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When selecting finishes, select the RoHS compliant finishes. They are better for the environment and less expensive!

 

ST-1200 Line - Size 5 Studs

Standard Parts
Component Material Finish1
Stud Hardened Steel Zinc Trivalent Clear .0003 thick. Trivalent Chromate Clear with Sealer (RoHS Compliant)
Specification(s): ASTM-B-633, Type III, SC 2, Clear
Suffix: -Z3CT
D-ring hard music wire Zinc Trivalent Clear .0003 thick. Trivalent Chromate Clear with Sealer (RoHS Compliant)
Specification(s): ASTM-B-633, Type III, SC 2, Clear
Suffix: -Z3CT
Wing carbon steel Zinc Trivalent Clear .0003 thick. Trivalent Chromate Clear with Sealer (RoHS Compliant)
Specification(s): ASTM-B-633, Type III, SC 2, Clear
Suffix: -Z3CT
Optional Stainless Steel
Stud and Wing 303 Stainless Steel Natural
D-Ring 400 series Stainless Steel Natural
1 Optional Finishes: Change the plating suffix on the part number from "Z3CT" to the desired plating. See finishes pages.

Stud Dimensions

SLOTTED: 121J-5*-Z3CTPHILLIPS: 121J-P5*-Z3CTHEX: 121J-H5*-Z3CT
Stud Picture Stud Picture Stud Picture

Click here for the Engineering Drawing
121J-5 Revision B

Click here for the Engineering Drawing
121J-P5 Revision A

Click here for the Engineering Drawing
121J-H5 Revision B

Stud Dimension Drawing Stud Dimension Drawing Stud Dimension Drawing
Stud Picture
Slotted
Part Number
Stud Picture
Phillips
Part Number
Stud Picture
Hex Recess
Part Number
Undercut
Dimension
(U)
Grip
Length
(G)
Weight
Steel Steel Steel inch mm inch mm lb g
121J-530-Z3CT121J-P530-Z3CT121J-H530-Z3CT.1253.18.3007.62  
121J-540-Z3CT121J-P540-Z3CT121J-H540-Z3CT.1904.83.40010.16.00853.86
121J-550-Z3CT121J-P550-Z3CT121J-H550-Z3CT.2506.35.50012.70.00984.45
121J-560-Z3CT121J-P560-Z3CT121J-H560-Z3CT.3007.62.60015.24.01115.03
121J-570-Z3CT121J-P570-Z3CT121J-H570-Z3CT.40010.16.70017.78.01245.62
121J-580-Z3CT121J-P580-Z3CT121J-H580-Z3CT.50012.70.80020.32.01376.21
121J-590-Z3CT121J-P590-Z3CT121J-H590-Z3CT.60015.24.90022.86.01506.80
121J-5100-Z3CT121J-H5100-Z3CT121J-H5100-Z3CT.70017.781.00025.40.01637.39
121J-5110-Z3CT121J-H5110-Z3CT121J-H5110-Z3CT.70017.781.10027.94  
121J-5120-Z3CT121J-H5120-Z3CT121J-H5120-Z3CT.70017.781.20030.48  
WING: 121J-W5*-Z3CT
Stud Picture

Click here for the Engineering Drawing
121J-W5 Revision B

Stud Dimension Drawing
Stud Picture
Wing
Part Number
Undercut
Dimension
(U)
Grip
Length
(G)
Steel inch mm inch mm
121J-W530-Z3CT.1253.18.3007.62
121J-W540-Z3CT.1904.83.40010.16
121J-W550-Z3CT.2506.35.50012.70
121J-W560-Z3CT.3007.62.60015.24
121J-W570-Z3CT.40010.16.70017.78
121J-W580-Z3CT.50012.70.80020.32
121J-W590-Z3CT.60015.24.90022.86
121J-W5100-Z3CT.70017.781.00025.40
121J-W5110-Z3CT.70017.781.10027.94
121J-W5120-Z3CT.70017.781.20030.48
FLUSH: 126J-5*-Z3CT
Stud Picture

