The Porter-Cable RN175 is a pneumatic coil roofing nailer designed for fastening shingles and other roofing materials. Because it is an older model, buyers and owners often need help identifying compatible nails, checking operating requirements, finding parts, or diagnosing feeding problems. This guide explains the RN175’s typical uses and setup, outlines safe operating practices, and offers practical maintenance and troubleshooting steps. Owners should confirm exact specifications in the manual for their particular tool, since parts, revisions, and available documentation can vary.
What Is the Porter-Cable RN175?
The Porter-Cable RN175 is a pneumatic roofing nailer, meaning it uses compressed air to drive nails. Its coil-style magazine holds a connected strip of roofing nails, reducing reload frequency compared with many straight-magazine nailers. The tool is intended for roofing applications such as installing asphalt shingles, subject to the material and fastener requirements for the job.
The RN175 is not a framing nailer or a general-purpose finish nailer. Roofing nailers are designed around short, large-head nails that help hold roofing material in place. Using the wrong fastener can cause poor holding, material damage, or a jam. The tool’s name, model label, and manual should be checked before ordering nails or parts.
RN175 searches may bring up used tools, replacement parts, manuals, and compatible nail listings. Availability can differ by seller and location. Since the RN175 is an older product, it is especially important to verify model numbers and dimensions rather than assuming a listing labeled “Porter-Cable roofing nailer” fits every version.
Porter-Cable RN175 Specs and Compatibility
Published listings and documents for older tools may differ, and not every online listing is an authoritative specification. The table below summarizes the details owners should verify before putting an RN175 into service. The manual and markings on the tool take priority over a retailer’s general description.
| Item | What to Check |
|---|---|
| Tool type | Pneumatic coil roofing nailer |
| Fastener style | Coil roofing nails with the collation type and angle specified for the RN175 |
| Nail length | Confirm the approved range in the manual; RN175 listings commonly identify roofing nails in the 3/4- to 1-3/4-inch range |
| Air pressure | Use the manual’s operating range and never exceed its maximum pressure |
| Air connection | Check the tool inlet and fitting size before connecting a hose |
| Magazine capacity | Confirm the manual or tool documentation; capacity can depend on nail size and coil configuration |
Choosing Compatible Roofing Nails
Compatibility involves more than nail length. Check the nail’s head diameter, shank type, material, coil angle, and collation. A nail may appear to fit in the magazine yet feed poorly if its coil arrangement or connector differs from the tool’s requirements. Follow the RN175 manual and the roofing-material manufacturer’s fastening instructions.
For asphalt shingles, nail length depends on roof-deck thickness, shingle construction, and local requirements. Laminated shingles or applications involving multiple layers may call for longer fasteners than a standard installation. Nails must penetrate the required amount of decking without protruding through the underside. The shingle manufacturer’s instructions and applicable building code determine the correct choice.
Corrosion resistance matters, too. Roofing nails should be suitable for the exposure and roofing material. In coastal or otherwise corrosive environments, local code and product guidance may specify corrosion-resistant fasteners. Galvanized, stainless-steel, or other coated nails are not interchangeable in every situation; confirm material compatibility with the roofing manufacturer.
How to Set Up the RN175
Before connecting air, inspect the nailer for damaged parts, loose fasteners, a cracked housing, or a trigger that does not move and return correctly. Check the air hose and fittings for leaks or damage. If the tool has been dropped, repaired, or stored for a long period, inspect it carefully before use.
- Read the manual. Confirm the nail specifications, pressure range, lubrication requirements, and loading procedure for the exact RN175 version.
- Disconnect the air supply. Keep the tool disconnected while loading nails, clearing a jam, making adjustments, or performing maintenance.
- Load the coil correctly. Open the magazine as instructed and position the coil so the nails feed in the prescribed direction. Do not force a coil that does not seat naturally.
- Connect the hose. Use a compressor and regulator capable of maintaining the manual’s recommended pressure while the tool is firing. Set the regulator within the specified operating range.
- Test on scrap material. Fire a few nails into a suitable test surface and assess the depth before starting the roof. Adjust pressure only within the tool’s allowed range.
Air pressure is not a substitute for correct technique or a suitable nail. If a nail sits too high, first check tool position, fastener compatibility, and pressure. If it sinks too deeply, reduce pressure within the permitted range and test again. Avoid raising pressure beyond the manual’s limit to compensate for a worn tool or unsuitable nails.
Operating the Nailer for Consistent Results
Hold the RN175 perpendicular to the roofing surface and place its nose where the roofing manufacturer specifies. The correct nail placement is critical: a nail that is too high, too low, or angled can weaken the installation or damage the shingle. Follow the shingle maker’s fastening diagram, especially for starter courses, valleys, ridges, and high-wind requirements.
Drive test nails before installing a full course. A properly seated nail should hold the material without cutting or tearing it. Overdriven nails can break through the shingle surface and reduce holding strength; underdriven nails can interfere with overlapping courses or remain exposed. If depth varies, check the compressor, hose, regulator, and tool condition rather than relying on a single adjustment.
Keep the tool stable and avoid firing while it is tilted or held loosely. Never point the nailer at a person, and keep hands and other body parts away from the nose and discharge area. Do not carry the tool with a finger on the trigger. Disconnect the air line before moving between work areas if the tool could be triggered accidentally.
