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Quarter Turn - ST-1200 Line
Manufactured in
the United States of America!
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The selection and installation planning of fasteners can influence
the security of the fastened parts. Product information and support
service is intended for use only by persons with mechanical
engineering qualifications sufficient to manage the
responsibilities of:
- Analyzing fastener performance in relation to the service
to be met, and
- Planning appropriate fastening locations and installations.
The following is a partial list of design criteria which should
be used in selecting the correct fastener for your application.
- Tensile Load (average)
- Shear Load (average)
- Maximum Load
- Vibration
- Number of Cycles
- Environmental Concerns
- Appearance
- Mounting Location and Clearance
- Weight
The above considerations, along with the
performance chart
parameters should be utilized in choosing the appropriate fastener
type, head style, receptacle, finish, and materials.
Selection Procedure
1. Select a fastener size, using the
performance table shown below. The
size selected applies to the stud, retainer, and receptacle.
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2. Select an appropriate stud head style.
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- Slotted (oval) (121J)
- Wing (121J-W)
- Flush (126J)
- Ring (122J-R)
- Phillips (121J-P)
- Hex (121J-H)
- Knurled (1211)
- Tamper Resist (1230)
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3. Select a stud retainer. Some criteria for
retainer selection are:
- Desirability of radial and axial stud play in the
unlocked position.
- Degree of protection needed for panel hole and outer
surface.
- Whether retainer may be allowed to cause a gap between
stud panel and receptacle support.
- Installation cost.
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- Plastic Half Grommet
- Stainless Steel Snap Ring
- Aluminum Half Grommet
- Aluminum Full Grommet
- Retaining Spring
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4. Select a receptacle type.
All of the ST-1200 Line receptacles, except the Press-In
type, provide the same optimum performance standards as
listed in the Performance Table.
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- S-Spring
(All Sizes)
- Weld Plate
(All Sizes)
- Slip-On
(Size 4 and 5 only)
- Clip-In
(Size 4 only)
- Rear Press-In
(Size 3 and 4 only)
- Front Press-In
(Size 4 only)
- Right Angle Spring Plate
(Size 3, 4, and 5 only)
- Side Spring
(Size 3, 4, and 5 only)
- Corner Spring
(Size 3, 4, and 5 only)
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5. Now determine the thickness of:
- the material in which the stud is retained (panel),
- any air gaps and any part of the stud retainer thickness
not buried in either the panel or support (gap), and
- the material to which the receptacle is attached (support).
Then determine the total pileup between the level of stud head
contact with the panel (top of Panel) and the level of receptacle
contact with the underside of the support (bottom of Support), in
the closed position. Refer to the examples on each receptacle page,
which will guide you to the Grip Length selection table.
6. Self-ejecting stud assemblies prevent stud play in the open
position and provide a visual cue of an open fastener.
Stud Part Numbers
The stud part number is divided into 5 parts.
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For example: |
121J-340-Z3CT |
121J-325-SS |
1. |
Head style: |
121J- = Slotted (oval) |
121J- = Slotted (oval) |
2. |
Shank diameter: |
3 = 3/16" |
3 = 3/16" |
3. |
Grip Length: |
40 |
25 |
4. |
Stainless Steel Identifier: |
Omitted |
-SS |
5. |
Finish suffix: |
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Omitted |
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ST-1200 LINE PERFORMANCE:
Fastener size: |
3 |
4 |
5 |
65 |
Stud End Diameter: |
3/16 (4.78 mm) |
1/4 (6.35 mm) |
5/16 (7.95 mm) |
13/32 (10.31 mm) |
Stud Head Diameter: |
5/16 (7.95 mm) |
7/16 (18.75 mm) |
9/16 (14.30 mm) |
11/16 (17.48 mm) |
Locked Service Tension (lb): |
20 |
30 |
45 |
55 |
Max. Tension w/o Distortion (lb): |
45 |
60 |
85 |
110 |
Rated Shear (lb): |
100 |
150 |
200 |
300 |
Wear Life (Thousands of uses): |
5 |
5 |
25 |
40 |
Maximum Sheet Separation at 150% of Locked Service Tension:
.05" (1.27 mm)
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