Dorman 675-240 Exhaust Manifold Hardware Kit

Dorman Exhaust Manifold Hardware Kit 675-240

Dorman 675-240 is an exhaust manifold hardware kit made to match the original hardware used to secure the exhaust manifold to the engine on specified vehicles. Built from steel with a standard replacement grade, it supports a direct-fit repair for Nissan and INFINITI applications that need OE-style manifold fasteners.

• OE-style exhaust manifold hardware for specified Nissan and INFINITI vehicles
• Steel studs and steel nuts with a silver finish
• Standard replacement grade for manifold-to-engine fastening service
• M10-1.25 thread size on both stud ends
• Coarse thread design on both ends for the listed applications
• Stud grade 10.9 for demanding exhaust hardware service
• Designed for vehicles including Nissan Frontier, Murano, Pathfinder, Altima, Maxima, 370Z, 350Z, Xterra, Quest, NV1500, NV2500, NV3500, GT-R, Z, and INFINITI QX60, QX70, QX50, QX4, G35, G37, Q70, and more

Detailed Product Overview

This exhaust manifold hardware kit is built around the original fastener specifications used on a wide range of Nissan and INFINITI models. The studs measure 56.3 mm in length and use M10-1.25 threads on both ends, with 17.15 mm thread length on one end and 22.8 mm on the other. The steel construction and 10.9 stud grade provide the hardware profile expected for exhaust manifold attachment service, while the silver finish gives the kit a clean, corrosion-resistant appearance. Dorman 675-240 is a practical choice when replacing worn, damaged, or missing manifold fasteners on vehicles such as the Nissan Frontier, Murano, Pathfinder, Altima, Maxima, 370Z, and INFINITI QX60 or G37. This part cross-references Nissan OE numbers 140949BA0A and 1406431U0C for the same application.

What This Part Helps Address

• Loose or missing exhaust manifold fasteners
• Broken or heat-damaged manifold studs
• Worn nuts that no longer hold proper clamping force
• Exhaust leaks at the manifold-to-engine connection
• Service repairs on high-mileage Nissan and INFINITI exhaust systems

Installation Notes and Tips

Before installation, verify thread size, stud length, and vehicle application against the existing manifold hardware. Clean the mounting surfaces and inspect the exhaust manifold and cylinder head for damage, warping, or stripped threads before tightening the new hardware. Because exhaust fasteners are exposed to high heat cycles, follow the vehicle service manual for torque sequence and final torque specifications.

Quality Assurance

Dorman manufactures this kit as a standard replacement exhaust manifold hardware solution using quality materials for reliable performance. It is engineered to match the original hardware requirements for the listed vehicles, including many 2001-2023 Nissan and INFINITI applications.