ASME B18.16.4-2008 pdf free download.Serrated Hex Flange Locknuts 90,000 psi (Inch Series).
ASTM F 2328, Standard Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws, and Studs
5 DIMENSIONS
(a) Unless otherwise specified, nil dinwnsions in this Standard shall be as specified in Tables 1 and 2, and sections 6 through 9. All dimensions in this Standard are in inches and apply before plating or coating Lx specified. When a plating or coating is specified, the finished product dimensions shall be agreed upon between the supplier and purchaser.
(b) Symbols specifying geometric characteristics art in accordance with ASME Y14.5M.
6 SERRATIONS
The configuration of the serrations shall be at the discretion of the manufacturer. presided the performance requirements as specified in para. )22 are met
7 TOPS OF NUTS
Tops of nuts shall be flat and chamfered. The length of chamfer at hex corners shall be from 5% to l5. of the basic thread size. The surface may be slightly convex or rounded.
8 TRUE POSITION OF HEXAGON TO TAPPED HOLE
At maximum material condition MMC). the axis ol the hexagon shall be located at true position with respect to the axis of the thread pitch dianwter within a tolerance zone having a diameter equivalent to 4’ of the maximum width acrnss fiats.
9 COUNTERSINK
Tapped hole shall be countersunk on the bearing face and may be countersunk on the top. Thy maximum countersink diameter shall be the thread basic (nominal) major diameter plus 0.030 in. for in. nominal size nuts and smaller, and l.Otl times the basic major diameter for nuts larger than % in. No part of the threaded portion shall project beyond the bearing surface.
10 THREADS
Threads shall be Unified coarse or fine thread series (UNC or UNF series) Class 2B, in accordance with ASME B1.1.
Inspection shall be based on System 21 of ASME B1.3.
11 MATERIAL AND HARDNESS
Unless otherwise specified, nuts shall be manufactured from carbon steel in accordance with ASTM F 2282.
The nuts shall have a case hardness of HR 15N 78-90 on the surface of the nut in accordance with
ASTM F 2328. For referee purposes, case hardness shall be measured in the serrations.
That value is the “break loose torque.’ A different unused test bolt, test nut, and hole in the test strip must be used for every test. The test bolt shall be prevented from turning during testing. Additional lubricant shall not be added.
(ii) The test bolt shall be plain finished with threads conforming to Class 2A tolerances as specified in ASME 131.1. The boll shall have an ultimate ienile strength not less than the specified proof load of the nut to be tested. Bolt length shall be such that a minimum length equivalent to six thread pitches as measured froni the end of the bolt will protrude through the nut when the nut is seated.
(C) The steel strip must be a minimum of 0.060 in. thick, having a hardness between lOUt 60 and
I IRK 90. The strip must have holes for placing the bolt through that are 0.010 in. to 0.025 in. over the bolt’s nominal thread diameter,
(d) Torque Measuring Device. Test results may be measured by an analog or digital device that is capable of indicating and holding a peak torque value. The analog or electronic measuring system shall have a certified accuracy of ± 2% or
13 FINISH
Unless otherwise specified. nuts shall be furnished with an eledrodeposited zinc-plated finish in accordance with ASTM F 1941, Fe/Zn 3A,
14 GRADE AND IDENTIFICATiON MARKING
Unless otherwise specified by the purchaser. these nuts shall have no grade marking ruquirements Nuts.