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).
1.4 Class of Fit
Since helical coil inserts are flcible, the class of fit of the final assembly k a function of the si,i’ of the tapped bolt’. Helical coil STI taps are available for both tolerance Classes 2K and 3K tapped holes. Tolerance Class 213 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 assemhk’d and tested in tolerance Class lB tapped hok in accordance with sechon 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 AS$$79
1.6 Types of Inserts
1.6.1 FreeRunning. 11w free-running insert provides a smooth. hard, and free-running thread.
1.6.2 Screw-lockIng. The screw-locking insert provides a resilient locking thread produced by a series of chords on oiw or more of the insert coils.
2 STI TAPPED HOLE
11w tapped hole into which the insert is installed shall be Ifl accordance with ASME B1.1, except that diameters are larger to accommodate the wire cross-section of the in.sert. imensions of the STI tapped holes are shown in Table I and calculated per Note (3) of Table I.
2.1 Screw Thread Designation
2.1.1 Desagnaton for Tapped Hole. 11w drawing note for the STI threaded hole per Table 1 to accept the helical coil insert shall be in accordance with the following example:
[XAMrLL “-2O UNC-2 Sf1 thr’id 0430 mm. depth, per ASME B18291.
2.1.2 Designation for a Helical Coil Insert l*signalion of the helical coil insert on parts lists, spares lists, purchase orders, etc., shall be in accordance with the following eampk’s
EXAM1 IS
(1) ASMl 1291, 4-20 UNC 0.373 long helical c4d free-ru NMfl
(2) ASMI H18.29 1. #10-32 UNF 03S0 long helwal coal scrrw.kcking iruert
2.1.3 Designation for 511 Threaded Hole Including Installed Helical Coil Insert.
2.2 Gages and Gaging
Acceptanie of the threaded hole is determined by gaging with STI GO. 4OT GO (HI). and plain cylindrical gages designed and applied in accordance with System 21 of ASME B1.3 (see Nonmandatory Appendix C).
3 HELICAL COIL INSERT
3.1 Insert Material
Chemical composition of the inserts is austenitic corrosion resistant (stainless) steel within the limits of Table 2.
3.2 Properties
3.2.1 Tensile Strength Wire, before coiling into inserts, shall have tensile strength not lower than 150,0(10 psi, determined in accordance with 14S[M A 370.
3.2.2 Bendir. Wire shall withstand, without crackmg bending in accordance with ASTM E 290 at room temperature through an angle of ISO deg around a diameter equal to twice the cross-sectional dimension of the wire in the plane of the bend.
3.2.3 Workmanship. [he formed wire shall Lie of uniform quality and temper; smooth, clean, free from kinks, waviness, splits, cracks, laps, seams, scale, segregation. and other defects that may impair the scrviceabilitv of the insert.
3.3 Coatings
3.3.1 Red Dye ldentlbcat.on. Screw-locking inserts are dyed red for identification. The red dye may completely or partially cover the insert. However, it must be sufficient to identify the insert when it is installed in the tapped hole.
3.3.2 Dry Film Lubricant Coating. When specified, dry him lubricant coating can be applied to helical cod inserts. It shall meet the requirements of para. 33.2.1 and para. 3.3.12. Color of dry film luhñcated insert is dark gray to black,
3.3.2.1 Dry Film Materia[ The lubricant shall meet the requirements of SAE AS5272. Type I.
3.3.2.2 Thickness. The coating shall be uniformly deposited on the insert with minimum thickness being complete coverage The maximum thickness shall be the avoidance of ‘bridging” tween coils.
