DeWalt N439275 Anvil Assembly – Genuine OEM Replacement Impact Driver Anvil Assembly

Part Number: N439275
Category: Power Tool Parts → Impact Driver Parts → Anvil Assemblies
Type: DeWalt N439275 Anvil Assembly – Genuine OEM Replacement Impact Driver Anvil Assembly

The DeWalt N439275 Anvil Assembly is a genuine OEM replacement anvil assembly designed for compatible DeWalt cordless impact drivers. This precision-machined component forms the tool's output shaft and 1/4-inch quick-change bit holder, transferring rotational torque and impact force from the hammer mechanism to the driver bit. Manufactured to original equipment specifications, it provides a direct-fit replacement for worn, damaged, or excessively loose anvils, restoring reliable bit retention and impact performance.

Key Features & Benefits

• Part Number: N439275
• Genuine OEM DeWalt replacement part
• Complete replacement anvil assembly
• Includes integrated 1/4-inch quick-change bit holder
• Transfers impact energy from the hammer mechanism to the fastener
• Precision-machined steel construction for durability
• Direct-fit OEM replacement
• Manufactured to original equipment specifications

Technical Specifications

Part Number: N439275

Manufacturer: DeWalt

Product Type: Anvil Assembly

Material: Hardened Steel

Drive Size: 1/4 in. Hex Quick-Change

Application: Cordless Impact Driver

OEM Part: Yes

Quantity: Sold Individually

Compatible Applications

The DeWalt N439275 Anvil Assembly fits compatible DeWalt impact drivers, including:

DeWalt

• DCF787 Type 1
• DCF887B Type 1
• DCF887B Type 2
• DCF887B Type 3
• DCF887D2 Type 1
• DCF887D2 Type 2
• DCF887M2 Type 1
• DCF887M2 Type 2
• DCF888B
• DCF809 (select models and types)

It is also used on select Craftsman V20 Impact Drivers, including:

• CMCF810
• CMCF820
• CMCF813 (select models)

Always verify your tool model, type number, and original part number before ordering to ensure proper compatibility.

Function of the Anvil Assembly

The N439275 Anvil Assembly is designed to:

• Hold 1/4-inch hex driver bits securely
• Transfer rotational torque and hammer impacts
• Deliver fastening power to screws and bolts
• Support quick bit changes
• Maintain proper alignment of the impact mechanism
• Restore original factory driving performance

Using a genuine OEM replacement anvil assembly helps maintain proper bit retention, impact efficiency, and long-term tool reliability.

Common Signs Replacement Is Needed

Replace the anvil assembly if you notice:

• Excessive bit wobble
• Driver bits falling out or not locking securely
• Rounded or worn hex socket
• Reduced fastening performance
• Visible wear or damage to the anvil
• Difficulty inserting or removing bits

A worn anvil assembly can reduce fastening accuracy and may cause poor bit retention or inconsistent impact performance. Community repair reports also note that excessive chuck wobble can result from a worn anvil assembly.

Installation & Service Notes

Remove the battery pack before performing any maintenance.

Disassemble the front gear housing according to the manufacturer's service instructions to access the hammer and anvil assembly. Carefully remove the retaining components, springs, and washers while noting their orientation. Install the new N439275 Anvil Assembly, ensuring all internal components are correctly positioned and lightly lubricated with the manufacturer-recommended grease. Reassemble the gear case, tighten all fasteners to specification, and verify smooth bit insertion, retention, and tool operation before returning the impact driver to service.

Important: Always verify your impact driver model and type number before ordering. Inspect the hammer mechanism, retaining ring, washer, and nose assembly for wear whenever replacing the anvil assembly, replacing any damaged components at the same time.

Maintenance Recommendations

• Keep the bit holder clean and free of metal debris.
• Periodically inspect the anvil for wear and excessive play.
• Replace worn retaining rings or springs if bit retention decreases.
• Use only impact-rated accessories.
• Lubricate internal hammer components during major service intervals.
• Use genuine OEM replacement parts to maintain factory fit, reliable bit retention, and long-term impact driver performance.