AMS 6414 (SAE 4340) Round Bar: Material Profile
AMS 6414 covers premium aircraft-quality SAE 4340 steel in the form of bars, forgings, mechanical tubing, and forging stock. For round-bar orders, the exact specification revision, diameter, supply condition, and required testing control acceptance.
Vacuum consumable-electrode remelting distinguishes AMS 6414 material from general commercial 4340 and from other 4340 aerospace specifications. A 4340 grade callout alone does not establish compliance with AMS 6414.
Include all melt-source, heat-treatment, cleanliness, inspection, traceability, marking, and certification requirements from the purchase documents with the RFQ.
Key Characteristics
- Vacuum consumable-electrode remelted
- Premium aircraft-quality requirements
- Deep 4340 hardenability
- Specification-controlled traceability
Common Applications
- Aerospace shafts and axles
- High-load gears and transmission parts
- Landing-gear and actuation components
- Critical forged aerospace hardware
Ordering 4340 VAR for Production
Exact material callout
Include AMS 6414, its required revision and any additional customer specification. Keep approved-mill restrictions with the material requirement.
Bar condition and allowance
State the required supply condition, diameter, length and machining allowance. List the finished-part requirements separately from the incoming-bar requirements.
Production and documentation
Give total pounds, the first release and subsequent delivery dates. Include heat identification, testing, marking and certification requirements before quotation.
AMS 6414: Purchasing Questions
Does a 4340 certificate establish AMS 6414 compliance?
The grade designation alone does not. The purchase documents and material certification must establish the specified melt practice, quality and acceptance requirements.
Can I submit a recurring 4340 VAR requirement?
Yes. Include total program weight, release quantities, required dates and ship-to location. Source availability and the proposed release arrangement are reviewed before quotation.
Material References
References describe the material. Availability, source approvals and certification are confirmed for the specific order.
