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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
Publisher: American Society for Testing and Materials (ASTM International), 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428 (www.astm.org) SAE AMS4120, Aluminum Alloy, Rolled or Cold Finished Bars, Rods, and Wire, 4.4Cu–1.5Mg–0.60Mn (2024), Solution Heat Treated and Naturally Aged (T4), Solution Heat Treated, Cold Worked, and Naturally Aged (T351) SAE AS5272, Lubricant, Solid Film, Heat Cured, Corrosion Inhibiting Procurement Specification SAE AS8879, Screw Threads — UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter SAE J417, Hardness Tests and Hardness Number Conversions. Publisher: Society of Automotive Engineers (SAE International), 400 Commonwealth Drive, Warrendale, PA 15096-0001 (www.sae.org) 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.
1.4 Class of Fit Since helical coil inserts are flexible, the class of fit of the final assembly is a function of the size of the tapped hole. Helical coil STI taps are available for both tolerance Classes 2B and 3B tapped holes. Tolerance Class 2B tapped holes provide maximum production tolerances, but result in lower locking torques when screw locking inserts are used. The higher and more consistent torques given in Table 5 are met by the screw locking inserts when assembled and tested in tolerance Class 3B tapped holes in accordance with section 2. 1.5 Compatibility Assembled helical coil inserts will mate properly with items having UN external threads in accordance with ASME B1.1. In addition, due to the radius on the crest of the insert at the minor diameter, the assembled insert will mate with UNJ profile external threaded parts with controlled radius root threads per SAE AS8879. 1.6 Types of Inserts 1.6.1 Free-Running. The free-running insert pro- vides a smooth, hard, and free-running thread. 1.6.2 Screw-Locking. The screw-locking insert pro- vides a resilient locking thread produced by a series of chords on one or more of the insert coils. 2 STI TAPPED HOLE The tapped hole into which the insert is installed shall be in accordance with ASME B1.1, except that diameters are larger to accommodate the wire cross-section of the insert. Dimensions of the STI tapped holes are shown in Table 1 and calculated per Note (3) of Table 1.

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