GAGE ASSEMBLY COMPANY

What GAGE ASSEMBLY COMPANY does

GAGE Assembly Company is a third-generation, privately held precision thread gage manufacturer founded in 1953 in Chicago, Illinois and now headquartered in Lincolnwood, Illinois. The company produces precision thread gages — tools used to verify the dimensional accuracy of threaded components — serving the aerospace, defense, energy, oil & gas, automotive, and medical device industries. Its published customer roster includes Boeing, Raytheon, Caterpillar, General Electric, Siemens, Moen, Goodyear, and Sylvania, indicating qualification into demanding OEM supply chains across multiple regulated verticals.

The company's technical foundation rests on two proprietary process assets: a hard chrome plating process acquired in 1982 that produces wear-resistant gage surfaces, and CNC thread grinding capability installed in 2013 that supports precision gage production to tight tolerances. The product catalog covers a wide range of thread forms including Acme, Buttress, NPT, NPSM, NPTF, STI, UN/UNF/UNEF/UNS, UNJC/UNJF, MJ, M, and Metric series. The company operates under an ISO 9001:2015 quality system and MIL-spec compliant processes, both of which function as gatekeepers for aerospace and defense procurement.

GAGE distributes its products through a network of authorized industrial distributors serving North American and international markets, alongside direct sales. Pricing is specification-driven per tool or custom order rather than subscription- or volume-based. The firm has 11–50 employees, has not disclosed revenue, and has taken no external funding — consistent with a closely held family business operating continuously for over seven decades. No M&A, leadership change, or recent capital event is disclosed in the available material.

Name

GAGE ASSEMBLY COMPANY

Legal name

Gage Assembly Company

Website

https://gageassembly.com

Company type

Private

Founded year

1953

Operating status

Operating

Headcount range

11–50 employees

Short description

GAGE Assembly Company is a third-generation, family-owned precision thread gage manufacturer founded in 1953, serving aerospace, defense, energy, oil & gas, automotive, and medical industries with proprietary hard chrome plating and CNC thread grinding capabilities.

Ownership category

akta.pro rank

Product category

Precision Industrial Gauging / Metrology Equipment

NAICS

Precision Turned Product Manufacturing (332721)

SIC

Industrial Instruments For Measurement, Display, And Control (3823)

akta.pro primary industry

Metrology, Inspection & Machine Tool Accessories (CMMs, Probing, Gauging) (IMAHADAK)

akta.pro secondary industry

Test & Measurement Equipment (Oscilloscopes, DAQ, signal analyzers, calibration benches) (IMAGAFAC)

Keywords

• Precision thread gages
• Thread plug gages
• Thread ring gages
• Precision measurement instruments
• Custom thread gauges

Headquarters

HQ city

Lincolnwood

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. Precision Thread Gauge Hardware Sales: One-time hardware sales of precision thread plug gages, thread ring gages, plain cylindrical gages, and specialty gauges. Revenue generated from both standard catalog products and custom-manufactured gauges to customer specifications.

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels5 records

Core offering

GAGE Assembly Company manufactures precision fixed-limit thread plug gages, thread ring gages, plain cylindrical gages, and specialty/custom thread gauges (Acme, Buttress, NPT, NPSM, NPTF/ANPT, STI, Taperlock, Reversible, Trilock). Products verify pitch diameter and fit of threaded components for aerospace, defense, energy, oil & gas, automotive, and medical OEMs, with accuracy to millionths of an inch and MIL-spec, AS9100, and ISO compliance.

Product overview

Gage Assembly Company is a precision thread gage manufacturer offering a comprehensive portfolio of fixed-limit measuring instruments. The product line centers on thread gages (plug and ring configurations) available in Taperlock, Reversible, and Trilock styles, along with plain cylindrical gages for unthreaded bore measurement. Specialty thread products include Acme, Buttress, NPT, NPSM, NPTF, ANPT, and STI (Helical Coil) gages. The company provides standard catalog products with sizes ranging from 000-120 threads per inch to 15.5 inch diameter, as well as custom gage manufacturing from customer-supplied drawings. All thread plug gages are hard chrome plated at no extra cost. The product range includes master setting discs for calibration and set plug gages for verifying ring gage accuracy.

