Hinge Mortising Jig for Doors: Router Templates India 2026 — How a router and hinge mortising jig cut clean, repeatable hinge recesses fast — and when batch fitting pays off on Indian sites.

Carpenter routing a butt-hinge recess into a door edge using a clamped mortising template

A hinge mortising jig turns the slowest, fussiest part of hanging a door — sinking three identical butt-hinge recesses dead level down a leaf edge — into a 20-second, repeatable router pass. Where a chisel-and-gauge mortise depends on the carpenter's eye and a steady hand, the jig clamps a hardened template to the edge and a router with a guide bushing follows it, cutting a recess of exact width, length and depth every time. On Indian sites running batches of identical flush doors, that consistency is the difference between a leaf that swings true and one that is hinge-bound. This guide covers what the jig is, how it works against hand mortising, how to set hinge positions to NBC and IS practice, the ₹ cost bands, and the project size at which the kit pays for itself. It complements the product-side door hinges guide — here we cover the new-fit craft, not the ironmongery itself.

What a hinge mortising jig is

A hinge mortising jig is a clamped guide that constrains a hand router so it can only cut the precise rectangular pocket a butt hinge needs to sit flush in the door edge (and, on better systems, the matching mortise in the frame). Three parts do the work:

The template / cassette — a metal or tough-polymer frame the size and shape of the hinge, mounted on a rail or sub-frame so multiple hinge templates space themselves automatically down the edge.
The router and guide bushing (collar) — a fixed or plunge router fitted with a straight cutter and a guide bushing that runs against the inside of the template window.
The clamps and edge stop — to register the jig square to the door edge and at the right offset from the face, so every recess lands in the same place leaf-to-leaf.

The cutter is a straight, often spiral, bit. Because the bushing has a diameter larger than the cutter, the finished recess is slightly smaller than the template window by the bushing offset (typically 4–6 mm of radius difference). Quality kits either give you a hinge that exactly fits the cut, or supply corner chisels to square the radiused corners a router leaves. Always test the offset on a scrap before cutting a real leaf.

How the router cuts the recess

The sequence is short once the jig is set. Mark the leaf and frame as a pair, clamp the template at the marked hinge centre, set the cutter depth to the hinge leaf thickness (usually 2.5–3.5 mm for a standard pressed-steel or stainless butt hinge to IS 1003), then plunge and route within the window in light passes. The bushing rides the template walls; you cannot wander outside the recess. A skilled hand clears a recess in well under a minute, including a final pass to flatten the floor of the mortise.

Two cautions specific to Indian sites:

1. Power and dust. Routers draw real current and stall on voltage dips; on sites with frequent cuts, batch your routing for stable-supply windows or run off an inverter/genset. MDF and flush-veneer doors throw fine dust — wear a mask and clear chips between passes.

2. Veneer tear-out. A sharp spiral down-cut bit and light passes protect the thin face veneer of flush doors. A blunt straight bit tears the lipping; replace bits before they char the cut.

Hand mortising versus the jig

Neither method is wrong; they suit different volumes and skill levels. Hand mortising — marking gauge, marking knife, sharp bevel chisel, mallet — needs no power, no setup and costs nothing beyond tools every fitter owns. It is right for one-off doors, repairs, and sites with no reliable power. The jig wins on speed, repeatability and consistency across a batch, but demands a router, a learning curve and an upfront spend.

Factor	Hand mortising (chisel)	Router + hinge jig
Time per recess	3–6 min	20–60 sec (after setup)
Setup time	None	10–20 min first leaf
Consistency leaf-to-leaf	Depends on the hand	Identical
Skill needed	High (sharpening, paring)	Moderate (router control)
Upfront cost	₹0 extra	₹4,000–₹30,000+
Power needed	No	Yes (router)
Best for	One-offs, repairs, no power	Batches of identical doors
Veneer tear-out risk	Low if sharp	Low with sharp spiral bit
Corner finish	Square as cut	Radiused — needs corner chisel

A blunt chisel tears flush-door veneer just as a blunt router bit does; keep both keen. For the wider kit choice, see the door fitting tools guide and the power tools for door fitting.

Setting hinge positions

The jig only cuts where you tell it, so the set-out comes first. Standard Indian practice fits three hinges per leaf for internal flush doors, with a fourth on heavy, tall or fire-rated leaves. Mark the leaf and frame together as a pair so recesses align exactly — never measure them independently. The figures below are rules of thumb consistent with IS 1003 / NBC 2016 practice; always confirm against the door schedule and the hinge maker's data.

