What technology does mcmaster.com use?

We did not detect any specific technologies for mcmaster.com in the latest scan.

Is mcmaster.com secure (HTTPS)?

Yes. mcmaster.com uses TLS 1.2 with a certificate issued by DigiCert Inc, valid until Feb 18, 2027.

Who hosts mcmaster.com?

Hosting provider information for mcmaster.com is not available yet.

What is mcmaster.com's SEO score?

mcmaster.com scored 75/100 for SEO in the latest analysis (fair).

What is mcmaster.com's overall website score?

mcmaster.com has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.

Has mcmaster.com's score changed over time?

mcmaster.com's overall score has declined by 3 points (from 86 to 83) since Jul 25, 2026.

mcmaster.com

McMaster-Carr

Last scanned Aug 1, 2026, 11:00 AM · 9 views

Overall score

Great

Summary

McMaster-Carr is the complete source for your plant with over 700,000 products. SEO is good (75/100) and accessibility is good (85/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Multiple H1 headings found.

McMaster-Carr is the complete source for your plant with over 700,000 products. 98% of products ordered ship from stock and deliver same or next day.

Top issues to fix

9 issues found · 2 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Multiple H1 headings found
SEO
Keep a single H1 per page and demote the others to H2/H3.
No structured data (JSON-LD) found
SEO
Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.
robots.txt not found
SEO
Publish /robots.txt with a Sitemap: directive to guide crawlers.

+3 more issues — details in the sections below.

SEO

4 issue(s) found

100

Performance

484 ms

Security

HTTPS & header checks

Accessibility

1 issue(s) found

Score history

-3 overall since Jul 25, 2026

Overall: 83
SEO: 75
Security: 75
Performance: 100
Accessibility: 85

Organization

Company details published in this site's own structured data.

McMaster-Carr is the complete source for your plant with over 700,000 products. 98% of products ordered ship from stock and deliver same or next day.

Contact

Email, phone, and address published on this site's own pages.

Email: sales@mcmaster.com
Phone: +13309955500

Meta tags

Title: McMaster-Carr
Description: McMaster-Carr is the complete source for your plant with over 700,000 products. 98% of products ordered ship from stock and deliver same or next day.
Canonical: https://www.mcmaster.com/
Language: en
Charset: utf-8
Viewport: width=1024
Robots meta: nofollow, index, max-snippet:-1, max-image-preview:large, max-video-preview:-1
Manifest

Technologies

Detected frameworks, languages, and tools.

No technologies detected.

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.2
Issuer: DigiCert Inc
Subject: www.mcmaster.com
Valid from: Feb 16, 2026
Valid to: Feb 18, 2027
Days until expiry: 201
SAN domains: www.mcmaster.com, eprocurement.mcmaster.com, eprocurementqual.mcmaster.com, images1.mcmaster.com, images1qual.mcmaster.com, images2.mcmaster.com, images2qual.mcmaster.com, mcmaster.com, www2.mcmaster.com, www2qual.mcmaster.com, www3.mcmaster.com, www3qual.mcmaster.com, www4.mcmaster.com, www4qual.mcmaster.com, www5.mcmaster.com, www5qual.mcmaster.com, wwwqual.mcmaster.com

Security headers

Strict-Transport-SecurityMissing
Content-Security-PolicyMissing
X-Frame-OptionsEnabled
X-Content-Type-OptionsMissing
Referrer-PolicyMissing
Permissions-PolicyEnabled

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 27 · H2 61 · H3 5

Links

619 internal · 1 external · 20 broken

Images

36 total · 8 missing alt

Scripts / Styles

0 scripts · 0 stylesheets

JS / CSS size

0 B · 95.5 KB

Page size

189 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Multiple H1 headings found
No structured data (JSON-LD) found
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://mcmaster.com
Final URL: https://www.mcmaster.com/
HTTP status: 200
HTTP version: HTTP/2
Response time: 481 ms
HTML size: 189 KB
Redirect chain: https://mcmaster.com → https://www.mcmaster.com/

See something wrong on this report? Request a correction

Frequently asked questions

What technology does mcmaster.com use?: We did not detect any specific technologies for mcmaster.com in the latest scan.
Is mcmaster.com secure (HTTPS)?: Yes. mcmaster.com uses TLS 1.2 with a certificate issued by DigiCert Inc, valid until Feb 18, 2027.
Who hosts mcmaster.com?: Hosting provider information for mcmaster.com is not available yet.
What is mcmaster.com's SEO score?: mcmaster.com scored 75/100 for SEO in the latest analysis (fair).
What is mcmaster.com's overall website score?: mcmaster.com has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.
Has mcmaster.com's score changed over time?: mcmaster.com's overall score has declined by 3 points (from 86 to 83) since Jul 25, 2026.