FLAT HEAD SLOTTED CAP SCREWS
Earnest Machine Products line of Flat Head Slotted Cap Screws (also called Slotted Flat Countersunk Head Cap Screws) are manufactured to the dimensional requirements specified in ASME/ANSI B18.6.2. The flat head design provides a low profile head that provides a large bearing area under the head when installed into an 82° countersunk hole.
The material and physical properties meet the requirements specified in SAE J429 for Grade 5 screws.
Tensile Strength - 120,000 psi min
Rockwell Hardness Rc 25/34
Alternative Slot Design
Nom.
Dia. |
Body
Diameter |
Head Dia. |
Head
Height |
Slot Width |
Slot Depth |
Slot Length |
Slot Width |
| E |
A |
H |
J |
T |
B |
J
(for Alternative
Slot Design only) |
| Max |
Min |
Max |
Min |
Ref. |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
| 1/2 |
.5000 |
.4930 |
.875 |
.791 |
.210 |
.106 |
.091 |
.103 |
.068 |
.583 |
.504 |
.106 |
.091 |
| 9/16 |
.5625 |
.5545 |
1.000 |
.906 |
.244 |
.118 |
.102 |
.120 |
.080 |
.661 |
.582 |
.120 |
.104 |
| 5/8 |
.6250 |
.6170 |
1.125 |
1.020 |
.281 |
.133 |
.116 |
.137 |
.091 |
.831 |
.660 |
.135 |
.118 |
| 3/4 |
.7500 |
.7410 |
1.375 |
1.251 |
.352 |
.149 |
.131 |
.171 |
.115 |
1.039 |
.797 |
.164 |
.146 |
| 7/8 |
.8750 |
.8660 |
1.625 |
1.480 |
.423 |
.167 |
.147 |
.206 |
.138 |
1.303 |
.953 |
.193 |
.173 |
| 1 |
1.0000 |
.9900 |
1.875 |
1.711 |
.494 |
.188 |
.166 |
.240 |
.162 |
1.559 |
1.441 |
.188 |
.166 |
| 1 1/8 |
1.1250 |
1.1140 |
2.062 |
1.880 |
.529 |
.196 |
.178 |
.257 |
.173 |
1.665 |
1.508 |
.196 |
.178 |
| 1 1/4 |
1.2500 |
1.2390 |
2.312 |
2.110 |
.600 |
.211 |
.193 |
.291 |
.197 |
1.917 |
1.760 |
.211 |
.193
|
The slots on the Earnest line of flat heads may be manufactured by slotting the full length of the head or (for the most popular sizes) Earnest utilizes a cold formed slot that increases the head strength and prevents collapsing of the slot when the screws are assembled into missed formed or damaged slots or subjected to high working loads in the application. The Earnest cold formed slot does not extend to the outside edge of the head. The material that remains provides added strength to the head. The alternative slot design is only applied to high volume sizes. Check with your Earnest representative for availability and sizes.