STAINLESS STEEL BUMAX HEXAGON SET SCREWS

Bumax Hexagon Set Screws — A fully threaded hexagon-head fastener, threaded along its entire length in the pattern set out by a standard full-thread hexagon set screw, manufactured in Bumax's high-tensile A4/316 stainless to strength levels equivalent to grade 8.8/10.9 carbon steel. Full-length threading makes it the right choice wherever the fastener needs to engage tapped material along its whole length, or where grip length varies between assemblies and a fixed unthreaded shank section — as found on a hexagon bolt — isn't practical; typical uses include machinery assembly, structural framing, equipment mounting, and general engineering work where the fastener is driven into a tapped hole rather than passing through a clearance hole into a nut. Where the joint instead needs a precise shear-bearing surface through the clamped material, a hexagon bolt with a plain shank is usually the better-suited option from the same Bumax range. The high-tensile A4/316 specification is worth its premium over a standard A2 or A4 set screw specifically where the joint needs both a high clamping force and resistance to marine, chemical, or outdoor corrosion together — for lighter-duty fixings in a dry, sheltered environment, a standard-grade stainless or carbon steel set screw is usually the more cost-effective option. Selecting the right size means matching thread diameter, pitch, and length to the tapped depth or grip length required, keeping in mind that a fully threaded fastener engaging a blind tapped hole needs enough thread length to develop the full strength of the joint without bottoming out. Bumax's no-galling manufacturing is particularly relevant here, since full-length threads engaging a tapped stainless hole are more prone to seizing under torque than a bolt's shorter thread section, and every batch is traceable back to the original mill.

FAQs
How much thread engagement do I need in a tapped hole?
The general principle is enough engagement that the joint's strength is limited by the fastener's tensile capacity rather than by thread shear in the tapped material; for a critical or highly loaded joint, engagement length is best confirmed by calculation for that specific application rather than assumed.

Can Bumax hexagon set screws be used with a nut instead of a tapped hole?
Yes, a fully threaded set screw functions the same way whether it engages a tapped hole or passes through a clearance hole into a nut, though a bolt with a plain shank often gives a more accurate shear fit in a through-hole joint.

Do these set screws resist galling in a blind tapped hole?
Yes, the no-galling manufacturing that runs through the Bumax range is particularly relevant to fully threaded fasteners, since a longer engaged thread length in a blind hole is more prone to seizing under torque than a bolt's shorter thread section.