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ST-1200 Line Fastener Product Selector

ST-1200 Line Fastener components consist of a spiral-cam stud, a stud retainer, and a receptacle consisting of or containing a wire form spring.

As the stud is rotated, the 1/4-turn spiral cam engages the spring-wire receptacle and pulls it up and over the cam peak. The spring snaps into the detent at the end of the cam, holding the fastener in a firm locked tension. The cam peak resists opening rotation of a locked stud under vibration.

This form can be used to assist in determining the size of stud which will be required for your application. Fill in the requested information and click on the "Calculate" button. The results will be presented at the bottom of the page.

This process is the same as the Selection Procedure outlined in the catalog and on the ST-1200 Line page.

1. Select an appropriate head style.

ST-1200 Line studs in Sizes 3, 4, and 5, each in a variety of head styles, may be ordered as SE (Self Ejecting) assemblies. A stainless steel ejecting spring and a black plastic cup are sold attached to the stud. The SE ejection is partial, being limited by the length of the stud undercut not occupied by the cup, panel, and stud retainer. Ejection will normally be sufficient to give a visual cue of an unlocked stud. Also, ejecting spring tension holds an opened stud firmly, easing removal and replacement of vertical panels and panels with multiple fasteners.

2. Select a fastener size using this performance table:

Fastener size:
Stud End Diameter: 3/16"
(4.78 mm)
(6.35 mm)
(7.95 mm)
(10.31 mm)
Stud Head Diameter: 5/16"
(7.95 mm)
(11.13 mm)
(14.30 mm)
(17.48 mm)
Locked Service Tension (lb): 20 30 45 55
Max. Tension without Distortion (lb): 45 60 85 110
Rated Shear (lb): 100 150 200 300
Wear Life (Thousands of uses): 5 5 25 40

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, or must be absorbed into one of those materials or into the receptacle itself (nested).
  • Installed cost.

4. Select a receptacle type:

All of the ST-1200 Line receptacles provide the same optimum performance standards as listed in the performance table, so receptacle selection is primarily a matter of choosing the installation mode which provides the lowest installed cost, and perhaps finding a type that will fit in limited space.

If an enclosed receptacle is needed, selection is limited to the types available in the SU-2300 Line and the PA-3500 Line.

Note: Other types of receptacles are available but cannot be sized by this program. Please call for assistance.

5. Select an appropriate finish.

Stud Receptacle Suffix Description Specification(s)
---BOCBlack oxide over copper
sealer: clear acrylic dip
BOFBlack oxide over ferrous metal - Class to be determined by materialMIL-C-13924, CLASS 1, 3, 4
---K3BChromium plate, NI .0003 thick, black chromiumMIL-C-14538, COLOR NO. 37038/FED-STD-595
---K3CChromium plate, NI .0003 thick, bright (clear) chromiumQQ-C-320, TYPE I, CLASS 1, BRIGHT
---K3GChromium plate, NI .0003 thick, bronze-gold chromiumQQ-C-320, TYPE I, CLASS 1, BRONZE
---N2GNickel plate .0002 thick with copper undercoatingQQ-N-290, CLASS 1 GRADE G
ZFBTZinc Flake Coating with Black Sealer
Delta Seal Black GZ Coating
Delta Protekt; KL100
Z2CTZinc Trivalent Clear .0002 thick. Trivalent Chromate Clear with SealerASTM-B-633, Type III, SC 1, Clear
Z2YTZinc Trivalent Clear .0002 thick. Trivalent Chromate Yellow Dye with SealerASTM-B-633, Type II, SC 1, Yellow
Z3CZinc electroplate .0003 thick, clear trivalent chromateASTM-B-633, TYPE III, SC 2, CLEAR
Z3CTZinc Trivalent Clear .0003 thick. Trivalent Chromate Clear with SealerASTM-B-633, Type III, SC 2, Clear
Z3YTZinc Trivalent Yellow .0003 thick, Trivalent Chromate Yellow Dye with Sealer

We recommend the Z3CT finish instead of the Z3YT finish. The Z3CT finish is much more cost effective and provides the same salt spray benefits as the Z3YT finish.
ASTM-B-633, Type II, SC 2, Yellow

6. Now determine the Panel, Gap, and Support thicknesses.

Now determine the thickness of material in which the stud is retained and to which the receptacle is attached. Then determine the total gap between the level of stud head contact with material and the level of receptacle contact, in the closed position, include any air gaps and any part of the stud retainer thickness not buried in material already measured. Refer to the examples on each receptacle page, which will guide you to the length selection table.

Panel Gap Support

Unit of Measure:
Note: All internal calculations are done in inches.
The units are converted on input and for display.

7. Click on the "Calculate" button to see the resulting part numbers.

Every effort has been made to verify the accuracy of the calculations in this program. However, your application may be unique and not allowed for in the software. The calculations should be verified with an authorized sales engineer before purchasing the parts for your specific application.

  Your Specifications DFCI®
Part Number
Panel / Gap / Support
Deflection (min / max / actual)

If you allow cookies, clicking on this "Request Quotation" button will bring up our quotation request form with these items filled out. Fill out the rest of the form including your contact information and required quantities and click "Submit Request". Your quotation request will be sent to our quotations department for a quick response.

If you encounter any difficulties with this software, please send me an email outlining the problem and I will address the difficulty. As the software sees more use, I will be posting a frequently asked questions page to address the most common issues. mailbox