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About Hex Head Screws and Bolts
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Choose a hex head fastener with the right threading, thread size, material, and strength for your equipment.
Mil. Spec. Steel Cotter-Pin-Locking Hex Head Screws
 |
 |
Partially Threaded |
Manufactured and tested to meet strict U.S. military specifications for material and construction. These screws secure rotating parts subjected to vibration, such as the wheels on carts and hand trucks. A cotter pin (not included) slides through the hole in the shank of these screws to keep nuts from loosening. They hold stronger than screws with threadlocker and lockwashers, but they aren’t recommended for high-vibration applications because prolonged stress can shear the pin. The head's six flat sides keep wrenches and sockets from slipping and rounding off the drive.
Length is measured from under the head.
Medium-Strength Fastener—Your go-to screws for fastening most machinery and equipment. They have tensile strengths from 90,000 to 120,000 psi.
Cadmium-Plated Steel—The plating reduces friction between the screw and your mounting surface to prevent sticking when you tighten or loosen screws. It also creates a barrier against rust.
Grip Length—Screws with a grip length have a precisely measured unthreaded section under the head, called a grip. It's stronger than the threaded section, so you can place it in joints exposed to sideways forces.
Head | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Grip Lg. | Wd. | Ht. | Hole Dia. | For Cotter Pin Dia. | Threading | Thread Spacing | Tensile Strength, psi | Mil. Spec. | Pkg. Qty. | Pkg. | |||
Medium-Strength Cadmium-Plated Steel | ||||||||||||||
1/4"-28 | ||||||||||||||
| 17/32" | 1/16" | 7/16" | 11/64" | 0.076" | 1/16" | Partially Threaded | Fine | 120,000 | AN4-4 | 10 | 94622A211 | 000000 | ||
| 21/32" | 3/16" | 7/16" | 11/64" | 0.076" | 1/16" | Partially Threaded | Fine | 120,000 | AN4-5 | 10 | 94622A212 | 00000 | ||
| 25/32" | 5/16" | 7/16" | 11/64" | 0.076" | 1/16" | Partially Threaded | Fine | 120,000 | AN4-6 | 10 | 94622A213 | 00000 | ||
| 1 1/32" | 9/16" | 7/16" | 11/64" | 0.076" | 1/16" | Partially Threaded | Fine | 120,000 | AN4-10 | 10 | 94622A214 | 00000 | ||
| 1 9/32" | 13/16" | 7/16" | 11/64" | 0.076" | 1/16" | Partially Threaded | Fine | 120,000 | AN4-12 | 10 | 94622A215 | 00000 | ||
| 1 17/32" | 1 1/16" | 7/16" | 11/64" | 0.076" | 1/16" | Partially Threaded | Fine | 120,000 | AN4-14 | 10 | 94622A216 | 00000 | ||
| 2 1/32" | 1 9/16" | 7/16" | 11/64" | 0.076" | 1/16" | Partially Threaded | Fine | 120,000 | AN4-20 | 10 | 94622A217 | 00000 | ||
5/16"-24 | ||||||||||||||
| 27/32" | 5/16" | 1/2" | 13/64" | 0.076" | 1/16" | Partially Threaded | Fine | 120,000 | AN5-6 | 5 | 94622A221 | 0000 | ||
| 1 3/32" | 9/16" | 1/2" | 13/64" | 0.076" | 1/16" | Partially Threaded | Fine | 120,000 | AN5-10 | 5 | 94622A222 | 00000 | ||
| 1 11/32" | 13/16" | 1/2" | 13/64" | 0.076" | 1/16" | Partially Threaded | Fine | 120,000 | AN5-12 | 5 | 94622A223 | 00000 | ||
| 1 19/32" | 1 1/16" | 1/2" | 13/64" | 0.076" | 1/16" | Partially Threaded | Fine | 120,000 | AN5-14 | 5 | 94622A224 | 00000 | ||
| 2 3/32" | 1 9/16" | 1/2" | 13/64" | 0.076" | 1/16" | Partially Threaded | Fine | 120,000 | AN5-20 | 5 | 94622A225 | 00000 | ||
