Grade-8 Hex Washer Frame Bolts

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Grade-8 Hex Washer Frame Bolts Mechanicals & Performance Data

Grade-8 Alloy Hex Washer Frame Bolts - IFI 111 & SAE J429

Nominal Size	E		W			G		F	U	D	H	LT	Tensile Strength Lbs	Proof Load Lbs
	Body Diameter		Width Across Flats			Width Across Corners		Flange Diameter	Flange Thickness	Head Height	Hex Height	Thread Length
	Max	Min	Basic	Max	Min	Max	Min	Max	Min	Max	Min	Basic
1/4	.250	.245	3/8	.375	.367	.433	.409	.56	.04	.28	.17	.750	4,750	3,800
5/16	.3125	.3065	1/2	.500	.489	.577	.548	.68	.05	.32	.21	.875	7,850	6,300
3/8	.375	.369	9/16	.5625	.551	.650	.618	.81	.06	.425	.25	1.000	11,600	9,300
7/16	.4375	.4305	5/8	.625	.612	.722	.685	.93	.07	.46	.30	1.125	15,900	12,800
1/2	.500	.493	3/4	.750	.736	.866	.825	1.07	.08	.555	.34	1.250	21,300	17,000
9/16	.5625	.5545	13/16	.8125	.798	.938	.895	1.19	.09	.57	.38	1.375	27,300	21,800
5/8	.625	.617	15/16	.9375	.922	1.083	1.034	1.33	.10	.690	.42	1.500	33,900	27,100
3/4	.750	.741	1-1/8	1.125	1.100	1.299	1.234	1.59	.11	.825	.51	1.750	50,100	40,100

Tolerance on Length	Nominal Bolt Size	Nominal Bolt Length
		Up to 1 inch Included	Over 1 inch to 2-1/2 inch, Incl.	Over 2-1/2 inch to 4 inch, Incl.	Over 4 inch to 6 inch Incl.
	1/4 thru 3/8	-.03	-.04	-.06	-.10
	7/16 and 1/2	-.03	-.06	-.08	-.10
	5/8 thru 3/4	-.03	-.08	-.10	-.10
The length of a frame bolt is measured from the under-head bearing surface to the extreme end of the screw.

Mechanical & Performance Data for
Grade-8 Alloy Hex Washer Frame Bolts

Description	A one-piece hex-washer head bolt, made of high-alloy steel, with a flat bearing surface.
Applications and Advantages	Used on truck frames. The flange eliminates washers and helps compensate for a misaligned hole. Used with a grade-Gt lock nut, the bolt system resists bolt slippage by distributing the clamp load over a wide area.
Material	AISI 4037 or equivalent alloy steel
Heat Treatment	Heat treated, quenched and tempered at a minimum temperature of 800°F.
Core Hardness	Rockwell C33 - C39
Surface Hardness	Rockwell 30N58.6 maximum
Tensile Strength	150,000 psi minimum
Yield Strength	130,000 psi minimum
Proof Load	120,000 psi minimum
Plating	See plating page for plating information
Product standards require the manufacturer head marking to appear on top of the bolts head. The X on the head in the image above represents a location of the mark.

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