AASHTO M 269-96 pdf free download

AASHTO M 269-96 pdf free download.Turnbuckles and Shackles.
3.1.2. Shackles- Each shackle, together with its pin or bolt, shall be forged at elevated temperature for final shape and size, in conformance with M 102M/M 102, Class AH. 3.2. Construction: 3.2.1. Turnbuckles: 3.2.1.1. Method- Each turnbuckle body and each end pull shall be forged at elevated temperature to final shape and size. 3.2.1.2. Size- -Turnbuckles covered by this specification shall be furnished in the sizes shown in Table 3, clear opening between heads, as specified. The size of turnbuckle bodies shall be the nominal major diameter of the threads in the heads and the clear opening between heads (which is approximately equal to the take-up); thus, for a 19-by- 152-mm (3/4-by-6-in.) turnbuckle body, the heads shall be threaded for a 19-mm (/4-in.) nominal major-diameter end pull, and the clear opening between heads shall be 152 mm (6 in.). The difference between the actual clear opening in the turnbuckle body and the nominal value given in Table 4 for the size specified shall not exceed 5 percent of the nominal value.
3.2.1.3. Length of Head—The length of the heads of the turnbuckle bodies shall be not less than 1.5 times the nominal outside diameter of the end pull for sizes up to 31.8 mm (11/4 in.), and 1.25 times for sizes 31.8 mm (11/4 in.) and above.
3.2.1 .4. Thread—Turnbuckle bodies and end pulls shall be threaded after fabrication to final size and shape. The threads in the heads of the turnbuckle bodies and on the end pulls shall comply with NIST H28 (National Institute of Standards and Technology Specification H28, Screw-Thread Standards for Federal Services). Unified threads in the coarse (UNC) standard series (Table 5) should be used. If the standard diameter—pitch combinations are not suitable, the UNS threads with dimensions in accordance with NBS H28 should be used. Threads on the finished tumbuckle shall not be looser than Class 1 All B fit. The female threads on the tumbuckle body may be oversized as necessary, so that after coating they will properly mate (not looser than Class IA/I B fit) with the standard-size male threads of the end pulls. The thread in one head of each turnbuckle body shall be right-hand and in the other head left-hand. The threads on the end pulls shall be great enough so that the ends of the end pulls can be brought into contact with each other at the middle of the body length when jam nuts are not used.
3.2.1.5. Breaking Strength—The breaking strength of turnbuckles, equipped with end pulls, shall be not less than the value given in Table 2 for the required size, type, and form of end pull specified.
3.2.1.6. Turnbuckle Bodies, Types—Open turnbuckles shall be forged as specified. Forged turnbuckle bodies shall be similar to Figure 1. They shall be forged as specified. The shape of the head of the turnbuckle body shall be either round or hexagonal.3.3.1. Surface Condition- -Turnbuckle bodies and end pulls shackles shall be finished by grinding the flash smooth, where required, and removing the loose scale. They shall be free of cracks, flaws, seams, and other injurious imperfections. 3.3.2. Zinc Coating- Turmbuckles and shackles and accessories shall be galvanized (zinc coated) by the hot-dip process. The hot-dip process shall be applied in conformance with M 232M/M 232, and shall be adherent, smooth, and free from injurious lumps, blisters, dross, or flux. Coating shall be done on the end pulls and threaded pins after threading; coating for turnbuckle bodies, shackles and jam nuts may be done before or after tapping at the option of the purchaser.AASHTO M 269-96 pdf download.