DeWalt 174055 O-Ring (44.7mm x 3.5mm) – Genuine OEM Replacement Nailer Seal

Part Number: 174055
Category: Air Tool Parts & Accessories → Nailer Parts → O-Rings & Seals
Type: DeWalt 174055 O-Ring (44.7mm × 3.5mm) – Genuine OEM Replacement Nailer Seal

The DeWalt 174055 O-Ring is a genuine OEM replacement pneumatic seal designed for compatible DeWalt and Bostitch air nailers. Measuring 44.7 mm × 3.5 mm, this precision-manufactured O-ring creates an airtight seal between internal pneumatic components, helping maintain proper air pressure for consistent driver operation and reliable nail feeding. Manufactured to original equipment specifications, it provides a direct-fit replacement for worn, cracked, flattened, or leaking seals, helping restore the nailer's original performance and efficiency.

Key Features & Benefits

• Part Number: 174055
• Genuine OEM DeWalt replacement part
• Replacement pneumatic O-ring seal
• Dimensions: 44.7 mm × 3.5 mm
• Maintains proper internal air pressure
• Helps eliminate pneumatic air leaks
• Durable, high-quality elastomer construction
• Direct-fit OEM replacement
• Manufactured to original equipment specifications

Technical Specifications

Part Number: 174055

Manufacturer: DeWalt

Product Type: O-Ring / Pneumatic Seal

Size: 44.7 mm × 3.5 mm

OEM Part: Yes

Application: Pneumatic Nailer Air Seal

Compatible Applications

The DeWalt 174055 O-Ring fits select:

Bostitch

• CF15 Corrugated Tool (Type 0)
• MCN150 StrapShot Metal Connector Nailer (Type 0)
• MCN250 35° Metal Connector Framing Nailer StrapShot (Type 0)
• MCN250S 35° Metal Connector Framing Nailer StrapShot – Short Magazine (Type 0)
• N66C-1 1-1/4" to 2-1/2" Coil Siding Nailer with Aluminum Housing (Type 62860000 and Higher)
• N66C-1 1-1/4" to 2-1/2" Coil Siding Nailer with Aluminum Housing (Type 072400000 and Higher)
• N75C-1 15° Coil Sheathing & Siding Nailer (Type 0)

DeWalt

• DW66C-1 15° Coil Siding Nailer (Type 0)
• DW66C-1 Air Nailer & Stapler (Type 17300000 and Higher)
• DWMC150 1.5" Metal Connector Nailer (Type 1)

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

Function of the O-Ring

The DeWalt 174055 O-Ring is a critical sealing component within the nailer's pneumatic system. It helps to:

• Create an airtight seal between internal components
• Maintain proper operating air pressure
• Reduce air leakage
• Improve firing consistency
• Support efficient piston movement
• Restore the nailer's original pneumatic performance

Using a genuine OEM replacement O-ring helps ensure proper fit, dependable sealing, and long-term air tool reliability.

Common Signs Replacement Is Needed

Replace the O-ring if you notice:

• Air leaking from the tool
• Reduced driving power
• Nails not fully seating
• Inconsistent firing
• Cracked, flattened, or brittle O-ring
• Air escaping from the cylinder during operation

A worn or damaged O-ring can reduce pneumatic efficiency, increase air consumption, and lead to inconsistent nail driving performance.

Installation & Service Notes

Disconnect the nailer from the air supply and remove all fasteners before performing any repairs.

Disassemble the pneumatic assembly according to the manufacturer's service instructions to access the 174055 O-Ring. Remove the worn seal and inspect the cylinder, piston, valve components, and sealing grooves for dirt, scoring, or damage. Lightly lubricate the new O-ring using a pneumatic tool lubricant before installation, taking care not to twist or pinch the seal. Reassemble the tool, reconnect the air supply, and verify leak-free operation before returning the nailer to service.

Important: Always verify your tool model, type number, and original part number before ordering. Replace other worn O-rings during major service intervals to maintain optimum pneumatic performance. Use genuine OEM DeWalt replacement seals to ensure proper fit and long-term reliability.

Maintenance Recommendations

• Lubricate pneumatic seals with the manufacturer's recommended air tool oil.
• Inspect O-rings regularly for cracking, flattening, or wear.
• Keep internal air passages clean during servicing.
• Replace worn seals promptly to prevent air leaks.
• Drain moisture from the air compressor regularly to extend seal life.
• Use genuine OEM replacement parts to maintain factory fit, reliable sealing, and long-term pneumatic nailer performance.