Description
DuoMac-C31 / C21 Comb & Wire Binding Machine
The DuoMac-C31 and DuoMac-C21 are versatile 2-in-1 comb and wire binding machines designed for offices, schools, churches, and professional document finishing environments. These powerful systems combine comb punching and opening with twin loop wire punching and closing in one durable, all-metal machine.
Model Configurations
DuoMac-C31: Comb + 3:1 Pitch Wire
DuoMac-C21: Comb + 2:1 Pitch Wire
Both models allow users to switch between plastic comb binding and twin loop wire binding without requiring multiple machines.
Dual Binding Flexibility
The DuoMac-C31 / C21 binding machines:
Punch and close 3:1 or 2:1 pitch wire
Punch plastic comb patterns
Include built-in comb opener
Handle up to 20 sheets (20 lb paper) per lift
Offer 14″ punching width with open sides
All punching pins are independently disengageable, allowing users to punch custom document sizes without partial side-end perforation.
Durable & Professional Construction
Wire closing capacity from 3/16″ to 1-1/4″
All-metal construction
Smooth comb opening mechanism
1-Year Manufacturer Warranty
The DuoMac-C31 & C21 Comb and Wire Binding Machine is ideal for organizations that require the flexibility of both comb and wire binding in a compact and cost-effective system.
✅ Technical Specifications
Technical Specifications
Wire Pitch: 3:1 (C31) or 2:1 (C21)
Comb Punch: Yes (with built-in comb opener)
Punch Capacity: 20 sheets (20 lb paper)
Punch Width: 14″ with open sides
Wire Closing Capacity: 3/16″ – 1-1/4″
Construction: All metal
Warranty: 1 Year
✅ Item Specifications
- Actual Machine Dimensions (L x W x H): 15-3/4″ x 16-1/2″ x 19″
- Shipping Length: 19″
- Shipping Width: 21″
- Shipping Height: 13″
- Shipping Weight: 65 Lbs.
- Compatible Supplies: 3:1 Twin-Loop Wire and 4:1 Spiral Binding Coils
FAQ: Frequently Asked Questions:
What is the main difference between the DuoMac-C31 and DuoMac-C21?
The difference lies in the wire binding pitch. The DuoMac-C31 is designed for 3:1 pitch wire (3 holes per inch), while the DuoMac-C21 is built for 2:1 pitch wire (2 holes per inch). Both models include the exact same standard 19-ring plastic comb punching and opening mechanism.
Can I punch custom paper sizes with this combo binding machine?
Yes. The DuoMac-C31 / C21 features fully disengageable punching pins. By pulling out a specific pin, you can prevent it from punching a hole. This is essential for professional document finishing on non-standard paper sizes, ensuring you don’t have “half-holes” at the edge of your sheets.
What is the punching capacity for plastic covers?
While the machine handles up to 20 sheets of 20lb paper, we recommend punching clear or frosted Binding Covers in smaller groups (1–2 at a time). This preserves the life of the steel punching dies and ensures a clean, professional finish without burrs.
Does this machine include a wire closer?
Absolutely. This is a complete 2-in-1 system. It features a built-in heavy-duty wire closer at the front and a plastic comb opener at the top. You can punch and finish your documents from start to finish without needing additional equipment.
Is the DuoMac-C31 / C21 suitable for high-volume use?
Yes. With its all-metal construction and heavy-duty internal components, this comb and wire binding machine is built for rigorous use in print shops, large offices, and schools. It is significantly more durable than plastic-chassis home office binders.
