A Tap Bolt is similar to the Hex Cap Screw except it is threaded all the way to the head. There is no washer face under the head and comes in Grade 2, Grade 5 and Grade 8.
The Gr. 2 is to be used in tapped holes which are threaded full length. Used instead of a stud and a nut, but can be used with a nut if requiered for application. The Gr. 5 is commonly used to mount motors to machinery, also popular in automotive and truck repair. The Gr. 8 is use also in automotive and fleat industries where greater tensile strength is required than can be met by the Gr. 5.
Nominal
Or Basic |
E |
F |
G |
H |
| Body |
Diameter |
Width Across Flats |
Width Across Corners |
Head
Height |
| Product Diam. |
Max. |
Min. |
Basic |
Max. |
Min. |
Max. |
Min. |
Basic |
Max. |
Min. |
| 1/4 |
0.2500 |
| 5/16 |
0.3125 |
| 3/8 |
0.3750 |
| 7/16 |
0.4375 | |
0.2500
0.3125
0.3750
0.4375 |
0.2450
0.3065
0.3690
0.4305 |
7/16
1/2
9/16
5/8 |
0.438
0.500
0.562
0.625 |
0.428
0.489
0.551
0.612 |
0.505
0.577
0.650
0.722 |
0.488
0.557
0.628
0.698 |
5/32
13/64
15/64
9/32 |
0.163
0.211
0.243
0.291 |
0.150
0.195
0.226
0.272 |
| 1/2 |
0.5000 |
| 9/16 |
0.5625 |
| 5/8 |
0.6250 |
| 3/4 |
0.7500 | |
0.5000
0.5625
0.6250
0.7500 |
0.4930
0.5545
0.6170
0.7410 |
3/4
13/16
15/16
1-1/8 |
0.750
0.812
0.938
1.125 |
0.736
0.798
0.922
1.100 |
0.866
0.938
1.083
1.299 |
0.840
0.910
1.051
1.254 |
5/16
23/64
25/64
15/32 |
0.323
0.371
0.403
0.483 |
0.302
0.348
0.378
0.455 |
| 7/8 |
0.8750 |
| 1 |
1.0000 |
| 1-1/8 |
1.1250 |
| 1-1/4 |
1.2500 | |
0.8750
1.0000
1.1250
1.2500 |
0.8660
0.9900
1.1140
1.2390 |
1-5/16
1-1/2
1-11/16
1-7/8 |
1.312
1.500
1.688
1.875 |
1.285
1.469
1.631
1.812 |
1.516
1.732
1.949
2.165 |
1.465
1.675
1.859
2.066 |
35/64
39/64
11/16
25/32 |
0.563
0.627
0.718
0.813 |
0.531
0.591
0.658
0.749 |
| 1-3/8 |
1.3750 |
| 1-1/2 |
1.5000 | |
1.3750
1.5000 |
1.3630
1.4880 |
2-1/6
2-1/4 |
2.062
2.250 |
1.994
2.175 |
2.382
2.598 |
2.273
2.480 |
27/32
15/16 |
0.878
0.974 |
0.810
0.902 |
