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Stud Panel Preparation
for Ring Head, Knurled, and
Tamper Resist Studs

Note: The installation procedures for the Ring Head, Knurled, Head and Tamper Resist Head Studs are identical to the installation procedures for the Oval Head Studs except that the studs are flat and use a Flat Surface Plate in place of the Support Block.

Note: Support Preparation is covered under Receptacle Installation

Stud Panel Preparation With 1219-R, 127P, 127H, and 1219-24

The drawings below all show the stud retainer being absorbed by either a counterbore in the panel, or by the space created through use of a gasket or interposed sheet between the panel and support. If neither option is feasible, the retainer thickness can also be absorbed by either the support or the receptacle when utilizing a 1219-L, 1218-P, 1219-QC4 or 1219-PS receptacle.


Snap Ring

Snap Ring Retainer being absorbed


Push-on Grommet

Plastic Grommet being absorbed


Flattened Half Grommet

Aluminum Grommet being Absorbed


Retaining Spring

Retaining Spring being absorbed

Standard Panel Hole
for 127P, 127H,
1219-R, and 1219-24
Oversize Panel Hole*
For 127P and 127H
+ .010
+ .010
3 3/16" 7/32"
4 1/4" 5/16"
5 5/16" 3/8"
65 13/32 15/32"

When using a Gasket or Interposed Sheet, the hole should be sufficiently larger than the outer diameter of the stud retainer to allow free entry of the retainer

* An oversized panel hole allows the stud to float which can compensate for panel-to-support misalignment. Do not use with 1219-R snap ring retainers.

1219-R, 127P, and 1219-24 Retainer Installation

9906-RS HAND TOOL is used to push the retainer over a Tapered Mandrel (included) and over the cam end of the stud until it reaches the undercut. Once the retainer reaches the undercut, it snaps back to its original size and prevents the stud from coming out of the panel.

Any flat block may be used to support the Ring Head, Knurled Head, and Tamper Resist Studs while the retainer is attached.

1. Place the stud, head down, on the support. Put the stud through the panel.  
2. Place the retainer on mandrel.  
3.Align ring or spring ends so that they will miss the stud cam.  
4. Place the mandrel in end of stud cam and place the tool over mandrel
Part Number
3 9906-RS-3-BB
4 9906-RS-4-BB
5 9906-RS-5-BB
65 9906-RS-65-BB
5. Push retainer until it is seated in the stud undercut.

Snap Ring

Snap Ring Installation with Tooling Identification


Push-on Grommet


Retaining Ring

Retaining Spring Installation with Tooling Identification

127H Half Grommet Retainer installation

1. Place the stud head on the support and place the stud through the panel. Use a Flat Surface Plate in place of the block.    
2. Place the retainer on the stud cam. For a Standard Hole, the small diameter faces the panel. For an Oversize Hole, the large diameter faces the panel.   Aluminum Half Grommet Installation Drawing
Standard Hole: Small
Diameter Faces Panel
Aluminum Half Grommet Installation Oversized Hole Drawing
Oversize Hole: Large
Diameter Faces Panel
3. Use the tool to flatten the grommet against the panel.
Stud Size Tool Part Number
3 9916-5-13-BB
4 9916-5-14-BB
5 9916-5-15-BB
65 9916-5-165-BB
Aluminum Half Grommet Clinching

In this case, the 127H Half Grommet Retainer is flattened against the underside of the panel and can cause a gap between the panel containing the stud and the support containing the receptacle. Dimpling the support will allow the panel and support to come into direct contact by allowing the retainer to fit in the dimple. See S-Spring Receptacle Dimpling Tool.

Stud Panel Preparation With 1271 Full Grommet

Full Grommet being Absorbed by gasket

1271 Retainer wall thickness is absorbed by gasket, interposed panel, or by dimpled support.

Full Grommet being absorbed by counterbore

Underside of panel hole is counter bored to depth equal to 1271 Retainer wall thickness.

Stud Size Dim. A* Dim. 
Dim N
3 7/32"* 11/32" .020"
4 5/16"* 15/32" .030"
5 3/8"* 19/32" .035"
65 1/2" 25/32" .045"

* If application requires, size hole +.005/+.010 larger then Dim. A

Note: Dimpled panels require dimpled supports.

1271 Full Grommet Retainer Installation

1. Insert Grommet in Panel Hole Insert Grommet Drawing
2. Set Grommet. Use a Flat Surface Plate in place of the block.
Stud Size Tool Part Number
3 9916-1-13-BB
4 9916-1-14-BB
5 9916-1-15-BB
65 9916-1-165-BB
Set Grommet Drawing with Tooling Identification
3. Insert Stud Insert Stud Drawing
4. Clinch Grommet. Use a Flat Surface Plate in place of the block.
Stud Size Tool Part Number
3 9916-3-13-BB
4 9916-3-14-BB
5 9916-3-15-BB
65 9916-3-165-BB
Clinch Grommet Drawing with Tooling Identification

To order installation tools as a set use Part Number:

Stud Size Tool Set*
Part Number
3 9920-1-3-BB
4 9920-1-4-BB
5 9920-1-5-BB
65 9920-1-65-BB

* Removal tools are not part of the set and must be ordered separately.

Stud Removal

An installed 1271 or 1276 grommet may be removed by shearing off its underside flange with a staking tool.

Use a Flat Surface Plate in place of the block.

Tool Part Number
3 9919-A-3-BB
4 9919-A-4-BB
5 9919-A-5-BB
65 9919-A-65-BB

Stud Removal Drawing

127S-F Thick Panel Grommet Retainer installation

1. Using diameter specified in the table, make the hole in the panel for light press fit grommet. If loose fit is needed, size the hole diameter +.005/+.010"
Stud Size Hole Dia.
3 .219"
4 .313"
5 .375"
2. Press grommet/stud assembly into hole Note: This stud panel hole permits use of S-Spring receptacles without a dimpled stud hole in support.
3. Flare grommet. Use a Flat Surface Plate in place of the block.
Stud Size Tool Part Number
3 9906-A-3-BB
4 9906-A-4-BB
5 9906-A-5-BB
4. Flatten grommet. Use a Flat Surface Plate in place of the block.
Stud Size Tool Part Number
3 9916-3-13-BB
4 9916-3-14-BB
5 9916-3-15-BB