Eagleflying can supply the turnkey self-tapping screw production line.

Self-tapping screws are among the most widely used fasteners in construction, HVAC, electrical, furniture, roofing and general metal/wood assembly — they cut or form their own thread in sheet metal, plastic, wood-based panels or pre-drilled holes. A turnkey self-tapping screw line takes you from steel or stainless wire rod to inspected, coated and packed finished screws. It is a cold-forming + thread-rolling + heat-treatment + surface-treatment system, broader than a drywall screw line because the product family covers pan/csk/hex/truss heads, sharp points, type-F points, cutting points and self-drilling Tek points.

1. Typical Products

Pan-head / countersunk / truss / hex-washer self-tapping screws

Type A / AB: sharp point, for sheet metal, plastic, wood

Type B / F: flat or cutting point, for thicker sheet, castings, pre-drilled holes

Chipboard / wood self-tapping screws (coarse, hi-low, Type 17 point)

Self-drilling / Tek screws (DIN 7504 / ISO 15480–15482), drill point + thread in one piece

Standards: ISO 1478, ISO 1481, DIN 7976, DIN 7981, DIN 7504, ANSI/ASME B18.6.4

Common range: ST2.2–ST8 (M2.2–M8); self-drilling line extends to M5.5 / M6.3; longer non-standard screws up to 150–200mm

 

2. Production Flow

Wire Rod→Descaling/Pre-treatment→Wire Drawing→Cold Heading→Point/Drill-Tail Forming→Thread Rolling→De-oiling→Heat Treatment→Surface Treatment→Inspection→Packing

Stage	Equipment	Purpose
Wire preparation	Descaler, lubricant coater	Clean oxide scale, apply lime/soap coating for drawing
Wire drawing	Straight-type / pulley drawing machine	Reduce rod to tapping-screw shank diameter (2.2–8.0mm)
Cold heading	1-die 2-blow/2-die 2-blow/3-station header	Form pan/CSK/hex/truss head, recess, blank length
Point/drill-tail forming	Pointing die/flute station/flute grinder	Sharp point, type-F slot, or self-drilling Tek flute
Thread rolling	High-speed flat-die/cylindrical-die roller	Roll tapping or self-drilling threads on soft blank
De-oiling	Wash tank/ultrasonic de-oiler	Remove rolling oil before furnace
Heat treatment	Mesh-belt carburizing + quench + temper furnace	Case-hardened point, tough core
Surface treatment	Zinc plating/black phosphate/Ruspert/Dacromet line	Corrosion resistance by market
Inspection	Optical sorter, hardness tester, torque/drill test	Dimensional, metallurgical and functional QC
Packing	Counting+bagging/box/collated-strip machine	Bulk, boxed, or magazine-packed finished screws

Threads are rolled before heat treatment; this is the standard self-tapping screw method and gives stronger, cleaner threads than cutting. Self-drilling flutes may be formed in-header or ground after heading for larger Tek points.

3. Key machine specification (reference)

Wire diameter: 2.2–8.0 mm (ST2.2-ST8)

Screw length: 4.5–150 mm

Cold heading: ST2.2 180–220, ST3.5 160–180, ST4.2 120–160, ST4.8 110–140, ST6.3 80–110, ST8 50–90 pcs/min.

Thread rolling: ST2.2 300–380, ST3.5 280–350, ST4.2 220–280, ST4.8 160–220, ST6.3 120–180, ST8 80–110 pcs/min.

Header motor: 0.75–7.5kW

Thread roller motor: 1.1–7.5 kW

Mesh-belt furnace: 60–300 kg/h by model (typical line 150–250 kg/h)

Zinc/phosphate line: 150–600 kg/h by configuration

Realistic line efficiency: 80–90% under stable conditions

Catalog speeds are not sustained speeds. Tooling wear, wire quality, length changes, and packing bottlenecks all affect real output.

4. Machine configuration

No.	Equipment	Function
1	Pay-off + straightener	Control wire tension and straightness
2	Wire drawing machine	Reduce rod to 2.2/2.9/3.5/3.9/4.2/4.8/5.5/6.3mm
3	Cold heading machine (1D2B/2D2B/3-station)	Head, recess, blank length, gimlet or drill-point pre-form
4	Point/flute machine	Sharp point, type-F slot, or self-drilling Tek flute
5	Thread rolling machine	Flat-die thread forming (coarse / fine / hi-low)
6	De-oiling machine	Remove rolling oil before furance
7	Mesh-belt heat treatment furnace	Carburizing + quench + temper for case-hardened points
8	Plating/phosphate/Ruspert/Dacromet line	Corrosion protection by market
9	Optical sorter + torque/drill test	Dimension, crack, point, case depth, drive vs strip
10	Packing machine	Bulk, boxed, collated strips, magazine coils

