Low Profile Head Half Hex Rivet Nuts
What are low profile head half hex rivet nuts? These pair a half hex body, which keys into a matching hex hole so the insert cannot rotate, with a low profile head that keeps installed height to a minimum. It is a combination aimed at demanding joints: positive mechanical anti-rotation for torque, and a head that stays out of the way of whatever mounts on top. The thinwall body sets reliably in sheet metal. AlbanyCountyFasteners.com stocks these in 18-8 stainless and aluminum, in inch and metric threads.
Why this combination suits production work
Because it removes two variables at once. The hex body means the insert cannot spin, regardless of how firmly the bolt is torqued or how the panel material varies from batch to batch, so a whole failure mode disappears from the assembly process. The low profile head means the mounted component sits closer to the panel and clearance calculations get easier, which matters when a design is tight. Together they suit the kind of work where consistency across hundreds of units is worth more than the convenience of a plain drilled hole: chassis assembly, equipment manufacture, and anything where a rework costs far more than the hole preparation did.
Why choose low profile half hex rivet nuts
- Hex body keys into the panel for positive anti-rotation under torque
- Low profile head minimises installed height
- Consistent results across production runs regardless of material variation
- Thinwall body sets reliably in sheet metal
- Available in 18-8 stainless and aluminum, inch and metric
Materials and sizes
- 18-8 stainless, inch, in #10-32, 1/4-20, and 5/16-18
- 18-8 stainless, metric, in M6
- Aluminum, inch, in 1/4-20
- Aluminum, metric, in M6
- Requires a hex hole matched to the body across-flats dimension
Common applications
- Production chassis and frame assembly
- Equipment manufacture with specified torque values
- Joints where a spun insert would mean scrapping the panel
- Machinery guards and covers removed repeatedly in service
- Marine and outdoor equipment in stainless
- Aluminum assemblies needing positive anti-rotation
Where a hex hole is not practical, ribbed rivet nuts give good anti-rotation in a plain drilled hole. Background on hex hole preparation is on our half hex rivet nuts page.
Related Categories
- Half Hex Rivet Nuts
- Ribbed / Knurled Rivet Nuts
- Round Body Rivet Nuts (Smooth)
- Rivet Nuts
- Rivet Tools
Low Profile Half Hex Rivet Nut FAQs
How low is the low profile head?
Lower than a standard flat head while retaining enough diameter to bear on the panel. It still sits proud, just by less, which is usually enough to clear an adjacent component or reduce a stack height.
What hex hole size do I need?
Matched to the across-flats dimension of the insert body, which is specified per size and is considerably larger than the thread. Confirm the dimension before buying a punch, since punches are size specific.
Can I punch a hex hole in thick material?
Punching works well in sheet metal. In thicker material, broaching or a hex punch rated for the thickness is needed, and at some point the practical answer becomes a ribbed insert in a drilled hole instead.
Does the low profile head reduce holding power?
Slightly less bearing area than a full flat head, so in very thin panel it will pull through sooner. With a half hex body the anti-rotation does not depend on the head, so only pull-through resistance is affected.
Which material should I choose?
Stainless for steel panels, higher load, and corrosion resistance. Aluminum for aluminum panels, where matching the material prevents corrosion around every hole.
Do I need a special tool?
No, a standard rivet nut tool with a mandrel matched to the thread size. The hex feature affects the hole, not the setting process.