Swivel base for 721/6 and 721Q/6

The 721.1/6 swivel base mounts between the bench and a 125 mm-jaw Unior vise and lets the whole vise rotate 360°. Instead of unclamping a workpiece and re-setting it to reach the far side, you swing the vise to the angle the job needs and keep working. That matters on a bike-shop bench. A vise is the second purchase after the repair stand (our workshop hand tools guide makes the case), and the jobs it earns its keep on (cutting a steerer, trimming a seatpost, pressing a bushing, holding a stem) each want the work presented square to your saw or press. A fixed vise makes you walk around the work; a swivel base brings the work around to you. Fitment This is the 125 mm size of the base, code 621483. It fits the 125 mm-jaw vises in the 721 family: the 721/6 (621481), the 721Q/6 (621482), and the 125 mm IRONGATOR (721Q/6-US, 625130) sold here. If your vise is the 150 mm IRONGATOR, this base is the wrong size; you want the 150 mm swivel base, code 621569, instead. Mounting The base bolts to the bench through the four ø10.5 mm holes in its corners, set on a 126 × 126 mm square, and the vise then bolts onto the base's rotating disc. The bench pattern is the base's own, not the vise's, so retrofitting under an already-mounted vise means re-drilling the bench. Unior's guidance: use bolts in all of the holes, with lock washers, so nothing works loose under load. The base raises the vise by 70 mm. Specs Article number: 721.1/6 (125 mm size, code 621483) Fits: 721/6, 721Q/6, and 721Q/6-US (125 mm IRONGATOR) bench vises Rotation: 360° Base plate: 149.9 × 149.9 mm, grey cast iron; other parts special tool steel Added height under the vise: 70 mm Bench bolt pattern: 126 × 126 mm, four ø10.5 mm holes Weight: 2.59 kg Lifetime warranty Built in Zreče, Slovenia Unior has been forging hand tools in Zreče, Slovenia, since 1919. The 721.1/6 follows the house recipe: grey cast iron for the base plate, special tool steel for the other parts, and a lifetime warranty behind it. Grey cast iron is an iron and carbon casting alloy with flake graphite in its structure, not a steel; the graphite damps vibration, and the material is far stronger in compression than in tension, which is why vise bodies and machine bases have been cast from it for over a century. Pro tip from our mechanics Mock up the 70 mm of added height against your saw and press working heights before you drill the 126 × 126 mm pattern. Then run bolts in all four ø10.5 mm holes with lock washers, per Unior's guidance, so the base can't work loose as you swing the vise. Workshop hand tools every bike shop needs → FAQ Which vises does this swivel base fit? It fits the 125 mm-jaw vises in Unior's 721 family: the 721/6 (code 621481), the 721Q/6 (code 621482), and the 721Q/6-US sold here as the 125 mm IRONGATOR bench vise (code 625130). This listing is the 125 mm size of the 721.1/6 base, code 621483. Does it fit the 150 mm IRONGATOR vise? No. The 150 mm IRONGATOR takes the 150 mm size of this base, code 621569, which we sell as a separate listing: Swivel base for 721/6 and 721Q/6. The base on this page, code 621483, fits the 125 mm-jaw vises only. Do I have to re-drill my bench to fit it? If your vise is already mounted, yes. The base bolts to the bench through its own four corner holes, 10.5 mm diameter on a 126 x 126 mm square, and that pattern is not the same as the vise's direct mounting pattern. The vise then bolts onto the base's rotating disc. Unior's guidance is to use bolts in all of the holes, with lock washers. How much height does the base add under the vise? 70 mm, about 2.75 inches. A vise mounted on the base sits that much higher than one bolted straight to the bench, so check the resulting jaw height against your working height before you drill.