Why This Vertical Numbering Unit?
When your existing numbering box skips digits, jams, or leaves a weak impression, it’s costing you usable sheets and re-run time. This replacement restores crisp, high-contrast numbers exactly where you need them — on the fly, without a separate offline process. It’s built to handle the real-world demands of a print shop: solvent exposure, high-pressure nip, and rapid cycling.
Key Features & Benefits
· True 7-Digit Vertical Design – Digits print in a vertical orientation, ideal for forms with tight margin spaces or where vertical numbering is specified.
· Seamless Compatibility – Mechanical mounting interface, drive engagement, and overall height match the factory numbering box on Heidelberg GTO/GTO 52/QM 46/QM 46-2 and related models.
· Smooth Sequential Action – Precision-machined ratchet, pawl, and digit wheels ensure reliable index every impression. No mid-run skips or double jumps.
· Clean Impression Profile – Hardened, polished steel numbering wheels produce sharp, easily readable figures without ink spread or halo effect, even on absorbent paper.
· Ink & Solvent Resistant – All internal components and the engraved face resist standard offset and letterpress inks, as well as wash-up solvents. No swelling or sticking.
· Built for High-Speed Runs – Balanced internal mechanism and robust return springs let the unit keep up with the GTO’s rated speed without bouncing or mis-registration.
· Simple Maintenance – Designed for easy in-shop cleaning and occasional light oiling. Open construction allows quick visual inspection.
· Replace Individual Units – If one box fails, replace just that unit. No need to buy a whole set.
Technical Specifications
Specification Detail
Part Type 7 Digit Vertical Numbering Machine (Numbering Box)
Digit Count 7 digits
Numbering Orientation Vertical
Compatible Presses Heidelberg GTO 46, GTO 52, QM 46-1, QM 46-2 (and variants with numbering stations)
Mounting Type Direct mechanical replacement for original numbering box
Digit Height Matches standard 7-digit Heidelberg numbering box specification (please check required size)
Movement Sequential automatic index; manual reset / detent as per design
Material Hardened steel frame, precision ground steel wheels, chemically resistant internal lubrication
Packaging Individual foam-lined box, VCI anti-rust paper
Compatibility Check
This numbering machine is specifically produced to replace the original numbering box on Heidelberg GTO and QM presses equipped with a numbering and imprinting shaft. To verify, confirm your machine’s parts manual or measure your existing box against the product images (available on the full listing). If you share your press serial number and the position of the numbering unit (e.g., operator side, centre), our team will double-check fitment before shipping.
What’s Included
· 1x 7 Digit Vertical Numbering Machine
· Factory-applied light protective oil (wipe clean before inking)
· Protective foam case suitable for long-term shelf storage
Frequently Asked Questions
Q: Is this an original Heidelberg part?
A: No, this is a precision aftermarket numbering machine manufactured to match the form, fit, and function of the numbering units used on Heidelberg GTO and QM presses. It is not sold as Heidelberg OEM.
Q: Can I ink this with regular offset ink?
A: Yes. The numbering wheels and face are compatible with standard oil-based offset and letterpress inks. For best results, use ink formulated for numbering and imprinting units.
Q: How do I prevent the numbers from skipping?
A: Ensure the unit is properly engaged, clean of dried ink and paper dust, and that the return spring has full travel. A tiny drop of light machine oil on the pivot points every few jobs keeps it indexing smoothly.
Q: Can I reset the number sequence easily?
A: Yes. Most 7-digit boxes allow manual reset via small levers or detent buttons. The exact reset method depends on the specific model. Instructions are included in the packaging.
Q: Does this unit print horizontally if I rotate it?
A: This unit is designed for vertical numbering. Changing the orientation will alter the digit reading direction. If you need a horizontal numbering machine, please check our other listings or contact us.
Why Order From Us
· Proven numbering machines that stand up to commercial press conditions
· Each unit is inspected for smooth indexing and wheel alignment before packing
· Shipped securely in foam-lined boxes to prevent transport damage
· Fast international delivery with tracking
· Straight answers from print machinery experts — we speak operator language
Get Exact Sequential Numbers On Press
Stop wasting time numbering offline. Fit a fresh 7 Digit Vertical Numbering Machine to your Heidelberg GTO or QM and print crisp, sequentially numbered documents directly from the delivery pile. Click add to cart or send us your press details for a free compatibility check — we’ll help you pick the right box with confidence.
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