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Test Items

Name Of Produces

No.

Test Item

Remarks 

BoltsScrewsStuds

1

Dimension

Image Measuring Instrument can detect Pitch, tooth height, thread Angle etc.
2

Go/No Go gage


3

Tensile Strength/Proof  Load Test


4

Wedge Tensile Strength


5

Rockwell Hardness


6

Vickers Hardness

The loading force is less than 490N

7

Decarburization


8

The Tensile Test Machined specimen

Tensile  Strength、Stress at0.2%non-proportion elongation Rp0.2/Lower yield strength、 Elongation、Reduction of Area;

9

Impact TestLow temperature

V-notch and U-notch ,Normal temperature to - 101℃

10

Hydrogen Embrittlement Test


Nuts

11

Proof  Load Test


12

HardnessRockwell、Vickers


13

Tolerance of  total run-out

M6-M361/4"-1 1/2"

BoltsNuts

14

Re-temper Test 


Bolts、Screws、Studs、Nuts


15

Coating Thickness

Hot-dip galvanized

Galvanized,Nickel

16

Salt Spring Test 

(NSS Test)

17

Microstructure 

Raw materials, Semi-finished products, Finished products

18

Grain Size 

Metal Products

19

Chemical composition of Steel and Alloy Structure Steels

Cast、High cast、Cr-Cr/Ni-Ni steel、Tool steel、Mangan steel  

Chemical compostion of Stainless Steel