878-156 Aftermarket Piston Driver

Name: 878-156 Aftermarket Piston Driver
Brand: APOROZONA
SKU: B0DKNN5FV8
Price: 26.99 USD
Availability: InStock
Rating: 4.3 (1 reviews)

878-156 Aftermarket Piston Driver for Hitachi Metabo NV45AB2 COIL NAILERS, Replacement Parts SP 878156 Pistón for Hitachi 1-3/4” Coil Roofing Nailers model N…

Live marketplace price $27

Buyer rating 4.3 / 5

Check price

Compatibility checkpoint

Verify this before you buy

4 listed model matches

1 Match the machine model

Compare the model printed on your trimmer label with the fitment list below.

2 Confirm the line and spool spec

Use the old spool and manual to confirm gauge, diameter, and feed style.

3 Check the part code

Match part B0DKNN5FV8 or ASIN B0DKNN5FV8 against the listing and your old part.

Listed model matches

Hitachi Metabo NV45AB2 COIL NAILERSReplacement Parts SP 878156 PistónHitachi 1-34” Coil Roofing Nailers model NV45AB NV45AB2 NV45AB2M NV45AB3 NV45AB2(S)

ReplacesB0DKNN5FV8

CategoryTrimmer

ConditionNew aftermarket replacement

Overview

Designed as a drop-in aftermarket replacement, this piston driver assembly restores reliable nail-driving power to worn or malfunctioning nailers. Over time, the OEM driver can develop wear marks and lose its seal, leading to shallow drives and double fires. This replacement part brings the tool back to original operating condition.

Key specifications

Aftermarket piston driver assembly
Direct OEM-equivalent replacement
Includes o-ring(s) for proper cylinder seal
Precision-machined for consistent nail depth

Compatibility

This piston driver is designed to fit Hitachi nailers as specified in the compatibility listing above. Always cross-reference the full model and type number stamped on your tool’s nameplate before ordering.

Installation notes

Disconnect the nailer from the air compressor or remove the battery before beginning disassembly. Remove the cap, pull out the old piston driver, and clean the cylinder bore before inserting the new assembly. Lubricate the o-rings with pneumatic tool oil for a proper seal and smooth cycling.

Common questions

Q: Will this 878-156 aftermarket piston driver fit my Hitachi NV45AB2S coil roofing nailer, or is it only for the NV45AB2?

Yes, this piston driver is made as a replacement for SP 878156 and fits the Hitachi/Metabo HPT 1-3/4” coil roofing nailer family including NV45AB, NV45AB2, NV45AB2M, NV45AB3, and NV45AB2(S). As long as your tool uses the 878156 piston/driver assembly, it should be the correct fit.

Q: I’m replacing the piston driver on an NV45AB3—do I need to replace any other parts at the same time?

It’s a good idea to inspect the driver guide, bumper, and head valve seals while you have the nailer apart, because wear in those areas can quickly damage a new piston driver. If the old driver broke or was bending nails, also check for debris in the nose and make sure the cylinder and O-rings are still in good condition.

Q: My NV45AB2 started misfiring and not driving nails fully—can a worn 878-156 piston driver cause that?

Yes, a worn, chipped, or shortened driver blade can cause weak drives, inconsistent nail depth, and frequent jams. When installing the new piston driver, clean the cylinder, lightly lubricate the seals with pneumatic tool oil, and verify the driver moves smoothly before reassembling the nailer.

Compatibility

This page lists compatible equipment gathered from the product fitment data. Always confirm the model number stamped on your machine before ordering.

Hitachi Metabo NV45AB2 COIL NAILERSReplacement Parts SP 878156 PistónHitachi 1-34” Coil Roofing Nailers model NV45AB NV45AB2 NV45AB2M NV45AB3 NV45AB2(S)

Before you buy — how to verify fitment

Find your trimmer model number. It's usually on a label on the motor housing, battery slot, or lower shaft.
Check spool compatibility. Compare the model number with the compatibility list above.
Verify line gauge. Confirm the line thickness matches what your trimmer head requires by checking your manual or the old spool.
Inspect the spool housing. Make sure the spool diameter, cap, spring post, and feed style match your trimmer head.

Frequently asked questions

How do I know this spool fits my trimmer?

Check your trimmer model number against the compatibility list above. Then verify the line gauge (.065, .080, .095) matches what your trimmer head requires — it's usually printed on the spool cap or in the manual.

Can I rewind a pre-wound spool?

Yes. Once the factory line runs out, you can rewind the spool with bulk trimmer line of the same gauge. Pre-wound spools just save time on the first load.

How often should I replace the spool?

Replace the spool when the line no longer feeds properly, the spring loses tension, or the spool body is cracked. Under normal weekend use, a spool lasts 2–4 refills before the housing wears out.

What gauge trimmer line should I use?

Match the gauge to your trimmer's power: .065" for light-duty electric trimmers, .080" for mid-range cordless, and .095" for gas-powered or heavy-duty models. Using too thick a line can stall the motor.

Where to buy

This part is available through Amazon with free returns on most orders. Use the fitment details above to compare your model, old part number, and physical specs before ordering.

Affiliate disclosure: we may earn a commission when you purchase through this link, at no extra cost to you.