ASME B29.12M-1997 (2023) PDF

Full title and description

ASME B29.12M:1997 (R2023) — Steel Bushed Rollerless Chains, Attachments, and Sprocket Teeth. This standard specifies geometry, dimensions, strength data and interchangeability criteria for steel-bushed rollerless (rollerless) chains, common attachment types, and associated sprocket tooth forms and tolerances.

Abstract

This Standard defines the nomenclature, general proportions and designations, dimensional details for chains and attachments, sprocket tooth form and control limits, and tables of minimum ultimate tensile strengths, measuring loads and interchangeability limits for steel-bushed rollerless chains. It also includes guidance and tolerances for sprocket eccentricity and face runout and tabulates commonly used attachment configurations.

General information

• Status: Current — reaffirmed and under stabilized maintenance (R2023).
• Publication date: 1997 (original); reaffirmed 2023.
• Publisher: American Society of Mechanical Engineers (ASME).
• ICS / categories: 21.220.30 — Chain drives and their components (Mechanical systems and components for general use).
• Edition / version: ASME B29.12M:1997 (R2023).
• Number of pages: 24.

Scope

The standard applies to steel-bushed rollerless chains and their common attachments and sprocket teeth used for power transmission and conveying. It establishes chain series and designations, dimensional requirements for links and attachments, interchangeability limits, minimum ultimate tensile strength values, measuring loads, clearance dimensions and sprocket tooth form specifications. The document is intended to ensure dimensional interchangeability and to provide design and procurement data for manufacturers, OEMs and maintenance organizations.

Key topics and requirements

• Nomenclature and general chain proportions and series (chain numbering and designation).
• Dimensional tables for chain links, bushings, pins, and attachment plate types (A, K series, etc.).
• Minimum ultimate tensile strength values and recommended measuring loads.
• Interchangeability limits: maximum/minimum controlling dimensions for interchangeable links.
• Chain clearance and fit dimensions to ensure correct sprocket engagement.
• Sprocket tooth form specifications and form factors; tolerances for sprocket eccentricity and face runout.
• Recommended practices for selecting attachments and for matching chain to sprocket geometry.

Typical use and users

This standard is used by chain and sprocket manufacturers, mechanical designers and OEMs specifying power-transmission and conveyor drives, maintenance and reliability engineers selecting replacement chains and attachments, procurement/specification writers, and standards committees. Typical applications include conveyors, elevators, material-handling equipment and other machinery where rollerless (bushed) chains are preferred for abrasive or specific mounting/attachment needs.

Related standards

Other relevant standards include related ASME B29 series documents (for example B29.2M — inverted-tooth/silent chains; B29.10M — offset sidebar roller chains and sprockets), and international standards such as ISO 1977 (conveyor chains, attachments and sprockets) and ISO 487 (steel roller chains and attachments). These documents cover complementary chain types, test methods and sprocket dimensions useful when specifying interchangeability across systems and regions.

Keywords

steel-bushed, rollerless chain, attachments, sprocket teeth, chain dimensions, tensile strength, interchangeability, measuring load, sprocket tooth form, ASME B29.12M

FAQ

Q: What is this standard?

A: ASME B29.12M:1997 (R2023) is an ASME standard that specifies dimensions, strength data and interchangeability requirements for steel-bushed rollerless chains, their attachments and sprocket tooth forms.

Q: What does it cover?

A: It covers chain series and designations, dimensional requirements for links and attachments, tables of minimum ultimate tensile strengths and measuring loads, interchangeability/control dimensions, chain clearance data, standard attachment types (A-, K-series, etc.), and sprocket tooth form and tolerance criteria.

Q: Who typically uses it?

A: Chain and sprocket manufacturers, mechanical and conveyor designers, OEMs, maintenance and reliability engineers, procurement/specification writers, and standards bodies use the standard to specify, manufacture and maintain compatible chain-drive systems.

Q: Is it current or superseded?

A: The original edition was published in 1997; ASME records show the document was reaffirmed in 2023 (designated R2023) and placed on stabilized maintenance. As of February 20, 2026, the B29.12M:1997 (R2023) edition is the current ASME-listed version.

Q: Is it part of a series?

A: Yes. B29.12M is part of the ASME B29 family of standards covering chains, sprockets and related power-transmission components. Other related B29 standards address roller chains, inverted-tooth chains, offset sidebar chains and additional chain types.

Q: What are the key keywords?

A: Steel-bushed, rollerless chain, attachments, sprocket teeth, chain dimensions, tensile strength, interchangeability, ASME B29.12M.