ISO 898

Last updated

ISO 898 is an international standard that defines mechanical and physical properties for metric fasteners. This standard is the origin for other standards that define properties for similar metric fasteners, such as SAE J1199 and ASTM F568M. [1] It is divided into five (nonconsecutive) parts:

Contents

1. Bolts, screws and studs with specified property classes – Coarse thread and fine pitch thread [2]

2. Nuts with specified proof load values – Coarse thread [3]

3. Flat washers with specified property classes [4]

5. Set screws and similar threaded fasteners not under tensile stresses [5] [6]

6. (Now withdrawn) Nuts with specified proof load values – Fine pitch thread [7]

7. Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm [8]

With exception to part 7, which defines test standards, the parts of this standard define properties for fasteners made of carbon steel and alloy steel. The standards define that the testing must be performed at ambient temperatures, which is defined as between 10 and 35 °C (50 and 95 °F). The standards do not cover fasteners that would otherwise apply but require special properties, such as weldability or corrosion resistance. [2] [3] [5]

Part 1: Bolts, screws and studs with specified property classes – Coarse thread and fine pitch thread

Part 1 defines the mechanical properties of bolts, screws, and studs. It specifically applies to fasteners that have an ISO metric screw thread as defined in ISO 68-1. The properties are defined for M1.6-39 with coarse threads and M8-39 with fine threads. The diameter and pitch combinations must adhere to ISO 261 and ISO 262 and the thread tolerances must adhere to ISO 965 parts 1, 2, and 4. [2]

Part 1 does not specify properties for fasteners that have head geometries that reduce the shear strength of the fastener, such as low head screws and countersunk heads. It also excludes set screws, which are covered under part 5. [2]

Part 2: Nuts with specified proof load values – Coarse thread

Part 2 defines the mechanical properties for coarse threaded nuts up to an M39 size and a height of at least half the nominal diameter. [3]

Part 3: Flat washers with specified property classes

Part 3 defines the mechanical and physical properties of flat washers, designed to be used in bolted joints in combination with other fasteners. [4]

Part 5: Set screws and similar threaded fasteners not under tensile stresses

Part 5 defines the mechanical properties for set screws and other fasteners not under tensile stresses. It defines properties for sizes M1.6 through M24. [5]

Part 6: Nuts with specified proof load values – Fine pitch thread

Part 6 has been withdrawn as of 20212 and been replaced by ISO 898-2:2012. It used to be same as part 2 except for fine threaded nuts that range from M8 to M39. Note that the working temperature range for these fasteners is −50 to 300 °C (−58 to 572 °F) [7]

Part 7: Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm

Part 7 defines how to perform torsional tests on bolts and screws that have a nominal diameter less than or equal to 10 mm. This standard only applies to short screws and bolts with a nominal diameter between 3 and 10 mm. [8]

Related Research Articles

The Unified Thread Standard (UTS) defines a standard thread form and series—along with allowances, tolerances, and designations—for screw threads commonly used in the United States and Canada. It is the main standard for bolts, nuts, and a wide variety of other threaded fasteners used in these countries. It has the same 60° profile as the ISO metric screw thread, but the characteristic dimensions of each UTS thread were chosen as an inch fraction rather than a millimeter value. The UTS is currently controlled by ASME/ANSI in the United States.

<span class="mw-page-title-main">Bolted joint</span> Mechanical joint secured by a threaded fastener

A bolted joint is one of the most common elements in construction and machine design. It consists of a male threaded fastener that captures and joins other parts, secured with a matching female screw thread. There are two main types of bolted joint designs: tension joints and shear joints.

<span class="mw-page-title-main">Screw thread</span> Helical structure used to convert between rotational and linear movement or force

A screw thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. A screw thread is the essential feature of the screw as a simple machine and also as a threaded fastener.

British Standard Whitworth (BSW) is an imperial-unit-based screw thread standard, devised and specified by Joseph Whitworth in 1841 and later adopted as a British Standard. It was the world's first national screw thread standard, and is the basis for many other standards, such as BSF, BSP, BSCon, and BSCopper.

British Association screw threads, or BA screw threads, are a set of small screw threads, the largest being 0BA at 6 mm diameter. They were, and to some extent still are, used for miniature instruments and modelling.

<span class="mw-page-title-main">Taper pin</span> Fastener consisting of a steep conical rod which is forced into a hole

A taper pin is a fastener used in mechanical engineering. They are steel rods with one end having a slightly larger diameter than the other.

