Magnaflux Magnetic Particle Test Bar

Magnaflux Magnetic Particle Test Bar

Contains Coarse and Fine, Surface and Subsurface Defects in Both Directions


The Magnaflux Magnetic Particle Test Bar is used as a test piece with artificial flaws, to establish field direction and determine adequate current levels using AC or DC currents in wet horizontal magnetic particle bench units, power packs, or magnetic yokes. The bar contains both fine and coarse defects, surface and subsurface defects and longitudinal and transverse indications for use with AC, HWDC, and FWDC magnetizing currents. As required in some specifications, this bar may be used to determine that the MPI procedure has the ability to detect a 1/16" x 0.006" x 0.01" (LxWxD) notch (maximum dimension) oriented 90° to the magnetic flux. It is made of low alloy steel and is filled flush with a non-conducting material to prevent mechanical holding of the magnetic particles.


Position test bar in magnetizing equipment

  • Wet bench equipment: Clamp bar between head and tail stock
  • Power pack equipment: Use contact clamps to attach cables to test bar or place test bar inside cable wrap coil

Magnetize test bar according to the table on the right. Apply particles to form indications. AC fields will detect surface flaws. HWDC and FWDC fields will detect subsurface flaws. For yoke magnetization, position yoke legs on either end of the test bar. Magnetize and apply particles to form transverse indications.


Waveform Field Direction Minimum Amperage Indications
AC (Wet) Circular Head Shot 160 A Lengthwise
Longitudinal Coil Shot 450 A Transverse
HWDC / FWDC Circular Head Shot 400 A Lengthwise
Longitudinal Coil Shot 780-890 A Transverse

Technical Specifications

Magnetic Particle Test Bar Specifications

Dimensions 10.0" x 1.25" x 0.375"
Surface Flaws Top Side Lengthwise LxWxD: 2.0" x 0.005" x 0.040"
Transverse LxWxD: 0.063" x 0.005" x 0.020"
Surface Flaws Bottom Side Lengthwise LxWxD: 0.062" x 0.005" x 0.020"
Transverse LxWxD: 1.25" x 0.005" x 0.020"
Subsurface Flaws Transverse 0.064" diameter x 0.75" deep holes
1. 0.051" from surface
2. 0.061" from surface
3. 0.071" from surface
4. 0.081" from surface
5. 0.091" from surface
6. 0.131" from surface
Subsurface Flaws Lengthwise 0.064" diameter x 1.75" deep hole
0.093" from surface

Specification Compliance

Magnetic Particle Test Bar Compliance

For use with systems conforming to:

  • NAVSEA T9074-AS-GIB-010/271
  • ASME BPVC Section V Article 7
  • ASTM E709
  • ASTM E1444
  • ASTM E3024
Description Part # Saved Price Select Option Add to
Magnaflux Magnetic Particle Test Bar MT-MX-189838 $901.00
MX Industrial MPI Test Bar (189838 equivalent) MT-MXI-MX3508 $901.00 $857.00