A round, low-profile dome head sits over a square neck that bites into the workpiece, letting carriage bolts be tightened from the nut side alone — the classic timber and steel-channel fastener.
Conforms to

Domed head over a square neck that locks into timber and channel.
A cross-section of stocked configurations. Not exhaustive — diameters, lengths, grades, and finishes extend across the full range on request.
Representative specifications — not exhaustive · NXB-CRG
Match the line to the load, the environment, and the standard it answers to.
Materials
Finishes
Standards
Typical applications
Served industries
Mating parts and adjacent lines engineers reach for alongside this one.
Six-sided structural workhorse for nut or tapped-hole joints.
M5–M48 · 1/4"–2"
Flush countersunk head with square neck for wear edges.
1/2"–1" · M12–M24
The standard six-sided nut for threaded assemblies.
M3–M48 · #4–2"
Oversized outer diameter spans thin or slotted material.
M5–M16 · 3/16"–1/2"
Grade, material, finish, and standard — matched to your joint and quoted from stock. Tell us the load case and we’ll confirm the line.