Secure hinges, doors, and hoppers
A heavy-duty bolt seal with a proprietary locking mechanism, secured by a double-locking Duplexeal — engineered for hopper railcars and bulk transport.
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A bolt that locks twice over
The Hopper Bolt pairs a proprietary locking mechanism with a double-locking Duplexeal — and logs into the Red Flag STM (Security Transit Management) system.
Proprietary lock
Equipped with a special proprietary locking mechanism that resists theft and penetration into hoppers, doors, and hinges.
Double-locking Duplexeal
Secured with a highly secure Duplexeal — two independent locking mechanisms resist ratcheting, picking, and freezing.
Sized to the job
Available in 6 mm, 9.5 mm, and 12.5 mm diameters and various lengths, with other sizes on request.
STM-integrated
Compatible with the Red Flag STM suite of applications and handheld computers.
Built for hoppers, doors, and hinges
Every Hopper Bolt ships ready to log into STM — with custom numbering and your logo on request.
Bolt
- Length
- Available in various lengths
- Diameter
- 6 mm, 9.5 mm, 12.5 mm and other diameters
Seal
- Mechanism
- Duplexeal with two independent locking mechanisms
- Colors
- Choice of five colors
Security
- Locking
- Special proprietary locking mechanism
- Protects
- Hoppers, doors, and hinges — against theft and penetration
Integration
- Platform
- Red Flag STM suite & handheld computers
- Options
- Different bolt sizes, custom numbering, company logo
Install it right, every time
Learn the proper way to install the Red Flag Hopper Bolt to prevent theft and penetration into hoppers, doors, and hinges.
- Works on hoppers, hatches, doors, and hinges
- Secured by a double-locking Duplexeal
- Log and track every seal in STM
Zertifiziert & unabhängig geprüft
Red Flag erfüllt die Qualitätsstandards gemäß und im Einklang mit ISO, C-TPAT und Dayton Brown.
Alle ZertifizierungenSecure your transit
Get Hopper Bolt pricing for your fleet and lanes, or see the full Red Flag system — seals, STM, and incident response — in a 30-minute demo.
The rest of the Red Flag lineup
Need live tracking and theft alarms too? LXE is the connected seal — and STM ties every seal and shipment together.
LXE
Disposable GPS cable seal with live tracking and a 60-second theft alarm. No equipment, no subscriptions.
Learn more
LXR
ISO 17712 high-security cable seal for containers, railcars and trailers.
Learn more
Duplexeal
High-security, tamper-resistant cable seal with two independent locking mechanisms.
Learn more
STM
Security Transit Management — one dashboard for every shipment, seal and alert.
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SecureDrive
Digital trace of ownership handovers from origin to destination — mechanical seals plus driver-GPS tracking in the STM app.
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Digital Container Inspection
Guided digital inspections — truck & trailer, intermodal container, and railway equipment — that standardize checks and capture proof.
Learn more