DLA A-A-50685-1989 LEVEL PRECISION MASTER SINGLE FACE《单面精度标准水平仪》.pdf

1、COMMERCIAL ITEM DESCRIFTION LEVEL, PRECISION PVLASTER, SINGLE FACE The General Services Administration has authorized . the use of this commercial item description as a replacement for Type IX, class 1, single face, precision master level in superseded specification GGG-L-BllC. 1. SCOPE. 1.1 other l

2、evels. This commercial item description covers a single face, precision master level used to calibrate 2. REQUIREMENTS. The item shall be made of steel or close grain cast iron of a design to 2.1 preclude warping or deflection due to temperature change. It shall also consist of a single faced stock,

3、 one adjustable level vial, one fured cross test vial, a vial holder, a cover and a case. The vial shall have a cover or top plate of heavy nonferrous metal or plastic to shield vials from heat of operators hand. It shall be 15 inches long and have vial accuracy of 0.0005 inches per foot of single f

4、aced stock, Concavity and convexity of single faced stock shall not exceed 0.0002 inches per foot. The vial shall be a glass tube with a vial sensitivity of 10 seconds, maximum. The vial shall have no less than three auxiliary lines, permanently marked, spaced 1/10 inch apart on both sides of both b

5、ubble defining lines. The angular value of these lines in either degrees or inches per foot shall be permanently marked on the level. 2.2 Workma- The level, including all parts and accessories, shall be free from burrs, rust, external sharp or rough edges, imperfections, and any other defects which

6、may impair serviceability, durability, appearance, or operational performance. 3. QUALITY ASSURANCE. 3.1 certif- The contractor shall certify that the product offered meets the salient characteristics of this description and that the product conforms to the producers own drawings, specifications, st

7、andards and quality assurance practices, and is the same product offered for sale in the commercial marketplace. The government reserves the right to require proof of such conformance prior to first delivery and thereafker as may be otherwise provided for under the provisions of the contract. 4. PRE

8、PARATION FOR DELIVERY. 4.1 preservation. Packaging. Packing and Markin?, Preservation, packaging, packing, labeling, and marking shall be as specified in the contract or order. MILITARY INTEREST: Custodians: Air Force - 99 Preparing activity Air Force - 04 Project No: 5220-F217 DISTRIBUTION STATEMENT A:. Approved for public release; distribution is unlimited. - , THIS DOCUMENT CONTAINS / - PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-