HIGH STRENGTH / NON–HIGH STRENGTH FASTENERS

 

GENERAL

 

This IM covers the approval, certification and acceptance of high strength and non-high strength fasteners. The requirements for high strength and non-high strength fasteners can be found in Standard Specification 4153.06.  Anchor bolts are covered in IM 453.08.

 

HIGH STRENGTH FASTENERS

 

       High strength fasteners are defined and listed in 4153.06 B, 1:

 

MANUFACTURER APPROVAL

 

Prior to furnishing high strength fasteners on a certification basis, the following documents shall be submitted:

 

1.    A request shall be submitted to the Construction and Materials Bureau in Ames, Iowa detailing the location of the manufacturing plant and any distribution center(s).

 

2.    Quality control plan/procedures the company has established to ensure material quality and identity through the manufacturing process as well as quality control testing.

 

3.    A typical example of certification documents the mill will furnish.

 

4.    Copy of an identification list, invoice or bill of materials providing the information identified in the Certification Procedures.

 

Upon satisfactory review of this application, the manufacturer will be placed on the Materials Approved Products Listing Enterprise (MAPLE) in IM 453.06B Appendix D.

 

       CERTIFICATION PROCEDURES

      

• The manufacturer of high strength bolts, nuts and washers shall furnish an identification list, invoice or bill of lading for each shipment to each project.  It shall show the project, design number, heat number, hardness, tensile and yield strengths, proof load, zinc coating methods and measured coating thickness, galvanization bath temperature, rotational capacity test results, source and number and weight of pieces in the shipment and contain a certification statement indicating the attached mill test reports and galvanization certifications represent the itemized material.

In addition, the name and location of the galvanization plant must be shown.

• The signed mill test reports/certification shall include the chemical and heat analyses, and type for each heat. 
• The signed mill test reports/certification shall also include a statement indicating the steel meets the requirements of IM 107, Group 1, Buy America.
• The manufacturer of high strength bolts, nuts and washers shall furnish a certification with a statement indicating the nuts, bolts and washers meet the applicable specifications.

 

A copy of these documents is required for each shipment to a project and shall be provided to the Project Engineer and the District Materials Office responsible for project administration or warehouse stock monitoring.

 

ACCEPTANCE

 

Acceptance of high strength fasteners will be based on complying verification test samples and certification documentation as indicated above.

 

All fastener are to be delivered in marked containers clearly labeled with the fastener manufacturer, component size, ASTM designation and Lot numbers.

 

Approved sources of high strength fasteners are found in the Materials Approved Products Listing Enterprise (MAPLE) in IM 453.06B Appendix D.

 

Galvanized high strength fasteners require an Iowa DOT thickness test report but are not required to be from an approved galvanizer.

 

VERIFICATION SAMPLING & TESTING

 

High Strength Fasteners (Bolt, Nut & Washer)

 

                                       Bolts                                                      Nuts & Washers

 

                                                      Min. No.                                                                Min. No.

            No. of Pieces in                 Sampled                      No. of Pieces                    Sampled

            a Production Lot                & Tested                      in a PO Lot                        & Tested

 

            800 and under                        1                             800 and under                          1

            801 to 8,000                           2                             801 to 8,000                             2

            8,001 to 35,000                      3                             8,001 to 22,000                        3

            35,001 to 150,000                  8                             Over 22,000                             5

            150,001 and Over                13

 

A copy of the Manufacturer-Certified Test Report, Mill Test Report and rotational capacity test must be forwarded with the sample as appropriate.

 

Rotational capacity testing will be in accordance with IM 391 for Long Bolts in Tension Calibrator and IM 392 for Bolts Too Short to Fit in Tension Calibrator. 

 

Fasteners which fail to meet the requirements of any specified ASTM Specification shall be rejected or, at contractor option, will be re-sampled and tested at two times the original rate. All additional samples shall conform to the specifications or the production lot will be rejected.

 

If a project quantity is less than 100 fastener assemblies (bolts, nuts, or washers), the District Materials Engineer may, without sampling, accept the small quantity lot on a basis of Manufacturer-Certified Test Report Certification.

 

Fabrication Inspector 2’s are only responsible for sampling bolts used for shop assemblies. District Materials are responsible for sampling bolts used for field assemblies.

 

NON-HIGH STRENGTH FASTENERS

 

Fasteners that are not defined as high strength are considered non-high strength.

 

See IM 453.07 for approval and acceptance of stainless steel fasteners.

 

There is not an approved list for non-high strength fasteners and they do not require the following:

·           Manufacturing form an approved source

·           Galvanizing from an approved source

·           Galvanizing bath temperature

·           Verification sampling, testing or the associated test reports.

 

       CERTIFICATION PROCEDURES

      

• The manufacturer of non-high strength bolts, nuts and washers shall furnish an identification list, invoice or bill of lading for each shipment to each project.  It shall show the project, design number, heat number, hardness, tensile and yield strengths, proof load, zinc coating methods and measured coating thickness, source and number and weight of pieces in the shipment and contain a certification statement indicating the attached mill test reports and galvanization certifications represent the itemized material.

In addition, the name and location of the galvanization plant must be shown.

• The signed mill test reports/certification shall include the chemical and heat analyses, and type for each heat. 
• The signed mill test reports/certification shall also include a statement indicating the steel meets the requirements of IM 107, Group 1, Buy America.
• The manufacturer of non-high strength bolts, nuts and washers shall furnish a certification with a statement indicating the nuts, bolts and washers meet the applicable specifications.

 

A copy of these documents is required for each shipment to a project and shall be provided to the Project Engineer and the District Materials Office responsible for project administration or warehouse stock monitoring.

 

       ACCEPTANCE

 

Acceptance of non-high strength fasteners will be based on certification documentation as indicated above.