Metric 18-8 Stainless Steel Thinwall Half Hex Low Profile Head Rivet Nuts
What are metric stainless half hex rivet nuts? These are blind threaded inserts in 18-8 stainless threaded to metric sizes, with a half hex body and low profile head. The hex section keys into a matching hex hole so the insert cannot rotate, giving positive anti-rotation on metric assemblies that a friction-based insert cannot match. Stainless adds corrosion resistance and load capacity for outdoor and marine service. AlbanyCountyFasteners.com stocks M6.
Why metric equipment often calls for half hex
Imported industrial and agricultural equipment tends to be specified more tightly than general fabrication, with torque values called out on the assembly drawing rather than left to judgment. That changes what a rivet nut has to survive. A joint tightened to a specified figure puts far more rotational load on the insert than a bolt run down by feel, and friction-based inserts are the ones that give way first. A hex body is keyed into the panel, so the specified torque goes into clamping the joint rather than testing whether the insert will turn. In stainless, it also survives the washdown and outdoor exposure that a lot of this equipment sees.
Why choose metric stainless half hex rivet nuts
- Accepts standard metric bolts on imported and European equipment
- Hex body gives positive anti-rotation under specified torque
- Corrosion resistance for marine, washdown, and outdoor service
- Higher load capacity than aluminum at the same thread
- Low profile head minimises installed height
Size and grip range
- M6-1.0, 0.7 to 4.2mm grip range
- Requires a hex hole matched to the body across-flats dimension
- Measure panel thickness against the grip range before ordering
- Contact us for metric sizes outside the stocked range
Common applications
- Imported machinery and European built equipment
- Metric chassis and frame assembly
- Agricultural and industrial equipment from metric markets
- Marine equipment using metric hardware
- Washdown equipment with specified torque values
- Any metric joint where spin-out would be costly
For inch threads, see our 18-8 stainless half hex rivet nuts. On aluminum panels, metric aluminum half hex inserts avoid a galvanic couple.
Related Categories
- Low Profile Head Half Hex Rivet Nuts
- Metric Aluminum Half Hex Rivet Nuts
- Half Hex Rivet Nuts
- Ribbed / Knurled Rivet Nuts
- Rivet Tools
Metric Stainless Half Hex Rivet Nut FAQs
Can I use an inch bolt in an M6 insert?
No. M6 and 1/4-20 are close in diameter but the pitches differ, so an inch bolt will cross-thread and damage the insert. Use metric hardware.
What hex hole size does M6 need?
Matched to the body across-flats dimension, which is specified for the insert and considerably larger than the thread. Confirm before ordering a punch.
Do I need a metric mandrel?
Yes. The tool threads onto the insert to pull it, so the mandrel must match the M6 thread exactly. An inch mandrel will not engage.
Why is M6 the stocked size?
It is the most common thread on metric panel and accessory mounting, covering the majority of applications. Contact us for other metric sizes.
Are these harder to set than aluminum?
Yes, stainless requires noticeably more pulling force. A ratcheting or pneudraulic tool makes M6 stainless comfortable for repeat installation.
Is 18-8 adequate for outdoor equipment?
Yes for general outdoor and above waterline marine service. It handles rain, salt air, and washdown well over long service life.