Aerospace Market

When Failure Is Not an Option, Trust Plymouth^®

The aerospace industry demands unwavering material reliability and proven engineering excellence for every mission. Plymouth^® supports these requirements with a century of manufacturing leadership, providing American-made seamless and welded aerospace tubing alongside precision near-net extrusions.

By delivering high-performance components built for peak consistency, we provide the strategic partnership required for the world’s most demanding flight environments. When failure is not an option, aerospace OEMs and Tier 1 suppliers trust Plymouth^® for the structural and fluid-system solutions necessary for trusted, long-term performance.

Aerospace Applications

Airframe and structural parts
Wing mounts Nacelle and engine mounts
Longerons
Engine pylons
Fuselage chords
System component racks

When Failure Is Not an Option, Trust Plymouth^®

Aerospace Applications

Airframe and structural parts
Wing mounts Nacelle and engine mounts
Longerons
Engine pylons
Fuselage chords
System component racks

Plymouth^® Aerospace Products

To ensure mission-readiness, our aerospace products are manufactured using advanced hot extrusion, cold drawing, and bright annealing to achieve precise tolerances and superior finishes. Our facilities operate under AS9100D and ISO 9001:2015 quality systems, meeting or exceeding rigorous AMS and MIL-spec requirements.

Every component is validated through Nadcap-accredited non-destructive testing (NDT)—including ultrasonic and eddy current inspection—to guarantee the internal integrity required for flight-critical hardware.

ProMoly^®: Seamless 4130 Steel Tubing

Compared to standard 4130 steel tubing, ProMoly^® has greater strength and dimensional consistency, providing more fatigue resistance, repeatable construction, and an improved buy-to-fly ratio for aerospace components.

ProMoly^® Specifications

Measurement	Inches/Feet	Metric
OD Range	0.250” – 2.000”	6.35mm – 50.8mm
Minimum OD Tolerance	+/- 0.005” (up to 1.500” OD)	+/- 0.127mm (up to 38.1mm)
Maximum OD Tolerance	+/- 0.10” (above 1.500” OD)	+/- 2.54mm (above 38.1mm)
Wall Range	0.025” – 0.187”	0.635mm – 4.75mm
Minimum Wall Tolerance	+/- 10% (For IDs over 0.500”)	+/- 10% (For IDs over 12.7mm)
Maximum Wall Tolerance	+/- 15% (for IDs under 0.500”)	+/- 15% (for IDs under 12.7mm)
Maximum Length	26’	7.9m

Industry Specifications and Certifications

Grade: 4130
Industry Specifications: AMS-T-6736A | AMS-6371 | AMS-6360 | MIL-T-6736B
Certifications: ISO 9001
ProMoly^® is a registered trademark of Plymouth Tube Company.

Stainless Steel & Carbon Steel Extrusions

Stainless and carbon steel extrusions provide aerospace manufacturers with nearer-to-net extruded shapes, drastically reducing wasted material, machining time, overall weight, and streamlining the number of production steps for aerospace components.

Stainless Steel & Carbon Steel Extrusion Specifications

Carbon Steel Extruded Engineered Shapes

Carbon & Alloy Steel Grades	1018 1029 1030 1035 1040 1045	1050 1060 1215 4130	4140 4150 4340 6150	8620 8630 8640 9310	A36 A588 A690 Grade 50 Grade 60
Industry Specifications	AMS S6758 AMS 6415 AMS S5000	ASTM A 36 ASTM A 105 ASTM A 322	ASTM A 576 ASTM A 588 ASTM A 690	AMS-S-6758A AMS 6382
Outside Dimensions	Shape cross-section must fit within 6” (152.4mm) diameter.

Stainless Steel Extruded Engineered Shapes

Stainless Steel Grades	303 304 series 310 316 series	400 series 418 422	13-8 MO 15-5 PH 17-4 PH 17-7
Industry Specifications	AMS 5610 AMS 5613 AMS 5616 AMS 5621 AMS 5627	AMS 5629 AMS 5639 AMS 5640 AMS 5643 AMS 5645	AMS 5646 AMS 5648 AMS 5651 AMS 5659 AMS QQS 763	ASTM A 276 ASTM A 511
Outside Dimensions	Shape cross-section must fit within 5.5” (139.7mm) diameter.

