Half thread (part-threaded) hex bolts have a plain shank that fills the hole in a shear connection, which is why structural engineers specify them for beam splices, base plates and machinery. We stock DIN 931 / ISO 4014 in Umm Al Quwain from M6 to M56 and ¼" to 2", grade 4.6, 8.8 and 10.9, black, zinc plated and hot-dip galvanized.
A half thread hex bolt has thread only on the end of the shank, leaving a plain, full-diameter section under the head. In a joint loaded in shear the plain shank bears on the plates, giving higher capacity and less deformation than a threaded shank. Thread length follows the standard formula (2d + 6 mm up to 125 mm long) so the plain section is predictable for the designer.
Applications
- Structural steel beam splices and connections
- Base plates and machinery hold-downs
- Crane rails, runway beams and conveyors
- Heavy vehicle and trailer chassis
- Wind turbine tower and solar structures
- Bridge, gantry and pipe rack bolting
Standards, grades & finishes
Bolts to DIN 931 / ISO 4014 / BS 3692 / ISO 4016 (grade C), property class 4.6, 8.8 and 10.9 to ISO 898-1, stainless A2 / A4, threads ISO 965 6g. Imperial UNC to ASME B18.2.1 Grade 5 / 8. Nuts ISO 4032, washers DIN 125A / ISO 7089. Finishes black, zinc plated to ISO 4042, hot-dip galvanized to ISO 10684 with nuts tapped oversize.
This item is imported from approved mills and held in stock in our Umm Al Quwain warehouse alongside the anchor bolts, studs and plate washers we manufacture ourselves, so complete bolt sets ship from one source. Tensile, hardness and chemical testing is carried out by independent UAE-accredited laboratories, and EN 10204 3.1 certificates are issued with every batch. We supply across the GCC, MENA and Africa.