ASTM F3148 (TNA® Torque-And-Angle Fastening System)

High Strength Structural Bolt Assemblies, Steel and Alloy Steel, Heat Treated, 144ksi Minimum Tensile Strength, Inch Dimensions

The ASTM F3148 (Also known As TNA® Fastening System) specification cover chemical, dimensional, physical and mechanical requirements for quenched and tempered bolts manufactured from steel and alloy steel, in inch dimensions. The bolts are available as structural bolting assemblies which include a fixed spline bolt, a suitable nut and at least one washer covered by reference herein.

Assemblies supplied under this specification, are intended for use in structural connections covered in the Specification for Structural Joints Using High-Strength Bolts and installed using the torque-and-angle or part turn/combined installation method.

Torque-and-Angle Fixed-Spline Structural Bolting Assembly
A fastener assembly comprised of a torque-and-angle fixed-spline bolt with a suitable nut and at least one washer, installed and tightened using a special electric wrench and socket system which has an inner socket that engages the fixed-spline end of the bolt and with an outer socket that engages and turns the nut, in two separate and distinct operations, the first is a controlled torque application and the second is a specified angle.

Combined Method
A tightening method comprised of two steps, the first tightening step using a torque regulating tool and the second tightening step in which a specified turn is applied to the turned part of the assembly. Also known as the ‘part turn method’.


How The System Work


Kegs & Skids Quantities

Required Tools

Precision. Accuracy. Repeatability.

TAE Series tools are designed for use exclusively as part of the TNA® Torque + Angle Fastening System. Through applied Torque for the snug operation and Angle (nut rotation) for the final tensioning operation the TAE Series tools provide control and accuracy unmatched by any other system on the market.

Specs and Features

  • Accuracy +/- 5% Torque Mode +/- 10oAngle Mode
  • Lightweight and durable
  • No reaction to the operator
  • Immediate operator feedback
  • Safe no reaction point design
  • Convenient 110VAC input power

Digital Torque Meters

The in-line Digital Torque Meters are designed to give you immediate feedback about the tools output torque. The device can be used to validate the calibrated torque setting during pre-installation testing or at any time the output of the tool needs to be verified.


  • Digital display showing torque output
  • SD Card slot
  • Battery powered
  • Protective rubber boot