CS918AD

Imperial Large Crownserts

CS Series / Standard Type / AD / Large

Installed using the Crownserts Hand-Installation Tool:  CTSL918

CS918AD is an imperial large crownsert in 4130 alloy steel for high mechanical strength, designed to strengthen 9/16-18 UNF threads in lightweight parent materials. It uses 11/16-12 UN external threads and CTSL918 installation tooling.

Crownserts can offer you the part CS918AD with Certificate of Quality, Certificate of Conformity and Certificate of Origin on request.

CS918AD - Imperial Large Crownserts
CS918AD - Imperial Large Crownserts
CS918AD - Imperial Large Crownserts
CS918AD - Imperial Large Crownserts
 How to install a Crownsert?
CS918AD - Imperial Large Crownserts
CS918AD - Imperial Large Crownserts
CS918AD - Imperial Large Crownserts

Thread & Dimensions

A internal thread (Class 3B) 9/16-18 UNF
B external thread (Class 3A) 11/16-12 UN
Ø max minor special .6130
Ø C (+.008/-.002) .571
D (+.015/-.000) .145
F .550
G (±.010) .840
J (±1) 42
Through-hole preparation Min. full THD depth 1.248; Min. full depth .873
Blind-hole preparation Min. full THD depth 1.081; Min. full depth .873
CS918AD 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

Step drill part number CSD0625
Tap through tool part number TTI0687
Blind tap tool part number TBI0687
Removal tool part number CSRT918
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Crownserts is offering part CS918AD as factory new.