Machinery's Handbook, 31st Edition
Fasteners for Structural Applications 1711 verifiable in-process inspection is used in accordance with ANSI/ASME B18.18-2017, the final inspection level sample sizes of these respective standards shall apply. Compressible Washer-type Direct Tension Indicators.— Dimensions: The dimensions for the two washer types of direct tension indicators, Type A 325 and A 490, shall be in accordance with Table 9. Finish: Unless otherwise specified, direct tension indicators shall be supplied with a plain (as-processed) finish, tinplated, or uncoated. If zinc coatings are required, they shall be in accordance with ASTM F 959. Materials and Performance: Direct tension indicators shall conform to the requirements of ASTM F 959. Workmanship: The workmanship shall be smooth and free of burrs, laps, seams, excess mill scale, and foreign material on bearing surfaces or in protrusion welds, or other defects which would make them unsuitable for intended application. Designation: Compressible washer-type direct tension indicators shall be designated by the following data in the sequence shown: product name, nominal size (fractional or decimal equivalent), type (325 or 490), finish (plain, zinc, or epoxy). See example below: Example: DTI, 1 ∕ 2 Type 325, Plain Finish Identification Symbols: Grade and source marking and symbols shall conform to the requirements of ASTM F 959. Lot Number: Each direct tension indicator shall be marked with a lot number in accor dance with ASTM F 959. Quality Assurance: Unless otherwise specified, products shall be furnished in accor dance with ANSI/ASME B18.18 as noted in Dimensional Characteristics . Dimensional Characteristics: Direct tension indicators shall conform to the dimensions indicated in Table 9 . The designated characteristics defined in Table 9 , Note (1) shall be inspected in accordance with ANSI/ASME B18.18. For nondesignated characteristics, the provisions of ANSI/ASME B18.18 shall apply. Should a nondesignated dimension be determined to have a variance, it shall be deemed conforming to this Standard if the user, who is the installer, accepts the variance based on fit, form, and function considerations. Where verifiable in-process inspection is used in accordance with ANSI/ASME B18.18- 2017, the final inspection level sample sizes of these respective standards shall apply.
A B C
Fig. 3. Compressible Washer Dimensions
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