SRQB258L0074

Imperial Long Inserts

Locking Type / Inconel 718 SP / Long

Installed using the Crownserts Hand-Installation Tool:  CSTL428

SRQB258L0074 repairs/reinforces 1/4-28 UNJF-3B imperial threads in Al/Mg or other non-ferrous materials; Inconel 718, internally silver-plated. Tap hole .280-.285; install with CSTL428. This is an old Anemo part. Please use CSXL428SP.

We can offer you the part SRQB258L0074 with Certificate of Quality, Certificate of Conformity and Certificate of Origin on request.

SRQB258L0074 - Imperial Long Inserts
SRQB258L0074 - Imperial Long Inserts
SRQB258L0074 - Imperial Long Inserts
SRQB258L0074 - Imperial Long Inserts
 How to install a Crownsert?
SRQB258L0074 - Imperial Long Inserts
SRQB258L0074 - Imperial Long Inserts
SRQB258L0074 - Imperial Long Inserts

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) .595
E ref .35
F (±.005) .090
G (±.005) .075
H ref .210
J 24
Through-hole preparation Min. full THD depth 0,817; Min. full depth .630
Blind-hole preparation Min. full THD depth 0,734; Min. full depth .630
SRQB258L0074 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.
Rolls Royce Applicable YES

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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