Your workshop ordered two thousand dovetail router bits from a new factory, and the price was half of what the last supplier charged. The first hundred joints came together fine. Then the drawers started fighting: pins that would not seat, tails that sat proud by a millimeter, and a batch of cabinet fronts scrapped before lunch. The factory's spec sheet said the angle was 7 degrees. The actual grind drifted to 7.6 degrees across the batch, and half a degree is enough to break a dovetail joint. Most dovetail router bit orders fail before the PO, not after the shipment, because the buyer checks the price and the shank size and skips the angle tolerance, the carbide grade, and the grind consistency. This guide walks through the dovetail router bit checks that belong in the RFQ, so the bits you approve on the sample cut match the ones that arrive by the box.
The Angle: Why Half a Degree Breaks the Joint
The dovetail angle is the whole product. Standard dovetail router bit angles run 7, 8, 10, and 14 degrees, and the angle must match the jig or the joint system you cut with. Through dovetail jigs commonly demand an 8 degree bit; half-blind work may use 7 or 10. A bit ground at 7.6 degrees in a jig tuned for 7 cuts pins and tails that do not meet at the same depth. Ask the supplier for the actual angle tolerance - a quality factory holds half a degree or better, and budget bits can drift a full degree between batches. The dovetail router bit angle is the first line on the RFQ, stated as a nominal value with a tolerance, not just a catalog number.
Carbide Grade and Grind: C3, Micrograin, and Edge Life
The cutting edge is carbide, and not all carbide is the same. Quality dovetail router bits use C3 micrograin carbide, which holds a sharp edge longer and cuts cleaner through hardwoods and plywood. Lower grades dull faster, and a dull edge burns the wood and leaves fuzzy shoulders on the joint. The grind matters as much as the grade: the cutting angle, the hook, and the edge finish decide how the bit enters the wood. Ask the factory which carbide grade the bit uses and how they verify grind consistency across a production batch. A dovetail router bit that cuts clean on sample one and burns on sample fifty is a grind-control problem, and it belongs on the factory's test report, not on your workshop floor. The carbide grade is a dovetail router bit specification you can verify from the factory's material certificate.
Shank, Diameter, and TIR: The Specs That Fit the Router
Before the angle, the bit has to fit the machine. Dovetail router bits ship with 1/4 inch or 1/2 inch shanks, and the shank must seat without wobble in your collet. Check the shank diameter tolerance, because an undersized shank slips and an oversized one refuses the collet. Then check the total indicated runout, or TIR, which measures how much the bit wobbles as it spins. A high TIR cuts an oversized slot and shortens edge life, and it is the hidden cause of "the bit was fine yesterday" failures. Put the shank diameter, the cutter diameter, the overall length, and the TIR limit on the RFQ. The dovetail router bit that fits the collet and spins true is the bit that cuts the joint it was ground for.
Match the Bit to the Material
Dovetail bits cut hardwoods, softwoods, plywood, and MDF, and the material changes the spec. Hardwoods demand a sharper, more consistent edge and slower feeds; MDF and plywood wear edges faster and reward coatings that reduce heat. Softwoods cut easily but fuzz up without a clean grind. Confirm the intended material with the supplier, because dovetail router bit life and finish both depend on it, and ask whether the coating - TiN or similar - is matched to the plywood or hardwood line. A dovetail router bit sold for cabinet drawers in oak will behave differently in a line cutting melamine-faced MDF. Name the material on the RFQ, and let the factory select the edge and coating instead of shipping a one-size-fits-all blank.
What to Put in the RFQ
The RFQ should read like the inspection sheet you will use at delivery. Include the drawing or nominal values: angle with tolerance, cutter diameter, shank diameter, overall length, and TIR limit. State the carbide grade, the coating, and the material the bit is ground for. Confirm the minimum order quantity, the sample policy, and the batch consistency requirement - the bits in one carton should come from one grind setup. Ask for packaging that protects the edges in transit, because a sharp bit that rattles loose cuts like a dull one. The dovetail router bit spec sheet you write at RFQ stage is the document you use to reject a bad batch, so write it precisely and attach the drawing.
The Sample Test Before the Batch
Release the batch on proof, not on promises. Order a sample set cut from the same grind setup as production, and run it on the material and the jig you actually use. Measure the angle on the sample, not the brochure: a simple angle gauge or a projection check confirms the grind. Cut a full joint set, inspect the pins and tails for clean shoulders and consistent depth, and run an edge-life check on a harder wood to see how long the edge holds. Then plan batch checks: a percentage of every carton measured for angle and runout before shipment. The dovetail router bit that passes the sample test and the batch audit is the bit your workshop can build a production line around, and the order that ships with measured results has nothing left to surprise.
The checks line up: verify the angle and its tolerance, confirm the carbide grade and grind control, check the shank and TIR specs, match the bit to the material, put the full spec in the RFQ, and run a sample test before the batch ships. Run every dovetail router bit order through those six checks and the joint failures you hear about from other workshops stay on their benches, not yours. Our V groove router bit guide covers angle selection for decorative grooves, our wood shaper bits guide walks through cutter profiles for cabinet work, and our 45 degree angle router bit guide shows how angle tolerance works on chamfer and bevel work. Send your drawing, material, and annual volume to our inquiry page, and get a quote built around the checks in this guide - the angle first, the price second.
