CS820D

Imperial Structural Standard Crownserts

CS Series / Standard Type / D / Structural

Installed using the Crownserts Hand-Installation Tool:  CST820

CS820D is an imperial structural standard crownsert in 4130 alloy steel for high mechanical strength, designed to strengthen 1/2-20 UNF threads in lightweight parent materials. It uses 9/16-24 UNEF external threads and CST820 installation tooling.

Crownserts can offer you the part CS820D with Certificate of Quality, Certificate of Conformity and Certificate of Origin on request.

CS820D - Imperial Structural Standard Crownserts
CS820D - Imperial Structural Standard Crownserts
CS820D - Imperial Structural Standard Crownserts
CS820D - Imperial Structural Standard Crownserts
 How to install a Crownsert?
CS820D - Imperial Structural Standard Crownserts
CS820D - Imperial Structural Standard Crownserts
CS820D - Imperial Structural Standard Crownserts

Thread & Dimensions

A internal thread (Class 3B) 1/2-20 UNF
B external thread (Class 3A) 9/16-24 UNEF
Ø max minor special .5290
Ø C (+.008/-.002) .505
D (+.015/-.000) .135
F .490
G (±.010) .750
J (±1) 44
Through-hole preparation Min. full THD depth .973; Min. full depth .785
Blind-hole preparation Min. full THD depth .889; Min. full depth .785
CS820D 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 CST820
Step drill part number CSD0531
Tap through tool part number TTI0562
Blind tap tool part number TBI0562
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Crownserts is offering part CS820D as factory new.