3/8"-24 | ||||||||||||||
| 53/64" | 3/16" | 9/16" | 15/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN6-6 | 5 | 94622A231 | 00000 | ||
| 1 5/64" | 7/16" | 9/16" | 15/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN6-10 | 5 | 94622A232 | 00000 | ||
| 1 21/64" | 11/16" | 9/16" | 15/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN6-12 | 5 | 94622A233 | 00000 | ||
| 1 37/64" | 15/16" | 9/16" | 15/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN6-14 | 5 | 94622A234 | 00000 | ||
| 1 53/64" | 1 3/16" | 9/16" | 15/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN6-16 | 5 | 94622A235 | 00000 | ||
| 2 5/64" | 1 7/16" | 9/16" | 15/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN6-20 | 5 | 94622A236 | 00000 | ||
| 2 37/64" | 1 15/16" | 9/16" | 15/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN6-24 | 5 | 94622A237 | 00000 | ||
| 3 5/64" | 2 7/16" | 9/16" | 15/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN6-30 | 5 | 94622A238 | 00000 | ||
1/2"-20 | ||||||||||||||
| 1 3/32" | 5/16" | 3/4" | 19/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN8-10 | 1 | 94622A241 | 00000 | ||
| 1 11/32" | 9/16" | 3/4" | 19/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN8-12 | 1 | 94622A242 | 0000 | ||
| 1 19/32" | 13/16" | 3/4" | 19/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN8-14 | 1 | 94622A243 | 00000 | ||
| 1 27/32" | 1 1/16" | 3/4" | 19/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN8-16 | 1 | 94622A244 | 0000 | ||
| 2 3/32" | 1 5/16" | 3/4" | 19/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN8-20 | 1 | 94622A245 | 00000 | ||
| 2 19/32" | 1 13/16" | 3/4" | 19/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN8-24 | 1 | 94622A246 | 00000 | ||
| 3 3/32" | 2 5/16" | 3/4" | 19/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN8-30 | 1 | 94622A247 | 00000 | ||
| 3 19/32" | 2 13/16" | 3/4" | 19/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN8-34 | 1 | 94622A248 | 00000 | ||
| 4 3/32" | 3 5/16" | 3/4" | 19/64" | 0.106" | 3/32" | Partially Threaded | Fine | 120,000 | AN8-40 | 1 | 94622A249 | 00000 | ||
Mil. Spec. Steel Hex Head Screws
 |
Partially Threaded |
Manufactured and tested to meet strict U.S. military specifications for material and construction. These screws have a head with six flat sides to keep wrenches and sockets from slipping and rounding off the drive.
Length is measured from under the head.
Medium-Strength Fastener—Your go-to screws for fastening most machinery and equipment. They have tensile strengths from 90,000 to 120,000 psi.
Cadmium-Plated Steel—The plating reduces friction between the screw and your mounting surface to prevent sticking when you tighten or loosen screws. It also creates a barrier against rust.
Grip Length—Screws with a grip length have a precisely measured unthreaded section under the head, called a grip. It's stronger than the threaded section, so you can place it in joints exposed to sideways forces.
Head | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Grip Lg. | Wd. | Ht. | Threading | Thread Spacing | Tensile Strength, psi | Mil. Spec. | Pkg. Qty. | Pkg. | |||
Medium-Strength Cadmium-Plated Steel | ||||||||||||
1/4"-28 | ||||||||||||