Hinge / element	Position (rule of thumb)	Note
Top hinge	150–200 mm from head of leaf	Carries swing load
Bottom hinge	250 mm from floor (bottom of leaf)	Resists sag
Middle / third hinge	Mid-point, or one-third down from top	Anti-bow
Fourth hinge (heavy/fire)	Between top and middle	FD30/FD60 leaves
Recess depth	= hinge leaf thickness, 2.5–3.5 mm typical	Flush, not proud
Knuckle projection	Centre of barrel on the leaf face line	Sets clearance

Get your detailed marking sequence right before you route — the companion marking out door hardware guide covers the leaf-and-frame pairing and the gauge settings. For the actual hanging once recesses are cut, follow fitting door hinges. On fire doors, use CE/fire-rated hinges and never over-cut the recess into the intumescent line — the fire-door installation compliance guide explains the gap and integrity limits.

Accuracy and speed in practice

The jig's value is twofold. Accuracy: every recess shares the same depth and the same distance from the door face, so all three knuckles line up and the leaf hangs without the high-low twist that causes hinge-bind or a self-swinging door. Speed: once the jig is set for a door height, the fitter routes a full set of three recesses in two to three minutes and moves to the next identical leaf. A skilled carpenter who manages 4–6 hand-fitted flush doors a day can lift well past that on a batch with the jig once the rhythm is set — the gain is almost entirely in the hinge stage.

Cost and when the jig pays off

Prices below are indicative ₹ bands for 2026; hardware carries 18% GST, and tooling cost varies by brand and import source. Treat these as a rule of thumb.

Item	Indicative ₹ band	Notes
Basic single-hinge template + bushing	₹4,000–₹8,000	Reposition by hand per hinge
Adjustable multi-hinge jig (rail set)	₹12,000–₹30,000	Self-spaces 3–4 hinges
Router (if not already owned)	₹6,000–₹15,000	Plunge/fixed base
Spiral cutter + spare bits	₹500–₹2,000 each	Keep spares sharp
Corner chisel (square the radius)	₹600–₹1,500	If hinge needs square corners

The economics are simple. A jig costs time to set up but almost nothing to repeat. On a handful of doors, hand mortising is faster end-to-end because there is no setup. The cross-over comes with volume and repetition — a flat of identical flush doors, a hostel, an office fit-out, or a builder repeating the same leaf across units. As a rule of thumb, the kit starts paying for itself somewhere around 15–25 identical leaves, and clearly pays beyond that. For one-off premium joinery, custom sizes or repairs, the chisel still wins. Run the numbers for your job with the door fitting time estimator and price the labour against the kit using the door fitting cost estimator.

Whatever the method, the test is the hung door, not the recess: even 2–4 mm margins, a leaf that latches first time and does not self-swing. Where the work feeds a contract handover, the recesses become part of the workmanship measured under IS 1200 / CPWD specifications. For the full picture of hanging a door, return to the cluster pillar, the complete door guide.

Frequently asked questions

Do I need a router to use a hinge mortising jig?

Yes — the jig is only a guide template; the router and its guide bushing do the cutting. A plunge router gives the cleanest depth control. If you do not own one and only fit occasional doors, hand mortising with a sharp chisel is more economical than buying the whole kit.

How deep should the hinge recess be?

Cut the recess to the thickness of the hinge leaf — typically 2.5–3.5 mm for a standard pressed-steel or stainless butt hinge to IS 1003 — so the hinge sits perfectly flush with the door edge, neither proud nor sunk. Set the router depth on a scrap first and check the hinge sits level before routing the real leaf.

Why does the router leave rounded corners in the recess?

The straight cutter has a radius, so it cannot reach square into the corners. Either buy hinges with radiused leaves that match the cut, or square the four corners with a corner chisel. Many jig kits supply the matching radiused hinges so no corner work is needed.

At how many doors does the jig become worth it?

As a rule of thumb, somewhere around 15–25 identical leaves the setup time is repaid by the per-recess speed and consistency. Below that, hand mortising is usually faster end-to-end. Batch fit-outs — flats, hostels, offices — are where the jig clearly pays off.

Can I use a hinge jig on fire-rated doors?

Yes, but only with CE/fire-rated hinges and within the tested fire-door set. Do not over-cut the recess or breach the intumescent line or the leaf core, and keep three or more hinges as tested. See the fire-door installation compliance guide before routing any FD30/FD60 leaf.