Categories
- Pipe & Tube (17)
- Flange & Fitting (96)
- Fastener & Gasket (12)
- Valve & Pump (18)
- Base Material (10)
- Equipment (6)
- Application (25)
- Technical (106)
» Fastener & Gasket » ASME B18.2.1 Askew Head Bolt
ASME B18.2.1 Askew Head Bolt
July 24, 2019
General Introduction & Technical Drawing
The technical drawing for an askew head bolt manufactured in accordance with ASME B18.2.1
Shijiazhuang Metalsin supplies askew head bolts manufactured in accordance with ASME B18.2.1. The askew head bolt, evolving from square head bolt, is primarily used in conjunction with embedded wedge insert in structural construction. It has an angle of bearing surface with respect to shank to mate with the slope of the wedge insert. Askew head bolts are only available with unified coarse (UNC) threads. They are rarely used in modern engineering but are occasionally seen in renovation jobs.
Body Diameter, E & Radius of Fillet, R
| Nominal | E | R | ||
| Size | Max. | Min. | Max. | Min. |
| 3/8 | 0.388 | 0.360 | 0.03 | 0.01 |
| 1/2 | 0.515 | 0.482 | 0.03 | 0.01 |
| 5/8 | 0.642 | 0.605 | 0.06 | 0.02 |
| 3/4 | 0.768 | 0.729 | 0.06 | 0.02 |
| 7/8 | 0.895 | 0.852 | 0.06 | 0.02 |
| 1 | 1.022 | 0.976 | 0.09 | 0.03 |
Width Across Flats, F & Width Across Corners, G
| Nominal | F | G | ||
| Size | Max. | Min. | Max. | Min. |
| 3/8 | 0.562 | 0.544 | 0.795 | 0.747 |
| 1/2 | 0.750 | 0.725 | 1.061 | 0.995 |
| 5/8 | 0.938 | 0.906 | 1.326 | 1.244 |
| 3/4 | 1.125 | 1.088 | 1.591 | 1.494 |
| 7/8 | 1.312 | 1.269 | 1.856 | 1.742 |
| 1 | 1.500 | 1.450 | 2.121 | 1.991 |
Head Dimensions, H1 / H & Maximum Unthreaded Length, S
| Nominal Size | H1 | H | S | |
| Max. | Min. | |||
| 3/8 | 0.317 | 0.277 | 0.250 | 0.250 |
| 1/2 | 0.411 | 0.371 | 0.328 | 0.312 |
| 5/8 | 0.520 | 0.480 | 0.422 | 0.344 |
| 3/4 | 0.614 | 0.574 | 0.500 | 0.406 |
| 7/8 | 0.723 | 0.683 | 0.594 | 0.438 |
| 1 | 0.801 | 0.761 | 0.656 | 0.500 |
Thread Length
For L ≤ 6″, LT equals twice the basic thread diameter plus 0.25″; For L > 6″, LT equals twice the basic thread diameter plus 0.50″. If L ≤ LT + S, the askew head bolt shall be threaded for full length.
| ASME B18.2.1 Nine Types of Bolts & Screws | ||
|---|---|---|
| Square Head Bolt | Hex Bolt | Heavy Hex Bolt |
| Askew Head Bolt | Hex Cap Screw | Heavy Hex Screw |
| Hex Flange Screw | Lobed Head Screw | Lag Screw |
Maybe you like also
Copy©2019 | Shijiazhuang Metalsin Pipeline Tech Co., Ltd
Service
Work Time: 8:30-18:00
Welcome to contact us at your best convenience.
Welcome to contact us at your best convenience.