Click here for the Engineering Drawing
126J-5 Revision A

Stud Dimension Drawing
Stud Picture
Flush
Part Number
Undercut
Dimension
(U)
Grip
Length
(G)
Weight
Steel inch mm inch mm lb g
126J-540-Z3CT.2255.72.40010.16.00833.76
126J-550-Z3CT.2506.35.50012.70.00934.22
126J-560-Z3CT.3007.62.60015.24.01034.67
126J-570-Z3CT.40010.16.70017.78.01155.22
126J-580-Z3CT.50012.70.80020.32.01235.58
126J-590-Z3CT.60015.24.90022.86.01376.21
126J-5100-Z3CT.70017.781.00025.40.01536.94
126J-5110-Z3CT.70017.781.10027.94  
126J-5120-Z3CT.70017.781.20030.48  
KNURLED: 1211-5*-Z3CTTAMPER RESIST: 1230-5*-Z3CTRING: 122J-R5*-Z3CT
Stud Picture Stud Picture Stud Picture

Click here for the Engineering Drawing
1211-5 Revision A

Click here for the Engineering Drawing
122J-R5 Revision C

Stud Dimension Drawing Stud Dimension Drawing Stud Dimension Drawing
Stud Picture
Knurled
Part Number
Stud Picture
Tamper Resist
Part Number
Stud Picture
Ring
Part Number
Undercut
Dimension
(U)
Grip
Length
(G)
Steel Steel Steel inch mm inch mm
1211-530-Z3CT1230-530-Z3CT122J-R530-Z3CT.1253.18.3007.62
1211-540-Z3CT1230-540-Z3CT122J-R540-Z3CT.1904.83.40010.16
1211-550-Z3CT1230-550-Z3CT122J-R550-Z3CT.2506.35.50012.70
1211-560-Z3CT1230-560-Z3CT122J-R560-Z3CT.3007.62.60015.24
1211-570-Z3CT1230-570-Z3CT122J-R570-Z3CT.40010.16.70017.78
1211-580-Z3CT1230-580-Z3CT122J-R580-Z3CT.50012.70.80020.32
1211-590-Z3CT1230-590-Z3CT122J-R590-Z3CT.60015.24.90022.86
1211-5100-Z3CT1230-5100-Z3CT122J-R5100-Z3CT.70017.781.00025.40
1211-5110-Z3CT1230-5110-Z3CT122J-R5110-Z3CT.70017.781.10027.94
1211-5120-Z3CT1230-5120-Z3CT122J-R5120-Z3CT.70017.781.20030.48

* is the "Stud Grip" from the table. For example, 121J-540-Z3CT is an oval head stud with a "Stud Grip" of 40.

The undercut is a part of the stud which is smaller in diameter than the stud shank. The undercut is located directly under the head. This decreased diameter is where the retainer fits to prevent the stud from coming out of the mounting hole.

Note: For all raised head styles, the "G" (Grip) and "U" (Undercut) dimensions are measured to the underside of the head. For the flush head style, the "G" (Grip) and "U" (Undercut) dimensions are measured to the top of the head.


Self Ejecting Assembly Picture
Type SE

ST-1200 Line studs 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.

Self Ejecting Assembly Dimension Drawing

Stud ejection = Dimension "U" (length of undercut) - total height of the cup (.090" [2.29 mm]), panel, and retainer. See stud selection tables for Dimension "U".

DFCI does not recommend using the SE option on any studs where Dimension "U" (length of undercut) is less than .300" (7.62mm). That is, on any stud less than -60 length.

Type SE ejecting stud assemblies are compatible with all receptacles in their size.

Sizing: When calculating the pileup for sizing an SE configuration, .090" (2.29 mm) must be added for the SE Cup.

Callout: Insert "SE" in front of the finish suffix. For example: Part Number 121J-560-SE-Z3CT.

For additional Self-Ejecting options, click this link.

Note: When our existing supply of Cadmium plated parts is exhausted, DFCI Solutions, Inc will no longer offer Cadmium plating as an option.

In place of the Cadmium plating, we recommend:

Clear: Zinc Trivalent Clear .0003 thick. Trivalent Chromate Clear with Sealer (RoHS Compliant)
Specification(s): ASTM-B-633, Type III, SC 2, Clear
Suffix: -Z3CT

Black: Zinc Trivalent Black .0003 thick. Trivalent Chromate Black Dye with Sealer (RoHS Compliant)
Specification(s): ASTM-B-633, Type II, SC 2, Black
Suffix: -Z3BT

Yellow: Zinc 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. (RoHS Compliant)
Specification(s): ASTM-B-633, Type II, SC 2, Yellow
Suffix: -Z3YT

The colored finishes offer no advantage over the clear other than the color, and they are more expensive.