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SAE 4340 Alloy Steel

Specifications: AMS 6359, AMS 6409, AMS 6414, AMS 6415, AMS 6454, ASTM A29, ASTM A322, ASTM A331, ASTM A506,ASTM A519, ASTM A646, ASTM A752, ASTM A829, MIL-S-5000, UNS G43400


AISI 4340 is a heat treatable, low alloy steel containing nickel, chromium and molybdenum. Alloy 4340 is known for its toughness and capability of developing high strength in the heat treated condition while retaining good fatigue strength. Typical applications for 4340 alloy steel are for structural use, such as aircraft landing gear, power transmission gears and shafts and other structural parts.

4340 Steel Aircraft Quality Vacuum Melted Bar per AMS 6414 N&T (Normalized & Tempered)

4340 Steel Aircraft Quality Air Melt Bar per AMS 6415
4340 Steel Aircraft Quality Plate & Sheet per AMS 6454, ASTM A322

SAE 4130 Alloy Steel

Specifications: AMS 6345, AMS 6348, AMS 6350, AMS 6351, AMS 6360, AMS 6361,AMS 6362, AMS 6370, AMS 6528, ASTM A29, ASTM A322, ASTM A331, ASTM A506, ASTM A507, ASTM A513, ASTM A519, ASTM A646, ASTM A752, ASTM A829, MIL-S-18729, MIL-S-6758


AISI 4130 is a low alloy steel containing molybdenum and chromium as strengthening agents. The carbon content is nominally 0.30% and with this relatively low carbon content the alloy is excellent from the fusion weldability standpoint. The alloy 4130 can be hardened by heat treatment. Typical applications for 4130 low alloy steel include structural use such as aircraft engine mounts and welded tubing applications.

4130 SteelAircraft Quality Annealed per AMS-S-6758


4130 Steel Aircaft Quality Annealed per AMS 6348


4130 Steel Aircaft Quality Annealed per AMS 6370


4130 SteelAircraft Quality Annealed per AMS 6345 N&T

4130 SteelAircraft Quality Annealed per AMS 6350

SAE4140 Alloy Steel

Specifications: AMS 6349, AMS 6381, AMS 6382, AMS 6390, AMS 6395, AMS 6529, ASTM A193, ASTM A194, ASTM A29, ASTM A320, ASTM A322, ASTM A331, ASTM A506, ASTM A513, ASTM A519, ASTM A646, ASTM A711, ASTM A752, ASTM A829, UNS G41400

Alloy 4140 is an oil-hardening steel of relatively high hardenability. Its chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength. C4140 responds well to heat-treatment and is comparatively easily machined in the heat-treated condition. With a combination of such highly desirable properties as good strength and wear resistance, excellent toughness, coupled with good ductility, and the ability to resist stress at elevated temperatures. Typical applications for 4140 alloy steel include shafts, gears, bolts, couplings, spindles, tool holders, sprockets, hydraulic machinery shafts, oil industry drill collars,Kelly bars, tools joints.

SAE 6150 Alloy Steel

Specifications: AMS 6448, AMS 6450, AMS 6455, AMS 7301, ASTM A29, ASTM A322, ASTM A331, ASTM A519, ASTM A752, ASTM A829, MIL-S-8503, UNS G61500

6150 is a fine grained, highly abrasion resistant carbon-chromium alloy steel. Very good shock resistance and toughness are also key properties of this alloy in the heat treated condition. Alloy 6150 Commonly employed in heavily stressed machinery parts including shafts, gears, pinions and also in hand tool components.

SAE 8620 Alloy Steel

Specifications: AMS 6274,AMS 6276, AMS 6277, AMS 6375, ASTM A29, ASTM A322, ASTM A331, ASTM A506, ASTM A507, ASTM A513, ASTM A519, ASTM A646, ASTM A752, ASTM A829, MIL-S-8690, UNS G86200


AISI 8620 an alloy steel designed for case hardening applications. The nickel imparts good toughness and ductility. The chromium and molybdenum contribute increased hardness penetration and wear, that may be carburized. The well balanced alloy content permits hardening to produce a hard wear resistant case combined with a core strength in the order of 125,000 PSI. It has excellent machinability and responds well to polishing applications.. With the balanced analysis, this steel provides, uniform case depth, hardness and wear properties, and gives the advantage of low distortion. Typical applications for alloy 8620 are caburized splined shafts, piston pins, cam shafts, guide pins, bushings, automotive differential pinions and transmissions, arbors, bearings, sleeves king pins, carburized gears, general engineering purposes.

SAE 8740 Alloy Steel

Specifications: AMS 6322 , AMS 6322F , AMS 6323 , AMS 6323D , AMS 6325 , AMS 6325D , AMS 6327 , AMS 6327D , AMS 6358 , AMS 6358B , ASTM A322 , ASTM A331 , ASTM A505 , ASTM A519 , MIL SPEC MIL-S-6049 , SAE J404 , SAE J412 , SAE J770 , UNS G87400


AISI 8740is a Standard grade Alloy Steel. It is commonly called AISI 8740 Nickel-chromium-molybdenum steel. It is composed of (in weight percentage) 0.38-0.43% Carbon (C), 0.75-1.00% Manganese (Mn), 0.035%(max) Phosphorus (P), 0.04%(max) Sulfur (S), 0.15-0.30% Silicon (Si), 0.40-0.60% Chromium (Cr), 0.40-0.70% Nickel (Ni), 0.20-0.30% Molybdenum (Mo), and the base metal Iron (Fe). Other designations of AISI 8740 alloy steel include UNS G87400 and AISI 8740.

AISI 9310 Alloy Steel

Specifications: AMS 6260, AMS 6265, AMS 6267, MIL-S-7393, MIL-S-83030, BMS 7-249, HMS 6-1263, 299-947-032, 299-947-302, EMS 56279, EMS 56280, SS 9705


AISI 9310 is a low alloy steel containing nickel, chromium and molybdenum noted for its good hardenability with high impact and fatigue strength. It is often used for carburized case hardened parts. 9310 VAC-ARC is a premium quality alloy carburizing steel produced by the vacuum consumable electrode process. It has a high hardenability, high core hardness and high fatigue strength, all of which make it ideally suited for critical aircraft engine gears.

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