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ASME: American Society of Mechanical Engineers

ASME, the American Society of Mechanical Engineers, is a nonprofit membership organization that promotes the art, science, and practice of multidisciplinary engineering and allied sciences around the globe. It develops mechanical engineering standards regarding the proper design, construction, and testing of many mechanical devices, ensuring predictability in production and reliability in use. ASME is an ANSI accredited standards developer. It was founded in 1800 by a small group of leading industrialists and has grown to include more than 130,000 members in 151 countries. 32,000 of the members are students. Standards from ASME are available both individually, directly through the ANSI webstore, and as part of a Standards Subscription. If you or your organization are interested in easy, managed, online access to standards that can be shared, a Standards Subscription may be what you need - please contact us at: or 1-212-642-4980 or Request Proposal Price.

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ASME B1.20.1-2013 (R2018)

Pipe Threads, General Purpose, Inch

ASME’s widely-referenced B1.20.1 Standard on Pipe Threads, General Purpose, Inch covers dimensions and gaging of the world’s most common pipe threads: NPT, NPSC, NPTR, NPSM, and NPSL. From critical applications demanding robustness and precision to common plumbing and hardware, these threads are used everywhere in the United States and abroad. This long awaited revision incorporates both subtle and substantive changes, including: Moving of the gaging point of reference of external threads in certain circumstances; A new acceptability section for instances of gaging disputes; A change to parameters, facilitating the calibration of working gages; Guidance for plated or coated pipe threads; Better explanatory language for the lay-user. This is the foundational Standard for NPT, NPSC, NPSM, and NPSL pipe threads. All companies that manufacture, sell, or use these threads should have this revision in their technical library.

ASME A17.1-2016

Safety Code for Elevators and Escalators

This Code is one of the numerous codes and standards developed and published by The American Society of Mechanical Engineers (ASME) under the general auspices of the American National Standards Institute, Inc. (ANSI).  The Code is intended to serve as the basis for the design construction, installation, operation, testing, inspection, maintenance, alteration, and repair of elevators, dumbwaiters, escalators, moving walks, and material lifts.  Safety codes and standards are intended to enhance public health and safety. Revisions result from committee consideration of factors such as technological advances, new data, and changing environmental and industry needs. Revisions do not imply that previous editions were inadequate.   This Code applies to new installations only, except Part 1, and Sections 5.10, 8.1, 8.6, 8.7, 8.8, 8.9, 8.10, and 8.11, which apply to both new and existing installations. Also, see ASME A17.3, Safety Code for Existing Elevators and Escalators, for further requirements.  The following conditions are not addressed in this Code: (a) assignment of the responsibility for compliance to any particular party.  (b) establishment of a frequency for periodic inspections and tests. See Nonmandatory Appendix N for recommended inspections and test intervals.  (c) assignment of responsibility for persons authorized to make and witness inspections and tests.

ASME B30.2-2016

Overhead and Gantry Cranes (Top Running Bridge, Single or Multiple Girder, Top Running Trolley Hoist)

B30.2 applies to the construction, installation, operation, inspection, and maintenance of hand-operated and power-driven overhead and gantry cranes that have a top-running single-girder or multiple-girder bridge, with one or more top-running trolley hoists used for vertical lifting and lowering of freely suspended, unguided loads consisting of equipment and materials. The requirements included in this Volume also apply to cranes having the same fundamental characteristics such as cantilever gantry cranes, semi-gantry cranes, and wall cranes. Requirements for a crane used for a special purpose such as, but not limited to, non-vertical lifting service, lifting a guided load, or lifting personnel are not included in this Volume.

ASME B30.9-2018


Volume B30.9 includes provisions that apply to the fabrication, attachment, use, inspection, testing, and maintenance of slings used for load handling purposes, used in conjunction with equipment described in other volumes of the B30 Standard, except as restricted in ASME B30.12 and ASME B30.23. Slings fabricated from alloy steel chain, wire rope, metal mesh, synthetic fiber rope, synthetic webbing, and polyester fiber yarns in a protective cover(s) are addressed. Careful application of B30 safety standards will help users to comply with applicable regulations within their jurisdictions, while achieving the operational and safety benefits to be gained from the many industry best-practices detailed in these volumes. Intended for manufacturers, owners, employers, users and others concerned with the specification, buying, maintenance, training and safe use of slings and hooks with B30 equipment, plus all potential governing entities.

ASME B30.20 / ASME BTH-1 - Below the Hook lifting Devices Package

ASME B30.20-2013 and ASME BTH-1-2017

The ASME B30.20 / ASME BTH-1 - Below the Hook lifting Devices Package provides the safety and design requirements for below the hook lifting devices. It is applicable to hoists, hooks, cableways, cranes, slings, derricks and jacks. ASME B30.20 / ASME BTH-1 - Below the Hook lifting Devices Package includes:

  • ASME B30.20-2018
  • ASME BTH-1-2017

ASME BTH-1-2017

Design of Below-the-Hook Lifting Devices

BTH-1 provides minimum structural and mechanical design and electrical component selection criteria for ASME B30.20 below-the-hook lifting devices. The provisions in this Standard apply to the design or modification of below-the-hook lifting devices. Compliance with requirements and criteria that may be unique to specialized industries and environments is outside of the scope of this Standard. Lifting devices designed to this Standard shall comply with ASME B30.20, Below-the-Hook Lifting Devices. B30.20 includes provisions that apply to the marking, construction, installation, inspection, testing, maintenance, and operation of below-the-hook lifting devices. BTH-1 addresses only design requirements. As such, this Standard should be used in conjunction with B30.20, which addresses safety requirements. BTH-1 does not replace B30.20. The design criteria set forth are minimum requirements that may be increased at the discretion of the lifting device manufacturer or a qualified person.

ASME B30.20-2018

Below-the-Hook Lifting Devices

Volume B30.20 includes provisions that apply to the marking, construction, installation, inspection, testing, maintenance, and operation of below-the-hook lifting devices, other than components addressed by other ASME B30 volumes or other standards, used for attaching loads to a hoist. The requirements in this Volume also apply to clamps used for positioning and anchoring.


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