This standard specifies the type and size of the test die for testing the straightness of bolts, screws and other screws. This standard applies to item 17 in Table 3 of ZB J13 002.1. JB/T 7384.12-1994 Fastener Screw Straightness Test Die JB/T7384.12-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7384.1~7384.18-94
Special Inspection Fixtures for Fasteners
Published on July 26, 1994
Ministry of Machinery Industry of the People's Republic of China
Implemented on July 1, 1995
Mechanical Industry Standard of the People's Republic of China
Fasteners
Screw Straightness Inspection Die
1. Subject Content and Scope of Application
This standard specifies the type and size of the screw straightness inspection die for detecting bolts, screws, etc. This standard applies to item 17 in Table 3 of ZBJ13002.1. 2 Reference standards
GB1957bZxz.net
ZBJ13002.1
General thread tolerances and fits (1~355mm) Smooth limit gauges
Fastener tolerances Bolts, screws and nuts
JB/T7384.1294
Fastener test methods Dimensions and geometric accuracy of bolts, screws, studs and nuts The type of screw straightness inspection die is shown in Figure 1. ×45*
Approved by the Ministry of Machinery Industry on July 26, 1994
Implemented on July 1, 1995
4 Dimensions
JB/T7384.1294
The dimensions and tolerances of the screw straightness inspection die shall comply with the provisions of GB1957. 4.1 The tolerance band diagram of the inspection die is shown in Figure 2.
4.2 Calculation of the inspection die S. The tolerances of S. or d are shown in Table 1. Table 1
S. or d basic size
upper deviation
Note: ①t. is the straightness tolerance, according to the provisions of Article 11.4 of GB3103.1. ②d. is the maximum outer diameter of the screw
4.3 The tolerances of S. and d\ of ​​the inspection die T and position requirements Z shall be in accordance with the provisions of Table 2. Table 2 (Extracted from Table 1 of GB1957)
Basic dimensions of workpiece
S, or d
>10~18
>18~30
>30~50
General dimensions of inspection mold
General dimensions of inspection mold shall be in accordance with the provisions of Table 3 (Type A inspection mold) and Table 4 (Type B inspection mold). Table 3
Lower deviation
JB/T 7384.12-94
Continued Table 3
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