Hexagon Socket Head Cap Screw: Mechanical & Technical Information

Hexagon Socket Head Cap Screw Drawing 

Hexagon Socket Head Cap Screw (ASME B18.3) | Units: mm

Nominal
Size of Screw

 Head
Diameter
(A)

Head
Height
(H)

 

 Body
Diameter
(E)		 Hexagon
Socket
Size
(S)

Key Engagement
(T)

Thread
Length
(LT)
Max Min Max Min Max Min Nom. Min Basic
#4 0.183 0.176 0.112 0.108 0.1120 0.1075 3/12 0.094 0.051 0.75
#6 0.226 0.218 0.138 0.134 0.1380 0.1329 7/64 0.109 0.064 0.75
#8 0.270 0.262 0.164 0.159 0.1640 0.1585 9/64 0.141 0.077 0.88
#10 0.312 0.303 0.190 0.185 0.1900 0.1840 5/32 0.156 0.090 0.88
1/4 0.375 0.365 0.250 0.244 0.2500 0.2435 3/16 0.188 0.120 1.00
5/16 0.469 0.457 0.312 0.306 0.3125 0.3053 1/4 0.250 0.151 1.12
3/8 0.562 0.550 0.375 0.368 0.3750 0.3678 5/16 0.312 .0182 1.25
7/16 0.656 0.642 0.438 0.430 0.4375 0.4294 3/8 0.375 0.213 1.38
1/2 0.750 0.735 0.500 0.492 0.5000 0.4919 3/8 0.375 0.245 1.50
5/8 0.938 0.921 0.625 0.616 0.6250 0.6163 1/2 0.500 0.307 1.75
3/4 1.125 1.107 0.750 0.740 0.7500 0.7406 5/8 0.625 0.370 2.00

 

According to: ASME B18.3
Material: Alloy Steel AISI 4135
Wedge Tensile: Min 180,000psi
Core Hardness: HRC 39~45
Surface Treatment: Plain
Screw Threads: ANSI B1.1 UNC, UNF
Class of Thread: #4 through 3/4, 3A