AI Visibility Index: Industrial Fasteners in California

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

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

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The headline numbers

Never named by AI

535 of 558

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
535 never named

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Cell average: 0.13of 15
Across all 558 tracked companies.
Top ten average: 6.5of 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 Industrial Fasteners companies in California, measured September 30, 2026
Rank	Company	Location	AI visibility
1	California Fastener California	California	12 of 15 answers
2	Keystone Bolt & Supply Co 5 employeesCorona, California 2 name variants Keystone Bolt & Supplymost common8 Keystone Bolt & Supply Co.2	Corona, California	10 of 15 answers
3	Rainbow Nut & Bolt Co 10 employeesCorona, California 2 name variants Rainbow Nut & Bolt, Inc.most common6 Rainbow Nut & Bolt3	Corona, California	9 of 15 answers
4	California Bolt Co 5 employeesSanta Ana, California	Santa Ana, California	7 of 15 answers
5	Sierra Pacific Supply Co Inc 12 employeesCompton, California	Compton, California	6 of 15 answers
6	Accutite Fasteners Inc 35 employeesSignal Hill, California	Signal Hill, California	5 of 15 answers
7	Bolt Products, Inc. 15 employeesCity of Industry, California	City of Industry, California	4 of 15 answers
8	H.W.Eckhardt Corporation 23 employeesHuntington Beach, California 3 name variants H.W. Eckhardtmost common2 H.W. Eckhardt Corp.1 H.W. Eckhardt Co.1	Huntington Beach, California	4 of 15 answers
9	KAD Fasteners Inc 12 employeesBrea, California	Brea, California	4 of 15 answers
10	IQ Nut & Bolt Inc. California 2 name variants IQ Nut & Bolt Inc.most common3 IQ Nut & Bolt2	California	4 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
Butler Inc.	Texas	2 of 15
Industrial Threaded Products (ITP)	New York	2 of 15
ITP Inc.	New York	2 of 15
Bossard North America	Wisconsin	1 of 15
Fastenal	Washington	1 of 15
Frontier Fastener	Texas	1 of 15

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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 suppliers of industrial fasteners in California”
2“Who supplies high-strength corrosion-resistant bolts and nuts in California”
3“I need a California fastener supplier for a recurring OEM assembly production run, who should I talk to”
4“Top industrial fastener suppliers in California for manufacturing and MRO buyers”
5“Which California industrial fastener suppliers can provide certified traceable fasteners to ASTM and ISO standards”
6“List 20 industrial fasteners 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.

hweckhardt.com
3 companies
itpbolt.com
3 companies
keystonebolt.com
2 companies
bbsocket.com
2 companies
butlerbolt.com
2 companies
enigma.com
2 companies
gsfbolt.com
2 companies
iqnutandbolt.com
2 companies
oemmfg.com
2 companies
rainbownutandbolt.com
2 companies
tengco.com
2 companies
yellowpages.net
2 companies

52 sources were cited across this cell's answers from 43 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 28th of 28 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 10%.

California (this report)Other measured statesCategory average (10%)

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