ASME B18.16.4 pdf download.Serrated Hex Flange Locknuts 90,000 psi (Inch Series).
5 DIMENSIONS
(a) Unless otherwise specified. all dimensions in this Standard shall be as specified in Tables I and 2, and sections 6 through 9. All dimensions in this Standard are in inches and apply before plating or coating is specified. When a plating or coating is specified, the finished product dimensions shall be agreed upon between the supplier and purchaser.
(1) Symbols specifying geometric characteristics are in accordance with ASME Y14.5M.
6 SERRATIONS
The configuration of the serrations shall be at the discretion of the manufacturer, provided the performance requirements as specified in para. 12.2 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 15% 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 of the hexagon shall be located at true position with respect to the axis of the thread pitch diameter within a tolerance zone having a diameter equivalent to 4’ of the maximum width across flats.
9 COUNTERSINK
Tapped hole shall be countersunk on the bearing face and may be countersunk on the top. The maximum countersink diameter shall be the thread basic (nominal) major diameter plus 0.030 in. for 34 in. nominal size nuts and smaller, and 1.08 times the basic major diameter for torque value. 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.
(b) Test Bolt. The test bolt shall be plain finished with threads conforming to Class 2A tolerances as specified in ASME Bl.l. The bolt shall have an ultimate tensile 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 from the end of the bolt will protrude through the nut when the nut is seated.
(c) Test Strip. The steel strip must be a minimwn of 0.060 in. thick, having a hardness between HRB 60 and l-IRB 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 Det’icr. 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 less,
13 FINISH
Unless otherwise specified, nuts shall be furnished with an electrodeposited 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 requirements.
ASME B18.16.4 pdf download
