Knock-down fittings for flat-pack and modular furniture — JCBC bolt, T-nut, D-nut and barrel nut. Trusted by furniture manufacturers across India.
Knock-down (KD) fittings let furniture be manufactured, packed flat, shipped, and then assembled, disassembled and reassembled on site — without glue and without damaging the panel each time. This is the fitting system behind virtually all modern flat-pack and modular furniture, from bed frames and cots to modular cabinets and wardrobes.
The core idea across all four fitting types is the same: an insert nut or cross dowel is set into one panel, providing a reusable internal thread, and a matching bolt passes through the adjoining panel to draw the joint tight. The choice between JCBC bolt + barrel nut, T-nut or D-nut depends on the joint geometry, the panel material and how many times the joint will be assembled and disassembled.
Excel Trading Corporation stocks JCBC bolts, T-nuts, D-nuts and barrel nuts — covering the standard knock-down fitting requirements for bed frames, cabinet carcasses and general furniture assembly.
A joint connector bolt that threads into a barrel nut set in the adjoining panel, drawing two panels together at a right angle. The standard fixing for bed frames and cots.
An insert nut with prongs around its flange that bite into wood or particleboard when pressed or hammered in — providing a reusable internal thread with strong anti-rotation.
An insert nut with a D-shaped (flat-sided) flange that seats into a matching recess for anti-rotation — an alternative to prong-based T-nuts on panels more prone to splitting.
A cylindrical, internally threaded nut (also called a cross dowel) that sits inside a cross-drilled hole, giving a concealed, high-strength threaded point for a JCBC bolt to engage.
Pre-drill to the specified pilot hole size: Particleboard and MDF split easily if the hole is undersized, and strip out if oversized.
Keep a safe edge distance: Insert nuts and cross dowels placed too close to a panel edge risk splitting the material during installation or under load.
Press or hammer T-nuts and D-nuts in squarely: A tilted insert will not seat flush and will cause bolt cross-threading during assembly.
Do not overtighten JCBC bolts: Particleboard and MDF threads strip out under excess torque — tighten until the joint is snug, not maximum force.
Align the barrel nut's cross-hole correctly: The drilled cross-hole must line up with the bolt's entry hole in the adjoining panel — check alignment before final assembly.
For load-bearing joints, size the fastener for the load: Bed frames and cots carry repeated dynamic load — do not substitute a lighter-duty fitting to save cost on these joints.
A knock-down fitting is a fastener designed so furniture can be assembled, disassembled and reassembled multiple times without damaging the panel — essential for flat-pack furniture shipped disassembled and built on site. JCBC bolts, T-nuts, D-nuts and barrel nuts are all common knock-down fitting types.
A JCBC bolt is typically paired with a barrel nut (cross dowel) to join two panels at a right angle — common in bed frames and cots. The barrel nut sits inside a cross-drilled hole in one panel, and the bolt passes through the adjoining panel to thread into it, drawing the two panels tightly together.
Both provide an internal thread in wood or particleboard. A T-nut has prongs around its flange that bite into the wood when pressed in, resisting rotation. A D-nut uses a D-shaped flat-sided flange that seats into a matching recess — often preferred where the panel material is more prone to splitting.
Yes — T-nuts, D-nuts, barrel nuts and JCBC bolts are all widely used in MDF, particleboard and chipboard furniture. Correct pilot hole sizing matters more in these materials than solid wood, since particleboard has lower resistance to splitting and strip-out.
Always pre-drill a pilot hole to the specified size, keep a safe minimum distance from the panel edge, and avoid overtightening — particleboard and MDF strip out easily under excess torque.
Excel Trading Corporation stocks JCBC bolts, T-nuts, D-nuts and barrel nuts at our store — 163, Sadar Patrappa Rd, Kumbarpet, Bengaluru 560002. We supply furniture manufacturers across Karnataka and India. Call +91-9448239476 or email info@exceltrading.in for pricing and availability.
