CSL420SP

Imperial Structural Locking Crownserts

CSL Series / Locking Type / SP / Structural

Installed using the Crownserts Hand-Installation Tool:  CSTL420

CSL420SP is an imperial structural locking crownsert in silver-plated 17-4PH stainless steel, designed to strengthen 1/4-20 UNC threads in lightweight parent materials. It uses 5/16-24 UNF external threads and CSTL420 installation tooling.

Crownserts can offer you the part CSL420SP with Certificate of Quality, Certificate of Conformity and Certificate of Origin on request.

CSL420SP - Imperial Structural Locking Crownserts
CSL420SP - Imperial Structural Locking Crownserts
CSL420SP - Imperial Structural Locking Crownserts
CSL420SP - Imperial Structural Locking Crownserts
 How to install a Crownsert?
CSL420SP - Imperial Structural Locking Crownserts
CSL420SP - Imperial Structural Locking Crownserts
CSL420SP - Imperial Structural Locking Crownserts

Thread & Dimensions

A internal thread (Class 3B) 1/4-20 UNC
B external thread (Class 3A) 5/16-24 UNF
Ø max minor special .2785
Ø C (+.008/-.002) .252
D (+.015/-.000) .095
E .210
G (±.010) .380
J (±1) 24
Through-hole preparation Min. full THD depth .519; Min. full depth .415
Blind-hole preparation Min. full THD depth .519; Min. full depth .415
CSL420SP schematic

Material & Finish

Material 17-4PH, Cond H1025 per AMS 5643
Finish PASSIVATED per AMS 2700 & Silver Plated per AMS 2411 (.0002 min. thickness)
Temperature range -110°/+900°F
Heat treat RC 35-42
Magnetic YES

Tooling & Preparation

Hand-installation tool part number CSTL420
Step drill part number CSD0281
Tap through tool part number TTI0312
Blind tap tool part number TBI0312
Removal tool part number CSRT420
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Crownserts is offering part CSL420SP as factory new.