ASNT SNT-TC-1A is the foundational standard for NDT personnel qualification in the United States and globally. With certification required by OSHA, API, ASME, and virtually every major industry, understanding SNT-TC-1A requirements is essential for launching and advancing your NDT career.
\n\nASNT SNT-TC-1A (American Society for Nondestructive Testing - Recommended Practice for Qualification and Certification of NDT Personnel) establishes minimum qualifications for NDT technicians in six methods: ultrasonic (UT), radiography (RT), magnetic particle (MPI), liquid penetrant (PT), eddy current (ECT), and visual inspection (VT). It's the most widely recognized NDT qualification standard in North America.
\n\n| Standard | \nGeographic Focus | \nCertification Body | \nLevels | \nPortability | \n
|---|---|---|---|---|
| ASNT SNT-TC-1A | \nNorth America (USA, Canada, Mexico) | \nASNT (non-profit) | \nLevel I, II, III (3 levels) | \nLimited (primarily North America) | \n
| ISO 9712 | \nEurope, Asia-Pacific, Global | \nNational accredited bodies (e.g., TWI in UK) | \nLevel 1, 2, 3 (3 levels) | \nHigh (internationally recognized) | \n
| ASNT 9712 (ASNT) | \nNorth America (alternative to SNT-TC-1A) | \nASNT | \nLevel I, II, III | \nModerate (ASNT certified alternative) | \n
| PCN (UK) | \nUK and Commonwealth countries | \nPCN (Personnel Certification Scheme) | \n1, 2, 3 | \nHigh in UK/Europe | \n
Purpose: Perform designated specific NDT tasks under direct supervision; capable of conducting routine inspections and basic measurements.
\n\nTraining Requirements:
\nExam Requirements:
\nCertification Validity: 3 years from date of certification
\n\nTypical Level I Salary: $35,000-$50,000/year
\n\nCareer Path: Entry-level inspector for basic inspections, technician work in labs, manufacturing QC departments
\n\nPurpose: Plan and conduct NDT examinations; set up equipment; perform calibration; interpret results; evaluate acceptability; work independently on routine inspections
\n\nTraining Requirements:
\nExam Requirements:
\nCertification Validity: 3 years from certification date (can be extended by demonstrating current experience)
\n\nTypical Level II Salary: $55,000-$80,000/year
\n\nCareer Path: Lead inspector on most projects; inspection authority for non-API/ASME work; consulting; training roles
\n\nPurpose: Develop and approve NDT procedures; train and certify NDT personnel; make final determination of acceptability; serve as inspection authority for critical inspections
\n\nTraining Requirements:
\nExam Requirements:
\nCertification Validity: 5 years (longer validity than Level I/II)
\n\nTypical Level III Salary: $90,000-$150,000/year (consulting: $200-$400/hour)
\n\nCareer Path: Inspection authority for critical projects; Level III consultants; procedure developers; expert witness testimony
\n\n| Certification Level | \nTraining Hours | \nOJT Hours | \nTime Required | \nExperience Path Options | \n
|---|---|---|---|---|
| Level I | \n40 hours minimum | \n300 hours or 3 months | \n3-4 months | \nEntry-level; no prior experience required | \n
| Level II | \n120 hours minimum | \n2,400 hours OR Level I + 1 year | \n1-2 years | \nOption A: 2,400 OJT hours; Option B: Level I + 1 year experience | \n
| Level III | \n150+ hours minimum | \n10,000 hours total (5 years minimum) | \n5-7 years | \nLevel II in 3+ methods + 5 years total experience | \n
Difficulty Level: Moderate to High
\nIndustry Demand: Very High (used by 95%+ of inspection companies)
\nSalary Premium: Highest demand = premium pay (+$5K-$15K above baseline)
\nCourse Duration: 40 hours (Level I), 120 hours (Level II)
\nCareer Focus: Thickness measurement (corrosion), weld inspection, flaw detection
\n\nDifficulty Level: High
\nIndustry Demand: Moderate (used in aerospace, power, nuclear heavily; oil & gas spotty)
\nSalary Premium: High (+$10K-$20K) due to licensing requirements and specialization
\nCourse Duration: 40 hours (Level I), 120 hours (Level II)
\nCareer Focus: Weld radiography, defect interpretation, safety officer roles
\n\nDifficulty Level: Moderate
\nIndustry Demand: High (aerospace, forging, automotive)
\nSalary Premium: Moderate (+$3K-$8K)
\nCourse Duration: 40 hours (Level I), 120 hours (Level II)
\nCareer Focus: Ferrous material inspection, crack detection, manufacturing QC
\n\nDifficulty Level: Moderate
\nIndustry Demand: Very High (works on all material types)
\nSalary Premium: Moderate (+$3K-$8K)
\nCourse Duration: 40 hours (Level I), 120 hours (Level II)
\nCareer Focus: Surface defect detection, aerospace, repair verification
\n\nDifficulty Level: Moderate to High
\nIndustry Demand: Moderate to High (aerospace, power generation, tube inspection)
\nSalary Premium: Moderate to High (+$5K-$12K)
\nCourse Duration: 40 hours (Level I), 120 hours (Level II)
\nCareer Focus: Tube/pipe inspection, surface crack detection, material characterization