Differentiator

Problem solved

Functional benefit

Products and services

• Thread Gages Precision fixed-limit thread gages used to verify the pitch diameter and fit of threaded parts. Available in plug and ring configurations with GO/NO GO ends for pass/fail inspection across multiple thread standards.
• Plain Cylindrical Gages Precision gauges that measure the diameter of unthreaded holes or shafts to verify parts meet specifications and fall within designated tolerances. Available in plug and ring configurations.
• Acme Thread Gauges Precision gauges for verifying Acme thread components with 29-degree thread angle. Available in general purpose (2G, 3G, 4G), centralizing (ACME-C), and stub variants.
• Buttress Thread Gauges Specialized gauges designed to handle high axial thrust while releasing quickly, featuring heavily slanted trailing faces with perpendicular edges for unidirectional load applications.
• NPT Thread Gages (National Pipe Taper) Precision gauges designed to check tapered threads for tight, leakproof seals in plumbing and hydraulic applications.
• NPSM Thread Gages (National Pipe Straight Mechanical) Gauges designed for straight pipe threads, providing accurate measurements for National Pipe Straight Mechanical thread dimensions in plumbing and mechanical applications.
• NPTF and ANPT Gages Precision gauges for dry seal connections without leaks, used in applications where achieving a tight seal is critical. ANPT stands for Army and Navy Aeronautical Tapered Pipe Thread.
• STI (Helical Coil) Thread Gages Thread gauges designed for screw thread inserts (STI), checking that threaded holes adhere to specifications needed for helical coil insert installation.
• Set Plug Gages Gauges that verify the accuracy of thread ring gages, ensuring they have been manufactured according to specifications. Used to calibrate adjustable style rings.
• Taperlock Thread Plug Gages Thread plug gages with tapered shank design that inserts firmly into an aluminum handle. Used to check accuracy of internal threads with interchangeable members.
• Reversible Thread Plug Gages Thread plug gages featuring double-ended GO and NO GO members that can be removed, flipped, and reinserted when worn, effectively doubling the gage's service life.
• Trilock Thread Plug Gages Heavy-duty thread plug gages built from durable graphitic tool steel with bolted three-pronged handle for extra stability. Designed for large diameter threads and demanding applications.
• Thread Ring Gages Precision gauges that verify the accuracy of external threads to ensure threaded components fit securely. Root relieved for longer and more accurate gaging life.
• Master Setting Discs Precision-manufactured reference standards used for calibration of measurement tools and instruments. Available in Styles 1, 2, and 3.
• Taperlock Plain Plug Gages Plain plug gages with tapered shank design for measuring dimensions of unthreaded bores. Class X tolerance with progressive design combining GO and NO GO members.
• Reversible Plain Plug Gages Plain plug gages with GO and NO GO ends for fast and efficient hole sizing. Precision-engineered for accurate measurements with extended service life.
• Trilock Plain Plug Gages Plain plug gages for verifying accurate hole dimensions, especially in applications where exact precision is critical. Built for long-term use with high precision and reliability.
• Custom and Special Thread Gages Custom-manufactured thread gages built to customer specifications and drawings, complementing the standard catalog line for specialized thread forms and dimensions not covered by stock products.

Quantifiable outcome

• Pitch diameter guaranteed in upper half of gage makers tolerance chart for longer wear

Named customers8 records

Segments6 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Three partnerships are on record, tiered core and minor.

• National Association of Manufacturers (NAM)coreOthersMember of NAM since company founding, providing industry advocacy, networking opportunities, and credibility within the U.S. manufacturing sector.
• SME (Society of Manufacturing Engineers)minorOthersMember of SME professional organization connecting manufacturers with manufacturing engineering resources and community.
• Worldwide Industrial DistributorscoreChannel Partner/ Reseller/ DistributorGlobal network of industrial distributors enabling worldwide sales of gaging products without requiring direct international subsidiary presence.

Scale indicators3 records

Recent moves9 records

Expansion highlights4 records

Direct peers

• Meyer Gage Company: US manufacturer of thread and cylindrical gages, including custom plug and ring gages for aerospace, military, and industrial applications. Closely comparable niche precision gage business serving similar safety-critical verticals.
• Thread Check Inc. US-based precision thread gage manufacturer offering thread plug and ring gages plus custom thread inspection solutions to aerospace, automotive, and industrial customers — directly competing with Gage Assembly in the same product category and customer verticals.
• Vermont Gage: Specialty manufacturer of precision thread plug and ring gages plus ANSI/ISO standards. Directly comparable product line (fixed-limit thread gages) and similar distribution model serving industrial OEMs in North America.
• Fred V. Fowler Company: Long-standing US precision measurement and metrology supplier offering dimensional measurement tools, including gaging products, to industrial manufacturers. Comparable as a mid-sized US metrology specialist serving industrial customers.
• Westport Precision Instruments: Niche US precision gage and measurement supplier focused on dimensional metrology products for industrial and aerospace customers. Comparable as a smaller specialty competitor in fixed-limit and custom gaging.

Broad incumbents

• L.S. Starrett Company: Established US manufacturer of precision tools, gages, and metrology equipment with a broad industrial product portfolio. Overlaps with Gage Assembly in precision measurement for industrial and aerospace customers but serves a much wider product range.
• Mitutoyo America: Global leader in precision metrology offering a much broader portfolio of dimensional measurement instruments, including thread and specialty gages, plus digital and electronic measurement solutions. Competes via scale, brand, and digital capabilities.
• Insize USA: Global precision measurement instrument manufacturer offering a wide catalog of gages, calipers, and metrology tools. Competes on breadth, price, and global distribution — particularly pressure on standard thread gage catalog lines.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/GageAssembly
• LinkedInlinkedin.com/company/gage-assembly-company

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about GAGE ASSEMBLY COMPANY