5. Capacity Reference

Size	Header Speed	Roller Speed	Balanced Output	Annual (300d×20h)
ST2.2×6-13mm	180-220pcs/min.	300-380pcs/min.	~180pcs/min.	~64.8 Million pcs/yr ≈ 1.5-2.5t/yr
ST3.5×13-25mm	160-180pcs/min.	280-350pcs/min.	~160pcs/min.	~57.6 Million pcs/yr ≈ 5-8t/yr
ST4.2×16-38mm	120-160pcs/min.	220-280pcs/min.	~120pcs/min.	~43.2 Million pcs/yr ≈ 12-18t/yr
ST4.8×19-50mm	110-140pcs/min.	160-220pcs/min.	~110pcs/min.	~39.6 Million pcs/yr ≈ 20-28t/yr
ST6.3×32-80mm	80-110pcs/min.	120-180pcs/min.	~80pcs/min.	~28.8 Million pcs/yr ≈ 38-55t/yr
ST8×50-100mm	50-90pcs/min.	80-110pcs/min.	~50pcs/min.	~18.0 Million pcs ≈ 70-100t/yr

Note: Output drops significantly at max size due to longer feed and roll cycle time. This is inherent to self-tapping screw geometry.

6. Material & Finishing

Wire: C1018 / C1022A / 10B21 low-carbon cold heading wire

Case hardness: approx. HV450–560

Core hardness: approx. HRC 25–35

Zinc plating: general corrosion resistance

Black phosphate: indoor, dry environments

Ruspert / ceramic coating: humid or semi-corrosive environments

7. Line Configurations We Offer

Basic line:

1 header + 1 thread roller + simple furnace + manual packing

Good for trial production or small self-tapping screw plant.

Standard Line:

Wire drawing + 1D2B/2D2B header + high-speed thread roller + mesh-belt heat treatment + zinc/phosphate line + automatic packing

Best choice for standard self-tapping screw plant.

High-Speed Line:

Dual headers + dual rollers + online inspection + robotic/collated packing

For large-scale industrial base.

8. Our Scope as Turnkey Integrator

We design and supply the complete line:

Line configuration by product mix and target capacity

Machine sourcing from verified Chinese fastener-equipment makers

Factory layout and material flow drawing

Tooling and die list (header dies, thread rolls, cutting dies)

Heat-treatment recipe and phosphate process parameters

English operation manuals and spare-parts list

Installation supervision/remote commissioning

After-sales coordination with equipment suppliers

9. Why Buyers Choose a China-Made Turnkey Line

Lower CAPEX than European/Japanese lines

Mature supply chain for headers, rollers, furnaces, plating lines

Fast delivery for emerging-market greenfield plants

Spare parts and consumables are economical

10. Equipment Data

Mesh-belt heat treatment furnace: carburizing + quench + temper, 60–300 kg/h (typical 150–250 kg/h)

Zinc plating line: 150–300 kg/h standard

Black phosphate line: 200–400 kg/h

Cold heading machine: wire M2.2–M8, max blank 150 mm, 50–220 pcs/min by size

Thread rolling machine: flat-die, M2.2–M8, max 150 mm, 80–380 pcs/min by size

Optical sorter: 120–350 pcs/min, checks head, length, thread, crack, point

FAQ:

Q: Can one line make all head types (pan, countersunk, truss, hex washer)?

Yes, by changing header tooling (punches and dies). Head changeover typically takes 2–4 hours including setup and first-piece inspection.

Q: Do you supply the steel wire?

We can recommend verified Chinese wire mills (C1022A, 10B21, C1018). Many clients buy wire locally to save freight; we provide full material specifications so your local supplier can match.

Q: What point type should I choose for my market?

Type A (sharp) for sheet metal, plastic, and wood-based panels. Type AB for brittle materials like thin plastic. Type B (blunt) for thicker sheet and pre-drilled holes. Type F (cutting slot) for castings and heavy gauge. We help you select based on your target application.

Q: What coating should I choose?

Zinc plating for general corrosion resistance and outdoor use. Black phosphate for indoor, dry environments. Ruspert or ceramic coating for humid, coastal, or semi-corrosive conditions. We configure the surface-treatment section accordingly.

Q: Can the line handle both carbon steel and stainless steel?

A: Carbon steel (C1022A / 10B21) is standard. Stainless (A2-304, A4-316, 410) requires different tooling material and 20–30% slower speeds due to work hardening. Let us know if stainless is in your product plan.

Q: How long does tooling last?

A: Header punches: 500,000–1,000,000 pieces depending on wire quality and size. Thread rolling plates: 2,000,000–5,000,000 pieces. We supply spare tooling lists and can provide drawings for local resharpening or reorder.

Q: What is the changeover time between sizes?

A: Wire diameter change: 30–60 minutes. Length change on header: 15–30 minutes. Thread roll change: 20–40 minutes. Full changeover from M3 to M6 including all tooling: half a day to one day.

Q: Do you provide operation manuals and training?

A: Yes. English operation manuals, tooling changeover guides, heat-treatment recipes, and coating parameters are included. On-site installation, commissioning, and operator training are part of the turnkey scope. HMI in English, Spanish, Arabic, or French.

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