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Concealed Head -Koster- CFHA, CFHC, CHA, CHC , Installed in the milling blind hole , concealed head bolt request opposite side without damage.
All dimensions are in inches.
| Thread Size | Model | Thread Code | Length"L"±0.15 Length Code is in 16nds of an inch |
Min. Sheet Thickness .
|
Hole Size in Sheet +.003 -.000
|
Min.Depth of Blind Hole |
A Max.
|
E ±.010
|
C Max.
|
Min.Dist Hole C/L To Edge | Max Hole In Attached Parts | ||||||
| Aluminum | Stainless Steel | .250 | .375 | .500 | .625 | .750 | 1.00 | ||||||||||
|
.112-40 (#4-40) |
CHA CFHA |
CHC CFHC |
440 | 4 | 6 | 8 | 10 | 12 | NA |
.62 .93 |
.172 |
.043 .075 |
.043 .075 |
.025 | .171 | .156 | .135 |
|
.138-32 (#6-32) |
CHA CFHA |
CHC CFHC |
632 | 4 | 6 | 8 | 10 | 12 | 16 |
.62 .93 |
.213 |
.043 .075 |
.043 .075 |
.250 | .212 | .188 | .160 |
|
.164-32 (#8-32) |
CHA CFHA |
CHC CFHC |
832 | 4 | 6 | 8 | 10 | 12 | 16 |
.62 .93 |
.290 |
.043 .075 |
.043 .075 |
.328 | .289 | .219 | .185 |
|
.190-32 (#10-32) |
CHA CFHA |
CHC CFHC |
032 | NA | 6 | 8 | 10 | 12 | 16 |
.62 .93 |
.312 |
.043 .075 |
.043 .075 |
.350 | .350 | .250 | .210 |
All dimenstions are in millimeters.
| Thread Size | Model | Thread Code |
Length"L"±0.4 Length Code is in millimeters |
Min. Sheet Thickness . |
Hole Size in Sheet +.003 -.000 |
Min.Depth of Blind Hole |
A Max. |
E ±.010
|
C Max. |
Min.Dist Hole C/L To Edge | Max Hole In Attached Parts | ||||||
| Aluminum | Stainless Steel | ||||||||||||||||
| M3×0.5 |
CHA CFHA |
CHC CFHC |
M3 | 6 | 8 | 10 | 12 | 16 | NA |
1.6 2.4 |
4.37 |
1.1 1.91 |
1.1 1.91 |
5.21 | 4.35 | 4 | 3.6 |
| M4×0.7 |
CHA CFHA |
CHC CFHC |
M4 | 6 | 8 | 10 | 12 | 16 | 25 |
1.6 2.4 |
7.37 |
1.1 1.91 |
1.1 1.91 |
8.33 | 7.35 | .5.6 | 4.6 |
| M5×0.8 |
CHA CFHA |
CHC CFHC |
M5 | NA | NA | 10 | 12 | 16 | 25 |
1.6 2.4 |
7.93 |
1.1 1.91 |
1.1 1.91 |
8.89 | 7.9 | 6.4 | 5.6 |
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