CS518D

Imperial Structural Standard Crownserts

CS Series / Standard Type / D / Structural

Installed using the Crownserts Hand-Installation Tool:  CST518

CS518D is an imperial structural standard crownsert in 4130 alloy steel for high mechanical strength, designed to strengthen 5/16-18 UNC threads in lightweight parent materials. It uses 3/8-24 UNF external threads and CST518 installation tooling.

Crownserts can offer you the part CS518D with Certificate of Quality, Certificate of Conformity and Certificate of Origin on request.

CS518D - Imperial Structural Standard Crownserts
CS518D - Imperial Structural Standard Crownserts
CS518D - Imperial Structural Standard Crownserts
CS518D - Imperial Structural Standard Crownserts
 How to install a Crownsert?
CS518D - Imperial Structural Standard Crownserts
CS518D - Imperial Structural Standard Crownserts
CS518D - Imperial Structural Standard Crownserts

Thread & Dimensions

A internal thread (Class 3B) 5/16-18 UNC
B external thread (Class 3A) 3/8-24 UNF
Ø max minor special .3405
Ø C (+.008/-.002) .314
D (+.015/-.000) .110
F .310
G (±.010) .470
J (±1) 29
Through-hole preparation Min. full THD depth .693; Min. full depth .505
Blind-hole preparation Min. full THD depth .693; Min. full depth .505
CS518D 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 CST518
Step drill part number CSD0343
Tap through tool part number TTI0375
Blind tap tool part number TBI0375
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Crownserts is offering part CS518D as factory new.