1058HIGH TENSILE BOLTS, NUTS, AND WASHERS

- 896 - SECTION 1058 -- HIGH TENSILE BOLTS, NUTS, AND WASHERS

1058.01Description

ASTM A 325/A 325M and the modification in this Section.

563/A 563M, or ASTM A 194 and the modifications in this Section.

ASTM F 436/F 436M and the modifications in this Section.

otherwise specified.

Specification, such as those conf orming to the requirements of ASTM F 1852, may be used subject to the appr oval of the Engineer and must be tested and approved by the Departm ent before use provided that:

composition requirements of AASHTO M 164 (ASTM A 325).

specification in full-size tests.

or their equivalent, shall not be less than those provided by a bolt and nut of the same nominal dimensions described in Section 6 of the AASHTO LRFD Bridge Design Specifications.

from those of the bolts, nuts, and wa shers specified in Section 6 of the AASHTO LRFD Bridge Design Specifications.

1058.02Material Characteristics

equal to or less than 1 inch (25 mm) shall be 150,000 psi (1034 MPa). Bolts with diameters that are larger than 1 inch (25 mm) shall have a maximum tensile strength equal to 120,000 psi (827 MPa).

"weathering" steel structures. When stru ctures are painted, the bolts and the compatible nuts and washers may be Type 1 or Type 3.

galvanized), they shall be heat treated grade 10S or 10S3 (2H, DH, or DH3).

C3) with a minimum Rockwell hardness of B89 (Brinell hardness of 180), or heat treated grades 10S or 10S3 (2H, DH, or DH3).

minimum amount required for proper as sembly. The amount of overtap in the nut shall be so the nut assembles freely on the bolt in the coated condition and shall meet the me chanical requirements of ASTM Specifications as indicated for nuts in Subsection 1058.01 above. High Tensile Bolts, Nuts, and Washers 1058.03

- 897 - d. Galvanized nuts shall be lubricated with a lubricant containing a dye of any color that contrasts with the color of the galvanizing.

All bolts, nuts, and washers shall be marked according to the appropriate ASTM Specifications.

1058.03Acceptance Requirements

The minimum frequency of tests shall be as specified in ASTM A 325/A 325M.

required. If bolts are to be galvanized, tests shall be performed after galvanizing. The minimum frequency of testing shall be as specified in ASTM A 325/A 325M.

coating shall be checked by taking measurements on the wrench flats or on top of the bolt head.

accordance with Table 1058.01.

High Tensile Bolts, Nuts, and Washers

- 898 - Table 1058.01 Metric/English BoltS ubstitution Table ** Equivalent * Bolt Sizes Metric

(inches) M6 1/4 M8 5/16 M10 7/16 M12 1/2 M14 9/16 M16 5/18 M20 3/4 M22 7/8 M24 1 M27 1 1/8 M30 1 1/4 M36 1 1/2 M42 1 3/4 M48 2 M56 2 1/4 M64 2 1/2 M72 2 3/4 M80 3 1/4 M90 3 1/2 M100 4 * All bolts on any structure must be all English or all Metric. Mixing is not allowed. ** The maximum bolt hole sizes shall be as described in Section 6 of the AASHTO LRFD Bridge Design Specifications.

minimum frequency of tests shall be as specified in ASTM A 563/A 563M, or ASTM A 194/A 194M. If nuts are to be ga lvanized, tests shall be performed after galvanizing, overtapping, and lubricating.

coating shall be checked by taking measurements on the wrench flats.

ASTM F 436/F 436M. If galvanized washers are specified, hardness testing shall be performed after galvanizing. (The coating shall be removed before taking hardness measurements.)

on all plain or galvanized (after galvanizing) bolt, nut, and washer assemblies by the manufacturer or distributor before shipping.

shall be performed according to ASTM A 325/A 325M. High Tensile Bolts, Nuts, and Washers 1058.03

- 899 - (2) Each combination of bolt production lots, nut lots, and washer lots shall be tested as an assembly.

combination of lots tested.

per rotational capacity lot.

a Skidmore-Wilhelm calibrator or an a cceptable equivalent device. For bolts that are too short to be assembled in the calibrator, see Subsection 1058.03, Paragraph 4.b.(9).

equal to 10% of the minimum bolt tension (minimum bolt tension is equal to 70% of the minimum tensile load), shall be:

or equal to 4 diameters.

