SR-250-0025

Imperial Structural Standard Inserts

Standard Type / A286 / Structural

Installed using the Crownserts Hand-Installation Tool:  CST420

SR-250-0025 is an imperial structural standard insert in A286 alloy for 1/4-20 UNC threads in light alloys; 5/16-24 UNF external; install with CST420. This is an old Anemo part. Please use CS420A286.

We can offer you the part SR-250-0025 with Certificate of Quality, Certificate of Conformity and Certificate of Origin on request.

SR-250-0025 - Imperial Structural Standard Inserts
SR-250-0025 - Imperial Structural Standard Inserts
SR-250-0025 - Imperial Structural Standard Inserts
SR-250-0025 - Imperial Structural Standard Inserts
 How to install a Crownsert?
SR-250-0025 - Imperial Structural Standard Inserts
SR-250-0025 - Imperial Structural Standard Inserts
SR-250-0025 - Imperial Structural Standard Inserts

Thread & Dimensions

A internal thread (Class 3B) 1/4-20 UNC
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
SR-250-0025 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 CST420
Step drill part number CSD0281
Tap through tool part number TTI0312
Blind tap tool part number TBI0312
Removal tool part number CSRT420
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