Grain Bin Bolt: Dimensions & Specifications

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Grain Bin Bolt: Mechanical & Technical Information (ANSI B1.1 UNC, UNF)

Nominal
Size of Screw

 Width
Across
Flats
(F)		 Width
Across
Corners
(G)		 Head
Height
(H)		 Hex Height
(K)		 Flange Thickness
(U)

Under
Cut
Diameter
(C1)

 Under
Cut
Depth
(C2)

 Flange Diam
(B)
Max Min Max Min Max Min Min Max Min Max Min Max Min Max
5/16 0.500 0.489 0.577 0.548 0.318 0.303 0.210 0.08 0.06 0.584 0.560 0.050 0.040 0.73
3/8 0.562 0.550 0.650 0.618 0.380 0.365 0.256 0.08 0.06 0.655 0.655 0.050 0.040 0.81
7/16 0.625 0.612 0.722 0.685 0.440 0.410 0.300 0.09 0.07 0.729 0.729 0.050 0.040 0.95

 

Grade 8.2
Material: 10B21
Tensile Strength: Min 150,000 psi
Core Hardness: HRC 33~39
Surface Hardness: HR30N MAX 58.6
Screw Threads: ANSI B1.1 UNC, UNF
Class of Thread: 5/16 through 7/16, 2A