4 diameters and less than or equal to 8 diameters.

than 8 diameters.

continuously monitor the fastener t ension on the calibration device, the bolt torque indicated on the torque wrench dial, as well as the relative rotation of the nut with respect to the snug-tight position. After snug-tightening the nut to the appropriate tension (shown in the tables below), the nut shall be rotated until the minimum bolt tension (as shown in the appropriate table) has been reached. The bolt torque reading should be recorded as close as possible to the minimum bolt tension. This torque must be less than or equal to the calculated torque obtained from the following formula: Torque Formula Tm < T c = 0.25 PD

Where: T c = calculated torque in ft. lbs. (Newton-meters) T m = measured torque in ft. lbs. (Newton-meters) P = measured bolt tension in pounds (Newtons) D = bolt diameter in feet (meters) (values shown in tables below)

rotation of the nut should continue (past the rotation point where the minimum bolt tension-torque was taken) in the tightening direction to complete the minimum nut rotation shown in Paragraph 4.b.(6) of this Subsection. The tension reac hed at this rotation shall be equal to or greater than the turn test tension (equal to 1.15 times the minimum bolt tension). The snug tension, minimum bolt tension, and the turn test tension are shown in Table 1058.02.

High Tensile Bolts, Nuts, and Washers

- 900 - Table 1058.02 Bolt Tension Requirements SI Standard Bolt Diameter

0.016 20 0.020 22 0.022 24 0.024 27 0.027 30 0.030 36 0.036

10% Snug Tension (kilonewtons)

Minimum Bolt Tension (kilonewtons) 91 142 176 205 267 326 475

Turn Test Tension (kilonewtons) 105 163 202 236 307 375 546 US Standard Bolt Diameter (in) Diameter (ft) 1/2

0.042 5 /8

0.052 3/4

0.063 7/8

0.073 1

0.083 1 1/8

0.094 1 1/4

0.104 1 3/8

0.115 1 1/2

0.125

10% Snug Tension (kips)

Minimum Bolt Tension (kips) 51 56 71 85 103

Turn Test Tension (kips) 59 64 82 98 118

relationship as determined in Paragr aphs 4.b.(6) and 4.b.(7) of this Subsection does not meet requirements, the fastener assembly lot represented by these test samples sha ll not be used. However, if allowed by the Engineer, the complete fastener assembly lot represented by these failed test samples may be cleaned, relubricated, an d then resubmitted for evaluation.

calibrator may be tested in a steel joint using steel shims with proper hole size and thickness so as to place 3 to 5 exposed threads within the joint. The minimum turn-test tension requirement of Paragraph 4.b.(7) of this Subsection need not apply since there is no way of measuring tension. However, the torque value at proper installation rotation shall be determined as follows: The nut must be snug tightened using the same effort (or torque) required to reach the 10% snug tensio n as shown in the appropriate unit section of Table 1058.02. This "snug-torque" value may be determined by using longer bolts from the same lot that will fit in the ca librator. After match- marking the nut after snug-tightening, the nut shall be rotated to the minimum rotation required for turn-of-nut installation (equal to 1/2 of the High Tensile Bolts, Nuts, and Washers 1058.04

- 901 - rotation values shown in Paragraph 4.b. (6) of this Subsection). The torque value obtained at this installation ro tation must not exceed the torque as computed by the formula in Paragraph 4.b.(6) of this Subsection using a value of P equal to the turn test tension shown in the appropriate unit section of Table 1058.02.

required herein and in the appropriate AASHTO or ASTM Specifications shall be recorded on the appropriate document.

shall be reported on the appropriate document.

manufacturer or distributor that perfo rms the tests shall certify that the results recorded are accurate. Recent calibration documentation (calibrations performed at least on a yearly basis) for testing machines, as well as torque and tension measuring equipment used for performing said tests, shall be provided upon request by the Engineer.

1058.04Documentation

manufacture of bolts, nuts, or washers.

and manufactured.

test reports (MCTR) for the item furnished.

according to Subsection 1058.03.

include on the MCTR:

Subsection 1058.03, Paragraph 4.b.(3).

Paragraph 4.b. .

Paragraph 5.b.

Specification and the appropriate ASTM Specification.

manufactured.

High Tensile Bolts, Nuts, and Washers

- 902 - 3. Distributor Certified Test Report(s) DCTR:

components.

(in lieu of a manufacturer) and reported on the DCTR.

Subsection 1058.03, Paragraph 4.b.

1058.05Shipping

shipped in the same container. If there is only one production lot number for each size of nut and washer, the nuts and washers may be shipped in separate containers. The container shall be permanently marked with the rotational capacity lot number such that identification will be possible at any stage before installation.

Engineer for acceptance before installation.

- 903 - SECTION 1059 -- ZINC COATING ON HARDWARE

1059.01Description

hardware not otherwise covered, such as bolts, nuts, screws, nails, fittings, and other miscellaneous general hardware.

1059.02Material Characteristics

requirements of ASTM A 153 or mechanically coated to conform with AASHTO M 298, Class 50.

1059.03Acceptance Requirements

Specification and those in the Department’s Materials Sampling Guide .