| 17/32" | 1/16" | 7/16" | 11/64" | Partially Threaded | Fine | 120,000 | AN4-4A | 25 | 94622A411 | 000000 | ||
| 21/32" | 3/16" | 7/16" | 11/64" | Partially Threaded | Fine | 120,000 | AN4-5A | 25 | 94622A412 | 00000 | ||
| 25/32" | 5/16" | 7/16" | 11/64" | Partially Threaded | Fine | 120,000 | AN4-6A | 25 | 94622A413 | 00000 | ||
| 1 1/32" | 9/16" | 7/16" | 11/64" | Partially Threaded | Fine | 120,000 | AN4-10A | 10 | 94622A414 | 0000 | ||
| 1 9/32" | 13/16" | 7/16" | 11/64" | Partially Threaded | Fine | 120,000 | AN4-12A | 10 | 94622A415 | 00000 | ||
| 1 17/32" | 1 1/16" | 7/16" | 11/64" | Partially Threaded | Fine | 120,000 | AN4-14A | 10 | 94622A416 | 00000 | ||
| 2 1/32" | 1 9/16" | 7/16" | 11/64" | Partially Threaded | Fine | 120,000 | AN4-20A | 10 | 94622A417 | 00000 | ||
5/16"-24 | ||||||||||||
| 27/32" | 5/16" | 1/2" | 13/64" | Partially Threaded | Fine | 120,000 | AN5-6A | 10 | 94622A421 | 00000 | ||
| 1 3/32" | 9/16" | 1/2" | 13/64" | Partially Threaded | Fine | 120,000 | AN5-10A | 10 | 94622A422 | 00000 | ||
| 1 11/32" | 13/16" | 1/2" | 13/64" | Partially Threaded | Fine | 120,000 | AN5-12A | 10 | 94622A423 | 00000 | ||
| 1 19/32" | 1 1/16" | 1/2" | 13/64" | Partially Threaded | Fine | 120,000 | AN5-14A | 10 | 94622A424 | 00000 | ||
| 2 3/32" | 1 9/16" | 1/2" | 13/64" | Partially Threaded | Fine | 120,000 | AN5-20A | 10 | 94622A425 | 00000 | ||
3/8"-24 | ||||||||||||
| 53/64" | 3/16" | 9/16" | 15/64" | Partially Threaded | Fine | 120,000 | AN6-6A | 5 | 94622A431 | 00000 | ||
| 1 5/64" | 7/16" | 9/16" | 15/64" | Partially Threaded | Fine | 120,000 | AN6-10A | 5 | 94622A432 | 0000 | ||
| 1 21/64" | 11/16" | 9/16" | 15/64" | Partially Threaded | Fine | 120,000 | AN6-12A | 5 | 94622A433 | 00000 | ||
| 1 37/64" | 15/16" | 9/16" | 15/64" | Partially Threaded | Fine | 120,000 | AN6-14A | 5 | 94622A434 | 00000 | ||
| 1 53/64" | 1 3/16" | 9/16" | 15/64" | Partially Threaded | Fine | 120,000 | AN6-16A | 5 | 94622A435 | 00000 | ||
| 2 5/64" | 1 7/16" | 9/16" | 15/64" | Partially Threaded | Fine | 120,000 | AN6-20A | 5 | 94622A436 | 00000 | ||
| 2 37/64" | 1 15/16" | 9/16" | 15/64" | Partially Threaded | Fine | 120,000 | AN6-24A | 5 | 94622A437 | 00000 | ||
| 3 5/64" | 2 7/16" | 9/16" | 15/64" | Partially Threaded | Fine | 120,000 | AN6-30A | 5 | 94622A438 | 00000 | ||
1/2"-20 | ||||||||||||
| 1 3/32" | 5/16" | 3/4" | 19/64" | Partially Threaded | Fine | 120,000 | AN8-10A | 1 | 94622A441 | 0000 | ||
| 1 11/32" | 9/16" | 3/4" | 19/64" | Partially Threaded | Fine | 120,000 | AN8-12A | 1 | 94622A442 | 0000 | ||
| 1 19/32" | 13/16" | 3/4" | 19/64" | Partially Threaded | Fine | 120,000 | AN8-14A | 1 | 94622A443 | 0000 | ||
| 1 27/32" | 1 1/16" | 3/4" | 19/64" | Partially Threaded | Fine | 120,000 | AN8-16A | 1 | 94622A444 | 0000 | ||
| 2 3/32" | 1 5/16" | 3/4" | 19/64" | Partially Threaded | Fine | 120,000 | AN8-20A | 1 | 94622A445 | 0000 | ||
| 2 19/32" | 1 13/16" | 3/4" | 19/64" | Partially Threaded | Fine | 120,000 | AN8-24A | 1 | 94622A446 | 00000 | ||
| 3 3/32" | 2 5/16" | 3/4" | 19/64" | Partially Threaded | Fine | 120,000 | AN8-30A | 1 | 94622A447 | 0000 | ||
| 3 19/32" | 2 13/16" | 3/4" | 19/64" | Partially Threaded | Fine | 120,000 | AN8-34A | 1 | 94622A448 | 0000 | ||
| 4 3/32" | 3 5/16" | 3/4" | 19/64" | Partially Threaded | Fine | 120,000 | AN8-40A | 1 | 94622A449 | 00000 | ||
