M012 M3x4 Cup-Head Screw for GK9 Portable Bag Closer

M012 M3x4 Cup-Head Precision Cutter & Linkage Retaining Screw for GK9 Portable Bag Closer

The M012 M3x4 Cup-Head Screw is a precision replacement fastener designed for GK9 portable bag closer machines. This compact M3 metric screw secures critical components such as the thread cutter blade, internal drive blocks, and linkage assemblies, helping maintain accurate machine timing and dependable bag-closing performance.

Despite its small size, the M012 screw plays an essential role in preventing movement of high-wear mechanical parts caused by continuous vibration. Replacing a worn or missing screw helps keep the cutter assembly and internal linkage system securely fastened for smooth operation and consistent thread trimming.

Important: This is an M3 × 4mm cup-head screw. Please verify the M012 part number, thread size, and your machine’s parts diagram before purchasing.

Why Choose the M012 Cup-Head Screw?

Small precision fasteners are often overlooked during maintenance, but they are critical to the safe operation of a portable bag closer. The M012 screw is manufactured for locations where limited space requires a compact cup-head design without compromising secure fastening.

Benefits include:

• Maintains secure cutter blade mounting
• Helps preserve internal linkage alignment
• Reduces loosening caused by machine vibration
• Supports accurate thread cutting
• Suitable for routine servicing and replacement
• Compact design for tight mechanical assemblies
• Precision metric threading for proper fit

Key Features

• M3 × 4mm precision metric screw
• Compact cup-head design
• Replacement retaining screw for GK9 machines
• Helps stabilize moving mechanical assemblies
• Designed for high-vibration operating conditions
• Easy to install during maintenance
• Supplied as 1 Piece

Machine Compatibility

The M012 Cup-Head Screw is compatible with portable bag closer machines built on the standard GK9 mechanical platform, including:

• GK9-2
• GK9-8
• GK9-18
• GK9-18A
• GK9-200
• GK9-350
• GK9-500
• GK9-900
• GK9-1001

It is also suitable for many compatible handheld bag stitching machines from:

• Newlong (equivalent handheld models)
• Flyingman
• Revo
• Gemsy
• Zoje
• Moonstar
• Other standard China-made GK9-style portable bag closers

Always compare your existing screw and machine parts diagram before ordering.

Common Assembly Applications

The M012 screw is used in several important mechanical assemblies throughout the machine.

A051 Driving Thread Cutter Blade

Secures the cutter blade firmly to the cutter arm block, allowing reliable automatic thread trimming after each stitched bag.

A066 Motor Armature with Bearing Assembly

Used for fastening accessory brackets or internal wiring guides located around the motor housing framework where applicable.

A067 L Rod Gutka Connection Block

Acts as a retaining fastener that helps maintain the position of alignment pins within the primary drive linkage system for smooth mechanical movement.

Supports Reliable Bag Closing Performance

Although the M012 screw does not contact the packaging material directly, it contributes to smooth cutter operation and stable internal timing when closing:

• Woven polypropylene (PP) sacks
• Jute bags
• Burlap bags
• Canvas bags
• Mesh bags
• Multi-wall paper bags
• Heavy-duty industrial packaging sacks

A properly secured cutter and linkage assembly helps reduce downtime and supports consistent stitching performance.

Installation Guide

1. Disconnect the machine from the power supply or remove the battery.
2. Locate the damaged or missing M012 screw.
3. Align the cutter blade or linkage component correctly.
4. Install the replacement M3×4 cup-head screw.
5. Tighten firmly without overtightening.
6. Rotate the handwheel manually to confirm smooth movement.
7. Test the cutter mechanism before returning the machine to service.

Machine Compatibility Table

Frequently Asked Questions

What is the size of the M012 screw?

The M012 is an M3 × 4mm precision metric cup-head screw specifically designed for selected GK9 portable bag closer assemblies.

Where is this screw commonly installed?

It is commonly used in the A051 Driving Thread Cutter Blade, A066 Motor Armature with Bearing Assembly, and A067 L Rod Gutka Connection Block.

Will this fit every GK9 portable bag closer?

It fits most machines built on the standard GK9 platform. Always verify your machine model and compare the original part before purchasing.

Can I replace it with a standard M3 screw?

Using a screw with a different head style or length may interfere with moving components. Replace it only with the correct M3×4 cup-head specification.

Does this screw improve thread cutting?

Yes. A securely mounted cutter assembly helps maintain proper blade positioning, contributing to cleaner and more consistent automatic thread cutting.

Is this a complete cutter assembly?

No. This listing includes one M012 M3×4 Cup-Head Screw only.