Flat Poly Bags 9″ x 12″ 4 mil 1000/CTN

CNC Parts & Precision Hardware Poly Bags 9×12 — 4 mil LDPE | 1000

These 9″ x 12″ flat poly bags are manufactured from 4 mil 100% virgin LDPE resin — a heavy-duty gauge suited for CNC machined parts, precision hardware components, and industrial sub-assemblies where puncture resistance and bag integrity are critical. The side-weld construction provides extra corner strength for parts with sharp edges or irregular profiles.

Specs: 9″ x 12″ | 4 mil | 100% Virgin LDPE | 1000/Ctn | FDA/USDA Compliant

Applications

• CNC machined parts and turned components packaging for industrial distributors
• Precision hardware kitting — bolts, bushings, pins, and fastener sets
• Stamped and formed metal parts bagging for OEM shipment
• Prototype and inspection sample protection in machine shops
• MRO supply packaging for maintenance and facilities departments

Features

• 4 mil heavy-duty LDPE — resists puncture and tearing from sharp-edged metal parts
• Strong bottom seal or side-weld construction for maximum load integrity
• Open-end format — compatible with heat sealing, twist-tying, stapling, or taping
• 100% virgin resin — consistent clarity and gauge throughout the case
• FDA/USDA compliant resin — suitable for food-adjacent packaging applications

Material Notes

Made from 100% virgin Low Density Polyethylene (LDPE) resin. At 4 mil nominal thickness, these bags provide substantially greater puncture resistance than standard 2 mil bags — appropriate for metal components with burrs, sharp protrusions, or rough cast surfaces. LDPE remains flexible at lower temperatures, reducing brittleness during cold storage or shipping.

Use Case Notes

The 9×12 footprint is well-suited for mid-size parts: shaft assemblies, gear sets, valve bodies, bearing housings, and small sub-assemblies. Frequently used in production facilities for kitting and staging components ahead of assembly line operations. The open-end format allows operators to insert parts and seal on the line without pre-opening bags.

Common Questions

Q: Why use 4 mil instead of 2 mil for hardware parts?
A: 4 mil provides significantly greater puncture and tear resistance when bagging metal components with sharp edges, threads, or cast surfaces. 2 mil bags are prone to puncture during handling in these applications. 4 mil also holds up better in stacked storage and shipping.

Q: Can these bags be heat sealed?
A: Yes. The open-end LDPE construction is compatible with impulse heat sealers. They can also be closed with twist ties, bag clips, staples, or tape depending on the application.

Q: Are these bags FDA/USDA compliant?
A: Yes. The resin meets FDA/USDA specifications, making these suitable for food-contact applications in addition to industrial use cases.

Why Buy

These 9×12 4 mil LDPE bags offer a practical, high-volume solution for industrial parts packaging where bag integrity matters. The 1000-count carton supports high-throughput kitting, staging, and shipment workflows in machine shops, OEM production facilities, and industrial distribution operations. Virgin LDPE resin ensures consistent thickness and performance across the entire case run.