How to Download ANSI H35.2 PDF: A Guide to Aluminum Alloy Dimensional Tolerances
Introduction
Aluminum is a versatile and abundant metal that is widely used in various industries and applications, such as aerospace, automotive, marine, construction, electrical, and household products. Aluminum products come in different shapes and sizes, such as sheets, plates, bars, tubes, wires, foils, and castings. To ensure the quality and performance of these products, they need to meet certain dimensional tolerances that specify the allowable variations in their dimensions.
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One of the most widely accepted standards for dimensional tolerances for aluminum mill products is ANSI H35.2, which is developed and published by the Aluminum Association. This standard covers the tolerances for sheet and plate, fin stock, foil, wire, rod and bar, tube and pipe, forgings, forging stock, and electrical conductors. It also provides definitions and illustrations for various terms and concepts related to aluminum products.
If you are interested in learning more about ANSI H35.2 standard and how to download it as a PDF file online, this article is for you. In this article, you will learn:
What is ANSI H35.2 standard and what does it contain?
Why is ANSI H35.2 important for aluminum products and their users?
How to get ANSI H35.2 PDF online from different sources?
What are the main types of aluminum alloy designations and how are they related to ANSI H35.2?
What are the main types of aluminum alloy dimensional tolerances and how are they presented in ANSI H35.2?
Main Body
Overview of aluminum alloy designations
Before we dive into the details of ANSI H35.2 standard, let's first understand the basics of aluminum alloy designations. Aluminum alloys are classified into different groups based on their chemical composition and temper (or heat treatment). Each group has a specific designation system that identifies the alloy by a numerical code or a name.
There are four major designation systems for aluminum alloys around the world:
ANSI/AA system
This is the most popular system in North America and it is managed by the Aluminum Association (AA). It uses a four-digit number to identify the alloy group and its main alloying element(s). For example, 1000 series alloys are essentially pure aluminum (99% or more), 2000 series alloys contain copper as the main alloying element, 3000 series alloys contain manganese, and so on.
The first digit indicates the major alloying element(s), the second digit indicates modifications of the original alloy or impurity limits, and the third and fourth digits identify specific alloys in each group.
The temper of the alloy is indicated by a letter followed by one or more digits. For example, T6 means solution heat-treated and artificially aged.
UNS system
This is a designation system for metals and alloys that is widely accepted in North America. It stands for Unified Numbering System and it is developed by ASTM International and SAE International. It uses a letter followed by five digits to identify an alloy.
The letter indicates the metal family (A for aluminum), the first digit indicates the alloy group (similar to ANSI/AA system), and the last four digits identify specific alloys in each group.
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The temper of the alloy is indicated by a suffix after a hyphen. For example, A92024-T351 means 2024-T351 aluminum alloy ISO system
This is a designation system for metals and alloys that is widely accepted internationally. It is developed by the International Organization for Standardization (ISO). It uses the letters Al as prefix, followed by the chemical composition of the alloy. For example, Al99.5 means an aluminum alloy with 99.5% aluminum content.
The temper of the alloy is indicated by a suffix after a hyphen. For example, Al99.5-H14 means an aluminum alloy with 99.5% aluminum content and strain-hardened and partially annealed temper.
Overview of aluminum alloy dimensional tolerances
Now that we have a basic understanding of aluminum alloy designations, let's move on to the main topic of this article: ANSI H35.2 standard and how to download it as a PDF file online.
ANSI H35.2 standard is an American national standard that specifies the dimensional tolerances for aluminum mill products, such as sheet and plate, fin stock, foil, wire, rod and bar, tube and pipe, forgings, forging stock, and electrical conductors. It also provides definitions and illustrations for various terms and concepts related to aluminum products.
Dimensional tolerances are the allowable variations in the dimensions of a product, such as thickness, width, length, diameter, straightness, flatness, squareness, roundness, etc. They are important for ensuring the quality and performance of the product, as well as for facilitating its fabrication and assembly.
ANSI H35.2 standard covers two main types of aluminum alloy dimensional tolerances: wrought alloys and cast alloys.
Wrought alloys
Wrought alloys are those that are subjected to hot and/or cold working processes, such as rolling, extruding, forging, and drawing. They have higher strength and ductility than cast alloys.
ANSI H35.2 standard provides tables of standard tolerances for various wrought alloy products in different tempers. The tables are organized by product form (sheet and plate, fin stock, foil, etc.), product type (coiled or flat sheet and plate, rectangular or round wire rod and bar, etc.), product size (thickness range or diameter range), and product condition (temper). The tables also indicate the applicable units (inch-pound or metric) and the method of measurement (caliper or micrometer).
The standard tolerances are expressed as plus or minus values from a specified nominal dimension. For example, the standard tolerance for 0.032 inch thick sheet in 3003-H14 temper is 0.002 inch. This means that the actual thickness of the sheet can vary from 0.030 inch to 0.034 inch.
Cast alloys
Cast alloys are those that are produced by pouring molten metal into molds or dies. They have lower strength and ductility than wrought alloys, but they can have more complex shapes and lower production costs.
ANSI H35.2 standard provides tables of standard tolerances for various cast alloy products in different tempers. The tables are organized by product form (sand castings, permanent mold castings, die castings), product type (plate or bar), product size (thickness range or width range), and product condition (temper). The tables also indicate the applicable units (inch-pound or metric) and the method of measurement (caliper or micrometer).
The standard tolerances are expressed as plus or minus values from a specified nominal dimension. For example, the standard tolerance for 1 inch thick plate in A356-T6 temper is 0.030 inch. This means that the actual thickness of the plate can vary from 0.970 inch to 1.030 inch.
