A-A-435 Clamp, Screw, Quick Adjusting, Threaded Head

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A-A-435D

January 8, 1988

SUPERSEDING

A-A-435C

April 1, 1983

COMMERCIAL ITEM DESCRIPTION

CLAMP, SCREW, QUICK-ADJUSTING (THREADED HEAD)

The General Services Administration has authorized the use of this

Commercial Item Description in lieu of Type III, Class C, Federal

Specification GGG-C-406.

This description establishes requirements for a threaded head quick-adjusting screw clamp used for clamping and holding work in a fixed posistion. Assigned NSN 5120-00-329-3298.

Salient characteristics:

Stationary head:

1. Malleable iron; furnished with adjusting jaw face- 1-3/4 x 1-3/4 inches + 1/8 inch.

2. Driven by a crank through a screw.

3. Head shall screw on 3/4 �inch threaded pipe. The shall contain two holes which are substantially parallel to each other. One hole shall have a 5/8-inch, right-hand, hole shall be counterbored and threaded to receive a 3/4-inch iron pipe. The counterbore shall have a minimum diameter of 1.060 inches for approximately one-half the depth of the hole and the remainder of the hole shall have 3/4-14 NPT threads.

4. Screw, steel, 5/18 inch diameter minimum, right-hand, square or Acme threads. All surfaces of the clamps shall have a smooth finish with all edges rounded or beveled and shall be thoroughly cleaned and free of all foreign matter, fins, scale, flux, or any other imperfection. The screw shall provide a travel of not less than 1-1/2 inches to the adjustable jaw.

Adjustable head:

1. Malleable iron; fits on 3/4-inch pipe.

2. 1-3/4 x 1-3/4 inch face, + 1/8 inch.

3. Slides on pipe with mechanical locking device.

4. A hardened steel plate or other device shall be provided to prevent excessive wear where the end of the screw bears on the adjustable jaw.

Illustration. The clamp shall be similar to the illustration shown below.

DISTRIBUTION STATEMENT A. Approved for Public Release; Distribution is Unlimited.