ASME B18.16.6:2008 pdf free download

ASME B18.16.6:2008 pdf free download.Nylon Insert Locknuts(Inch Series).
ASME B18.16.6 covers the complete general, dimensional, mechanical, and performance data for carbon steel, inch series nylon insert locknuts of property grades NE2, NE5, and NE8 designated as American National Standard.
The inclusion of dimensionil datii in this Standard is not intended to imply that all of the locknut sizes in conjunction with the various options described herein are stock items. Consumers should consult with suppliers concerning lists of stock production nylon insert locknuts.
1.2 Comparison to ISO Standards
There is no ISO inch standard for these products at this time.
2 REFERENCE STANDARDS
The following is a list of publications referenced in this Standard. Unless otherwise specified, the reference standard(s) shall be the most recent issue at the time of order placement.
ASME B1.I, Unified Inch Screw Threads
ASME 131.3, Screw and Thread Gaging Systems for Dimensional Acceptability—Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ)
ASME B1W2.1, Square and Hex Bolts and Screws (Inch Series)
ASME B18.12, Glossary of Terms for Mechanical Fasteners
ASME BI81&1, Inspection and Quality Assurance for General Purpose Fasteners
ASME 818.18.2M, Inspection and Quality Assurance for High-Volume Machine Assembly Fasteners
ASME B1822.1, Plain Washers
Publisher: The American Society of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, P.O. Box 2300, Fairfield, NJ 07007-2300
ASTM B 117, Standard Practice for Operating Salt Spray (Fog) Apparatus
ASTM E 18, Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
or 3 is developed in the bolt or mandrel. The hardened washer shall be prevented from turning during nut tightening. The nut shall then be backed off by the application of reverse torque until the tensile load in the bolt or mandrel has been reduced to zero. The lowest numerical torque occurring while the nut is being backed off throughout the next 360 deg of rotation shall be recorded as the minimum first removal torque. This minimum torque shall not be less than the first removal prevailing- torque value as specified in Table 2 or 3. The nut shall then be backed oil until the prevailing-torque element is disengaged from the bolt or mandrel thread. The nut shall be reassembled and removed four more times. On each reassembly, the nut shall be assembled to the initial first removal position but no clamp load shall be induced in the bolt The test washer shall not be removed during these additional cycles.
At no time during the four additional installations and removals should the prevailing-torque exceed the maximum, first install prevailing-torque value as sped- tied for the applicable grade and thread series in Table 2 or 3. During the fifth removal, the minimum torque occurring while the nut is being backed off throughout the first 360 deg of rotation shall be recorded. The minimum torque shall not be less than the fifth removal value as specified in Table 2 or 3. Sufficient time shall elapse between torquing cycles to prevent overheating of the test assembly.
The speed of installation and removal of the nut shall not exceed 30 rpm and shall be continuous and uniform.
12.3.1 Torque-MeasurIng Device. The torque- measuring device shall be capable of measuring the torque while the test nut is in motion. Test results may be recorded by an analog or digital device that is capable of forming a permanent record. The measuring system shall have a measurement uncertainty at the point of measurement of ±2%. Test equipment may be handheld or electronic, provided that accuracy and speed restrictions as noted above are observed. A manual wrench and manual recording device may be used if it meets the above calibration criteria.
12.3.2 Load-MeasurIng Device. The load-measuring device used in the prevailing-torque test shall be an instrument capable of measuring the actual tension induced in the test bolt as the nut is tightened. The device shall be accurate within ±5% of the test clamp load being used, The bolt clearance hole in the backing plate behind the washer shall have the same diameter and tolerance as the test washer.