Titanium Extrusions

Titanium extrusions are widely used in aerospace applications for their high strength-to-weight ratio, fatigue resistance, and compatibility with composite structures. Our nearer-to-net titanium extrusions are especially valued for their dimensional consistency and repeatable build quality, helping manufacturers produce aerospace components more efficiently.

Titanium Extrusion Specifications

Available Titanium Grades

6AL-4V

6AL-6V-2SN

6AL-2SN-4ZR 2MO*

Other grades available upon request.

Outside Dimensions

Shape cross-section must fit within 7.75” (196.8mm) diameter

*Shape cross-section must fit within 6” (152.4mm) diameter

Industry Specifications

AMS 4935
AMS 4975

DMS 1650
AMS-T-81556A

AMS 4921
MMS 1202

AIMS 03-18-011

Seamless Stainless Steel Tubing

Plymouth^® is a trusted seamless tube manufacturer and aerospace partner, supplying seamless stainless tubing engineered for dimensional consistency, full traceability, and compliance with SAE aerospace standards. Manufactured at our Salisbury Mill, this tubing meets aircraft industry specifications for a wide range of aerospace components.

Seamless Stainless Aerospace Tubing Specifications

Aircraft Specifications	Grades	OD Range	Wall Range	Maximum Length
AMS 5564, AMS 5565, AMS 5567, AMS 5569, MIL-T-5695	304/L	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5573, AMS 5584 1/8 hard	316/L	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5557, AMS 5570, AMS 5896, AMS 5897	321	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5557	347	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5581	625	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m

Mechanical Properties

Tensile Strength	515 MPa minimum / 75,000 psi minimum
Yield Strength	205 MPa minimum / 30,000 psi minimum
Total Elongation Under Load	30.000%
Hardness	22 Maximum HRC

Alloys

Austenitic: 304/L/N, 316/L/N, 317/L, 321, 347
Ferritic/Super-Ferritic: 430, 439
Duplex/Lean Duplex: 2101, 2205, 2507
High Nickel: AL-6XN^®, 600, 625, 800, 825, C-276, C-22
PH Grades: 17-4, 17-7
Specialty: E-Brite^®, Nitronic 30/40, Alloy 20, Invar 36, 718, 21-6-9

Seamless Nickel Alloy Tubing

Plymouth^®’s seamless nickel alloy tubing is engineered for aerospace applications requiring higher stress endurance and corrosion resistance, delivering tight tolerances and extending equipment performance lifespans. Designed for extreme conditions, our seamless nickel alloy tubing meets aircraft industry standards for a wide range of critical components.

Seamless Nickel Alloy Aerospace Tubing Specifications

Aircraft Specifications	Grades	OD Range	Wall Range	Maximum Length
AMS 5564, AMS 5565, AMS 5567, AMS 5569, MIL-T-5695	304/L	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5573, AMS 5584 1/8 hard	316/L	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5557, AMS 5570, AMS 5896, AMS 5897	321	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5557	347	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.141” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5581	625	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.141” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
PWA 1065	718	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.136” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
TP-716	718	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.136” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5561, BMS 7-185, HMS 6-1132	21-6-9	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.110” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5568	17-7PH^®	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.136” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5578	Custom 455^®	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.110” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m

Welded Nickel Alloy Tubing

Our welded nickel alloy tubing offers a cost-effective aerospace solution with higher stress tolerance and corrosion resistance than stainless steel, while meeting strict safety standards. Custom engineered to exact specifications, it delivers the durability and dimensional control required for extreme aerospace applications.

Welded & Drawn Nickel Alloy Aerospace Tubing Specifications

Aircraft Specifications	Grades	OD Range	Wall Range	Maximum Length
AMS 5564, AMS 5565, AMS 5566, AMS 5567, AMS 5569	304/L	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5557, AMS 5575	321	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5556, AMS 5575	347	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5581	625	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.141” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5580, AMS 5581	600	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.141” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
PWA 1065	718	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.136” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
TP-716	718	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.136” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5561, BMS 7-185, HMS6-1132	21-6-9	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.110” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5568	17-7PH^®	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.136” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5578	Custom 455^®	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.110” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m

Welded Stainless Steel Tubing

We manufacture welded stainless steel tubing engineered to deliver repeatable mechanical properties, high dimensional consistency, and safety compliance. Produced at our Trent Mill, this tubing meets aircraft industry requirements for use in numerous aerospace components.

