Go Green and Save Green!

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

ST-1200 Line - Size 4
Square Hole Receptacle

The 1219-QC4 receptacle features compact size and fast installation, while providing all the advantages of spiral-cam quarter-turn fastening. Easily snapped into the underside of a square hole, it is self-retaining and it remains rattle-free whether the fastener is opened or locked.

In many cases, 1219-QC4 can replace square hole caged nuts on existing equipment.

This is a highly durable fastener, with excellent strength for its small size.

Technical Information

Working tension (minimum): 11 lb

Safe load without distortion: 30 lb maximum

Minimum distance between holes (edge to edge): .50 inches (12.70 mm)

Gap between panel and support face (caused by receptacle clip width, see drawing):.02 inches (.51 mm)

Recommended spring deflection: .020 to .045 in. (.51 to 1.14 mm)

Material: All parts are carbon steel, spring temper.

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

Stud Length Calculation
Panel Preparation Drawing Stud Installation Drawing

Add panel thickness, plus receptacle "H" dimension (.452 in. (11.48 mm)). Select a stud with an "Grip Length" nearest to, but less than, that total. If the stud "Grip Length" dimension is not at least .025 in. (.64 mm) less than that total, add a 127P-4 plastic washer under the head to provide sufficient spring deflection.

Square Hole Receptacle Dimension Drawing Top View Square Hole Receptacle Side View Dimension Drawing

Click here for the Engineering Drawing
1219-QC Revision E

Panel Thickness Stud Grip Grip Length 127P-4 Washer
inch mm inch mm
.019-.043 .48-1.09 45 .450 11.43 None
.044-.068 1.12-1.73 50 .500 12.70 One
.069-.093 1.75-2.36 50 .500 12.70 None
.094-.118 2.39-3.00 55 .550 13.97 One
.119-.143 3.02-3.63 55 .550 13.97 None
.144-.168 3.66-4.27 60 .600 15.24 One
.169-.193 4.29-4.90 60 .600 15.24 None
.194-.218 4.93-5.54 65 .650 16.51 One
.219-.243 5.56-6.17 65 .650 16.51 None
.244-.268 6.20-6.81 70 .700 17.78 One
.269-.293 6.83-7.44 70 .700 17.78 None
.294-.318 7.47-8.08 75 .750 19.05 One
.319-.343 8.10-8.71 75 .750 19.05 None
.344-.368 8.74-9.35 80 .800 20.32 One
.369-.393 937-9.98 80 .800 20.32 None


  1. To provide correct locking tension, some studs are fitted with a .025 in. (.64 mm) thick plastic washer under the head. Part number 127P-4, which is offered for this use, differs from part number 127P-4B.
  2. The 1219-R4-SS Snap Ring is the only retainer which can fit inside the 1219-QC4 allowing flush contact between the panel and receptacle clips.

Receptacle Hole
Square Hole Receptacle Installation Support Preparation Dimension Drawing
.031-.056 1219-QC416-Z3CT
.058-.078 1219-QC420-Z3CT
.079-.098 1219-QC425-Z3CT
.102-.125 1219-QC430-Z3CT

Square Hole Receptacle Installation Procedure Drawings

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.