ASME B18.29.1-2010 pdf download

ASME B18.29.1-2010 pdf download.Helical Coil Screw Thread Inserts— Free Running and Screw Locking (Inch Series).
1 INTRODUCTORY NOTES 1.1 Scope 1.1.1 This Standard delineates the dimensional data for the inch series helical coil screw thread inserts and the threaded holes into which they are installed. Both free-running and screw-locking types having uni- fied fine and unified coarse thread series from size #1 through 1 1 ⁄ 2 in. are covered. Appendices that describe insert selection, STI (screw thread insert) taps, gages and gaging, insert installation, and removal tooling are also included. 1.1.2 The inclusion of dimensional data in this Standard is not intended to imply that all products described are stock sizes. Consumers should consult with manufacturers concerning availability. 1.2 References The latest editions of the following documents form a part of this Standard to the extent specified herein. Army A-A-59158, Tools for Inserting and Extracting Helical Coil Wire Screw Thread Inserts Publisher: IHS Inc., 15 Inverness Way East, Englewood, CO 80112 (www.ihs.com) ASME B1.1, Unified Inch Screw Threads (UN and UNR Thread Form) ASME B1.2, Gages and Gaging for Unified Inch Screw Threads ASME B1.3, Screw Thread Gaging Systems for Acceptability — Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ) ASME B18.18.2, Inspection and Quality Assurance for High-Volume Machine Assembly Fasteners ASME B46.1, Surface Texture, Surface Roughness, Waviness, and Lay ASME B47.1, Gage Blanks ASME B94.9, Taps: Ground and Cut Threads ASME Y14.5M, Dimensioning and Tolerancing ASME Y14.36, Surface Texture Symbols
1.3 Description Helical coil inserts are screw thread bushings coiled from wire of diamond shaped cross-sections. The inserts are screwed into STI tapped holes to form nominal size internal threads. Inserts are installed by torquing through a diametral tang. This tang is notched for removal after installation. In the free state, the inserts are larger in diameter than the tapped hole into which they are installed. In the assembly operation, the torque applied to the tang reduces the diameter of the leading coil and permits it to enter the tapped thread. The remaining coils are reduced in diameter as they, in turn, are screwed into the tapped hole. When the torque or rotation is stopped, the coils expand with a spring-like action, anchoring the insert in place against the tapped hole.
4.2.1 Torque Test Bolts. Assembled screw-locking inserts shall be torque-tested with bolts in accordance with ASME B1.1, cadmium plated, or have other coating with a similar coefficient of friction and a hardness of 36 HRC to 44 HRC. The bolts selected for this test shall be of sufficient length so the thread run out does not enter the insert and that a minimum of one full thread extends past the end of the insert when the bolt is fully seated. Acceptability of bolt threads shall be determined based on System 22 of ASME B1.3 (see Note below). NOTE: Until a replacement for cadmium plating on the torque test bolts (as specified in para. 4.2.1) is found, and test data com- pleted, an alternate coating, lubricant, or both, can be used to perform the torque test (values may be different from those obtained using cad plated screws) based on agreement between the customer and the insert supplier. 4.2.2 Torque Test Block. The insert to be tested shall be installed in a Class 3B threaded hole conforming to Table 1 in a test block made from 2024-T4 (SAE AMS4120, ASTM B 209-02) aluminum alloy. After instal- lation, the tang shall be removed. The surface of the test block from which the insert is assembled shall be marked to indicate the radial location where the assembled insert begins.