Welded & Drawn Stainless Steel Aerospace Tubing Specifications

Aircraft Specifications	Grades	OD Range	Wall Range	Maximum Length
AMS 5564, AMS 5565, AMS 5566, AMS 5567, AMS 5569	304/L	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5557, AMS 5575	321	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5556, AMS 5575	347	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5581	625	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.141” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5580, AMS 5581	600	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.141” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
PWA 1065	718	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.136” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
TP-716	718	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.136” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5561, BMS 7-185, HMS 6-1132	21-6-9	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.110” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5568	17-7PH^®	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.136” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5578	Custom 455^®	0.188” – 4.000” 4.78mm – 101.6mm	0.016” – 0.110” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m

Mechanical Properties

Tensile Strength	515 MPa minimum / 75,000 psi minimum
Yield Strength	205 MPa minimum / 30,000 psi minimum
Total Elongation Under Load	30.000%
Hardness	22 Maximum HRC

Alloys

Austenitic: 304/L/N, 316/L/N, 317/L, 321, 347
Ferritic/Super-Ferritic: 430, 439
Duplex/Lean Duplex: 2101, 2205, 2507
High Nickel: AL-6XN^®, 600, 625, 800, 825, C-276, C-22
PH Grades: 17-4, 17-7
Specialty: E-Brite^®, Nitronic 30/40, Alloy 20, Invar 36, 718, 21-6-9

Downloads & Resources

File	Language	Size
Plymouth^® Product Catalog	EN	4 MB
ProMoly^® Brochure	EN	3 MB
Aerospace Shapes Brochure	EN	399 KB
Aerospace Tubing Sell Sheet	EN	989 KB
4130 Streamline Tubing	EN	144 KB
Extruded Engineered Shapes and Cold Drawn Shapes	EN	406 KB
Cold Drawn Net Shapes Brochure	EN	256 KB

Video	Watch
Specifying ProMoly^® is a Seamless Decision
ProMoly^® 4130 Cold Drawn Seamless Tubing
Fabricating, Bending, Welding 4130 Tubing
Titanium Extrusion Manufacturing Process
Plymouth^® – Tubing and Shapes You Can Trust
Plymouth Engineered Shapes at Plymouth^® \| Manufacturing Capabilities & Facility Overview
Eupora and FTS at Plymouth^® \| Manufacturing Capabilities & Facility Overview
Salisbury Plant at Plymouth^® \| Manufacturing Capabilities & Facility Overview
Trent Plant at Plymouth^® \| Manufacturing Capabilities & Facility Overview

When Failure Is Not an Option, Trust Plymouth®

When Failure Is Not an Option, Trust Plymouth®

Plymouth® Aerospace Products

ProMoly®: Seamless 4130 Steel Tubing

ProMoly® Specifications

Industry Specifications and Certifications

Stainless Steel & Carbon Steel Extrusions

Stainless Steel & Carbon Steel Extrusion Specifications

Carbon Steel Extruded Engineered Shapes

Stainless Steel Extruded Engineered Shapes

Titanium Extrusions

Titanium Extrusion Specifications

Seamless Stainless Steel Tubing

Seamless Stainless Aerospace Tubing Specifications

Mechanical Properties

Alloys

Seamless Nickel Alloy Tubing

Seamless Nickel Alloy Aerospace Tubing Specifications

Welded Nickel Alloy Tubing

Welded & Drawn Nickel Alloy Aerospace Tubing Specifications

Welded Stainless Steel Tubing

Welded & Drawn Stainless Steel Aerospace Tubing Specifications

Mechanical Properties

Alloys

Downloads & Resources

More than 100 Years of Innovation, Quality, and Custom Solutions

When Failure Is Not an Option, Trust Plymouth^®

When Failure Is Not an Option, Trust Plymouth^®

Plymouth^® Aerospace Products

ProMoly^®: Seamless 4130 Steel Tubing

ProMoly^® Specifications