Piston Driver Replacement for Hitachi NR83A NR83A2 Framing Nailer Parts, 3 Pack 877-323 Driver & 4 Pack 883-511 Green Bumper Kit, Heat Treated 6150 Steel 885-915 Rebuild Set

table {width: 100%; border-collapse: collapse;} th, td {border: 1px solid #ddd; padding: 8px; text-align: left;} th {background-color: #f2f2f2;}Professional Grade Piston Driver and Bumper Rebuild KitRestore the driving force of your pneumatic tools with the Jaruika aftermarket replacement kit. Designed to address the high-wear demands of professional framing, this set provides the essential core components needed to rebuild the firing mechanism of compatible nailers. The piston drivers utilize a mechanical locking interface to resist the intense vibration of daily use, while the green bumpers offer high-density impact absorption to protect the tool housing.Technical SpecificationsSpecificationDetailCompatible BrandsFits Hitachi / Metabo HPTCompatible ModelsNR83A, NR83A2, NR83A2(S)Replacement Part # (Driver)877-323, 885-915Replacement Part # (Bumper)883-511, 878-303, 878-649Driver MaterialHeat Treated Tool Steel 6150Piston MaterialAerospace Grade 2024 AluminumHardness RatingRockwell 50-52Included Quantity3 Drivers + 4 BumpersFrequently Asked QuestionsQ: Will this fit the NR83A3 or NR83A5 models?A: This kit is primarily specified for the NR83A and NR83A2 series. While some components may share dimensions, we recommend verifying your tool's parts diagram against part numbers 877-323 and 883-511 for exact fitment.Q: How does this driver prevent the shaft from unscrewing?A: Unlike standard threaded connections that can loosen over time, our piston drivers feature a crimped aluminum-to-steel interface. This micro-mechanical lock secures the shaft into the piston grooves, preventing separation during operation.Q: Is the bumper material durable enough for cold weather?A: Yes, the high-density polymer used in the green bumpers is designed to maintain resilience in various working temperatures, preventing the cracking often seen in brittle plastic alternatives.

• Direct Fit Compatibility: Engineered as a precise replacement for Hitachi NR83A, NR83A2, and NR83A2(S) framing nailers. This 7-piece set substitutes part numbers 877-323, 885-915, and 883-511, ensuring seamless restoration of pneumatic pressure without modifying the gun body
• Mechanically Locked Interface: Addresses common failure points where drivers unscrew during high-vibration operation. The aerospace grade aluminum piston is crimped into unilok shaft grooves, creating a micro-mechanical bond that prevents loosening under heavy daily recoil
• Hardened Tool Steel: Manufactured from 6150 steel heat-treated to Rockwell hardness 50-52. This metallurgy balances impact resistance with flexibility, reducing the risk of snapping when driving nails into engineered lumber or dense hardwood framing materials
• High Density Green Bumpers: Includes 4 reinforced piston bumpers designed to absorb excessive shock and protect the cylinder. These components replace 878-303 and 878-649, maintaining consistent firing depth and extending the service life of the nail gun assembly
• Optimized Maintenance Supply: Contains 3 driver blades and 4 bumpers to support multiple service cycles. Keeping these critical spares on hand minimizes downtime during roofing or framing projects when immediate repair is necessary to maintain workflow
• Heavy Duty Application: Developed for professional contractors requiring reliable performance in stick framing and sheathing. The components withstand the thermal and mechanical stress of rapid-fire bumping modes standard in residential construction environments
• Package Contents: Each box contains three piston driver assemblies and four protective bumpers. All parts are verified for dimensional accuracy to fit specific mentioned pneumatic nailer models, providing a cost-effective alternative to purchasing a new tool