Sew-Through Button with Chamfered Thread Holes and Recessed Thread Groove

The problem

When a standard flat button is sewn onto a garment, the thread must bend as it enters the hole from the fabric side. During industrial sewing, this edge creates friction against the thread. Over time, or even during the initial attachment, the thread can fray and snap. According to the patent, the design aims to reduce the possibility of broken threads during sewing.

The solution

1. The button body (1) has one side provided with an inwardly recessed thread storage groove (2).
2. Multiple threading holes (3) pass completely through the button body. In the described embodiment, there are four holes.
3. On the side of each threading hole that faces the thread storage groove, the edge is shaped into an outwardly protruding arc chamfer (4).
4. The portion of the button body located between the four threading holes is depressed downward to form a groove (5).
5. Additional features described in the patent include an arc surface transition connecting the edge of the groove to the edge of the threading hole, via holes (6) passing through the upper and lower end faces within the groove, annular grooves (7) concavely formed on the inner walls of the threading holes, circular arc corners (8) on the edges facing away from the storage groove, gaps (9) recessed between adjacent holes, and circle supports (10) projecting upward between adjacent holes.

Who it is for

• Dress shirt manufacturers who run high-speed bartacking machines and need to minimize thread breaks on plackets and cuffs.
• Uniform and workwear brands whose garments undergo frequent washing and heavy abrasion, requiring secure button attachment.
• Garment accessory wholesalers supplying button blanks to factories looking for an upgraded four-hole option.
• Private-label fashion brands sourcing custom buttons and wanting a functional detail that improves garment longevity.

How it works

The main parts

Sewing sequence

1. Position the button on the garment fabric. The thread storage groove (2) is on one side of the button body.
2. Pass the needle up through the fabric and into one of the threading holes (3). The patent describes the arc chamfer (4) at the edge of the threading hole.
3. Cross the thread over the central groove (5) to the opposite hole. The depression forms a groove between the four holes.
4. Repeat until the required number of stitches is complete. The patent describes the storage groove as a recess for thread.
5. Tie off the thread. According to the patent, the chamfers and central groove can reduce the possibility of broken threads.

Applications

Dress shirts and blouses

Placket and cuff buttons on dress shirts are attached by high-speed automated sewing machines. The arc chamfer helps maintain consistent stitch quality across thousands of units per shift.

Workwear and uniforms

Industrial uniforms endure repeated commercial laundering and physical strain. The recessed storage groove and chamfered entry help distribute the load along the thread length.

Outerwear and jackets

Lightweight jackets use four-hole buttons for decorative and functional closures. When sewn through thick layers of lining and shell fabric, the rounded corners on both sides of the hole help the needle pull the thread through dense material cleanly.

Children’s clothing

Buttons on children’s garments face constant pulling and twisting. By smoothing the contact points inside the hole, the design helps keep the thread intact longer under rough handling.

Home textiles

Duvet covers, cushion panels, and decorative pillows sometimes use sew-through buttons as tufting anchors. The thread passes through thick batting. The chamfered hole geometry eases the thread path through these bulky assemblies.

Where it is less suitable

• Jeans and heavy denim - shank buttons or metal rivets are standard for waistbands because they handle shear forces better than any sew-through design.
• Blind-stitched hems - applications that require hidden stitching do not use four-hole face buttons.
• Extremely small buttons - buttons under about 8 mm in diameter may lack the surface area needed to mold the central groove and four chamfered holes effectively.