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M4 Screws Flat Head Multi Step Pin Shaft CNC Machining Small Parts
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M4 Screws Flat Head Multi Step Pin Shaft CNC Machining Small Parts
| Place of Origin | GuangdongDongguan |
| Brand Name | SITUO |
| Certification | ISO9001 & TS16949 |
| Model Number | ST-00011 |
Product Details
Material:
SUS304 / DIN 2462
Category:
Stainless Steel Sleeve
Surface Treatment:
Passivation
Processing Technology:
CNC Turning
Sample Period:
10 To 15 Days
Precision:
Min0.001
Head Shape:
Customized
Highlight:
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Payment & Shipping Terms
Minimum Order Quantity
1PCS
Price
5-10 USD per item
Packaging Details
Communication
Delivery Time
Communication
Payment Terms
T/T
Supply Ability
10000PCS per day
Product Description
M4 Screws Flat Head Multi Step Pin Shaft CNC Machining Small Parts
Stainless steel flat-head multi-step pin shaft M4 screws CNC machining
Technical Classification System of Machined Threads
Classification by Functional Orientation
- Fastening Threads (Basic Type): Triangular thread profile including Metric (M), Whitworth (W), and Unified National (UNC/UNF) standards. Thread angle 55°/60°, pitch diameter tolerance IT8-IT10, pitch accuracy ±0.02mm.
- Transmission Threads (High-Precision Type): Core types include Trapezoidal (Tr), Buttress (B), and Ball Screw threads. Ball screws feature transmission efficiency ≥90% and positioning accuracy ±0.001mm.
- Sealing Threads (Leak-Proof Type): 1:16 taper design with BSPP/BSPT (R/Rc) and NPTF standards. Taper tolerance ≤±0.005mm/m, sealing surface roughness Ra≤1.6μm.
- Special Threads (Customized Type): Including aerospace MJ threads and square threads requiring customized tools and fixtures.
Technical Adaptability of Processing Processes
| Processing Process | Core Parameters | Suitable Threads | Advantages | Limitations |
|---|---|---|---|---|
| Turning | Speed 500-3000rpm, Feed rate 0.1-1.0mm/r | All types (including non-standard) | Flexible, high efficiency for single-piece | High cost for mass production, skill-dependent |
| Tapping | Bottom hole tolerance | Small-size fastening threads (M1-M20) | High mass production efficiency, compatible with automation | Only for standard threads, easy tool breakage in deep holes |
| Rolling/Thread Rolling | Rolling force 5-50kN, Preformed diameter tolerance ±0.03mm | Fastening coarse-pitch threads (M3-M30) | Chipless forming, strength increased by 20-30% | Only for ductile materials, poor adaptability to non-standard threads |
| Thread Grinding | Grinding wheel speed 3000-6000rpm, Grinding allowance 0.05-0.1mm | High-precision transmission/sealing threads | Precision IT4-IT6, excellent surface quality | Long processing cycle, high equipment cost |
Core Technical Control Points
Preprocessing Controls
- Clamping concentricity ≤0.01mm, use centering fixtures
- Match special tools with cutting edge roughness Ra≤0.8μm
- Quench and temper hard materials, remove oxide layers from soft materials
Processing Process Controls
- Cutting parameters: High speed (500-3000rpm) and low feed rate for soft materials; low speed (300-1000rpm) and medium feed rate for hard materials
- Coolant pressure ≥0.3MPa for difficult-to-machine materials
- Dimensional monitoring: Inspect pitch diameter, pitch, and thread angle for first article; sample inspection every 50 pieces during mass production
- Chip removal and cooling: High-pressure cooling (flow rate ≥10L/min) for internal threads; bottom hole depth of blind holes exceeds effective length by 2-3 times the pitch
Post-Processing and Inspection Controls
- Surface treatment: Galvanizing (8-12μm) / nitriding (0.1-0.3mm) for corrosive environments; Teflon coating for high-temperature scenarios
- Precision inspection: Use go/no-go gauges for general threads; control cumulative pitch error ≤0.01mm/m for high-precision threads
- Fit verification: Pressure test for sealing threads; no jamming and noise ≤75dB during no-load operation for transmission threads
Special Scenario Controls
- Thin-walled parts: Rough machining - stress relief - finish machining, reduce feed rate by 30%
- Multi-start threads: Lead accuracy ≤0.02mm
- Large-size threads (>50mm): Turn-mill composite machining, cutting depth ≤0.2mm per pass
Manufacturing Capabilities
Head Shape Classification
Pan Head, Button Head, Flat Head / Countersunk Head, Oval Countersunk Head, Hex Head, Socket Head Cap Screw, Square Head, Set Screw / Headless Screw, Truss Head, Eye Head, Flange Head, Phillips Pan Head, Phillips Countersunk Head
Processing Techniques
CNC Lathe, Machining Center (MC), Boring Machine, Grinding Machine, Broaching Machine, Hobbing Machine, EDM Sinker Machine, Wire EDM Machine, Forging Press, CNC Punch Press
Surface Treatment Requirements
Surface Cleaning & Finishing, Chemical Conversion Coating, Electrochemical Treatments, Surface Coating, Surface Modification (Heat Treatment/Diffusion), Mechanical Strengthening, and various specialized finishing processes
We have introduced advanced equipment and technology from Japan and Germany (CNC 5-axis and 6-axis machines) to better serve our customers' needs.
Technical Specifications
| Maximum Processing Outer Diameter | 60mm |
| Minimum Control Tolerance | 0.001mm |
| Equipment | Japanese CNC Tsugami, CNC Citizen, multi-station cold extrusion forming machines, 500T press machines, casting equipment |
| Company Size | 300 employees including 20 technicians, 10 engineers, and 15 quality control personnel |
| Certifications | ISO9001 and TS16949 automotive certifications with 8S management |
| Major Customers | Foxconn, Husqvarna, Shimano, NVIDIA, DJI Drones, Siegenia, Cater-pillar |
Production Capacity
| Main Products | Stainless steel screws, carbon steel screws, pins, rivets, nuts, eccentric nails, embedded parts, and other fasteners |
| Business Type | Factory / Manufacturer |
| Services | CNC Machining, Turning and Milling, CNC Turning, Cold heading, Stamping, Assembly Service |
| Materials | Aluminum, Stainless Steel, Steel, Alloy Steel, Titanium, Brass, Copper, Bronze, Magnesium alloy, Engineering Plastics |
| Finishes | Sandblasting, Anodizing, Plating, Polishing, Powder coating, Passivation, and various specialized surface treatments |
| Drawing Formats | STEP, STP, GIS, CAD, PDF, DWG, DXF etc or samples |
| Tolerance | +/-0.01mm ~ +/-0.05mm |
| Surface Roughness | Ra 0.1~3.2 |
| Inspection Equipment | Complete inspection lab with Micrometer, Optical Comparator, CMM, and various precision measuring instruments |
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Contact Us at Any Time
13925509630
No. 9, Shi bi One Alley, Zhangmutou Town, Dongguan City, Guangdong Province
