FHS-256-4 Self-Clinching Stud, Stainless Steel

Product Overview

The FHS-256-4 is a stainless steel flush-head self-clinching stud with a #2-56 thread and length code 4. Its round flush head and under-head clinching features are designed for press installation into a prepared sheet hole, providing an externally threaded mounting point.

Key Features

• Exact product number: FHS-256-4

• Product series: FHS stainless steel self-clinching stud

• Thread specification: .086-56 (#2-56)

• Thread code: 256

• Length code: 4

• Minimum sheet thickness: .040 in

• Mounting hole diameter: .085 in

• Maximum hole size in attached part: .105 in

• Head dimension H: .144 +/- .015 in

• Dimension S: .075 in maximum

• Minimum edge distance: .187 in

Exact Specifications

The following reference values are taken from the FHS-256-4 entry in the LAMBOOR standard fastener catalog. All dimensions are in inches.

• Product number: FHS-256-4

• Product type: flush-head self-clinching stud

• Material: stainless steel

• Thread specification: .086-56 (#2-56)

• Thread code: 256

• Length code: 4

• Minimum sheet thickness: .040

• Mounting hole diameter: .085

• Maximum hole size in attached part: .105

• Head dimension H: .144 +/- .015

• Dimension S: .075 maximum

• Minimum edge distance: .187

Part Number Breakdown

FHS identifies the stainless steel product series, 256 identifies the #2-56 thread code and 4 identifies the stud length code. Use the complete FHS-256-4 product number for quotation and order confirmation.

Installation and Sheet Requirements

Prepare a .085 in mounting hole in sheet material at least .040 in thick, and maintain at least .187 in from the hole centerline to the sheet edge. Install the stud with compatible self-clinching press tooling so the head seats against the sheet.

The mating or attached part should use a hole no larger than .105 in where this catalog limit applies. Confirm panel material, hardness, tooling and press conditions against the approved installation instruction before production.

Material and Finish

The catalog identifies FHS as the stainless steel model in this product family. It does not assign a separate coating or finish to the FHS-256-4 row. Any required passivation, appearance or documentation should therefore be stated on the approved order rather than assumed from the product image.

Selection and Ordering

Select FHS-256-4 when the required configuration is a stainless steel flush-head self-clinching stud with #2-56 thread and length code 4.

For quotation or order confirmation, provide the complete product number, quantity, sheet material and thickness, mounting-hole preparation, attached-part hole requirement, finish requirement, packaging and inspection documentation. Confirm current stock, price, minimum order quantity and lead time for each order.

Frequently Asked Questions

What does FHS-256-4 identify?

FHS-256-4 identifies the stainless steel FHS self-clinching stud series, thread code 256 for a #2-56 thread and length code 4. Use this complete number for quotation and order confirmation.

What sheet thickness and mounting hole are required?

The catalog specifies a minimum sheet thickness of .040 in and a .085 in mounting hole for the #2-56 FHS configuration. Maintain the listed .187 in minimum edge distance and verify the panel material and approved installation instruction before production.

What is the maximum hole size in the attached part?

The catalog lists .105 in as the maximum hole size in the attached part for this thread configuration. This is separate from the .085 in mounting hole used to install the stud in the base sheet, so the two hole requirements should not be interchanged.

What material and finish are specified?

The FHS model is specified as stainless steel. The catalog row does not state a separate surface finish for FHS-256-4. Any passivation, appearance or documentation requirement should be written into the approved order instead of being inferred from the photograph.

What information should be supplied when ordering?

Provide FHS-256-4, quantity, sheet material and thickness, mounting-hole preparation, attached-part hole requirement, required finish, packaging and inspection documentation. Confirm current stock, price, minimum order quantity and lead time for the specific order.