A-A-50968
11 June 1984
COMMERCIAL ITEM DESCRIPTION
CHUCKS, DRILL, KEYLESS TYPE, THREE JAW, BALL BEARINGS
The General Services Administration has authorized the use of this commercial item description in preference to the Type 11 chucks covered by Federal specification GGG-C-350.
This description covers keyless type, three jaw chucks which are designed to hold straight shank tools within the capacity of the chuck. These chucks are used on high accuracy drill presses, jig borers, and milling machines where frequent drill changes are required.
Salient characteristics.
Classification. The drill chucks covered by this description shall be of the following types and of the sizes specified in table I or table II. The type and size chuck required for a specific requirement shall be as specified in the contract or order.
Type I- Tapered mount
Type II- Threaded mount
Sizes and capacities. The type I and type II drill chuck shall meet the size and capacity requirements of table I or table II.
Design. The drill chucks covered by this CID shall be of the latest design, easy to operate and entirely adequate for gripping various sizes of straight shank tools.
Hardened jaws. The gripping surfaces of the jaws shall have a Rockwell C scale hardness value of not less than 52.
Hardened bore. The taper mount bore (Type I) shall be hardened in accordance with the manufacturer’s standard practice and shall conform to the dimensional requirements of table I.
Threads. Type II (thread mount) drill chucks shall have right-hand threads in the mount hole which shall meet the requirements of table II for the chuck size specified. All threads shall conform to FED-STD-H28.
Bearings. Thrust bearings used in the chuck shall be of a type and class to provide the necessary accuracy required.
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