CSL428AD

Imperial Structural Locking Crownserts

CSL Series / Locking Type / AD / Structural

Installed using the Crownserts Hand-Installation Tool:  CSTL428

CSL428AD CS Series is a locking imperial Crownserts® threaded insert for durable thread reinforcement. 4130 alloy steel for high mechanical strength; specified with 1/4-28 UNF internal thread and 5/16-24 UNF installation thread.

Crownserts can offer you the part CSL428AD with Certificate of Quality, Certificate of Conformity and Certificate of Origin on request.

CSL428AD - Imperial Structural Locking Crownserts
CSL428AD - Imperial Structural Locking Crownserts
CSL428AD - Imperial Structural Locking Crownserts
CSL428AD - Imperial Structural Locking Crownserts
 How to install a Crownsert?
CSL428AD - Imperial Structural Locking Crownserts
CSL428AD - Imperial Structural Locking Crownserts
CSL428AD - Imperial Structural Locking Crownserts

Thread & Dimensions

A internal thread (Class 3B) 1/4-28 UNF
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
CSL428AD schematic

Material & Finish

Material Alloy Steel 4130 per AMS 6370
Finish Cadmium Plated per AMS-QQ-P-416 Type 2, Class 3 & SFL per SAE AS5272
Temperature range Up to 450+°F
Heat treat RC 25-34
Magnetic YES

Tooling & Preparation

Hand-installation tool part number CSTL428
Step drill part number CSD0281
Tap through tool part number TTI0312
Blind tap tool part number TBI0312
Removal tool part number CSRT428
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Crownserts is offering part CSL428AD as factory new.