Safety Practices for Roofing Work
A roofing nailer combines compressed air, sharp fasteners, and work at height. Appropriate eye protection is essential; hearing protection may also be needed depending on the work environment. Use suitable footwear and fall-protection systems for the roof and job conditions. OSHA’s fall-protection rules and the employer’s safety plan apply to roofing work; a nailer does not reduce the hazards of working on a roof.
Use only clean, dry, regulated compressed air within the tool’s specified limits. Before disconnecting an air hose, turn off the compressor or air supply and release pressure as appropriate. Never use oxygen, bottled gases, or other non-approved gases to power a pneumatic nailer. Do not alter the trigger, safety mechanism, or contact components.
Keep the nose pointed away from people when connecting the air supply. Follow the manufacturer’s instructions for the trigger and contact safety system. If a safety component is damaged or the nailer fires unexpectedly, stop using it and have it inspected by a qualified repair service. Do not attempt to bypass a safety device.
Common Porter-Cable RN175 Problems
Nailer Does Not Fire
Check whether the compressor is running, the regulator is set correctly, and the hose connection is secure. A kinked hose, leaking fitting, or pressure drop can prevent consistent operation. Disconnect the air supply before inspecting the trigger or safety contact. If the tool still will not fire, consult the manual for the model-specific procedure rather than disassembling the valve assembly without the right service information.
Nails Jam or Feed Incorrectly
Disconnect the air line before opening the magazine or clearing a jam. Remove damaged or bent nails and inspect the coil for the correct collation, direction, and fit. Check for debris in the magazine and for visible damage to the driver or feed mechanism. Do not strike or pry aggressively against the tool; doing so can damage components or create a hazard.
Nails Are Overdriven or Underdriven
Start by confirming the fastener is approved for the RN175 and the work surface. Test the tool on scrap and adjust air pressure gradually within the specified range. If the depth remains inconsistent, inspect the compressor output, regulator, hose length, fittings, and tool condition. Worn internal parts can affect driving performance and may require professional service.
Air Leaks or Reduced Power
Listen for leaks around the hose connection and tool body, then disconnect the air supply before inspecting fittings. Replace damaged hoses or fittings with components rated for the application. A leak inside the tool may indicate worn seals or another internal fault. Avoid adding oil unless the RN175 manual calls for it and specifies how much; excess or incorrect lubricant can cause operating problems.
Maintenance and Parts for an Older RN175
Routine care helps prevent feeding and performance issues. Keep the magazine and nose free of roofing debris, and wipe the exterior after use. Store the nailer in a dry place, protected from dust and impact. Follow the manual’s lubrication instructions exactly: some pneumatic tools require regular oiling, while others have different requirements. Incorrect lubrication can damage seals or contaminate the tool.
For repairs, identify the full model number from the tool’s label and compare any part number with an official manual or a reputable parts diagram. A listing that says “fits Porter-Cable” may apply to another model. Because older parts can be discontinued or sold through third parties, confirm fit and return terms before purchase. A qualified service center can help determine whether a worn or damaged tool is economical to repair.
Do not continue using a nailer with a damaged trigger, safety contact, cracked housing, persistent air leak, or unpredictable firing behavior. These conditions are reasons to disconnect the air supply and arrange inspection. Repairing a pressure-driven tool without the correct parts and procedures can create a serious injury risk.
Buying a Used Porter-Cable RN175
A used RN175 may be a practical purchase if it is complete, operates consistently, and can be serviced. Ask for clear photos of the model label, magazine, nose, trigger, air inlet, and any included case or accessories. Check whether the seller has tested it with the correct roofing nails and a regulated air supply.
- Look for cracks, bent magazine parts, missing screws, or signs of impact.
- Check that the trigger and contact safety move freely and return normally.
- Listen for air leaks and test several nails into scrap material.
- Confirm the tool’s manual, compatible fasteners, and replacement parts are available before purchase.
- Compare the price with newer nailers that may offer easier parts support or updated features.
Condition matters more than appearance. A clean exterior does not guarantee healthy seals or a reliable driver, and a tool that fires once may still misfeed during sustained use. If the seller cannot demonstrate safe operation, the cost of inspection and repair should be included in the buying decision.
Finding the RN175 Manual and Reliable Information
The most dependable source for model-specific loading instructions, pressure limits, lubrication, and maintenance is the Porter-Cable documentation for the RN175. Search by the complete model number and compare the document’s illustrations with the tool. Manufacturer support pages, archived manuals, and established tool-parts suppliers may have useful information, but online listings should not replace the manual’s safety requirements.
For roofing installation, consult the shingle manufacturer’s current instructions and local building-code requirements. These sources determine nail placement, fastener type, and installation details that can vary by product and location. For workplace fall protection and related safety requirements, refer to the U.S. Occupational Safety and Health Administration (OSHA) and applicable state rules.
The key to using a Porter-Cable RN175 successfully is matching the fastener and air settings to the tool, following roofing instructions, and keeping the safety mechanism and maintenance in good condition. When specifications are uncertain, verify them in the RN175 manual before connecting the tool or buying nails.
Sources and Further Reading
- Porter-Cable Support — product documentation and support resources.
- OSHA Fall Protection — federal workplace fall-protection guidance. Verify the current page address through OSHA’s website if the link does not open.
- Roofing product manufacturer installation instructions — consult the instructions for the specific shingle or roofing material being installed.