ASTM A325 Bolts

The ASTM A325 specification covers high strength heavy hex structural bolts from ½” diameter through 1-1/2” diameter. These bolts are intended for use in structural connections and therefore have shorter thread lengths than standard hex bolts. Refer to the Structural Bolts page of our site for thread lengths and other related dimensions.

ASTM F2329

ASTM F2329 covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special threaded fasteners applied

ASTM F1554

The ASTM F1554 specification was introduced in 1994 and covers anchor bolts designed to anchor structural supports to concrete foundations. F1554 anchor bolts

ASTM A563

The ASTM A563 specification covers the chemical and mechanical requirements for carbon and alloy steel nuts used on bolts, studs, and externally threaded fasteners.

ASTM A490

The ASTM A490 specification covers quenched and tempered, alloy steel, heavy hex structural bolts from ½” diameter through 1½” diameter with a minimum 150 ksi tensile.

ASTM A449

ASTM A449 covers headed bolts, rods, and anchor bolts in diameters ranging from 1/4"" through 3"" inclusive. It is a medium strength bolt manufactured from a medium carbon or alloy steel that develops its mechanical values through a heat treating process. It is intended for general engineering applications.

ASTM A307 Carriage Bolts

Carriage Bolts

Carriage bolts (round head with square neck) are commonly used in wood connections. The square neck under the round head will seat into the hole in the wood to prevent the head from turning. Because they are used with wood, carriage bolts are rarely high strength and virtually always supplied in a standard ASTM A307 specification.

Manufacturing

Taida Fasteners manufactures carriage bolts from 1/2" diameter through 1-1/4" diameter in most ASTM, AASHTO, and SAE specifications. Special tooling can be created to produce nonstandard head dimensions, carriage bolts larger than 1" in diameter, or bolt heads with your company's name and/or logo.

Standard Thread Length

Bolt lengths ≤ 6": Thread length = (2 X diameter) + 1/4"
Bolt lengths > 6": Thread length = (2 X diameter) + 1/2"

Note: Most stock carriage bolts have extended thread length.

Stock

Diameters: 3/8" - 3/4"
Lengths: 18" maximum
Origin: Import
Finish: Black and hot-dip galvanized

Dimensions

Bolt Diameter	D		C		H		P		F
	Body Diameter		Head Diameter		Head Height		Square Width		Square Depth
	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min
3/8	0.388	0.360	0.844	0.782	0.208	0.188	0.388	0.368	0.219	0.188
1/2	0.515	0.483	1.094	1.032	0.270	0.250	0.515	0.492	0.281	0.250
5/8	0.642	0.605	1.344	1.219	0.344	0.313	0.642	0.616	0.344	0.313
3/4	0.768	0.729	1.594	1.469	0.406	0.375	0.768	0.741	0.406	0.375
7/8	0.895	0.852	1.844	1.719	0.469	0.438	0.895	0.865	0.469	0.438
1	1.022	0.976	2.094	1.969	0.531	0.500	1.022	0.990	0.531	0.500
1-1/4*	1.277		2.850		0.531	0.500	1.250		0.625

*Dimensions per ASME B18.5 1990 (R 1998) cover diameters up to 1". Bolts over 1" use custom head dimensions.

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