Product Overview

Screw slotting machines mill slots and grooves into screw heads using a double-cutter opposing milling process, in which two cutters engage the workpiece simultaneously from opposite sides. This produces burr-free slots directly off the machine, removing the need for a separate deburring step.

SourcingProChina sources and supplies screw slotting machines with variable frequency drive control and automatic feeding for fastener manufacturers. Four model variants are available, differentiated by screw diameter range, production capacity, and slotting method — suitable for standard screw grooving, hex head directional slotting, and non-standard large-workpiece slotting. 

How to Select the Right Model

Match your screw specification to the model range before requesting a quote:

• Screws up to M4, length 2-35mm → ZX1.2-4
• Screws φ2.5mm-φ8.0mm, length 3.5-50mm, standard slot → ZX2.5-8
• Hex head screws φ2.5mm-φ10mm, across-flats 5-16mm → HZX2.5-8
• Non-standard/large workpieces, cutter OD φ80-150mm → Non-Standard Precision Slotting Machine

Request a Quotation for Your Screw Specification →

Core Technical Parameters

Model: ZX1.2-4 – Precision Burr-Free Screw Slotting Machine

Model: ZX2.5-8 – High-Speed Precision Slotting Machine

Model: HZX2.5-8 – Hex Head Screw Directional Slotting Machine

Model: Non-Standard Precision Slotting Machine

Key Features

Double-Cutter Opposing Milling Technology

Two cutters mill the slot from both sides of the screw head simultaneously, which prevents the material displacement that typically causes burr formation.

Burr-Free Output

Slots require no secondary deburring, removing one full production step and its associated labor and handling time.

Variable Frequency Speed Control

Milling cutter speed and turntable speed are independently adjustable, allowing parameters to be tuned to different screw materials and specifications.

Automatic Hex Head Positioning (HZX series)

The HZX2.5-8 automatically orients hex heads before edge and corner milling, so slot placement stays consistent across the production run.

Vibration Feeding System

An on-demand vibratory feeder supplies screws to the cutting station, reducing jamming and misfeed interruptions during continuous runs.

Operator Interface

Control layout is designed to reduce operator training time. 

Application Scenarios

• Screw head slotting (straight slots / cross slots)
• Hex head screw edge milling and corner milling
• Non-standard large workpiece slotting
• Precision fastener grooving for M2-M10 range
• Custom screw head machining for OEM fastener orders
• High-volume slotting for fastener production lines

FAQ

Q1: What does 'burr-free' mean, and why does it matter for buyers?

A: Burr-free means the slot is produced clean, without raised edges or protrusions, in a single milling pass. This removes the need for a separate deburring operation, which lowers per-unit labor cost and reduces the risk of inconsistent finish across a production batch.

Q2: How does double-cutter milling produce a burr-free result?

A: Two cutters mill the screw head from opposite sides at the same time. Because the cutting force is balanced on both sides, the material doesn't get pushed outward into a burr the way single-side milling can.

Q3: Which screw sizes fit which model?

A: ZX1.2-4 covers screws up to M4 (length 2-35mm). ZX2.5-8 covers φ2.5mm-φ8.0mm screws (length 3.5-50mm). HZX2.5-8 is for hex head screws φ2.5mm-φ10mm with across-flats 5-16mm. For larger or non-standard workpieces (cutter OD up to φ150mm), the Non-Standard Precision Slotting Machine applies.

Q4: Can one machine produce different slot types?

A: Yes. Straight slots, cross slots, and custom groove profiles are achievable by changing cutter selection on the ZX/HZX series. The HZX series additionally supports edge milling and corner milling specific to hex heads.

Q5: What production output can I expect?

A: Output depends on model and screw spec: ZX1.2-4 runs 50-350 units/min, ZX2.5-8 runs 50-500 units/min, HZX2.5-8 runs 40-100 units/min (lower due to hex positioning steps), and the Non-Standard model runs 10-50 units/min for larger workpieces.

Q6: Do you offer machines for non-standard specifications?

A: Yes. The Non-Standard Precision Slotting Machine variant handles workpieces up to φ150mm cutter OD and custom slotting patterns. Share your screw drawing or spec sheet with our team for a feasibility check and quotation.

Send Your Screw Drawing / Spec Sheet for a Quotation →

Ordering Information

• MOQ: 1 set (subject to final confirmation)
• Delivery Time: 30-45 days after order confirmation for standard models
• Customization: Non-standard specifications and custom tooling available on request
• Payment Terms: T/T, L/C (negotiable)
• Warranty: 12 months from commissioning
• Packaging: Export-standard packaging with protective film and wooden crates
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For model selection support, technical drawings, or a formal quotation, contact the SourcingProChina sourcing team directly.

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Get a Free Quotation