CFS Aerospace & Automotive Standards 2 — Questions and Answers
Question 1: Which NAS (National Aerospace Standard) series covers close-tolerance bolts used in aerospace shear applications?
- NAS 1103
- NAS 6604 (Correct answer)
- NAS 464
- NAS 1580
Correct answer: NAS 6604
NAS 6604 series covers close-tolerance hexagon head bolts used in aerospace shear-critical joints.
Question 2: In automotive fastener standards, what does SAE J429 Grade 8 require for proof load stress?
- 85,000 psi
- 100,000 psi
- 120,000 psi (Correct answer)
- 150,000 psi
Correct answer: 120,000 psi
SAE J429 Grade 8 bolts must meet a proof load stress of 120,000 psi.
Question 3: ASTM F2281 covers stainless steel bolts and studs intended for use at elevated temperatures. What is the primary concern addressed?
- Corrosion resistance
- Stress relaxation at high temperature (Correct answer)
- Magnetic permeability
- Thread galling prevention
Correct answer: Stress relaxation at high temperature
ASTM F2281 specifically addresses stress relaxation behavior of stainless fasteners under elevated temperature service conditions.
Question 4: Which aerospace standard governs the requirements for self-locking nuts used on aircraft structures under AS9100 quality systems?
- MIL-DTL-17828
- MIL-N-25027 (Correct answer)
- NAS 1021
- AN 365
Correct answer: MIL-N-25027
MIL-N-25027 covers self-locking nut requirements including prevailing torque values for aerospace structural applications.
Question 5: The AIAG (Automotive Industry Action Group) standard for measurement system analysis is referenced in fastener quality programs. What does MSA stand for?
- Material Specification Audit
- Measurement System Analysis (Correct answer)
- Manufacturing Standards Approval
- Metric Standard Assessment
Correct answer: Measurement System Analysis
MSA stands for Measurement System Analysis and evaluates gauge repeatability and reproducibility in automotive quality systems.
Question 6: Under Boeing Material Specification (BMS), what coating is typically specified on titanium fasteners to prevent galling during installation?
- Cadmium plating
- Dry film lubricant (PTFE-based) (Correct answer)
- Zinc phosphate
- Electroless nickel
Correct answer: Dry film lubricant (PTFE-based)
Titanium fasteners in Boeing specs typically require a dry film lubricant such as PTFE to reduce galling during installation.
Question 7: SAE AS1515 specifies requirements for which type of aerospace fastener installation tooling?
- Torque wrenches for structural bolts
- Rivet guns for solid rivets
- Power tool drivers for swaged collar fasteners (Correct answer)
- Nutrunners for wheel fasteners
Correct answer: Power tool drivers for swaged collar fasteners
SAE AS1515 covers power installation tools used for swaged or pulled collar fasteners such as Hi-Lok and lockbolts.
CFS Aerospace & Automotive Standards 2
Which NAS (National Aerospace Standard) series covers close-tolerance bolts used in aerospace shear applications?