SAE J663 is a stabilized standard originally issued in 1948 and stabilized in 2013 by the SAE Truck and Bus Foundation Brake Committee. It defines requirements for rivets used in brake linings and bolts used in brake blocks for heavy…

Introduction to SAE J667 This SAE Recommended Practice establishes a uniform laboratory procedure for evaluating performance and wear of automotive brakes and brake drums by inertia dynamometer simulation. The code is applicable to hydraulic, air, or electrically actuated brakes, with…

The precision of language is as critical as the precision of math in engineering. For vehicle dynamics professionals, SAE J670 has long been the definitive source for standardizing terms. After more than 30 years without a major revision, the 2022…

The SAE J651-2015 Recommended Practice provides a comprehensive framework for evaluating the performance and efficiency of automatic transmissions and transaxles used in passenger cars and light trucks. Originally developed for twentieth-century designs, the standard has been stabilized to preserve the…

1. Purpose and Scope of SAE J661-2021 The SAE J661 Recommended Practice establishes a uniform laboratory procedure for securing and reporting the friction and wear characteristics of brake linings. Developed in the 1950s and revised in 2021, this standard is…

This article discusses the key requirements of SAE J64-2007, a standard for snowmobile vehicle identification numbers (VINs), including visibility, durability, and design considerations for engineers and manufacturers. Although cancelled in 2007, its principles remain relevant for design and compliance. Introduction…

Since its initial issuance in 1951, SAE J641 has served as the authoritative reference for hydrodynamic drive terminology. The 2019 revision clarifies definitions, adds equations, and ensures consistent communication across design, testing, and documentation. This article summarizes the essential terms…

Effective communication is the foundation of successful engineering projects. In the field of automatic transmissions, where precise hydraulic control is essential, using consistent and accurate terminology is non-negotiable. SAE J648:2011, Automatic Transmission Hydraulic Control Systems – Terminology, provides a standardized…

SAE J635-2018 is a SAE Recommended Practice that provides a standardized approach for mounting engine cooling fans. Applicable to fans up to 2000 mm in diameter, it defines bolt circle and pilot hole dimensions for both fixed-drive and clutch-drive applications.…

The updated SAE J639-2020 standard provides essential safety and design requirements for refrigerant vapor compression systems used in mobile air conditioning (MAC). It applies to passenger cars, light trucks, and commercial vehicles, covering systems with belt-driven or electric compressors. The…

Standard Overview and Rationale SAE J626-2015 specifies dimensional requirements for eight types of end-mounting flanges for fuel injection pumps in diesel engines. Although the standard was cancelled in November 2015 and superseded by ISO 7299-1, it remains a reference for…

SAE J629 is a surface vehicle standard that specifies the dimensional requirements necessary for mounting and interchangeability of nozzle holder types 5 and 6 with a 21.0 mm nominal shank diameter, used with size ‘S’ nozzles in diesel engines. Although…

This SAE Recommended Practice provides a common language for describing radiators, their cores, and related accessories. Adopting these definitions ensures clarity across design, manufacturing, and procurement teams, reducing costly errors and misinterpretations. Why Standardized Nomenclature Matters In engine cooling system…

SAE J616 is a recommended practice that specifies foot mounting dimensions for engines intended for installation on subbases. Originally issued in 1957 and last revised in 1995, the standard was cancelled in July 2008 after the Powertrain Systems Group could…

The SAE J617-2020 standard defines major dimensions and tolerances for engine flywheel housings and mating transmission housing flanges, covering SAE No. 6 through No. 00 sizes. Its primary goal is to ensure interchangeability between engines and transmissions from different manufacturers,…

SAE J600-2011 provides laboratory test procedures for verifying that headlamp aim test machines can accurately aim or inspect the aim of forward lighting devices, including headlamps, fog lamps, and auxiliary high beam lamps. This standard does not apply to motorcycle…

SAE J609 (Revised 2003) provides a structured approach for ensuring interchangeability and robust fitment of power take-off (PTO) shafts and crankcase mounting flanges in small reciprocating piston engines. Engineered for engines rated at 14.9 kW (20 hp) or less, the…