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Home / Products / Bolts / Countersunk Head Bolts / ASME/ANSI B18.5 (T7):2012 Inch Series Countersunk Head Slotted Bolt

ASME/ANSI B18.5 (T7):2012 Inch Series Countersunk Head Slotted Bolt

ASME/ANSI B18.5 (T7):2012 Inch Series Countersunk Head Slotted Bolt is used in inch-series assemblies where a low exposed surface is required and the head may need auxiliary positioning or light adjustment. The slot allows use of a flat-blade tool.

The countersunk head seats into a tapered recess to create a relatively flush surface, making it suitable for wood panels, decorative plates, equipment covers, furniture-style structures, and light mechanical joints. The slot can also help identify head orientation during maintenance.

Countersink angle, slot size, thread series, and surface quality should be controlled. For high-torque applications, tightening should not rely only on the slot; the nut side can be used to manage the main clamping process.

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Dimensions unit: mm

Thread size d  1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2
ds Max. 0.26 0.324 0.388 0.452 0.515 0.642 0.768 0.895 1.022 1.149 1.277 1.404 1.531
Min. 0.237 0.298 0.36 0.421 0.483 0.605 0.729 0.852 0.976 1.098 1.223 1.345 1.47
dk Max. 0.493 0.618 0.74 0.803 0.935 1.169 1.402 1.637 1.869 2.104 2.337 2.571 2.804
Min. 0.477 0.598 0.715 0.778 0.905 1.132 1.357 1.584 1.81 2.037 2.262 2.489 2.715
k Max. 0.15 0.189 0.225 0.226 0.269 0.336 0.403 0.47 0.537 0.604 0.671 0.738 0.805
Min. 0.131 0.164 0.196 0.196 0.233 0.292 0.349 0.408 0.466 0.525 0.582 0.641 0.698
n Max. 0.075 0.084 0.094 0.094 0.106 0.133 0.149 0.167 0.188 0.196 0.211 0.226 0.258
Min. 0.064 0.072 0.081 0.081 0.091 0.116 0.131 0.147 0.166 0.178 0.193 0.208 0.24
t Max. 0.068 0.086 0.103 0.103 0.103 0.137 0.171 0.206 0.24 0.257 0.291 0.326 0.36
Min. 0.045 0.057 0.068 0.068 0.068 0.091 0.115 0.138 0.162 0.173 0.197 0.22 0.244

①,Minimum thread length:

The minimum length of the threads shall be equal to twice the basic bolt diameter plus 0.25 inch for nominal bolt lengths of 6 inches or less, and twice the basic bolt diameter plus 0.50 inch for longer nominal lengths.

Bolts whose nominal length is too short to accommodate the minimum thread length shall be fully threaded. The length from the head or neck to the first full (full) thread shall not exceed 2-1/2 threads (sizes 1 inch or less) and 3-1/2 threads (sizes greater than 1 inch).

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