Parker Research DA-400 AC/DC Yoke

Parker Research DA-400 AC/DC Yoke

The Recommended Yoke for Welding Inspection, Highest Lift Strength at 50 lbs (DC) and 20 lbs (AC), Weighs 9 lbs, Top Mounted Thumb Switch and 1.3"W x 1.3"H Handle Dimensions. Made in the USA

 The Perfect Yoke for Welding Inspection

The Parker DA-400 Contour Probe is the most powerful AC/DC Magnetic Particle Yoke in its class, boasting a 50 lb lift strength, and is perfect for welding applications. It features a rugged, high-impact-molded housing and can be used with either dry powder or wet fluorescent materials. The AC mode produces an intense AC field, for detection of surface defects and demagnetizing after inspection, and the DC mode produces an intense Half Wave Rectified DC field, for detection of some sub-surface defects. Like it's predecessor, the DA-200, it also features Parker's trademark flexible, fully-adjustable leg design, which allows the field to be focused at a precise area of inspection regardless of part size or mass.


Key Differences

  • Perfect for AWS Welding Applications
  • Highest Lift Strength - 50 lbs


  • Very high lift strength - 50 lbs in DC mode
  • Constant AC or pulsed DC fields with the flip of a switch, for the location of surface and some sub-surface defects
  • Apply continuous or residual magnetic fields and demagnetizes too
  • Use with dry powder, wet fluorescent or visible
  • High impact molded housing
  • One year repair/replacement guarantee

Applications Include

  • Field Testing
  • Spot Inspections
  • In-service Inspections
  • Demanding Environments
  • Welding Inspections
  • Defect examples include: Inclusions, Seams, Shrink Cracks, Tears, Laps, Welding Slags, Grinding Cracks and more

Technical Specifications

DA-400 and DA-400S Specifications

Weight 9 lbs (4.1 kg)
Electrical Requirements

DA-400: 115VAC - 50/60 Hz: 6 amps

DA-400S: 230VAC - 50/60 Hz: 3 amps

Lift Strength AC - 20 lbs / DC - 50 lbs
Switch Placement Top Mounted
Handle Dimensions 1.3"W x 1.3"H
Leg Span 0" - 12" (0 - 304.8 mm)
Cord Length 10' (3.048 m)
Duty Cycle 50%
Construction High-impact, glass-filled nylon housing

CE Certification available for DA-400S

Kits Include

Steel Case Kit A Includes:

  • Steel Carrying Case
  • 1 lb. Red Powder
  • 1 lb. Gray Powder
  • PB-1 Powder Blower

Plastic Case Kit A Includes:

  • Super Tough Plastic Carrying Case
  • 1 lb. Red Powder
  • 1 lb. Gray Powder
  • PB-1 Powder Blower

All Parker Research A/B Kits have been discontinued by the manufacturer.
Kit A remains available. If wet fluorescent magnetic particles and a UV lamp are required, we suggest the following:

Mi-Glow 778S-RTU and FL-200 Handheld UV Flashlight

Product Literature

Description Part # Saved Price Select Option Add to
Parker Research DA-400 AC/DC Yoke, 115VAC MT-PR-DA400 $572.00
Parker Research DA-400S AC/DC Yoke, 230VAC MT-PR-DA400S Request Pricing
Parker Research A-448 48VAC (Export) MT-PR-A448 Request Pricing
Parker Research Steel Case Kit A - Includes Steel Carrying Case, 1 lb. Red Powder, 1 lb. Gray Powder and PB-1 Powder Blower MT-PR-A-KIT $182.00
Parker Research Plastic Case Kit A - Includes Super Tough Plastic Carrying Case, 1 lb. Red Powder, 1 lb. Gray Powder and PB-1 Powder Blower MT-PR-PL-A-KIT $134.00
Parker Research Y-400 Yoke Light for DA-400 Series & B-100 Series Contour Probes MT-PR-Y400 $43.00
Parker Research Small Rugged Plastic Carrying Case for Magnetic Particle Yokes MT-PR-C-CASE $51.00
Replacement Bulb for Parker Research B300 Series AC Yokes MT-PR-Y34B $3.75
Parker Research Large Rugged Plastic Carrying Case for Magnetic Particle Yokes MT-PR-PL-CASE $103.00
CE Certification for Parker Research DA-400 Series MT-PR-CE-DA400 Request Pricing