The ISO metric screw thread is the most commonly used type of general-purpose screw thread worldwide. They were one of the first international standards agreed when the International Organization for Standardization (ISO) was set up in 1947.

<span class="mw-page-title-main">Screw</span> Type of fastener characterized by a thread wrapped around a cylinder core

A screw is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to the head. Screws might be inserted into holes in assembled parts or a screw may form its own thread. The most common uses of screws are to hold objects together and there are many forms for a variety of materials.

<span class="mw-page-title-main">Nut (hardware)</span> Type of fastener with a threaded hole

A nut is a type of fastener with a threaded hole. Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together. The two partners are kept together by a combination of their threads' friction, a slight stretching of the bolt, and compression of the parts to be held together.

United States Standard thread, also known as Sellers Standard thread, Franklin Institute thread and American Standard thread, is a standard for inch based threaded fasteners and washers.

ASTM A325 is an ASTM International standard for heavy hex structural bolts, titled Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength. It defines mechanical properties for bolts that range from 1⁄2 to 1+1⁄2 inches in diameter.

ASTM F568M is an ASTM International standard for metric bolts, screws and studs that are used in general engineering applications. It is titled: Standard Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners. It defines mechanical properties for fasteners that range from M1.6 to 100 in diameter. The standard was withdrawn in 2012. and has been replaced by ISO 898-1

ASTM A354 is an ASTM International standard that defines chemical and mechanical properties for alloy steel bolts, screws, studs, and other externally threaded fasteners. It is officially titled: Standard Specification for Quenched and Tempered Alloy Steel Bolts, Studs, and Other Externally Threaded Fasteners.

<span class="mw-page-title-main">Threaded rod</span> Rod with ridges wrapped around it

A threaded rod, also known as a stud, is a relatively long rod that is threaded on both ends; the thread may extend along the complete length of the rod. They are designed to be used in tension. Threaded rod in bar stock form is often called all-thread (ATR); other names include fully-threaded rod, redi-rod, continuously-threaded rod, and TFL rod.

ISO 965 is an International Organization for Standardization (ISO) standard for metric screw thread tolerances. It specifies the basic profile for ISO general purpose metric screw threads (M) conforming to ISO 261.

<span class="mw-page-title-main">Bolt (fastener)</span> Threaded fastener with an external male thread requiring a matching female thread

A bolt is a form of threaded fastener with an external male thread requiring a matching pre-formed female thread such as a nut. Bolts are very closely related to screws.

The Industrial Fasteners Institute (IFI) is an American non-profit trade and standards organization and publisher, based in Independence, Ohio. It was founded as the American Institute of Bolt, Nut and Rivet Manufacturers in 1931 and changed its name to the IFI in 1949. Among their publications is the frequently cited IFI Fastener Technology Handbook, a reference frequently used as a design guide by mechanical engineers, machinists, and others involved in the production of high-quality machine screws, bolts, nuts, and other engineered fasteners.

<span class="mw-page-title-main">Wrench size</span>

Width across flats is the distance between two parallel surfaces on the head of a screw or bolt, or a nut, mostly for torque transmission by positive locking.

The Löwenherz thread is a largely obsolete metric thread form designed in the late nineteenth century and frequently applied in precision instruments. It is named after Dr. Leopold Löwenherz, who was the director of the metrology institute Physikalisch-Technische Bundesanstalt in Berlin.

<span class="mw-page-title-main">Preferred metric sizes</span> Metricated industry standards

Preferred metric sizes are a set of international standards and de facto standards that are designed to make using the metric system easier and simpler, especially in engineering and construction practices. One of the methods used to arrive at these preferred sizes is the use of preferred numbers and convenient numbers, such as the Renard series and 1-2-5 series, to limit the number of different sizes of components needed.

References

  1. ↑ Bickford & Nassar 1998 , p. 154.
  2. 1 2 3 4 ISO 898-1:2013 , retrieved 2023-11-28.
  3. 1 2 3 ISO 898-2:2022 , retrieved 2023-11-28.
  4. 1 2 ISO 898-3:2018 , retrieved 2023-11-28.
  5. 1 2 3 ISO 898-5 , retrieved 2009-06-12.
  6. ↑ ISO 898-5:2021 , retrieved 2023-11-28.
  7. 1 2 ISO 898-6:1994 , retrieved 2009-06-12.
  8. 1 2 ISO 898-7:1992 , retrieved 2023-11-28.

Bibliography

Further reading

This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.