FS-440-1 Self-Clinching Flush Nut, Stainless Steel

Product Overview

The FS-440-1 is a stainless steel self-clinching flush nut with a .112-40 (#4-40) unified thread and shank code 1. Its hexagonal base and cylindrical clinching section are designed for press installation in prepared sheet material, providing a permanent internal thread with a low-profile flush installation.

Key Features

• Exact product number: FS-440-1

• Product series: FS stainless steel flush nut

• Thread specification: .112-40 (#4-40)

• Thread code: 440

• Shank code: 1

• Mounting hole diameter: .172 in

• Applicable sheet thickness: .060-.090 in

• Dimension A: .060 in

• Dimension C: .171 in maximum

• Dimension H: .188 in nominal

• Minimum edge distance: .23 in

Exact Specifications

The following reference values are taken from the FS-440-1 entry in the LAMBOOR standard fastener catalog. All dimensions are in inches.

• Product number: FS-440-1

• Product type: self-clinching flush nut

• Material: stainless steel

• Thread specification: .112-40 (#4-40)

• Thread code: 440

• Shank code: 1

• Mounting hole diameter: .172

• Applicable sheet thickness: .060-.090

• Dimension A: .060

• Dimension C: .171 maximum

• Dimension H: .188 nominal

• Minimum edge distance: .23

Part Number Breakdown

FS identifies the stainless steel flush-nut series, 440 identifies the #4-40 thread code and 1 identifies the shank code for the listed sheet-thickness range and A dimension. Use the complete FS-440-1 product number for quotation and order confirmation.

Installation and Sheet Requirements

Prepare a .172 in mounting hole in sheet material between .060 and .090 in thick, and maintain at least .23 in from the hole centerline to the sheet edge. Install the nut with compatible self-clinching press tooling and a parallel pressing force so the nut seats at the required flush position.

Confirm the sheet material, hardness, hole preparation, tooling and press conditions against the approved installation instruction before production.

Material and Finish

The FS prefix identifies the stainless steel model in this catalog family. The catalog does not assign a separate surface finish or stainless steel grade to the FS-440-1 row.

Any passivation, grade, appearance or documentation requirement should therefore be stated on the approved order rather than inferred from external listings or the product photograph.

Selection and Related Variants

Select shank code 1 for the catalog-listed .060-.090 in sheet-thickness range and .060 in A dimension.

The same #4-40 row also lists shank code 2 for sheet thickness of .091 in and above, with an A dimension of .090 in. Do not substitute FS-440-2 or another thread code without checking the sheet thickness and assembly requirements.

Use Conditions

This nut is intended for sheet assemblies that need a permanent #4-40 internal thread with minimal projection at the installed surfaces. Suitability depends on the sheet material, thickness, mounting-hole preparation, edge distance and approved press tooling.

Ordering Information

For quotation or order confirmation, provide FS-440-1, quantity, sheet material and thickness, mounting-hole preparation, required finish, packaging and inspection documentation.

Confirm current stock, price, minimum order quantity and lead time for each order.

Frequently Asked Questions

What does FS-440-1 identify?

FS-440-1 identifies an FS-series stainless steel self-clinching flush nut with a .112-40 (#4-40) thread and shank code 1. Use the complete product number when requesting a quotation or confirming an order.

What sheet thickness and mounting hole are required?

The catalog specifies a .060-.090 in sheet-thickness range and a .172 in mounting hole for FS-440-1. Maintain the listed .23 in minimum edge distance and verify the sheet material, hardness and approved installation instruction before production.

How does shank code 1 differ from shank code 2?

Shank code 1 is listed for .060-.090 in sheet thickness with an A dimension of .060 in. Shank code 2 is listed for sheet thickness of .091 in and above with an A dimension of .090 in. Select the code from the actual sheet thickness rather than treating the two versions as interchangeable.

What do dimensions A, C and H represent for ordering?

For FS-440-1, the catalog lists A as .060 in, C as .171 in maximum and H as .188 in nominal. These dimensions describe different parts of the nut geometry and should remain labeled when checking the part against an approved drawing or sample.

What material and finish are specified?

The FS model is specified as stainless steel. The catalog row does not state a separate surface finish or stainless steel grade for FS-440-1, so any passivation, grade, appearance or documentation requirement should be written into the approved order instead of being inferred from competitor pages or the photograph.

What information should be supplied when ordering?

Provide FS-440-1, quantity, sheet material and thickness, mounting-hole preparation, required finish, packaging and inspection documentation. Confirm current stock, price, minimum order quantity and lead time for the specific order.