DWG_0356_Locking Pellet Installation Torque Testing Procedure for Non-DoD Entities.pdf

NO. TITLE IDENT

REFERENCES

DISTRIBUTION STATEMENT A

APPROVED FOR PUBLIC RELEASE

DISTRIBUTION IS UNLIMITED

UNITS AND TOLERANCES DEPARTMENT OF THE NAVY

NORFOLK NAVAL SHIPYARD DETACHMENT

NAVAL FOUNDRY AND PROPELLER CENTER

PHILADELPHIA, PA

Locking Pellet Installation & Torque Testing Procedure for Non-DoD

Entities

PREPARED

Brett Pierce

DATE

11/4/19 SIZE CODE IDENT: NFPC DRAWING NO. REV

CHECKED

Chris Clark

11/4/19 A CODE

1420 0356 - PROJECT ENG

Chris Clark

11/4/19

APPROVED

Nate Bird

See Digital

Signature

SCALE: None SHEET 1 OF 2

N/A

REVISIONS

REV ZONE DESCRIPTION DATE APPROVED

- N/A INITIAL RELEASE See Digital Signature

Purpose:

This drawing provides instructions for installation of self-locking pellet and torque testing of threaded fasteners by Non-DoD Entities. Instructions per this drawing are in accordance with requirements of UIPI 5050-904B

Pellet Installation & Torque Testing Procedure:

1. The vendor shall manufacture a locking pellet in accordance with the applicable drawing or contract.

Pellet must be sized to create a light interference fit with the pellet hole.

2. The vendor shall install a pellet in each fastener.

3. The vendor shall use a sharp knife to cleanly cut the locking pellet approximately flush with the fastener thread major diameter.

4. The vendor shall measure the fastener diameter at the pellet. This diameter must be of the size and within the tolerance given in the applicable drawing or contract. Quality Assurance Inspectors from the Naval Foundry and Propeller Center must be on-site at the vendor’s location to verify the results.

5. The vendor shall perform a torque test on all pelletized fasteners as follows:

a) Insert the fastener into an appropriate nut or test fixture until the pellet is fully engaged. The threads of the nut/test fixture shall be of the same nominal size and thread class as the fastener being tested.

b) Using a calibrated torque wrench, measure the breakaway torque required to remove the fastener.

The required minimum breakaway torque value will be given in in the applicable drawing or contract.

Quality Assurance Inspectors from the Naval Foundry and Propeller Center must be on-site at the vendor’s location to witness the tests.

Note: If a test proves unsatisfactory for these requirements, remove the pellet, inspect the part for damage, install a new pellet in accordance with this procedure and retest the fastener. This retest may be performed once before disqualifying the part.

6. Inspect the fastener threads for any damage. Noticeable distortion or scratches deep enough to reduce the efficiency of the threads, or any elongation of the pellet hole, shall be considered a failure of the self– locking element.

SIZE CODE IDENT CODE 1420 DRAWING NO. REV

A

CODE 1420

0356 - SCALE: None SHEET 2 OF 2