Vintage Jacobs No. 14N heavy-duty ball-bearing Super Chuck mounted on a No. 4 Morse taper arbor, with chuck key.

Chuck identification:

- Manufacturer: Jacobs

- Model: No. 14N

- Type: Heavy-duty ball-bearing Super Chuck

- Capacity: 0-1/2" / 0-13 mm

- Chuck mounting taper: No. 3 Jacobs taper / 3JT

- Chuck construction: Keyed, three-jaw

- Country marking: Made in USA

Arbor identification:

- Machine taper: No. 4 Morse taper / MT4

- Chuck end: No. 3 Jacobs taper / 3JT

- Tang: Present

- Manufacturer marking: Jacobs

Included:

- Jacobs No. 14N Super Chuck

- No. 4 Morse taper to No. 3 Jacobs taper arbor

- Chuck key shown

The chuck and arbor show normal evidence of prior machine-shop use, including scratches, spotting, discoloration, residue, light oxidation, and handling marks. The sleeve and gear teeth show prior key engagement and use. The three jaws appear intact and aligned in the photographs.

The arbor has scratches and contact marks from prior installation and removal. A visible edge nick is present near the larger chuck-end shoulder. Please review the close photographs for exact condition.

No powered drilling test was performed. The assembly was not installed in a machine spindle, and no gripping-force, runout, taper-fit, or load test was performed. Current accuracy and operating condition under load are unknown.

The buyer receives the exact pictured chuck, mounted arbor, and chuck key. No case, drift, drill bits, machine spindle, or additional tooling is included.