13-8Mo Stainless Steel Bar (AMS 5629)

Arch Metals supplies 13-8Mo stainless steel bar from Dallas, Texas, for aerospace and defense customers across Texas and the surrounding states. 13-8Mo (often written PH13-8Mo) is a precipitation-hardening stainless steel that reaches very high strength while keeping good toughness and stress-corrosion resistance. We supply 13-8Mo bar to AMS 5629 and ASTM A564 Type XM-13 with certified material and saw cutting to length. Request a quote and we’ll confirm sizes and availability.

13-8Mo Stainless Steel Forms

  • Round bar, Condition A (solution treated)
  • Bar aged to H950 through H1150 on request
  • Forging stock on request

Size availability changes with mill supply. Send us your sizes through our quote request form and we’ll confirm stock, lead time and pricing.

Stacked steel round bars, representative of 13-8Mo stainless steel stock

13-8Mo Stainless Steel Conditions and Specifications

  • Condition A bar (AMS 5629, ASTM A564 XM-13): solution treated for machining, then aged to the required strength.
  • Aged conditions H950 to H1150 (AMS 5629): H950 and H1000 give the highest strength; H1050 and above improve toughness and stress-corrosion resistance.
  • Melting practice (VIM/VAR): 13-8Mo is double vacuum melted for very low inclusion content and consistent through-thickness properties.

Not sure which condition or specification your drawing calls for? Send us the print requirements and we’ll match the material.

Typical Properties of 13-8Mo Stainless Steel (H1000)

  • Ultimate tensile strength: about 225 ksi (1550 MPa)
  • Yield strength: about 210 ksi (1450 MPa)
  • Elongation: about 12%
  • Hardness: about 45 HRC
  • Density: 0.279 lb/in³ (7.76 g/cm³)
  • Chemistry: about 13% chromium, 8% nickel, 2% molybdenum and 1% aluminum

These are typical values for 13-8Mo in the H1000 condition. Guaranteed minimums vary by specification, condition and size, so check the governing spec or your mill cert for design values.

Why Aerospace Engineers Choose 13-8Mo Stainless Steel

13-8Mo offers higher strength than 15-5PH stainless steel along with excellent toughness in large sections and good stress-corrosion resistance. Double vacuum melting keeps properties uniform, which matters for critical flight hardware. For the highest strength with corrosion resistance, compare it with Custom 465 stainless bar. Common uses for 13-8Mo include:

  • Landing gear and flap track components
  • Aircraft structural fittings and actuators
  • Nuclear reactor components
  • Petrochemical and injection-molding parts
CNC lathe turning a metal bar

13-8Mo Stainless Steel FAQs

Why is 13-8Mo vacuum melted?

Vacuum induction melting followed by vacuum arc remelting removes inclusions and gases. That gives the clean, consistent material needed for fatigue-critical aerospace parts.

How does 13-8Mo compare with 17-4PH?

13-8Mo reaches higher strength with better toughness and transverse properties, but it costs more. 17-4PH is a good value for less demanding parts.

Which aging condition should I specify?

H950 or H1000 for maximum strength, and H1025 or above when toughness and stress-corrosion resistance are more important. Your drawing or customer spec usually names the condition.

Cut-to-Size 13-8Mo Stainless Steel With Delivery Across Texas

We ship 13-8Mo stainless steel throughout Texas, Oklahoma, Louisiana, New Mexico and Arizona, and we saw bar and plate to the size you need. See our processing services for cutting options, or browse all the metals we supply. We also supply 15-5PH and Custom 465 stainless bar.

To get pricing, send us the grade, condition, form, size, length and quantity through our quote request form, or call (888) 444-6061.