: Made of hardened tool steel with a black oxide finish to resist wear and make the tool durable under repeated use.
• Punching capacity: Requires about 12 tons of force and is rated to cut 11 ga steel and thinner stainless, so it handles typical electrical box materials.
• Material versatility: Capable of punching steel, stainless steel, brass, copper, soft aluminum, fiberglass and plastic for broad jobsite use.

Who It's For

The punch is geared toward professional electricians, maintenance crews, and metal fabricators who already own or plan to use a hydraulic knockout driver capable of delivering around 12 tons of force. Its hardened tool steel construction and standard thread make it well suited to installers who need repeatable, clean openings in electrical boxes and light sheet metal.

It is not ideal for hobbyists without a hydraulic punch driver or for those who need to cut super-strong alloys such as 6061 or 7075 aluminum; users working with those materials should look for specialized tooling. Also, users who need a different finished diameter should confirm the 4.54 in actual hole before purchase.

Pros & Cons

Pros

• Robust construction with hardened tool steel and black oxide finish for longevity.
• Produces a clean 4.54 in hole that fits standard 4 in conduit fittings with minimal finishing.
• Standard 3/4-16UN thread fits many draw studs and hydraulic knockout driver brands.
• Handles a variety of materials including steel, stainless, brass, and softer aluminum alloys.

Cons

• Requires a hydraulic driver capable of roughly 12 tons, so additional equipment is needed if not already owned.
• Not suitable for cutting harder aluminum alloys like 6061 and 7075 or other super alloys.

Specifications

Conduit fitting size	4 in
Actual hole size	4.54 in
Thread	3/4-16UN
Required punching force	12 tons
Punching thickness capacity	1/8 in (11 ga) steel; 1/16 in stainless
Material	Hardened tool steel with black oxide finish
Compatible materials	Steel, stainless, brass, copper, soft aluminum, fiberglass, plastic

Our Verdict

The AMZCNC 4 in knockout punch is a solid, no-nonsense tool for professionals who need a dependable 4 in conduit opening and already use hydraulic knockout drivers. Its hardened construction and compatibility with standard 3/4-16UN draw studs give good value for the price, though buyers should confirm they have the required hydraulic capacity and avoid using it on super alloys.

Frequently Asked Questions

Will this fit my hydraulic punch driver?
It fits drivers that accept a 3/4-16UN draw stud, which is a common standard; confirm your driver thread before ordering.

What actual hole size does it make?
The die produces an actual finished opening of 4.54 in, slightly larger than the nominal 4 in conduit size.

What materials can it cut?
It is suitable for steel, stainless steel, brass, copper, softer aluminum alloys, fiberglass and plastic but not for harder alloys like 6061 or 7075.