ASTM A512:17 pdf download

ASTM A512:17 pdf download.Standard Specification for Cold-Drawn Buttweld Carbon Steel Mechanical Tubing.
10.3.2 A square, equipped with direct-reading vernier, may be used to determine the angular deviation which, in turn. may be related to distance to inches.
10.4 Twist Tolerance—Variation in twist for square and rectangular tubing shall not exceed the amounts prescribed in Table 8. The twist in square and rectangular tubing may be measured by holding one end of the tubing on a surface plate and noting the height of either corner of the opposite end of same side above the surface plate. Twist may also be measured by means of a beveled protractor equipped with a level. The angular deviation is measured on opposite ends or at any point throughout the length.
10.5 Length—Random lengths between acceptable limits will be furnished, utilizing the full mill length. Tubing will be cut in half if specified. Full length random tubing will have a spread not exceeding 7 ft (2.1 m). Half-length random tubing will have a spread not exceeding 4 ft (1.2 m). Not more than l() % of the total footage of a shipment may he furnished in lengths shorter than the minimum specified, hut not less than 6 ft (1.8 m).
10.5.1 When specified, multiple lengths will be furnished and should include allowances made for the customer’s cutting tool width and grippage. Maximum and minimum lengths may be specified with the understanding that not more than 10 % of the total footage in a shipment may be furnished in individual multiples cut to the customer’s specifications.
10.5.2 Variations from the specified length shall not exceed the amounts prescribed in Table 9.
10.6 Straightness—The straightness tolerance for square and rectangular tubing shall be ‘/io in. in 3 ft (1:576).
11. Workmanship, Finish, and Appearance
11. 1 Tubes shall have a surface finish compatible with the conditions (Section 5) to which the tubes are ordered.
11.2 Special surface preparations as may be required for specific applications are not within the scope of this section. Such requirements shall he considered under the supplementary or basis of purchase provisions of this specification, and details shall be provided in the purchase order.
11 .3 The tubing shall be free of injurious defects and shall have a workmanlike finish. Surface imperfections such as handling marks, straightening marks, light die marks, or shallow pits are not considered injurious.
16. Packaging
16.1 Civilian Procurement- The manufacturer, at his option, will box, crate, carton, package in secured lifts, or bundle to ensure safe delivery. Special packaging requiring extra operations other than those normally used by the manufacturer must be specified on the order.