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Alma Bolt Company & Prime Fasteners 1-800-526-2200

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Flanged Bolts

Grade Eight Flanged Bolts

These bolts feature an added flange, speeding assembly by eliminating the washer. They provide four times the bearing area of a standard hex screw. Manufactured from high carbon alloy steel, they meet the 150,000 PSI minimum tensile strength requirement of SAE J429 Grade 8. Stocked in diameters from 3/8" to 3/4" and lengths up to 31/2", measured from the base of the head.

Group codes represented: FB8
Part# examples: 37U100FB8, 62U600FB8, 75S550FB8

Nominal Size
E
F
G
B
U
D
H
LT
Tensile Strength
Proof Load, Lbs.
Body Diameter
Width Across Flats
Width Across Corners
Flange Dia.
Flange Thick-ness
Head Height
Hex Height
Thread Length
Max
Min
Basic
Max
Min
Max
Min
Max
Min
Max
Min
Basic
1/4 0.2500 0.2450

3/8

 0.3750 0.367 0.433 0.409 0.56 0.04 0.280 0.17 0.750 4750 3800
5/16 0.3125 0.3065 1/2 0.5000 0.489 0.577 0.548 0.68 0.05 0.320 0.21 0.875 7850 6300
3/8 0.3750 0.3690 9/16 0.5625 0.551 0.650 0.618 0.81 0.06 0.425 0.25 1.000 11600 9300
7/16 0.4375 0.4305 5/8 0.6250 0.612 0.722 0.685 0.93 0.07 0.460 0.30 1.125 15900 12800
1/2 0.5000 0.4930 3/4 0.7500 0.736 0.866 0.825 1.07 0.08 0.555 0.34 1.250 21300 17000
5/8 0.6250 0.6170
15/16
 0.9375 0.922 1.083 1.034 1.33 0.10 0.690 0.42 1.500 33900 27100
3/4 0.7500 0.7410 1-1/8 1.1250 1.100 1.299 1.234 1.59 0.11 0.825 0.51 1.750 50100 40100
Tolerance on Length
Nominal Bolt Size
Nominal Bolt Length
Up to 1in., incl.
Over 1 in. to 2-1/2 in., incl.
Over 2-1/2 in. to 4 in., incl.
1/4 to 3/8
-0.03
-0.04
-0.06
7/16 and 1/2
-0.03
-0.06
-0.08
5/8 and 3/4
-0.03
-0.08
-0.1
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