About Hollow Allen Bolts
Hollow Allen bolts are socket head fasteners featuring an internal hex drive and a hollow core that helps reduce weight while maintaining structural reliability. This design makes them suitable for precision assemblies where space efficiency and controlled torque application are essential.
Hollow Allen bolts are commonly used in valve systems, fluid handling equipment, automotive components and in mechanical assemblies. They come in a wide range of sizes, forms of thread, material and surface finishes to conform to ASTM, ASME, DIN, ISO and BS standards so that they can be compatible across a wide range of industrial applications.
Hollow Allen 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 |
Hollow Allen 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 |
Hollow Allen Bolts Materials
Hollow Allen Bolts Specifications
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