HELICAL COIL SCREW THREAD INSERTS Machinery's Handbook, 31st Edition
1749
Locking Feature (Note (1)] (locking inserts only)
To Be Measured 30° from Tang
100° max.
A
P
B
K
First Coil Diam. to Meet Free Diam. 210° from Tang within 20°
K
U
C
[Note (2)]
Ends of Coil May Be Square or Angular
Tang
V
Number of Free Coils
Tang Radius
Free outer diam.
Notch to be on Top Face of First Coil Beyond Tangent Point of Tang Radius
0.8
S min.
Gage = Pitch/2
F 2
F max. 2
Min. Metal Condition
Min. Metal Condition
60°
D min.
D max.
D max.
D min.
A min. flat
H min.
D max.
+
D max. 2
D min. 2
R min. Tangent to Flanks
H max. 2
S min.
See View L
Enlarged View L Typ 2 Places
E max. 2 E min. 2
A min. flat
See View L
E min.
CL of Wire Section
E max.
0.09 DG
Section K-K
Fig. 2. Insert Configuration
General Notes for Fig. 2 : (a) Assembled length of insert to be measured from notch. (b) Dimensions apply before supplementary coating (see Table 3 and Table 4 ). (c) Surface texture; symbols per ASME Y14.35, requirements per ANSI/ASME B46.1. (d) Dimensions and tolerancing; ASME Y14.5. Notes: (1) Number of locking coils, spacing of locking coils, number of locking deformations, shape and orientation optional locking feature for 1, 1.5, and 2 diam. length inserts symmetrically positioned about the center of insert, and for 2.5 and 3 diam. length inserts at 1 diam. from tang end of insert. (2) Number of free coils to be counted from notch. Inspection and Quality Assurance The inspection of inserts shall be in accordance with ANSI/ASME B18.18, with inspec- tion level 3 for the 15 cycle torque test. Inspection (Nondestructive).— Inserts shall be visually examined for conformance with drawings and workmanship requirements in accordance with ANSI/ASME B18.18. Threads: The inserts, when assembled in STI threaded holes conforming to Table 1, shall form threads conforming to ANSI/ASME B1.13M tolerance class 4H5H or 5H except for the locking feature of screw-locking inserts. The assembled insert, both types, shall accept and function with parts having external MJ threads per ANSI/ASME B1.21M.
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