\n\nDifficulty Level: Low
\nIndustry Demand: Extremely High (required for all inspections as baseline)
\nSalary Premium: Low (baseline credential)
\nCourse Duration: 20 hours (Level I), 60 hours (Level II)
\nCareer Focus: Borescopy, weld visual assessment, general condition evaluation
\n\nYear 1: Build Foundation
\nYear 1-2: Add Capability
\nYear 2-3: Specialize
\nYear 4-7: Advance to Level III
\nWritten Exam: 150-200 multiple-choice questions
\nPractical Exam: Hands-on demonstrations
\nPassing Criteria: 75% on written + successful practical demonstration
\n\n| Certification Path | \nTraining Cost | \nExam Cost | \nTotal First-Time | \n
|---|---|---|---|
| Level I (single method) | \na modest cost | \na modest cost | \na modest cost | \n
| Level II (one method, from scratch) | \na modest cost | \na modest cost | \na modest cost | \n
| Two methods (VT + PT Level II) | \na modest cost | \na modest cost | \na modest cost | \n
| Level III (after 5 years, per method) | \na modest cost | \na modest cost | \na modest cost per method | \n
Option 1: Retake Full Exam
\nOption 2: Maintain through Experience
\nA: Not legally required to perform NDT work, but it's industry standard. Most employers require it; many clients mandate it; career advancement is severely limited without certification. Bottom line: Get certified if you want a real NDT career.
\n\nA: Visual Inspection (VT). Shortest course (20 hours Level I), lowest exam cost (a significant capital item), fastest to pass. Then add Liquid Penetrant (PT) or Magnetic Particle (MPI) — both moderate difficulty. Save Ultrasonic (UT) and Eddy Current (ECT) for when you have more experience.
\n\nA: Yes, if you meet the experience requirements. SNT-TC-1A allows you to skip Level I IF you have 2,400 OJT hours. However, almost everyone does Level I first (it's faster and cheaper as a foundation).
\n\nA: Level I: 3-6 weeks. Level II: 3-12 months (depends on your OJT hours). Level III: 5-7 years minimum. Most companies fast-track qualified candidates through Level I-II in 1-2 years if they have solid OJT experience.
\n\nA: Yes, but it requires: (1) 5+ years total NDT field experience, (2) Level II in minimum 3 methods, (3) 150+ hours formal training, (4) Successful exam passing. It's a long process, but Level III inspectors earn $100K-enterprise tier+.
\n\nA: Recognized in North America (USA, Canada, Mexico). For international work, ISO 9712 is more portable. Many companies train for both SNT-TC-1A and ISO 9712 simultaneously.
\n\nA: You can retake anytime after your course. No waiting period. Retake cost: a modest cost per attempt. Most candidates who fail and study their weaknesses pass on the second try (85%+ second-attempt pass rate).
\n\nA: API certifications require maintaining ASNT Level III (which implies you maintain lower level certifications too). So yes, you must keep your ASNT active to keep API 510/570/653 valid.
\n\nA: Level I technician: a modest cost. Level II: a modest cost. That's a potential a modest cost annual raise — easily justifying a modest cost training investment that breaks even in 1-2 months.
\n\nA: Absolutely. Multi-certified inspectors (e.g., \"ASNT Level III UT + API 510 + ISO 9712\") are most valuable and highest-paid. Career strategy: Establish SNT-TC-1A first, then layer API, then add ISO 9712 for international mobility.
\n\nASNT SNT-TC-1A certification is the foundation of any professional NDT career. With systematic progression through Level I → Level II → Level III across your preferred NDT methods, you can build a six-figure career with global opportunities. Start with VT and PT/MPI at Level I, advance to Level II in UT for highest demand and pay, then pursue Level III and API certifications for expert authority and consulting roles.
\n\nNew to SNT-TC-1A entirely? Start with our SNT-TC-1A certification overview — what the document is, why it is an employer-based (not ASNT-issued) qualification model, and how it compares to CP-189, ISO 9712, ASNT 9712, and Canada's CGSB-derived scheme.
\n\nReady to start your NDT career? Explore our complete NDT training guide to find courses in your area, or review NDT salary data to understand your earning potential at each level.
\n","quickAnswer":{"question":"What does ASNT SNT-TC-1A 2024 require?","answer":"ASNT SNT-TC-1A (2024 edition) is the recommended practice for employer-based NDT personnel certification. It specifies minimum training hours, experience hours, vision acuity, written + practical examinations, and a Written Practice document the employer must publish. Employers' Level III signs all qualification records.","bullets":["Training hours per method (Level I/II): UT 40/40, RT 40/40, MT 12/24, PT 8/16, ET 40/40, VT 8/16","Vision: Jaeger J-1 (near) at 12 in. + Ishihara colour test annually","Written Practice: employer-specific document signed by responsible Level III"]},"updatedAt":"2028-01-17"}