SAE AS 3506B:2014 pdf free download – (R) Insert – Screw Thread, Thin Wall, Self-Locking, UNS N0771 8, Silver Plated, Class: 1 85 ksi/1 025 °F, Procurement Specification
1 .1 Scope
This SAE Aerospace Standard (AS) establishes the requirements for AS3504 and AS3505 thin wall self-locking inserts made from a corrosion and heat resistant, age hardenable nickel base alloy of the type identified under the Unified Numbering System as UNS N0771 8.
1 .1 .1 Classification
Tensile strength at room temperature 1 85 ksi minimum. Maximum test temperature of parts is 1 025 °F.
1 .1 .2 The method of locking the insert into parent material to resist rotation to be by means of swaging the insert knurled collar into a hole prepared in per AS3508.
1 .2 Application
Primarily for use in aircraft engines application up to approximately 1 025 °F where an insert with a self-locking feature is required at elevated temperature, having excellent tensile strength and resistance to relaxation.
2. REFERENCES
2.1 Applicable Documents
The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3.4.2 Solution and Precipitation Heat Treatment
The semi-finished blanks shall be solution treated at a temperature of 1 775 °F ± 75 °F, holding at the selected temperature within ±25 °F for at least 1 hour, then air cooling. The solution treated blanks shall be precipitation heat treated at a temperature of 1 325 °F ± 1 0 °F, holding at heat for 8 hours, then furnace cooling down to 1 1 50 °F ± 1 0 °F with a rate of 1 00 °F ± 1 0 °F per hour, holding at the 1 1 50 °F for 8 hours followed by air cooling. Instead of the 1 00 °F ± 1 0 °F per hour cooling rate to 1 1 50 °F, inserts may be furnace cooled at any rate provided the time at 1 1 50 °F is adjusted to give a total precipitation time of 1 8 hours ± 30 minutes.
3.4.3 Threads Forming
Threads may be produced either by machining, grinding, or fully formed by single rolling process. Threads in locking area may be displaced in any manner which enables the insert to meet the requirements of this document.
3.4.4 Surface Plating
All inserts shall be silver plated per AMS241 1 , 0.0002 thickness minimum, or as specified on AS3504 and AS3505.
3.4.5 Surface Discontinuities
Prior to surface plating, insert shall be subjected to penetrant inspection per ASTM E1 41 7/E1 41 7M, Type I, Sensitivity Level 2. Insert showing discontinuities equal to or exceeding the limitations of Table 1 shall be rejected.