AI Visibility Index: Precision Grinding Services in California

When a buyer asks an AI assistant for a precision grinding services supplier in California, these are the companies that get named. This is what we found when the cell was last measured.

122 companies tracked
Last measured September 30, 2026
Next measurement October 30, 2026

Look up your company Get your monthly report

The headline numbers

Never named by AI

99 of 122

companies never appeared in a single buying question

They were asked the same 5 buying questions as everyone else in this cell and were not named once.

23 named at least once
99 never named

Not sure whether you are one of them?Check your domain

Cell average: 0.47of 15
Across all 122 tracked companies.
Top ten average: 4.1of 15
The ten most visible companies in the cell.

A company's score is how many of the 15 measured answers named it.

The top ten in California

These are the companies AI assistants named most often when California buyers went looking for a supplier in this category.

Top 10 most AI-visible Precision Grinding Services companies in California, measured September 30, 2026
Rank	Company	Location	AI visibility
1	JTR Specialties Inc. 5 employeesSouth El Monte, California	South El Monte, California	9 of 15 answers
2	General Grinding Inc 12 employeesOakland, California	Oakland, California	4 of 15 answers
3	LongBar Grinding, Incorporated 15 employeesSanta Fe Springs, California	Santa Fe Springs, California	4 of 15 answers
4	Nelson Grinding 9 employeesFullerton, California 2 name variants Nelson Grindingmost common3 Nelson Grinding (Mattison Grinding division)1	Fullerton, California	4 of 15 answers
5	Specialty Surface Grinding Inc 15 employeesLos Angeles, California	Los Angeles, California	4 of 15 answers
6	TCI Precision Metals California	California	4 of 15 answers
7	Downey Grinding Co 61 employeesDowney, California 2 name variants Downey Grinding Co., Inc.most common2 Downey Grinding Co.1	Downey, California	3 of 15 answers
8	General Grinding 25 employeesLa Mirada, California	La Mirada, California	3 of 15 answers
9	Industrial Tool and Die, Inc. 13 employeesSanta Ana, California 3 name variants Industrial Tool & Die (ITD Inc.)most common1 Industrial Tool & Die (ITD)1 Industrial Tool & Die, Inc.1	Santa Ana, California	3 of 15 answers
10	Precision Grinding Co 12 employeesOrange, California 3 name variants Precision Grinding Company (PGC)most common1 Precision Grinding Co. (PGC)1 Precision Grinding Co.1	Orange, California	3 of 15 answers

30 more companies were named at least once. Companies outside the top ten are counted in the averages but not named here.

Also named, based in another state

AI assistants named these companies too, but MacRAE'S lists them in a different state, not California. They belong to that state's ranking, not this one.

Company	State	Mentions
Duval Precision Grinding	Massachusetts	6 of 15
M&M Jig Grinding	Washington	6 of 15
L&M Precision	Georgia	2 of 15
ATC, Inc.	Indiana	1 of 15
Delta Machine & Tool	Delaware	1 of 15
Schaffer Grinding Co., Inc.	Ohio	1 of 15

One of these yours?

A complete Blue Book listing is one of the sources assistants read in this category. Confirming your details is free.

Get your monthly report

The five questions we asked

Every company in this cell is measured on the same questions, written the way a buyer would type them. That is what makes the ranking a comparison rather than a collection of anecdotes.

1“Best precision grinding services companies in California”
2“Who supplies precision surface grinding for hardened tool steel plates in California”
3“I need a California precision grinding partner for a tight-tolerance hydraulic shaft production run, who should I talk to”
4“Top precision grinding services suppliers in California for aerospace machining buyers”
5“Which California precision grinders can hold flatness within 0.0002 inch on large plates”
6“List 20 precision grinding services companies in California with their specialties.”the roster question

Each question is asked more than once, which is why a company's score is out of 15 answers rather than out of the number of questions.

Where AI drew its answers from

These are the sources the answers in this cell leaned on most, ranked by how many of the named companies each one stands behind.

itdinc.us
3 companies
kokoquest.com
3 companies
mmjiggrinding.com
2 companies
nelsongrinding.com
2 companies
thomasnet.comDirectory
2 companies
turretlathe.com
2 companies
acrospec.com
2 companies
ameriprectool.com
2 companies
downeygrinding.com
2 companies
lmprecisioninc.com
2 companies
pacificgrinding.com
2 companies
precisiongrindingco.com
2 companies

56 sources were cited across this cell's answers from 46 domains. A directory page often stands behind several companies at once; a company's own site usually stands behind one.

California in context

California ranks 6th of 14 measured states in this category. Each bar is the share of that state's tracked companies that AI assistants named at least once; across every measured state in this category the share is 17%.

California (this report)Other measured statesCategory average (17%)

Look up a company

Enter a domain or a company name to see whether it is tracked in this cell, and whether the answers named it. This is a lookup against a measurement already taken, so it is instant.

Try generalgrindinginc.com or any other domain

The public Index publishes one measurement per cell. A monthly report covers your own company:

Every question it was named on
Every question it was not
What moved

Your own position is only ever shown to you.