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M20 National Four Die Boltmaker

Inventory ID:11813

Year of Manufacture:1987

One Used National model M20Four Die Boltmaker, Built 1987

Specifications:

Maximum Bolt 22mm at HIgh Tensile
Minimum Bolt with Thread: 16mm
Die KO Stroke: 30/168mm
Cutoff Length: 38-200mm
Maximum Punch KO Stroke: 48 mm
Maximum Thread Length: 75 mm
Production PPM:  90/min.


Dies Diameter  X Length: 122 x 184 mm
Punches Diameter X Length: 95 x 176.2 mm
Diameter Quill( Diameter X Length): 93.7 x 130.5 mm
Cutoff Knife ( D x L): 55 x 30 mm

Dies Pitch: 139.7 mm
Motor: 75 Kw
Net Weight: 46.7 T

MACHINE RENEW AND MAIN MODIFICATION ON 1996
The machine refurbishment in 1996 was done disassembling the forging area and rebuilding
part by part with new up-date components for: Mechanical (slides, bearings etc); Hydraulic system;
Machine lubrication and coolant oil; Pneumatic system;


Finger opening transfer cam
Pointing station eliminated
New transfer from Trimming to Thread rolling station included
Sound proof cabinet

Located: 

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