CSH428

Imperial Structural Heavy-Duty Standard Crownserts

CSH Series / Standard Type / 17-4PH / Structural Heavy-Duty

Installed using the Crownserts Hand-Installation Tool:  CST428

CSH428 reinforces or repairs 1/4-28 UNF imperial threads in aluminium, magnesium or other non-ferrous materials. 17-4PH stainless steel, with .302 N tap-hole guidance and CST428 hand installation tooling.

Crownserts can offer you the part CSH428 with Certificate of Quality, Certificate of Conformity and Certificate of Origin on request.

CSH428 - Imperial Structural Heavy-Duty Standard Crownserts
CSH428 - Imperial Structural Heavy-Duty Standard Crownserts
CSH428 - Imperial Structural Heavy-Duty Standard Crownserts
CSH428 - Imperial Structural Heavy-Duty Standard Crownserts
 How to install a Crownsert?
CSH428 - Imperial Structural Heavy-Duty Standard Crownserts
CSH428 - Imperial Structural Heavy-Duty Standard Crownserts
CSH428 - Imperial Structural Heavy-Duty Standard Crownserts

Thread & Dimensions

A internal thread (Class 3B) 1/4-28 UNF
B external thread (Class 3A) 11/32-24 NS
Ø max minor special .2976
Ø C (+.008/-.002) .264
D (+.015/-.000) .095
F ref .240
G (±.010) .380
Through-hole preparation Min. full THD depth .602; Min. full depth 0,415
Blind-hole preparation Min. full THD depth .519; Min. full depth 0,415
CSH428 schematic

Material & Finish

Material 17-4PH, Cond H1025 per AMS 5643
Finish PASSIVATED per AMS 2700 & SFL coated per SAE AS5272
Temperature range -110°/+650°F
Heat treat RC 35-42
Magnetic YES
Material note Standard material code; no suffix added to the part number.

Tooling & Preparation

Hand-installation tool part number CST428
Step drill part number CSD0302
Tap through tool part number TTI0343
Blind tap tool part number TBI0343
Removal tool part number CSHRT428
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Crownserts is offering part CSH428 as factory new.