Description
KKS Kuroda UFB-3 MT3 / NT40 Universal Fine Boring Head Kit
The Kuroda UFB-3 is a precision fine boring head from one of Japan’s most respected machine tool accessory manufacturers. This complete kit gives you a capable, shop-ready boring solution for milling machines and machining centres — arriving with its original MT3 arbour, an NT40 adaptor, all original accessories, and the factory metal storage case. Whether you’re opening up a bearing housing to a tight tolerance, interpolating a precision bore on a knee mill, or finishing a reamed hole that needs that last half-thou taken off the wall, the UFB-3 delivers repeatable, micrometer-controlled cutting depth adjustment in a compact, well-balanced head.
- Micrometer-sleeve fine adjustment — The UFB-3’s knurled adjustment collar provides graduated radial tool offset in fine increments, letting you creep up on a target bore diameter with genuine control rather than tapping a boring bar and hoping. That direct, readable adjustment is what separates a dedicated fine boring head from a roughing bar when you’re chasing a H7 fit.
- MT3 taper arbour included — The native shank is Morse Taper 3, making this immediately at home in a knee mill, a bench-type vertical mill, or any machine with an MT3 spindle. No intermediate adaptor needed for MT3 machines — fit, tighten the drawbar, and bore.
- NT40 (BT40/CT40) adaptor fitted — The included NT40 adaptor extends compatibility to larger vertical machining centres and CNC knee mills running NT40/BT40 tooling. This is the practical reason to own both: one boring head serves your manual mill and your machining centre without purchasing a second unit.
- Complete boring bar accessory set — The kit includes the full suite of boring bars and tool holders stored in the original segmented metal case. Having the matched boring bars matters because the UFB-3’s cartridge geometry is specific — having the correct bars on hand means you can select the right overhang and tool material for the bore diameter and material without improvising.
- Ideal for — Finishing precision bores to H6/H7/H8 tolerances on mild steel, cast iron, and aluminium; line-boring bearing housings; opening up pilot-drilled holes to a fitted diameter on a knee mill or VMC; correcting undersized reamed holes; single-point finishing on jig-borer-style work on a manual mill.
Condition
Used (Good Condition / Complete Kit, Original Case)
The boring head body, adjustment collar, and shank surfaces show the expected patina of a used precision tool — light oxidation on non-critical surfaces and minor handling marks consistent with workshop storage. Importantly, the micrometer adjustment mechanism operates smoothly with no detectable backlash slop or roughness in the sleeve movement, and the tool clamping screws engage cleanly. The boring bars present with their ground shanks intact — no visible nicks or rolling damage on the seating surfaces that would affect concentricity in the cartridge. The NT40 adaptor taper face appears clean and free of dings. As with any used fine boring head being put back into precision service, it is good practice to verify the head’s offset-zero repeatability against a test bore or by indicating the tool tip through a full rotation before committing to a critical job. If you need traceable accuracy confirmation, checking the adjustment graduation against a DTI on the tool tip is a ten-minute bench exercise that will give you full confidence.
Included
- 1 x Kuroda UFB-3 Fine Boring Head (MT3 M12 native shank)
- 1 x NT40 adaptor (bolted to head)
- Full set of original boring bars and tool holders (as shown)
- Original metal storage case with fitted insert
- Small handful of used/ground HHS bits
Not Included
- Drawbar (machine-specific — not supplied as standard with boring heads)
- Cutting inserts (consumables — source to suit your material and geometry preference)
Brand Information
Kuroda Precision Industries is a Japanese manufacturer with a long-standing reputation in precision machine tool accessories, linear guides, and tooling systems. Produced in Japan and distributed throughout Asia-Pacific industrial markets, Kuroda tooling sits in the same credible mid-to-upper tier as Nikken and NT Tool for rotating toolholders and boring systems — respected by production shops and toolrooms alike for consistent manufacturing quality and durable construction. Japanese origin here is a genuine selling point: the ground surfaces, fit of the adjustment mechanism, and material selection reflect the same standards that make Japanese metrology and tooling equipment a benchmark in Australian workshops.
Specifications
| Feature | Specification |
|---|---|
| Brand | Kuroda (KKS) |
| Model | UFB-3 |
| Type | Fine Boring Head (Single-Point) |
| Native Shank / Taper | MT3 (Morse Taper 3), M12 drawbar thread |
| Adaptor Included | NT40 (compatible with BT40 / CT40 spindles) |
| Adjustment Type | Micrometer-sleeve radial offset adjustment |
| Boring Bar Shank Size | As per original kit — refer to included bars (various, see photos) |
| Country of Origin | Japan |
| Material / Construction | Hardened and ground steel body |
| Condition | Used — Good Condition |
| Included Items | UFB-3 boring head (MT3 M12), NT40 adaptor, original boring bar accessory set, original metal storage case |
| Not Included | Drawbar, cutting inserts / tool bits |
Keywords
Kuroda UFB-3, Kuroda fine boring head, KKS UFB-3 MT3, fine boring head NT40, UFB-3 boring head kit, precision boring head machining centre, MT3 boring head mill, NT40 BT40 boring head, single point boring bar, fine boring head Australia, VMC boring head, toolroom boring head
