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Overview  |  Part Design Guidelines  |  Specifications  |  MHN Design Information
Die Buttons and Retainers  |  Tooling Standards  |  Troubleshooting
Tooling Set-Up and Alignment Procedures   

Part Design Guidelines

MHN Series Round Pierce Nuts are precision made, work hardened, high quality threaded fasteners that can be installed in sheet metal stampings by the same presses and the same dies used to form the part.  Available in bulk form, MHN Series Round Pierce Nuts pierce their own hole through a sheet metal panel, offering substantial savings in time and materials over other fasteners.  MHN Series Round Pierce Nuts are also available with non-threaded holes, ideal for thread forming screws.

 When a Forming Operation Follows a Pierce Nut Operation

Do not form part closer than width of nut (W) when nut is installed as shown in view “A”,  below. Tooling alterations are necessary to reduce “W ” below 7 mm,  consult your representative.

 

 

Application Special Materials

 For HSLA, stainless steel, aluminum, or plastic material, consult your representative.

 Direction of Assembled Load

Assembled load must be against shoulders of nut.

Nut Edge to Panel Edge Distance

 

T
(Metal Range)		 D (Min)
MM IN
1.5mm or less
.060 in		 3.0 0.12
1.6mm or more
.061 in		 2 x T 2 x T

Emboss Requirements

MHN Series Round Pierce Nuts require no emboss.

Nut to Flange Distances (with Standard Installation Tooling) 

Note:  Closer nut-to-flange distances may be achieved using altered standard and/or special tooling.  Consult your representative.

 * Flat surface up to 48.0 mm (1.90 in.).  If dimension exceeds 48.0 mm, consult your representative

 

 

 

 

 

Nut Number N A B
MHN06 18.0 68.0 52.0
MHN08 19.0 68.0 52.0
MHN10 20.5 68.0 52.0
MHN12

-

-

-

Minimum Nut Spacing (With Standard Installation Tooling)

 

Closer spacing may be achieved using altered standard and/or special tooling.  Consult your representative.

Operation

MHN Pierce Nuts are fed through a chute attaching block connected to the head assembly. The nuts are fed automatically into ready position. The press, when lowered, forces the plunger to drive the nut into the part, supported by a die button. The die button forms the part material into the Pierce Nut undercuts, securing the nut in position.

Die Design Information

  • Other operations may be included in dies installing nuts.
  • Counterbore upper die shoe for shank and spring.
  • Part and nut sensing is suggested for most applications.
  • Show oil lines, fittings and manifolds for multiple head installations on drawings.
  • If possible, position each head to allow access to the proximity probe, oil hole on side of base and shank travel pin.
  • Allow room for entry of the chute attaching block and plastic nut guide. Arrange head so plastic nut guide does not interfere with press operation.
  • Piercing up from lower die shoe is possible; consult your representative for slug clearance hole requirements.
  • For all unique or special applications, consult your representative.

Ordering Information

When ordering, specify:

  • Pierce Nut number
  • Length of head extension (if any)
  • Alteration (if any)

For applications requiring alterations to standard tooling, contact our Sales Department.

Plan View Upper Die Shoe Spring - Pocket Counterbore
Side View Front View
Head Mounting Dimensions - View Through Upper Die Shoe from Top

MHN Series Pierce Nut Head (Non-Error Proofing)

All dimensions in metric

Nut Size Ext. Shut Height Open Height Stroke C D
MHN06 STD 143.0 180.0 37.0 25.0 34.5
25 168.0 230.0 62.0 50.0
MHN08 STD 143.0 180.0 37.0 25.0 34.5
25 168.0 230.0 62.0 50.0
MHN10 STD 143.0 180.0 37.0 25.0 38.0
25 168.0 230.0 62.0 50.0
MHN12 STD - - - - -
25 - - - -

MHN Series Pierce Nut Head (Error Proofing)

Nut Size Ext. Shut Height Open Height Stroke C D
MHN06 STD - - - - -
25 - - - -
MHN08 STD - - - - -
25 - - - -
MHN10 STD 178.0 234.0 56.0 25.0 38.0
25 203.0 284.0 81.0 50.0
MHN12 STD - - - - -
25 - - - -

Components

Feeder

Because MHN Round Pierce Nuts are pushed by air pressure from the feeder to the Installation Head in the Feed System, the Feeder can be mounted at any level you choose.

Nut Guide

The plastic Nut Guide is connected between the Feeder and the Installation Head. When setting up the system, careful attention must be taken not to kink this component. Generally a three foot radius is used to ensure efficient operation.

Installation Head

The MHN Nut Installation Head is mounted in the upper die shoe of the press. It is air-controlled and designed to accurately install MHN Round Pierce Nuts using the mechanical force of the press.

Die Button and Retainer

The Die Button is secured in a Retainer, which is mounted in the lower die shoe. When the press closes, the Installation Head punches the MHN Round Pierce Nut through the metal panel supported by the Die Button.

Probing

The MHN installation system includes a probe in the Installation Head which, when properly connected through the Nut Detection Panel with the press, will prevent cycling the next stroke unless a Nut is correctly positioned in the nose. Note: The customer must monitor removal of the stamping prior to the next cycle of the press.

 
 

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Taylor, MI  48180-1872
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This page last modified 06/08/07 .
All information © 2007 Whitesell International Corporation

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