China Zipper Pin Box for Garments and Jackets Factory
A zipper pin box is a precision‑molded component that houses the slider stop pin, providing repeatable engagement force and protecting the pin from deformation during high‑speed sewing operations. In garment production lines, consistent pin box performance reduces slider misfeeds, minimizes needle breakage, and extends the service life of zipper assemblies.
Technical Specifications
| Parameter | Typical Value | Unit |
|---|---|---|
| Overall Length | 12.0 | mm |
| Width (max) | 6.5 | mm |
| Height | 4.0 | mm |
| Pin Hole Diameter | 2.0 | mm |
| Material Hardness (Shore D) | 78 ± 2 | — |
Material Composition
The pin box is manufactured from polyoxymethylene (POM) copolymer, selected for its low moisture absorption, high fatigue resistance, and consistent dimensional stability across temperature ranges typical of garment finishing (−20 °C to 80 °C). Additives include a UV stabilizer package to prevent surface embrittlement during outdoor storage and a lubricant package that reduces friction between the pin and slider during actuation.
- POM copolymer base – provides tensile strength > 60 MPa and flexural modulus ≈ 2.8 GPa.
- UV stabilizer (hindered amine light‑absorber) – extends outdoor service life > 12 months without noticeable color shift.
- Internal lubricant (silicone‑based) – maintains coefficient of friction ≤ 0.15 under dynamic loading.
Applications in Garment Manufacturing
Zipper pin boxes are installed on the bottom stop of metal or polyester coil zippers used in jackets, workwear, and sports apparel. Because the pin must withstand repeated impact from the slider during each closure cycle, the box’s geometry controls the pin’s travel distance, preventing over‑extension that could damage the slider teeth. A well‑dimensioned pin box therefore reduces field returns caused by slider detachment and improves overall seam integrity.
In high‑volume production lines operating at 800–1200 cycles per minute, the low‑friction POM material minimizes heat buildup, preserving dimensional tolerance over millions of cycles. This characteristic is especially valuable for manufacturers that require OEM‑grade zipper performance without frequent tooling adjustments.
Customization Options
Pin boxes can be tailored to match specific zipper coil widths, slider designs, and pin lengths. Adjustments are made through mold modifications that affect the internal cavity dimensions while preserving the external mounting footprint.
- Cavity length – adjustable from 10.0 mm to 14.0 mm in 0.5 mm increments.
- Pin hole diameter – available in 1.8 mm, 2.0 mm, and 2.2 mm to accommodate different pin shank sizes.
- Mounting flange thickness – scalable from 0.8 mm to 1.5 mm for varying panel thicknesses.
- Color – standard natural (white) or custom pigmented (black, navy, OD green) upon request.
Quality Control Philosophy
Each production lot undergoes incoming material verification via FTIR spectroscopy to confirm POM copolymer grade and additive concentrations. Dimensional inspection is performed on a sampling basis using a coordinate measuring machine (CMM) with a repeatability of ±2 µm, focusing on cavity length, width, and pin hole concentricity.
Functional testing includes a slide‑force cycle test where a representative slider is actuated 100,000 times at 60 cpm while measuring peak insertion force; acceptance criteria limit force variation to ≤5 % of the mean. Visual inspection under 10× magnification checks for flash, burrs, or surface defects that could impede slider movement.
Packaging and Shipping
Pin boxes are packed in anti‑static, moisture‑barrier bags containing 5,000 units each, then placed in corrugated cartons with internal dividers to prevent shifting during transit. Cartons are sealed with pressure‑sensitive tape and labeled with lot number, material grade, and quantity for traceability.
For export shipments, pallets are stretch‑wrapped and fitted with corner boards to protect against impact. Standard lead time from receipt of approved tooling to first article delivery is 3–4 weeks, depending on cavity complexity and current machine load.
Frequently Asked Questions
- Can dimensions be customized? Yes, cavity length, pin hole diameter, and flange thickness can be adjusted per drawing; tooling changes are quoted separately.
- What information is required before quotation? Required data include zipper coil width, slider type, pin length, desired material grade, and annual volume estimate.
- What materials are available? Standard offering is POM copolymer; alternative engineering thermoplastics such as PBT or PET are available upon request for specific temperature or chemical resistance needs.
- How is quality inspected? Incoming material verification, CMM dimensional checks, slide‑force cycle testing, and visual inspection under magnification constitute our standard QC protocol.
- What packaging methods are available? Standard packaging is anti‑static bags in cartons; custom options include reusable trays, vacuum‑sealed packs, or palletized bulk containers.
- How are export shipments protected? Shipments are palletized, stretch‑wrapped, and corner‑boarded; additional insurance and fumigation certificates can be arranged on request.
- What is the typical production lead time? First article delivery typically occurs within 3–4 weeks after tool approval; repeat orders ship within 1–2 weeks depending on schedule.
- How are samples arranged? Sample kits of 50 units are shipped via express coupons after receipt of a signed sample request form; sample cost is credited against the first production order.
Contact for Technical Inquiry
To discuss custom pin box specifications, request a detailed quotation, or arrange a sample shipment, please provide your project requirements via the contact form. Our engineering team will respond with a feasibility review and lead‑time estimate within one business day.