Specifications
| Material | High-tensile alloy steel |
| Grade | Grade 8.8 |
| Standard | ASTM A325 / ISO 898 |
| Diameters | 3/8" to 1" |
| Lengths | 1" to 6" |
| Thread | UNC / metric coarse |
| Finish | Plain (black) / Zinc-plated / Hot-dip galvanized |
Description
High Tensile Square Head Bolt — Grade 8.8 bolt for structural, machinery and general fastening. Complete with nut and washer on request. Stocked across common diameters and lengths in plain (black) and other finishes.
The high-tensile square head bolt pairs a robust four-sided head with high-strength alloy steel, built for heavy machinery, mining and industrial equipment where fasteners face extreme loads and vibration. The square head resists rounding and can be held against a flat surface or in a recess to stop it turning, while the high-tensile grade withstands stresses that would shear an ordinary bolt. These are the fasteners for crushers, mills and heavy plant.
High-tensile square head bolts are supplied in a range of diameters and lengths with matching nuts. They are specified for demanding industrial duty rather than general assembly. See the specifications below for available sizes.
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