What's the most common Bostitch roofing nailer repair?

O-ring replacement. The piston and head valve o-rings dry out from compressor heat and lack of lubrication, then start leaking air. A complete o-ring kit is available at competitive pricing and fixes 80% of air-leak complaints.

Are Bostitch RN46 parts interchangeable with the RN46-1?

Most wear parts (o-rings, driver, bumper, feeder pawl) are shared across the RN46 generations. Trigger valve and grip housing parts can differ — always verify by serial number before ordering.

Where do I find a Bostitch roofing nail gun parts diagram?

Bostitch publishes free exploded-view PDFs for every nailer on their support site. Look up your model number (RN46-1, BRN175A, N66C, etc.) and download the schematic — it's the fastest way to identify what you actually need.

Bostitch Roofing Nail Gun Parts: Common Repairs & Kits

A Bostitch roofing nailer is a simple machine, but every simple machine has a couple of parts that wear out predictably. Stock these few items in the truck and you can fix 90% of failures in the field instead of losing a day to the supply house.

The parts that actually wear out

You don't need a parts shelf — you need five small items in a Ziploc bag. Across the RN46, RN46-1, BRN175A, and N66C generations, the failure list is remarkably consistent.

1. O-ring kit (the #1 repair)

The piston and head-valve o-rings dry out, harden, and start passing air. Symptoms: hissing at rest, weak drives, or won't fire at all. A complete o-ring kit for the RN46 is available at competitive pricing and a rebuild takes 20 minutes once you've done it once.

2. Driver / driver blade

The driver eventually mushrooms or breaks at the tip — usually after thousands of nails or one bad jam. Replacement is available at competitive pricing. Keep one in the box, especially if your gun lives on production roofs.

3. Bumper

The piston bumper at the bottom of the cylinder absorbs the driver impact. Cracked bumpers cause loud reports, jarring kickback, and damage to the cylinder over time. to replace.

4. Feeder pawl & feeder spring

The pawl that advances the next nail wears down or the spring loses tension. Symptoms: skipped shots, double-feeds, or the coil drops back from the driver. Cheap fix, easy install.

5. Trigger valve assembly

The trigger o-rings inside the valve eventually leak. If air hisses from the trigger when you pull it, this is the part. Comes as a complete assembly — simpler than rebuilding the existing one.

How to identify your Bostitch model

Look at the spec plate on the magazine or near the grip. The most common roofing models you'll see in the field:

RN46 / RN46-1: The classic 15-degree coil roofing nailer. Most parts shared across generations.
BRN175A: Bostitch's later-generation coil roofing nailer with a redesigned trigger group.
N66C: Coil siding nailer — different angle (15° wire-coil) but shares some internals.
BTFP72156 (Smart Point): Strip nailer, not a roofing gun — different parts entirely.

Where to find an exploded parts diagram

Bostitch publishes free service PDFs for every nailer on their official support site. Search the model number, download the exploded view, and match the part number to your order. It's the only way to be sure you're buying the right o-ring kit for your specific generation.

The 5-minute maintenance habit that prevents most failures

2–4 drops of pneumatic tool oil down the air inlet at the start of every shift
Keep the magazine clean — blow it out with the same compressor
Wipe the nose flush with shingle granule grit at lunch
Drain the compressor tank daily — water in the air line kills o-rings fast

Do those four things and most Bostitch roofing nailers will run for 50,000+ nails before they need anything beyond an o-ring kit. Looking for the rest of the lineup? Browse Bostitch tools & parts.

Bostitch Roofing Nail Gun Parts: What Breaks & What to Keep on Hand