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1 FASTENER TIPS: TESTING, TEST REPORTS, SUPPLIER OVERSIGHT Approved for Public Release.

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Presentation on theme: "1 FASTENER TIPS: TESTING, TEST REPORTS, SUPPLIER OVERSIGHT Approved for Public Release."— Presentation transcript:

1 1 FASTENER TIPS: TESTING, TEST REPORTS, SUPPLIER OVERSIGHT Approved for Public Release

2 Fastener Testing2 Topics Past Problems Quality Control Test Methods Test Variables Test Report Content Approved for Public Release

3 Fastener Testing3 Past Problems –Lack of hydrogen embrittlement relief –Wrong wedge angles –Wrong gage lengths –Sampling –Process control of piercing diameter –Concentricity of head and/or socket to shank Approved for Public Release

4 Fastener Testing4 Piercing Diameter Minor Diameter Out of Tolerance Minor Diameter Within Tolerance Approved for Public Release

5 Fastener Testing5 Concentricity Socket is not centered in the head of the screw Head and shank are not concentric Socket is not centered in the head of the screw Approved for Public Release

6 Fastener Testing6 Topics Past Problems Quality Control Test Methods Test Variables Test Report Content Approved for Public Release

7 Fastener Testing7 Quality Control Mil-I Inspection System Requirement Requires: Clear and concise procedures. (Para ) Use of calibrated equipment. (Para. 3.3) Providing and maintaining adequate records (i.e. Objective Quality Evidence (OQE)). (Para ) Other quality standards may apply,however the rules are basically the same (e.g. MIL-Q-9858, ISO 9001). Approved for Public Release

8 Fastener Testing8 Topics Past Problems Quality Control Test Methods Test Variables Test Report Content Approved for Public Release

9 Fastener Testing9 Test Methods ASTM F606 Standard Testing Methods Are Typically Invoked Unless Otherwise Specified Tensile / Yield / Elongation (Mach. specimens) Axial Tension (Full Size fasteners) Proof load (Full Size fasteners) Wedge tension (Full Size fasteners) Hardness Approved for Public Release

10 Fastener Testing10 Test Methods Flat surface Hardness testing performed on a convex cylindrical surface Correction factors of ASTM E18 need to be applied Cylindrical surface Approved for Public Release

11 Fastener Testing11 Test Methods Determination Of Proper Wedge Angle For Wedge Testing ASTM F606 (Unless otherwise specified) ASTM A574 (Socket Head Cap Screws) MIL-S-1222H3 (Titanium, SC ) Approved for Public Release

12 Fastener Testing12 Test Methods Gage Lengths Are Different For Ferrous And Non- ferrous Fasteners Approved for Public Release

13 Fastener Testing13 Test Methods Plated Steel Fasteners May Require Additional Processing And Testing The plating process can cause Hydrogen Embrittlement of steel fasteners. Post plate baking is normally required to drive off hydrogen introduced into the base material Hydrogen Embrittlement can cause delayed cracking. Stress Durability Testing may be required to determine the effectiveness of the post plate baking process. Approved for Public Release

14 Fastener Testing14 Test Methods Determining Sample Size And Test Requirements The manufactured lot size is needed to determine the correct number of samples. Type of specimens. –Machined specimens –Full size fasteners Approved for Public Release

15 Fastener Testing15 Test Methods Determining sample size and test requirements FF-S-86 Approved for Public Release

16 Fastener Testing16 Determining sample size and test requirements FF-S-86 Test Methods Approved for Public Release

17 Fastener Testing17 Determining sample size and test requirements Mil-S-1222 Test Methods Approved for Public Release

18 Fastener Testing18 Determining sample size and test requirements Mil-S-1222 Test Methods Approved for Public Release

19 Fastener Testing19 Topics Past Problems Quality Control Test Methods Test Variables Test Report Content Approved for Public Release

20 Fastener Testing20 Test Variables Variables that can affect test results Fixturing, Alignment. Speed of applied load. Test Specimen preparation (Surface finish). Tool marks act as stress risers. Approved for Public Release

21 Fastener Testing21 Topics Past Problems Quality Control Test Methods Test Variables Test Report Content Approved for Public Release

22 Fastener Testing22 Test Reports Name of Testing Organization Date of the test Purchase Order number and Item number Manufactured lot size Material Spec. Alloy, Type, Class, Grade, Condition Type of specimen tested (machined vs. full size) Traceability to hardware (Lot Code) Acceptance criteria. Statement of acceptance or rejection Units should be the same as those contained in the acceptance spec. (lbs vs. psi) Signature of test organization representative and date. Approved for Public Release

23 Fastener Testing23 Test Reports C of C Approved for Public Release

24 Fastener Testing24 Test Reports Chemicals Approved for Public Release

25 Fastener Testing25 Test Reports Mechanicals Approved for Public Release

26 Fastener Testing26 Test Reports Mechanicals Approved for Public Release

27 Fastener Testing27 Test Reports Mechanicals Approved for Public Release

28 Fastener Testing28 Test Reports NDT Approved for Public Release

29 Fastener Testing29 Test Reports NDT Approved for Public Release

30 Fastener Testing30 Summary Past Problems Quality Control Test Methods Test Variables Test Report Content Approved for Public Release


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