ASME B18.6.2-2020 pdf download

ASME B18.6.2-2020 pdf download.Square Head Set Screws and Slotted Headless Set Screws (Inch Series).
The following is a list ofpublications referenced in this Standard. Unless otherwise specified, the latest edition shall be used. ASME B1.1,UnifiedInchScrewThreads(UN,UNR,andUNJ Thread Forms) ASME B1.3, Screw Thread Gaging Systems for Accept- ability: Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ) ASME B18.12, GlossaryofTerms forMechanicalFasteners ASME B18.18, Quality Assurance for Fasteners ASME B18.24,PartIdentifyingNumber(PIN) CodeSystem Standard for B18 Fastener Products Publisher: The American Society ofMechanical Engineers (ASME), Two Park Avenue, New York, NY 10016-5990 (www.asme.org) ASTM A380/A380M, Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems ASTM F1941/F1941M, Standard SpecificationforElectro- deposited Coatings on Mechanical Fasteners, Inch and Metric Publisher: American Society for Testing and Materials (ASTM International), 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959 (www.astm.org) 1.7 Part Identifying Number For a Part Identifying Number, refer to ASME B18.24. 2 GENERALDATAFORSQUAREHEADSETSCREWS 2.1 Heads 2.1.1 Head Height. The head height is measured, parallel to the axis of the screw, from the top of the head to the intersection of the side of the head with the undersurface. 2.1.2 Width Across Flats. The maximum width across flats shall not be exceeded. However, on milled-from-bar, nonferrous screws, the maximum limit may conform to commercial tolerances of the bar stock material.Head True Position. The axis ofthe head shall be located at true position within a tolerance zone having a diameter equal to 6% of the specified maximum width across flats of the head, relative to the axis of the screw shank, regardless of feature size. For referee purposes, the evaluation shall be made by holding the body in a collet or chuck one bolt diameter from under the head and rotating the part.inlinewiththeaxisoftheboltorscrew,findandrecordthe lowestpointon each flatorthe highestpointon each lobe.
The length of square head set screws shall be measured parallel to the axis of the screw from the intersection of the side of the head with the undersurface to the extreme point. 2.2.2 Length Tolerance. The length tolerance for square head setscrews shall be as shown in Table 2.2.2-1. 2.3 Threads 2.3.1 Thread Series and Class. The threads on square head set screws shall be Unified Inch coarse, fine, or 8- thread series, Class 2A, in accordance with ASME B1.1. For threads with additive finish, the size limits of Class 2A apply before coating, and the thread after coating is subject to acceptance using a basic Class 3A size GO thread gage and a Class 2A thread gage for either minimum material or NO GO. 2.3.2 Thread Gaging. Unless otherwise specified, dimensional acceptabilityofscrewthreads shall be deter- mined based on System 21, ASME B1.3. Thread Series and Class. The threads on slotted headless setscrews shall be Unified Inch coarse, fine, or8- thread series, Class 2A in accordance with ASME B1.1. For threads with additive finish, the size limits of Class 2A apply before coating, and the thread after coating is subject to acceptance using a basic Class 3A size GO thread gage and a Class 2A thread gage for either minimum material or NO GO. 3.3.2 Thread Gaging. Unless otherwise specified, dimensional acceptabilityofscrewthreads shall be deter- mined based on System 21, ASME B1.3. 3.4 Thread Length Slotted headless set screws shall have complete (full- form) threads extending over the portion of the screw length that is not affected by the point or the crown on the headless end. Threads through angular or crowned portions of length shall have fully formed roots with partial crests. 3.5 Points 3.5.1 Point Types. Unless otherwise specified, slotted headless set screws shall be supplied with cup points. When specified by the purchaser, screws shall have cone,dog,half-dog,flat,orovalpointsconformingtospeci- fications in Table 3.1.1-1. 3.5.2 PointAngles. The external pointangles specified shall apply only to the portions ofthe point that lie below the thread root diameter, as angles within the thread profile may vary due to manufacturing processes.