Marson M47425 Poly-Nut Expander Inserts, #8-32 Steel Rivet Nut Inserts, Low Profile, Zinc Plated, 50-Pack

The Marson M47425 Poly-Nut Expander Inserts are designed to provide strong, permanent threads in thin materials where traditional tapped threads are not practical. These #8-32 steel inserts install from one side and are ideal for use in sheet metal, fiberglass, rigid plastics, and other thin materials. Their low-profile design delivers a clean, nearly flush appearance while providing vibration-resistant captive threads for long-lasting fastening performance.
Features:
- Creates Permanent Threads in Thin Materials – Ideal for sheet metal, fiberglass, and rigid plastic applications that are too thin for standard tapped threads.
- One-Sided Installation – Easily installs from one side of the workpiece for convenient assembly and repairs.
- Low Profile Head Design – Provides a clean, nearly flush installed appearance.
- Vibration Resistant – Designed to resist loosening and spinning after installation.
- Steel Construction with Zinc Finish – Durable steel body with zinc clear trivalent chromate coating for corrosion resistance.
- Cost-Effective Fastening Solution – Lightweight installation tooling reduces labor and assembly costs.
Description:
- Poly-Nut / Rivet Nut Insert
- Style: “O” Style Round Body
- Thread Size: #8-32 UNC-2B
- Head Style: Low Profile
- Material: Steel
- Finish: Zinc Clear Trivalent Chromate
- Grip Range: 0.020 Inch to 0.080 Inch
- Installation Type: Blind Installation
Specifications:
- Manufacturer: Marson
- Part Number: M47425
- Thread Size: 8-32
- Body Length (L): 0.410 Inch
- Head Diameter (W): 0.287 Inch
- Body Diameter (Lip): 0.249 Inch
- Grip Range (Min): 0.020 Inch
- Grip Range (Max): 0.080 Inch
- Hole Size (Min): 0.250 Inch
- Hole Size (Max): 0.254 Inch
- Recommended Drill Size: 1/4 Inch
- Quantity: 50 Pieces
Applications:
- Automotive body panels
- Fiberglass assemblies
- Rigid plastic fastening
- Sheet metal fabrication
- Industrial equipment assembly
- Blind fastening installations
The Marson M47425 Poly-Nut Inserts are also commonly referred to as rivet nuts, blind threaded inserts, expander inserts, threaded insert nuts, steel rivnuts, or captive thread inserts.

Q: What materials can these inserts be used in?
A: These inserts are designed for thin materials including sheet metal, fiberglass, and rigid plastics.

Q: What size fastener do these inserts accept?
A: The inserts feature #8-32 UNC internal threads.

Q: What hole size is required for installation?
A: The recommended installation hole size is 1/4 inch (0.250” to 0.254”).

Q: How many inserts are included?
A: Each package contains 50 steel Poly-Nut expander inserts.

Brand	Marson
Thread Size	8-32
Material	Steel
Type	Nut Inserts
MPN	M47425
Model	M47425

Marson M47425 #8-32 Steel Poly-Nut Expander Inserts, 50 Pieces

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