SAE J1671-2023 PDF

Full title and description

St SAE J1671-2023 — Outboard Mounted Brake Drum/Disc Wheel Hub Interface Dimensions - Truck and Bus. This SAE recommended practice defines the interface dimensions and tolerances for outboard-mounted brake drums and disc-type wheel hubs used on heavy commercial vehicles (typically Class 7 and 8), and references SAE J694 mounting systems included in the scope.

Abstract

This recommended practice specifies the geometric interface features, true-position requirements, dimensional limits and tolerances for outboard-mounted brake drums and disc wheel hubs used on truck and bus applications. It is intended to ensure interchangeability of drums, hubs and mounting hardware for common SAE wheel-mount systems in heavy commercial vehicles.

General information

• Status: Reaffirmed / Current
• Publication date: May 19, 2023 (J1671_202305)
• Publisher: SAE International
• ICS / categories: Wheels; Brake drums; Mountings; Commercial vehicle wheel and hub interfaces
• Edition / version: J1671_202305 (reaffirmed May 2023; revisions historically in 2019, 2015, 2006, 1997)
• Number of pages: 6.

Scope

The standard contains dimensions and tolerances for outboard-mounted brake drums and disc wheel hubs in the interface areas for Class 7 and 8 commercial vehicles. It covers the common SAE J694 mounting systems (II, III, IV, XIV and X) and is not intended for special or less-common applications. The document focuses on interface geometry and tolerances required for mechanical interchangeability.

Key topics and requirements

• Interface dimensions for outboard-mounted brake drums and disc wheel hubs (bore, flange, bolt circle and true-position features).
• Tolerances and geometric true-position requirements to ensure hub/drum interchangeability and proper wheel mounting.
• Compatibility with SAE J694 mounting systems II, III, IV, XIV and X.
• Reference drawings and dimensional callouts for critical mating surfaces and fastener locations.
• Application limited to Class 7 and 8 truck and bus wheel/hub/drum systems; excludes special and uncommon mountings.

Typical use and users

Primary users are heavy-vehicle OEMs, axle and wheel hub manufacturers, brake drum suppliers, aftermarket wheel and hub producers, design and manufacturing engineers, quality and conformance teams, and test laboratories concerned with mechanical interchangeability and safe mounting of wheels on commercial trucks and buses.

Related standards

Directly related to SAE J694 (wheel mounting system definitions and dimensions) and other SAE wheel and brake interface documents that address wheel, hub and mounting compatibility for commercial vehicles. Historical and prior revisions of J1671 (2019, 2015, 2006, 1997) provide lineage and change history.

Keywords

SAE J1671, brake drum, wheel hub, outboard-mounted, interface dimensions, wheel mounting, Class 7, Class 8, SAE J694, tolerances, true position, truck and bus

FAQ

Q: What is this standard?

A: SAE J1671 is an SAE recommended practice that specifies interface dimensions and tolerances for outboard-mounted brake drums and disc wheel hubs on heavy commercial vehicles (truck and bus applications).

Q: What does it cover?

A: It covers the critical geometric features, dimensional limits and tolerances for the hub/drum interface areas to ensure interchangeability and proper wheel mounting for common SAE mounting systems used on Class 7 and 8 vehicles.

Q: Who typically uses it?

A: Heavy-vehicle OEMs, axle and hub manufacturers, brake drum suppliers, aftermarket wheel/hub producers, design and quality engineers, and testing organizations working on wheel-hub-drums for commercial trucks and buses.

Q: Is it current or superseded?

A: The edition identified as J1671_202305 (published/reaffirmed May 19, 2023) is the current/reaffirmed version; it carries forward earlier revisions (2019, 2015, 2006, 1997).

Q: Is it part of a series?

A: J1671 is part of SAE’s family of wheel, hub and mounting standards for commercial vehicles and is commonly used alongside SAE J694 (mounting systems) and other SAE wheel/axle/brake interface documents.

Q: What are the key keywords?

A: Brake drum, wheel hub, interface dimensions, wheel mounting, SAE J1671, SAE J694, tolerances, commercial vehicle, truck, bus.