Examples of tolerance tables
To give you a better idea of how ANSI H35.2 standard presents the dimensional tolerances for aluminum mill products, here are some examples of tolerance tables from the standard:
Table 12.2 Standard Tolerances for Round Tube [Metric]
Alloy
Temper
Outside Diameter Tolerance
Wall Thickness Tolerance
mm
%
mm
%
1xxx3xxx5xxx6xxx7xxx
OH112FT1T4T42T4510T451
0.15
0.5
0.10
10.0
H12H14H16H18H19H22H24H26H28H32H34H36H38
0.10
0.3
0.08
8.0
T5T52T6T62T6511T6510
0.10
0.3
0.08
8.0
Note: For outside diameters over 200 mm, add 0.10 mm to the tolerance.
Source: ANSI H35.2-2017
Table 15.1 Standard Tolerances for Sand Castings [Inch-Pound]
Alloy Group and Temper Designation
Thickness Tolerance, in.
Up to 1/4 in.
Over 1/4 to 1/2 in.
Over 1/2 in.
A356-T6, A357-T6, A201-T7, A206-T7, A242-T7, A356-T71, A357-T71, A201-T72, A206-T72, A242-T72, A356-T73, A357-T73, A201-T74, A206-T74, A242-T74, A356-T77, A357-T77, A201-T78, A206-T78, A242-T78.
+/- 0.030
+/- 0.045
+/- 0.060
All other alloys and tempers.
+/- 0.045
+/- 0.060
+/- 0.075
Source: ANSI H35.2-2017
Conclusion
In this article, we have learned how to download ANSI H35.2 PDF online and what it contains. We have also learned the basics of aluminum alloy designations and dimensional tolerances.
To summarize, here are the main points we have covered:
ANSI H35.2 standard is an American national standard that specifies the dimensional tolerances for aluminum mill products.
ANSI H35.2 standard is important for ensuring the quality and performance of aluminum products and their users.
ANSI H35.2 PDF can be obtained online from different sources, such as the Aluminum Association website, ANSI webstore, or other online platforms.
Aluminum alloys are classified into different groups based on their chemical composition and temper, and each group has a specific designation system that identifies the alloy by a numerical code or a name.
Aluminum alloy dimensional tolerances are the allowable variations in the dimensions of a product, and they are expressed as plus or minus values from a specified nominal dimension.
ANSI H35.2 standard covers two main types of aluminum alloy dimensional tolerances: wrought alloys and cast alloys.
ANSI H35.2 standard provides tables of standard tolerances for various aluminum alloy products in different tempers, units, and methods of measurement.
If you want to learn more about ANSI H35.2 standard and aluminum alloy dimensional tolerances, we recommend you to read the following sources:
The Aluminum Association website:
The Aluminum Association Standards and Data book:
The International Organization for Standardization website:
The Unified Numbering System for Metals and Alloys book:
The ANSI H35.2- standard:
We hope you have enjoyed reading this article and found it useful. If you have any questions or feedback, please feel free to leave a comment below. Thank you for your attention and have a great day!
FAQs
Here are some frequently asked questions and answers about ANSI H35.2 standard and aluminum alloy dimensional tolerances:
What is the difference between ANSI H35.2 and ASTM B209 standards?
ANSI H35.2 and ASTM B209 are both standards that specify the dimensional tolerances for aluminum mill products, but they have some differences in scope, content, and format. ANSI H35.2 is developed and published by the Aluminum Association, while ASTM B209 is developed and published by ASTM International. ANSI H35.2 covers a wider range of aluminum products, such as fin stock, foil, wire, rod and bar, tube and pipe, forgings, forging stock, and electrical conductors, while ASTM B209 mainly covers sheet and plate products. ANSI H35.2 provides tables of standard tolerances for different product forms, types, sizes, conditions, units, and methods of measurement, while ASTM B209 provides general rules and formulas for calculating the tolerances for sheet and plate products.
How can I convert the inch-pound units to metric units in ANSI H35.2 standard?
ANSI H35.2 standard provides both inch-pound and metric units for most of the product forms, except for some products that are only available in inch-pound units, such as electrical conductors. To convert the inch-pound units to metric units, you can use the following conversion factors:
1 inch = 25.4 mm
1 pound = 0.4536 kg
1 psi = 6.895 kPa
You can also use online converters or calculators to perform the conversion.
How can I check the compliance of my aluminum product with ANSI H35.2 standard?
To check the compliance of your aluminum product with ANSI H35.2 standard, you need to measure the actual dimensions of your product using the appropriate instruments and methods specified in the standard, such as calipers or micrometers. Then, you need to compare the actual dimensions with the nominal dimensions and the standard tolerances given in the tables of the standard for your product form, type, size, condition, unit, and method of measurement. If the actual dimensions fall within the range of the nominal dimensions plus or minus the standard tolerances, your product is compliant with ANSI H35.2 standard.
What are some benefits of using ANSI H35.2 standard for aluminum products?
Some benefits of using ANSI H35.2 standard for aluminum products are:
It ensures the quality and performance of aluminum products by providing uniform and consistent dimensional tolerances.
It facilitates the fabrication and assembly of aluminum products by reducing the errors and variations in their dimensions.
It enhances the communication and cooperation between aluminum producers and users by providing a common language and reference for dimensional tolerances.
It promotes the trade and exchange of aluminum products by providing an internationally recognized and accepted standard for dimensional tolerances.
Where can I find more information about ANSI H35.2 standard and aluminum alloy dimensional tolerances?
You can find more information about ANSI H35.2 standard and aluminum alloy dimensional tolerances from the following sources:
The Aluminum Association website:
The Aluminum Association Standards and Data book:
The International Organization for Standardization website:
The Unified Numbering System for Metals and Alloys book:
The ANSI H35.2 standard:
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