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10CR High Strength
“Tapping” Bolt
| “Designer” Steel Opens up New Opportunities |
| Application: As “Tapping” bolts or Grade 8.8~10.9 bolts in automotive, construction, etc. |
| Problem: Until now grade 8.8~10.9 bolts could only be made from medium carbon or
alloy steels which are higher priced and more difficult to cold form. High
strength bolts with “tapping” capabilities simply did not exist. |
| Solution: GTO’s patented 10CR, modified low carbon steel that can be thru-hardened
to manufacture the equivalent of grade 8.8~10.9 bolts or carburized to
create a completely new category of “tapping” bolts. |
| Features of GTO 10CR Material & Bolts: |
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Low carbon steel - good formability and tool life. |
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Can be thru-hardened to grade 8.8 or 10.9 strength. |
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Can be carburized to a high surface hardness of Hv 600~700 but still maintain
a relatively low core hardness of HRC 34~35 to create a “tapping” bolt. |
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Fine grain structure virtually eliminates risk of delayed fractures. |
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Material is less susceptible to rust after plating because of its chromium contents. |
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10CR with its good formability can be substituted for medium carbon or
alloy steels to create fasteners with complex shapes for high strength
fastener applications. |
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With carburizing heat treatment a tapping bolt can be manufactured that eliminates the need for a mating nut or a separate tapping operation in structural applications. |
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Greater overall productivity – lower in-place cost. |
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Greater rust resistance. |
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| For more information contact: |
 JICAM Pacific Co., Ltd. |
Toabo Bldg, 3rd Floor
No.1-4, 3-Chome, Kawara-machi
Chuo-ku, Osaka 541-0048, Japan |
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| Grade |
T/S (N/mm2)
(Max.) |
RA (%)
(Min.) |
Hardness HRB
(Min.) |
Grain Size |
| 10CR |
600 |
60 |
83 |
#11.5 (8 µ) |
| SWCH45K (1045) |
680 |
55 |
97 |
#9.5 (16 µ) |
SCM435
(4140) |
680 |
55 |
97 |
#9.5 (16 µ) |
| Mechanical Properties of 10CR Tapping Bolt (Carburizing Heat Treatment) |
| Item |
JIS Spec (min.) |
Samples after Plating |
| 1 |
2 |
3 |
4 |
5 |
6 |
| Tensile Break Load (N) |
20,900 |
21,860 |
22,060 |
21,940 |
22,140 |
22,320 |
22,000 |
| Tensile Strength (N/mm2) |
1,041
(150 ksi) |
1,087 |
1,097 |
1,091 |
1,101 |
1,110 |
1,094 |
| Yield Strength (N/mm2) |
940
(136 ksi) |
986 |
1,009 |
1,005 |
1,009 |
1,017 |
991 |
| Elongation % |
9.00 |
9.45 |
9.35 |
9.50 |
10.45 |
9.85 |
10.25 |
| Surface Hardness |
Hv600~700 |
Hv600~700 |
| Core Hardness |
HRC 32~36 |
HRC 32~36 |
| Mechanical Properties of 10CR Grade 10.9 Bolt (Thru-Hardening) |
| Item |
JIS Spec (min.) |
Samples after Plating |
| 1 |
2 |
3 |
4 |
5 |
6 |
| Tensile Break Load (N) |
20,900 |
22,700 |
22,400 |
22,540 |
22,460 |
22,480 |
22,460 |
| Tensile Strength (N/mm2) |
1,041
(150 ksi) |
1,129 |
1,114 |
1,121 |
1,117 |
1,118 |
1,117 |
| Yield Strength (N/mm2) |
940
(136 ksi) |
1,072 |
1,067 |
1,068 |
1,065 |
1,063 |
1,074 |
| Elongation % |
9.00 |
14.04 |
13.93 |
13.50 |
14.66 |
13.90 |
13.60 |
| Core Hardness |
HRC 32~36 |
HRC 32~36 |
High Performance
10AM Tapping Screws |
| Modified Low Carbon Steel Boosts Tapping Capabilities |
| Application: Tapping screws for high strength mating materials in automobiles, consumer appliances, electronics, etc. |
1016~1018 Tapping Screws(Threads Damaged) |
| Problem: Tapping screws made from conventional 1016 or 1018 steel wire will not
drive into the thinner, higher strength steel sheets (980MPa) that industry
is introducing to reduce product weight or the screws suffer serious thread
damage in the process. |
| Solution: Tapping screws made from patented, GTO 10AM modified low carbon steel. |
| Merits of GTO 10AM Tapping Screws: |
10AM Tapping Screws |
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High surface hardness (Hv600~730) yet mild, soft core hardness (Hv350~370). Applicable to screw size ranges M3~M6. |
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Low drive torque and fast drive time |
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Good ductility |
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Fine grain structure virtually eliminates risk of delayed fracture and
cracking |
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Elongation of material 8~9% compared with 1~2% for conventional low carbon
steels |
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Reliable, fast tapping into thin, high strength steel sheets |
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Greater productivity – lower in-place cost |
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Less thread damage permits loosening and re-fastening |
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| For more information contact: |
| JICAM Pacific Co., Ltd. |
Toabo Bldg, 3rd Floor
No.1-4, 3-Chome, Kawara-machi
Chuo-ku, Osaka 541-0048, Japan |
|
| Grain Structure after Case Hardening |
|
10AM γ GS # 11.5
|
1016γ GS # 9.5
 |
| Torque Performance (10AM versus 1016) |
| Item |
10AM Screws |
1016 Screws |
| Drive Torque |
Minimum |
1.43 N.m
(12.7 lb-in) |
1.84 N.m
(16.3 lb-in) |
| Maximum |
1.67 N.m
(14.8 lb-in) |
2.72 N.m
(24.1 lb-in) |
| Range |
0.23 |
0.88 |
| Average |
1.55 N.m
(13.7 lb-in) |
2.29 N.m
(20.3 lb-in) |
| Variation |
0.07 |
0.30 |
| Overall |
Low |
High |
| Drive Time |
Short |
Long |
| Thread Damage |
Virtually none |
Threads Damaged |
| Toughness |
OK |
OK |
| Lot # |
Sample # |
Surface Hardness (Hv) |
Core Hardness (Hv) |
| 10AM |
1016 |
10AM |
1016 |
| A |
1 |
663 |
533 |
360 |
323 |
| 2 |
644 |
539 |
359 |
310 |
| 3 |
629 |
523 |
359 |
316 |
| 4 |
626 |
563 |
364 |
|
| 5 |
628 |
549 |
370 |
|
| B |
1 |
637 |
565 |
357 |
338 |
| 2 |
611 |
541 |
358 |
344 |
| 3 |
608 |
533 |
356 |
325 |
| 4 |
660 |
560 |
364 |
|
| 5 |
655 |
554 |
367 |
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| Average |
|
636 |
546 |
361 |
326 |
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