About U Bolts
U Bolts are headless fasteners with a U- or C-shaped bent profile, primarily used for anchoring pipes, tubes, and round or square sections. Compared to J bolts, U bolts offer greater holding strength due to their dual-leg design, making them suitable for structural and pipe support applications.
U anchor bolts are typically installed using four hex nuts—two on each threaded leg—or fitted into pre-tapped holes. Also known as bent U bolts or U hook bolts, these fasteners are manufactured in metric and imperial sizes with UNC, UNF, UN, and ISO metric thread profiles. U bolts are produced across carbon steel, alloy steel, stainless steel, and other material grades in compliance with ASTM specifications
U Bolts Properties
| Property | Details |
|---|---|
| Manufacturing | Hot Forged / Cold Forged |
| Metric Size | M3 to M72 |
| Imperial Size | 1/4” to 3” |
| Threads | Metric, UNC, UNF, BSW |
| Form | Fully Threaded / Partially Threaded |
| Standards | ASTM, ASME, DIN, ISO, BS, IS |
| Sub Types | As per product category |
U Bolts Standards
| Standard | Size Range |
|---|---|
| ASME B18.2.1 / B18.2.2 | 1/4” to 3” |
| ASTM A194 / A193 | M6 to M72 |
| DIN 934 / DIN 6914 | M6 to M72 |
| ISO 4032 / ISO 7412 | M6 to M72 |
| BS 1769 | 1/4” to 2” |
| IS 1363 | M6 to M72 |
U Bolts Specifications
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