Last updated: November 11, 2026
Is McMaster-Carr down? User reports indicate possible problems with McMaster-Carr
McMaster-Carr is a popular choice for people who want reliable service. If McMaster-Carr is not working for you right now, check the live status below to see if it is down.
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McMaster-Carr problems reported in the last 24 hours
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Where McMaster-Carr reports are coming from in the last 24 hours.
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McMaster-Carr outage history
Our latest check and the live report status for McMaster-Carr.
✓ Our latest check (10 November 2026, 7:00 AM PKT): mcmaster.com answered normally in 847 ms.
Good news. McMaster-Carr has no reported problems right now. If it is not working for you, report it above and your report will appear here.
McMaster-Carr uptime and reports
Live report counts and the day by day record for the last 30 days.
User reports received in each period.
Last 30 days, day by day: 13 October 2026 to 11 November 2026
Green: up. Red: outage. Amber: some checks failed. Grey: no record yet.
The daily record builds from today as our checks run. Grey days have no saved record yet. A red day marks a confirmed outage.
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McMaster-Carr on social media
An early signal from outside our site, watched in rotation.
Posts on Bluesky saying McMaster-Carr is down. Checked 10 November 2026, 4:04 AM PKT.
Quiet right now. Nobody on Bluesky is saying McMaster-Carr is down.
Guides that can fix it
Step by step fixes for the problems people report most.
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Is McMaster-Carr Down Right Now?
No, McMaster-Carr is not down right now. The site is operating normally and no widespread McMaster-Carr outage is being reported. If you searched is McMaster-Carr down because the catalog kicked you out, check the live status chart at the top of this page.
McMaster-Carr is the industrial supply giant engineers rely on for fasteners, tools, and raw materials, famous for next-day delivery. True site-wide outages are rare. Most reported problems are session disconnects, CAD download issues, and app crashes. A spike on the chart means real platform trouble. A flat chart means the McMaster-Carr status is fine and you are hitting one of its well-known session quirks. School workshop teachers browse the same catalog for lab fittings, then head back to portals like MEB for the paperwork side.
Is McMaster-Carr Down for Me or Everyone?
It is almost certainly just you, and probably the session timer. The site is famous for disconnecting visitors who browse too long without ordering, showing a message about being disconnected to protect sensitive information. If you were mid-research when it happened, that is the timer, not an outage. Log in before you start researching, because logged-in sessions get a longer leash.
Why Did McMaster-Carr Disconnect Me?
The disconnect policy exists to stop competitors from data-mining the catalog, and it catches legitimate long browsing sessions too. You get a message that you are disconnected for a period, often an hour, and there is no way to shorten it. Starting your session logged in extends the allowed time significantly.
The practical workaround is simple: log in first, then research, then order without long idle gaps. If you were disconnected near the next-day order cutoff, the lost hour can genuinely cost you a day of delivery, so plan long research sessions accordingly.
Why Can I Not Download CAD Models?
CAD downloads recently started requiring an account where they did not before. If the download button stopped working, create an account and sign in, then retry. Design software integrations that pull McMaster components now prompt for login in the dialog, which catches longtime users off guard.
Browser security settings can also block the download flow. If you are signed in and downloads still fail, try a different browser with default security settings and disable aggressive content blocking for the site.
Why Is the McMaster-Carr App Crashing?
The mobile app gets mixed reviews: some users find it perfectly functional while others report freezes, crashes, and stalls that force them back to the desktop site. If the app misbehaves, the mobile website in your browser is often the more reliable path. Reinstalling the app clears the corrupted state behind most crash loops.
Why Was My McMaster-Carr Order Cancelled?
Order cancellations are a policy matter, not a site outage. Small or individual buyers, especially outside the US, sometimes have orders refused with little explanation. If your order was cancelled, contact customer service directly with a business name on the account, which resolves most of these cases.
Common McMaster-Carr Problems and Fixes
Disconnected for browsing too long
Wait out the lockout period. Next time, log in before researching to get a longer session, and avoid long idle gaps before ordering.
CAD downloads not working
Create an account and sign in; CAD access now requires login. Retry in a different browser if downloads still fail.
Site will not load or shows errors
Check the chart for a real outage. Otherwise clear your cache, disable content blockers for the site, and try another browser.
App freezes or crashes
Reinstall the app fresh. If problems continue, use the mobile website instead, which many users find more reliable.
Order cancelled unexpectedly
Contact customer service with a business name on the order. Cancellations are policy decisions, not technical failures.
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Frequently Asked Questions
What can I do if McMaster-Carr keeps asking me to prove I am human while I use a VPN?
The site runs strict anti-bot checks and treats VPN and data centre addresses as suspicious. Heavy catalog scraping by other users of the same VPN makes it worse. Turn the VPN off for ordering, or switch to a residential connection and try again.
Why did McMaster-Carr disconnect me for an hour?
The site limits long browsing sessions to prevent data mining. Logging in before you research gives you a longer session window.
Why can I not download CAD files from McMaster-Carr?
CAD downloads now require an account. Sign in, then retry. Software integrations also prompt for login in their dialogs.
Is the McMaster-Carr app reliable?
Reviews are mixed. The desktop and mobile websites are generally more reliable than the app, so use the browser if the app crashes.
Why was my McMaster-Carr order cancelled?
Cancellations are usually policy-related, especially for individual or international buyers. Contact support with a business name on the account.
How fast is McMaster-Carr delivery?
Orders placed before the daily cutoff typically arrive next day. A session disconnect near the cutoff can cost you that next-day window.