ASME SA-194:2019 pdf download

ASME SA-194:2019 pdf download.Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both
1. Scope
1.1 This specification covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1 ⁄ 4 through 4 in. and metric M6 through M100 nominal. It also covers austenitic stainless steel nuts in the size range 1 ⁄ 4 in. and M6 nominal and above. These nuts are intended for high-pressure or high-temperature service, or both. Grade substitutions with- out the purchaser’s permission are not allowed. 1.2 Bars from which the nuts are made shall be hot-wrought. The material may be further processed by centerless grinding or by cold drawing. Austenitic stainless steel may be solution annealed or annealed and strain-hardened. When annealed and strain hardened austenitic stainless steel is ordered in accor- dance with Supplementary Requirement S1, the purchaser should take special care to ensure that 8.2.2, Supplementary Requirement S1, and Appendix X1 are thoroughly understood. 1.3 Supplementary requirements of an optional nature are provided. These shall apply only when specified in the inquiry, contract, and order. 1.4 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable“ M” specification designation (SI units), the mate- rial shall be furnished to inch-pound units. 1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Within the text, the SI units are shown in brackets.
3. Terminology
3.1 Definitions ofTerms Specific to This Standard: 3.1.1 Austenitic Grades—All grades with a prefix of “8” or “9.” 3.1.2 Ferritic Grades—Grades 1, 2, 2H, 2HM, 3, 4, 6, 6F, 7, 7M, and 16. 3.1.3 Lot—Unless otherwise specified (see Discussion below), a lot is the quantity ofnuts ofa single nominal size and grade produced by the same manufacturing process. 3.1.3.1 Discussion—When Supplementary Requirement S5 is invoked on the purchase order, the following definitions of a lot shall apply: 3.1.3.2 For Grade 8 Nuts—The quantity of all the nuts of a single nominal diameter and grade made from the same heat of steel and made by the same manufacturing process. 3.1.3.3 For All Other Grade Nuts— (see 8.2 and 8.1.2.1)—All the nuts of a single nominal diameter and grade made from the same heat number and heat treated in the same batch if batch-type heat treating equipment is used or heat treated in the same continuous run of not more than 8 h under the same conditions if continuous-type heat treating equipment is used. 3.1.4 Type 3.1.4.1 For Grade 8 Nuts—Variations within the grade designated by a letter and differentiated by chemistry and by manufacturing process. 3.1.4.2 For Grade 6 Nuts—Variations within the grade designated by the letter F as differentiated by chemical addi- tions made for machineability. 3.1.5 Series—The dimensional relationship and geometry of the nuts as described in ASME B 18.2.2 or B 18.2.4.6M.
4. Ordering Information
4.1 The inquiry and order for material under this specifica- tion shall include the following as required to describe the material adequately: 4.1.1 Specification designation, year date, and grade, issue date and revision letter, 4.1.2 Quantity, number of pieces, 4.1.3 Dimensions (see Section 9), 4.1.4 Options in accordance with 8.2.2.1, 9.1, 9.2, 10.3, and 12, and 4.1.5 Supplementary Requirements, if any.4.2 Coatings—Coatings are prohibited unless specified by the purchaser (see Supplementary Requirements S7 and S8). When coated nuts are ordered, the purchaser should take special care to ensure that Appendix X2 is thoroughly under- stood. 4.3 See Supplementary Requirement S3 for nuts to be used in low temperature applications (Specification A320/A320M). 4.4 Proof Load Testing—See Supplementary Requirement S9 for proof load testing of nuts manufactured to dimensions and configurations other than those covered in Tables 3 and 4.