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Jacobs 16N 5/8" Super Ball Bearing Drill Chuck. Excellent. New Arbor & Key., US $120 – Picture 0
Jacobs 16N 5/8" Super Ball Bearing Drill Chuck. Excellent. New Arbor & Key., US $120 – Picture 0

Jacobs 16n 5/8" Super Ball Bearing Drill Chuck. Excellent. New Arbor & Key.

US $120

  • Fairfield, Pennsylvania, United States
  • Jun 12th
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Jacobs Model 16N Ball Bearing Drill Chuck.   5/8” Capacity.  An original Jacobs classic --Made in the USA.   Includes new arbor and Jacobs K4 key.     The chuck being offered for sale is shown in the photos with the blue background. The other photos provide general, supplementary information. Includes one new arbor of buyer's choice  -- MT #2,  MT #3,  MT #4,  Straight 5/8", or Straight 3/4". [ Arbors are house brands [Phase II, TTC, etc.] of major industrial suppliers such as MSC and Travers Tool Company. ] CAPACITY.   Meets or exceeds Jacobs original specs  -- will grip bits as large as 5/8" and smaller than 5/64". CONDITION.   Excellent. Chuck has been disassembled, cleaned, and inspected. Jaws have been lapped on a diamond plate to ensure they are straight, flat, and parallel. Chuck has been tested for accuracy with a 3/8" diameter test bar by measuring the TIR at two points:  [1] at the tip of the jaws and [2]  3-1/2" out from the tip of the jaws.  Jacobs' standard for their new ball bearing chucks is TIR not greater than .003". On my gaging setup, this chuck is now more precise than Jacobs’ accuracy standard for their new chucks.   Sliding surfaces were lubed with Superlube, teflon-impregnated grease;  ball bearings were lubed with Mobil 1 synthetic gear oil  [75~90 weight]. GUARANTEE.    If buyer is not satisfied that this chuck is as good as pictured and described in this eBay ad, I ask that the buyer return it undamaged, and I will immediately refund all of the money sent.  Period  -- no quibbling. SHIPPING. Shipped by USPS Priority Mail, carefully packed and fully insured. Cost: $14. When buyers buy two or more chucks at the same time, I combine the shipping and refund any overpayment for shipping.  SOME BACKGROUND.  I'm an old guy [78] blessed with good enough health that I can work a few hours daily.   Now that Jacobs ball bearing chucks are made in China, I concentrate on restoring the original chucks that were made by American craftsmen.  In recent years, I've restored more than 100 Jacobs Ball Bearing chucks.

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