Press Release Dongguan Qiaosen Machinery’s STC Series is premium open-type double crankshaft precision pneumatic punch press, upgraded based on ST series. Featured with dual-point force balance, extra-large working table, outstanding anti-eccentric load performance, it is specially designed for wide sheet metal, large structural parts, long-size workpiece stamping and progressive die production. All models comply with JIS Grade 1 precision standard, perfectly compatible with Qiaosen MT uncoiler and GO 2-in-1 straightener for full automatic production lines. This article adopts concise Q&A analysis with laboratory test data, model parameters, selection guide, official links and real customer application cases.

Q1 What are exclusive core advantages & laboratory test data of STC double-point series?

1. Dual-point crankshaft structure
   
   
   Independent double crankshaft synchronous drive, uniform stress distribution on whole working table. Left-right crankshaft synchronization error ≤0.02mm, thoroughly solves unilateral deflection and offset issues of single-point presses, extremely suitable for large-format wide plate stamping.
2. Frame & material performance
   
   
   Integral heavy-duty high-strength steel welded frame with stress relief treatment. Full-load frame deformation ≤0.02mm. Crankshaft is forged 42CrMo alloy steel (HRC 52–56), 1.3× higher structural strength and 2.1× longer fatigue life than ordinary 45# steel. Custom ZQSn10-1 phosphor bronze bushing, 1.5× higher wear resistance than conventional brass.
3. Precision & guide system
   
   
   6-point enclosed slide guiding structure with quenching & grinding treatment. Slider parallelism ±0.015mm, verticality ±0.02mm. 0.1mm fine die adjustment precision. Max stable stamping speed: 150 strokes per minute.
4. Safety & energy-saving performance
   
   
   Equipped with OMPI dry clutch-brake, hydraulic overload protection, infrared photoelectric safety guard. Emergency shutdown within 0.03s under 120% overrated load. 25%~35% lower power consumption than ordinary same-tonnage double-point presses. 72-hour non-stop stamping test with 648,000 cycles & zero downtime, 40% reduced mold wear rate.
5. Q2 Full model specifications

Model	Tonnage	Working Table Size	Core Advantages	Suitable Scenarios
STC-160	160T	Large widened table	Balanced force, stable wide-sheet stamping	Large hardware, panel components
STC-200	200T	Extra-large table	High rigidity, heavy-load anti-deflection	Auto structural parts, thick wide plate
STC-260	260T	Super large platform	Ultra-high load capacity	Oversized metal forming, heavy stamping

Q3 Targeted model selection suggestions

• Medium wide workpiece stamping (160T): Choose STC-160. Cost-effective widened table, ideal for metal panels, hinges and large hardware parts.
• Medium-heavy mass production (200T): Select STC-200. Excellent anti-eccentric load performance, perfect for automotive structural component continuous stamping.
• Extra-large heavy-duty forming (260T): Opt for STC-260. Super large platform and high load capacity for oversized thick sheet metal processing.
• Full automatic line matching: 100% adaptive to Qiaosen MT material rack and GO 2-in-1 straightener for seamless progressive die stamping production.

Q4 Real customer on-site application data

Q5 After-sales & Service Support

Conclusion