JOHN CHEN SCREW AND NIPPON STEEL JOINTLY DEVELOPED A SPECIAL METERIAL YUS550(NCCS550) TOGETHER, ALSO KNOWN AS "JOHN TEK". YUS550 TOOK US MORE THAN 17 YEARS TO SUCCESSFULLY DEVELOP THIS HIGH-PERFORMANCE, HIGH -SAFETY, AND IT CAN COST DOWN 90% OF THE PRICE.
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TEST 01SALT SPRAY TEST REPORT6,000-15,000 HRS MIN
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TEST 02KESTERNICH TEST REPORTOVER 100 CYCLE
MORE THAN 2,400 HRS -
TEST 03HARDNESS TEST REPORTSURFACE HARDNESS：620-635 HV
CORE HARDNESS：559-563 HV
| 01 | METERIAL | John Tek #550 |
Bi-Metal |
C1022 |
|
| 02 |
SIZE |
#10 | #10 | #10 | |
| 03 |
TENSILE TEST |
161.9 kgf/mm2 | 70.7 kgf/mm2 | 132.4 kgf/mm2 | |
| 04 | SALT SPRAY TEST REPORT | 8,000-15,000 hours |
ZINC+WAXING | RUSPERT | ZINC |
| 24 HRS(5μ) 72 HRS(8μ) |
240~1,000 HRS | 24~48 HRS(5μ) 48~120 HRS(8μ) |
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MORE JOHN TEK 550 PRODUCT
CORPORATE WITH NIPPON STEEL FOR THE SPECIAL MATERIAL NSSC550 (YUS550)，SPENDING 18 YEARS TO DEVELOP IT.
rOOFING SCREW
JOHN TEK 550
YOU DON'T NEED TO WORRY ABOUT CHANGING IT OFTENLY, WHEN USING NSSC550 ROOFING SCREW. IT CAN PREVENT THE RUST FOR OVER 250 YEARS.
Read MorePOWDER-ACTUATED PIN
JOHN TEK 550
TO MEET THE EXPECTATION OF THE CUSTOMERS，WE LEVEL UP SURFACE CORE TO HRC 51 AND HEART CORE TO 49.
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