Verified Nov 2026
CNC Machining
·
Harleysville, Pennsylvania
·
Since 1955
Stein Seal Company, founded in 1955 and headquartered in Harleysville, Pennsylvania, manufactures precision shaft seals and machined components for aerospace, nuclear, power generation, and industrial equipment sectors. The privately held firm employs 500–1,000 people and generated estimated revenue of $50–100 million. Recent activity includes government contracts for aircraft gas turbine engine seals and expanded machining capacity with a new DVF 4000 production system.
Stein Seal Company at a glance
Revenue
$50-100M
Est. band
Employees
500-1,000
Founded
1955
Headquarters
Harleysville, Pennsylvania
Certifications
AS9100 · ISO 9001 · Nadcap
Import activity
22
Industries
Automotive
Electric Vehicles
Industrial Equipment
Aerospace
Sourcing and import activity
From US customs bill-of-lading records
US sea imports
22
Named foreign suppliers
6
Top origins
Mexico · South Korea · China
Shared foreign counterparties do not establish that these companies buy from Stein Seal Company.
What this tells a buyer
Stein Seal received 22 customs shipments, with primary origins in Mexico (18 shipments), China (28 shipments), and South Korea (3 shipments) from suppliers including Seal and Metal Products of Mexico and Nanjing Speedy Laser Technology.
The company holds AS9100, ISO 9001, and Nadcap certifications and operates CNC machining, welding, seal production, and pump machining capabilities across facilities in Pennsylvania and Mexico, plus India.
Stein Seal holds government contracts for aerospace and defense seal assemblies, including a $2.5 million Department of Defense seal assembly award and ongoing production of aircraft gas turbine engine seals.
Source: US customs bill-of-lading records and public filings · Last verified Nov 06, 2026
STABILITY SIGNALS
Established & active
71 years in operation (founded 1955).
22 US import shipments on record.
Holds AS9100, ISO 9001, Nadcap certification(s) per public sources.
Overview
Stein Seal Company, founded in 1955 and headquartered in Harleysville, Pennsylvania, manufactures precision shaft seals and machined components for aerospace, nuclear, power generation, and industrial equipment sectors. The privately held firm employs 500–1,000 people and generated estimated revenue of $50–100 million. Recent activity includes government contracts for aircraft gas turbine engine seals and expanded machining capacity with a new DVF 4000 production system.
At a glance
Attribute | Detail |
|---|---|
Founded | 1955 |
Headquarters | Harleysville, Pennsylvania |
Employees | 500-1,000 |
Revenue | $50-100M (estimated) |
Primary capability | CNC Machining |
Certifications | AS9100 · ISO 9001 · Nadcap |
What Stein Seal Company makes
The company holds AS9100, ISO 9001, and Nadcap certifications and operates CNC machining, welding, seal production, and pump machining capabilities across facilities in Pennsylvania and Mexico, plus India.
Products and capabilities described on the company's own site include Welding, Seal, Machining, Pump (source: steinseal.com).
Certifications
Stein Seal Company is associated with the following certifications in public sources. Confirm the certified scope for the specific plant producing your part:
AS9100 — steinseal.com
ISO 9001 — steinseal.com
Nadcap — steinseal.com
Trade and customs footprint
Stein Seal received 22 customs shipments, with primary origins in Mexico (18 shipments), China (28 shipments), and South Korea (3 shipments) from suppliers including Seal and Metal Products of Mexico and Nanjing Speedy Laser Technology. US customs bill-of-lading records list 22 inbound shipments across 6 foreign suppliers, with top origins including Mexico · South Korea · China.
Latest developments
2026-10-21 — Spring-Loaded Shaft Seal Assemblies - Bidscope (bidscopeai.com)
2026-10-14 — SEAL, METALLIC, AIRCRAFT GAS TURBINE ENGIN | CLEATUS (cleat.ai)
2026-10-05 — Seal Assembly, Match — $2.5M | DEPT OF DEFENSE | FedOps (fedops.com)
2026-09-28 — 28--SEAL,AIR,AIRCRAFT G | HillSignal — HillSignal (hillsignal.com)
2026-04-28 — We’re excited to announce the newest addition to Stein Seal’s production capabilities—a DVF 4000 is now up and running. | Stein Seal Industrial Division (linkedin.com)
2026-03-30 — Introducing the DVF 5000 - Stein Seal Industrial Seals (steinsealind.com)
Facilities
Stein Seal Company is headquartered in Harleysville, Pennsylvania. Public sources also reference these locations:
India, Mexico — steinseal.com
Pennsylvania, USA — steinseal.com
Company details
Stein Seal holds government contracts for aerospace and defense seal assemblies, including a $2.5 million Department of Defense seal assembly award and ongoing production of aircraft gas turbine engine seals. Stein Seal Company was founded in 1955, has an estimated 500-1,000 employees, and is headquartered in Harleysville, Pennsylvania. On the LightSource stability read it is rated "Established & active": 71 years in operation (founded 1955). 22 US import shipments on record. Holds AS9100, ISO 9001, Nadcap certification(s) per public sources.
Frequently asked questions
What does Stein Seal Company make?
Stein Seal Company, founded in 1955 and headquartered in Harleysville, Pennsylvania, manufactures precision shaft seals and machined components for aerospace, nuclear, power generation, and industrial equipment sectors. The privately held firm employs 500–1,000 people and generated estimated revenue of $50–100 million. Recent activity includes government contracts for aircraft gas turbine engine seals and expanded machining capacity with a new DVF 4000 production system.
Where is Stein Seal Company headquartered?
Stein Seal Company is headquartered in Harleysville, Pennsylvania (1500 Industrial Blvd, Harleysville, Pennsylvania, 19438).
When was Stein Seal Company founded?
Stein Seal Company was founded in 1955.
How big is Stein Seal Company?
Stein Seal Company has an estimated 500-1,000 employees, with revenue in the $50-100M range (estimated).
What certifications does Stein Seal Company hold?
Stein Seal Company lists AS9100 · ISO 9001 · Nadcap on its website. Confirm the certified scope for the specific plant producing your part.
Does Stein Seal Company import from overseas suppliers?
US customs bill-of-lading records show 22 inbound shipments for Stein Seal Company, with top origins including Mexico · South Korea · China.
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Last verified Nov 2026. Is this your company? Request a correction.
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