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Portland Bolt Manufactured Lag Screws
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Hex Lag Screws

Hex bolts (six sided heads) are the industry standard for fasteners with forged heads. ASTM A307 grade A bolts, all SAE hex bolts, and several other common specifications require a standard (finished) hex head. For specifications such as A307 grade B, A325 and A490 that require a heavy hex pattern, refer to dimensional tolerances for heavy hex bolts or structural bolts.

MANUFACTURING

Portland Bolt manufactures lag screws from 1/2" diameter through 1-1/2" diameter in most ASTM, AASHTO, and SAE specifications. Special tooling can be created to produce nonstandard head dimensions or bolt heads with your company’s name and/or logo.

One should consider longer than standard thread lengths for lag screws which are extremely long. Unless otherwise specified, Portland Bolt manufactures nonstandard lag screw with a thread length of one-half the bolt length plus 1/2" regardless of the length of the bolt. Unless otherwise specified, nonstandard lag screws manufactured by Portland Bolt will possess a semi-cone point rather than a gimlet or cone point. A full point is unnecessary since a pilot hole nearly as large as the root diameter of the lag screw will need to be drilled prior to installation. Additionally, a gimlet point is designed for small diameter screws so they can be installed without a pilot hole. Lag screws in diameters listed in the above table do not require a gimlet point since too much torque would be required to install the large screws without drilling a pilot hole first. Without a pilot hole, the heads of the screws will often break before the lag is properly installed.

STOCK

Diameters: 1/2" - 3/4"
Lengths: 18" maximum
Origin: Import
Finish: Black and hot-dip galvanized

STANDARD THREAD LENGTH

The minimum thread length shall be equal to one-half the nominal screw length plus 1/2" or 6”, whichever is less.

Note: Hex lag screws larger than 3/4" in diameter and all square lag screws are rarely available in the marketplace as a stock item.

Dimensions

Bolt
Diameter		DFHThreads
Per
Inch		Thread Dimension
Body DiameterWidth Across
Flats		Head
Height
MaxMinPitch
Flat
At
Root		Depth
of
Thread		Root
Diameter
3/8 0.388 0.360 9/16 1/4 7 0.143 0.062 0.055 0.265
1/2 0.515 0.482 3/4 11/32 6 0.167 0.072 0.064 0.371
5/8 0.642 0.605 15/16 27/64 5 0.200 0.086 0.077 0.471
3/4 0.768 0.729 1-1/8 1/2 4-1/2 0.222 0.096 0.085 0.579
7/8 0.895 0.852 1-5/16 37/64 4 0.250 0.108 0.096 0.683
1 1.022 0.976 1-1/2 43/64 3-1/2 0.286 0.123 0.110 0.780
1-1/8 1.149 1.098 1-11/16 3/4 3-1/4 0.308 0.133 0.119 0.887
1-1/4 1.277 1.223 1-7/8 27/32 3-1/4 0.308 0.133 0.119 1.012
1-3/8 1.404 1.346 2-1/16 29/32 3 0.333 0.143 0.128 1.119
1-1/2 1.531 1.469 2-1/4 1 3 0.333 0.143 0.128 1.244

Dimensions per ASME B18.2.1 1996