CS428A286

Imperial Structural Standard Crownserts

CS Series / Standard Type / A286 / Structural

Installed using the Crownserts Hand-Installation Tool:  CST428

CS428A286 is an imperial structural standard crownsert in A286 high-temperature alloy, designed to strengthen 1/4-28 UNF threads in lightweight parent materials. It uses 5/16-24 UNF external threads and CST428 installation tooling.

Crownserts can offer you the part CS428A286 with Certificate of Quality, Certificate of Conformity and Certificate of Origin on request.

CS428A286 - Imperial Structural Standard Crownserts
CS428A286 - Imperial Structural Standard Crownserts
CS428A286 - Imperial Structural Standard Crownserts
CS428A286 - Imperial Structural Standard Crownserts
 How to install a Crownsert?
CS428A286 - Imperial Structural Standard Crownserts
CS428A286 - Imperial Structural Standard Crownserts
CS428A286 - Imperial Structural Standard 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
F .240
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
CS428A286 schematic

Material & Finish

Material A286 per AMS5731 or AMS 5734
Finish PASSIVATED per AMS 2700 & SFL coated per SAE AS5272, Type 1
Temperature range -400°/+650°F
Heat treat RC 32-40
Magnetic NO

Tooling & Preparation

Hand-installation tool part number CST428
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 CS428A286 as factory new.