CSSL428SP

Imperial Short Crownserts

CSS Series / Locking Type / Inconel 718 SP / Short

Installed using the Crownserts Hand-Installation Tool:  CSTL428

CSSL428SP is an imperial short crownsert in Inconel 718 with silver-plated internal surfaces, designed to strengthen 1/4-28 UNJF-3B threads in lightweight parent materials. It uses 5/16-24 UNJF-3A external threads and CSTL428 installation tooling.

Crownserts can offer you the part CSSL428SP with Certificate of Quality, Certificate of Conformity and Certificate of Origin on request.

CSSL428SP - Imperial Short Crownserts
CSSL428SP - Imperial Short Crownserts
CSSL428SP - Imperial Short Crownserts
CSSL428SP - Imperial Short Crownserts
 How to install a Crownsert?
CSSL428SP - Imperial Short Crownserts
CSSL428SP - Imperial Short Crownserts
CSSL428SP - Imperial Short Crownserts

Thread & Dimensions

Thread Ø A 1/4-28 UNJF-3B
Thread Ø B 5/16-24 UNJF-3A
Minor diameter max .2785
Ø C (±.003) .256
D (±.010) .380
E ref .24
F (±.005) .090
G (±.005) .075
H ref .210
J 24
Through-hole preparation Min. full THD depth 0,602; Min. full depth .415
Blind-hole preparation Min. full THD depth .519; Min. full depth .415
CSSL428SP schematic

Material & Finish

Material Inconel 718 per AMS 5662
Finish Internal surfaces: Silver plated per AMS 2411 (0.0002 in min. thickness); External surfaces: Passivated per AMS 2700
Material note Only available as locking SP version.

Tooling & Preparation

Hand-installation tool part number CSTL428
Step drill part number CSD0281
Tap through tool part number TTI0311 / TTI0312
Blind tap tool part number TBI0311 / TBI0312
Removal tool part number CSRT428
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Crownserts is offering part CSSL428SP as factory new.