A-A-50212A
18 May 1988
SUPERSEDING
A-A-50212
July 28, 1983
COMMERCIAL ITEM DESCRIPTION
PARALLEL, RULER
The General Services Administration has authorized the use of this commercial item description in preference to Federal Specification GG-P-118.
This description covers stepping or folding parallel rulers used in general drafting and navigation to draw and lay out parallel lines.
Salient characteristics:
Design: The parallel rulers shall consist of two parallel blades linked together by two or three bars. The blades shall have knobs to facilitate spreading and friction pads on the undersides (see figure 1).
Material
Metal – Chrome plated brass, anodized aluminum, or corrosion-resisting steel. (Only one of the listed metals shall be selected. Combination of metals is not allowed. The selected metal shall be compatible with the selected hardwood and plastic).
Hardwood – Straight-grained, seasoned; moisture content 6-14 percent.
Plastic – Molded styrene-butadiene
Class.
1 – Wood – The blade shall be one continuous piece of hardwood.
2 – Plastic – The blade shall be one continuous piece of plastic.
Part number: The document part number for the parallel ruler shall be as follows:
A50212 – X – X
A50212 = CID identification number
X = Class 1 or 2
X = Size 06, 12, 15, 18 or 24
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
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