· Product Overview

· Core Specifications

• Material: 45# Carbon Steel (304 Stainless Steel optional)45# carbon steel balances high tensile strength (≥600 MPa) and cost-effectiveness; 304 stainless steel adds enhanced corrosion resistance.
• Manufacturing Standard: ISO 4026 (Global Set Screw Specification)
  • Key Processes: Wire cold heading (blank forming) → Precision thread rolling (uniform external threads) → Hex socket machining (internal drive feature) → Black oxide surface treatment (rust protection + wear resistance).
  • Key Parameters:
    • Thread Type: Metric (M3–M8; customizable to UNC standards)
    • End Style: Flat end (for surface contact, standard) / Pointed end (for grooved shaft locking, optional)
    • Dimensional Tolerance: ±0.02mm (ensures tight fit with threaded holes)
  • Surface Finish: Black oxide (thickness 5–8μm; provides 48-hour salt spray corrosion resistance).

· Application Scenarios

• Industrial Machinery: Locking gears to shafts, securing conveyor system components, or tightening bearing housings.
• 3D Printing Equipment: Fastening hotend parts, locking linear rail brackets, or securing frame components (flush finish prevents filament jams).
• Electronic Enclosures: Positioning internal PCB modules, locking chassis parts, or securing sensor mounts (no protruding heads to interfere with components).
• Furniture & Hardware: Hidden fastening for cabinet hinges, drawer slides, or decorative metal fixtures (sleek, flush appearance).
• DIY & Hobby Projects: Compact assembly of model vehicles, custom tool jigs, or workshop equipment (headless design saves space).

· Production Process Introduction

1. Wire Cold Heading: Cut carbon steel wire into blanks and form the basic cylindrical shape via cold heading (no heat damage to material strength).
2. Thread Rolling: Use precision dies to roll uniform external threads (ensures thread integrity and load-bearing capacity).
3. Hex Socket Machining: Drill and mill the internal hex socket (compatible with standard hex keys for tightening).
4. Black Oxide Treatment: Submerge screws in a chemical bath to form a protective oxide layer (boosts rust resistance and wear durability).
5. Quality Inspection: Verify thread accuracy (via thread gauges), check dimensional tolerance (CMM scans), and test corrosion resistance (salt spray test).
6. Sorting & Packaging: Group screws by thread size/end style for organized inventory.

· Packaging and Shipping Methods

• Packaging: Screws are packed in resealable plastic bags (500–1000 pieces per bag); bulk orders are sealed in corrugated boxes with foam padding (prevents thread damage during transit).
• Shipping: Flexible logistics options:
  • Express Delivery (DHL/FedEx/UPS: 3–5 business days)
  • Air Freight (7–10 business days)
  • Sea Freight (20–30 business days)All shipments include full tracking and damage insurance.

· Process

· Frequently Asked Questions (FAQ)

• MOQ (Minimum Order Quantity): 1,000 pieces per thread/end style specification; small sample packs (50–100 pieces) are available for fit testing.
• Lead Time: Standard lead time is 7–10 working days after order confirmation; expedited production (5–7 working days) is available for urgent orders (additional fees apply).
• Customization Capability: Full customization is supported—we can adjust thread type (Metric/UNC), end style (flat/pointed), material (45# steel/304 stainless steel), or surface finish (zinc plating) based on your technical drawings. Our engineering team will validate design feasibility for fastening performance.