HSS Piloted Drill Reamer .247" w/ Coolant Holes, TiAlN Coated x 4-1/2" Aircraft Tooling

Piloted drill reamer with a .247 inch caliper-measured diameter and a 4-1/2 inch overall length, made of HSS high-speed steel with a TiAlN coating and coolant holes that feed coolant to the cutting edge to flush chips clear. The pilot tip guides the tool true so the finished hole holds its diameter and runs straight.

This is aircraft tooling, the type of precision hole tool used in aircraft and aerospace structural assembly where fastener holes must meet exacting tolerances. The TiAlN coating adds heat and wear resistance for harder alloys.

This is a single used reamer. Sold as-is, surplus from King Surplus inventory in Del Rio, Texas. Same-day shipping on orders before 3:00 PM CT.

• Manufacturer: not established. No manufacturer name is visible on the tool, and no model or part number is legible.
• Type: Piloted drill reamer, two flute, coolant-fed, with a stepped shank - all as shown in the photographs
• Coolant holes: present, visible through the flutes
• FLAG for review, stamped shank mark: this pass reads the shank stamp as "70", "C522" (partially cut off), "0" and "2280". An earlier pass read a mark on this same shank as "CLEV", which would point to Cleveland Twist Drill. A stamp that reads differently between photographs is not evidence, so no manufacturer is attributed to this tool. It needs a person with the tool and a loupe. Under no circumstance should "Cleveland Twist Drill" be written into this record on the strength of these images.
• Cutting Diameter: .247 in (6.3 mm) - OUR caliper measurement, per this record's Model field (FID 57). No diameter is stamped on the tool.
• Overall Length: 4-1/2 in - OUR measurement. This is not a factory marking.
• Coating: a coating is present and reads orange or bronze in the photographs. The previous entry named it TiAlN; nothing on the tool states the coating chemistry, and TiAlN is not the colour typically seen. The coating type is not established and is not asserted here.
• Material: not established. The title and the previous entry state HSS, but no material marking appears on the tool. HSS is not asserted here.
• Pilot diameter, helix angle and tolerance class are not marked on the tool and are not stated here.

Spec Basis: Verified 2026-09-16 against this tool's own photographs (KSC record 8487), cross-checked against Manufacturer (FID 56, "Generic") and Model (FID 57). The photographs confirm a two-flute piloted coolant-fed reamer with a coated cutting end and a stepped shank. The prior entry stated "Material: HSS high-speed steel" and "Coating: TiAlN" as flat specifications; neither is marked on the tool and neither was sourced, so both are now qualified. Its diameter and length are retained but labelled as our own measurements rather than published factory data.