SRW258

Imperial Structural Heavy-Duty Standard Inserts

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

Installed using the Crownserts Hand-Installation Tool:  CST428

SRW258 repairs/reinforces 1/4-28 UNF imperial threads in Al/Mg or other non-ferrous materials; 17-4PH stainless. Tap hole .302 N; install with CST428. This is an old Anemo part. Please use CSH428.

We can offer you the part SRW258 with Certificate of Quality, Certificate of Conformity and Certificate of Origin on request.

SRW258 - Imperial Structural Heavy-Duty Standard Inserts
SRW258 - Imperial Structural Heavy-Duty Standard Inserts
SRW258 - Imperial Structural Heavy-Duty Standard Inserts
SRW258 - Imperial Structural Heavy-Duty Standard Inserts
 How to install a Crownsert?
SRW258 - Imperial Structural Heavy-Duty Standard Inserts
SRW258 - Imperial Structural Heavy-Duty Standard Inserts
SRW258 - Imperial Structural Heavy-Duty Standard Inserts

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
SRW258 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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