Pneumatic Underpinner NN400

NN400 Active Clamping Pneumatic Underpinner V-Nailer

SKU: NN400

Product Overview: ST-NN400

The ST-NN400 (Active Clamping) is a reliable pneumatic underpinner designed for professional frame joining. Featuring an Active Downward Clamping System and CNC precision control, it delivers consistent, high-quality joints for various materials from delicate foam to hardwood.

Core Features: Reliability with NN400 Active Clamping

  • Active Downward Clamping System
    The NN400 utilizes a robust pneumatic cylinder to apply vertical pressure directly onto the frame corner. This “Active Clamping” ensures the moulding stays perfectly flat against the table during nailing, preventing any lifting or shifting.
  • CNC Precision Control
    Although it operates without a large touchscreen, the built-in CNC system allows you to program precise nail spacing and positions. It supports over 100 stored configurations for quick recall.
  • High-Efficiency Stacking
    Capable of 5-nail stacking and 9-row synchronized nailing in a single cycle. This allows for deep penetration and strong joints on tall or hardwood frames.
  • Multi-Material Ready
    The adjustable pressure settings make it versatile for working with various materials, from delicate foam and gypsum to hard solid wood and MDF.

Technical Specifications

Specification Details
Model ST-NN400 (Active Clamping)
Machine Type Pneumatic Underpinner / V-Nailer
Clamping Method Active Downward Pressure
Max Frame Width 130mm (13cm)
Max Frame Thickness 100mm (10cm)
V-Nail Sizes 5mm, 7mm, 10mm, 12mm, 15mm
Air Pressure 6-8 kg/cm² (90-120 psi)
Net Weight 90-100 kg

Frequently Asked Questions (FAQ)

Q: What is the main difference between NN400 and NN500?
A: The NN400 is the standard model with button/digital controls, while the NN500 adds a full LCD Touchscreen. If you don’t need a visual touch interface but want the same powerful “Active Clamping” performance, the NN400 is the most cost-effective choice.
Q: Why is “Active Clamping” important?
A: Active Clamping applies downward force to hold the frame pieces firmly. This is crucial for joining warped wood or complex profiles, ensuring the corner remains tightly closed while the V-nail is driven in from below.
Q: Can I stack nails with this machine?
A: Yes, the NN400 supports multi-stacking V-nails (up to 5 per position), which is essential for ensuring the structural integrity of tall or heavy frames.
Product Manual / Downloads
Special Tech Specs
Active Vertical Clamping System:
Features a specialized “Active” top pressure pad. Unlike static clamps, the pad actively descends and compresses the moulding against the table milliseconds before the nail is fired. This prevents the frame from shifting or lifting, eliminating the “open corner” gap problem.
Dual-Stage Foot Pedal:
Allows for precise control. Press halfway to engage the clamp (to check alignment), and press fully to fire the V-nail. This reduces material waste by ensuring position accuracy before nailing.
Quick-Adjust Top Clamp:
The vertical clamping position can be adjusted instantly using the quick-release handle, allowing for rapid changeover between different frame heights without tools.
Extension Brake Kit:
Includes extended support arms (Extension Brake Kit) to stabilize long or heavy frame legs during the joining process.
Magnetic Pad Holder:
The pressure pad uses a magnetic locking mechanism (“Magnetic Suggestion”) for quick interchange of different rubber pad shapes (L-shape, Round, Flat) to fit various moulding profiles.
Device Parameters
Parameter Value
Model NN400 (Active Clamp)
Operation Type Pneumatic (Dual-Stage Pedal)
Max Moulding Width 120 mm
Max Moulding Height 80 mm
V-Nail Capacity 220 V-Nails
V-Nail Sizes 5, 7, 10, 12, 15mm
Clamping System Active Vertical + Horizontal
Air Pressure 0.6 – 0.8 Mpa
Power Supply Not Required (Air Only)
Machine Weight 70 kg (155 lbs)
Dimensions 650 x 550 x 1150 mm
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Additional Details
Xinky Steel Framing — manufacturing facility
Xinky Framing
Quality Steel Framing
Since 2004
20+
Years in industry
50+
Countries served
ISO
Certified quality
24h
Response time