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DFARS Specialty Metals
Steel Socket Head Screws with Split Lock Washer
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Light vibration won't loosen these screws. As you twist, the uneven ends of the washer bite into the screw and mating surface for a tight hold. Also known as Sems screws, the washer rotates freely but is permanently attached. These are our strongest alloy steel screws. Their deep, six-point socket keeps hex keys from slipping out and damaging the drive.
Length is measured from under the head.
Black-Oxide Alloy Steel—Best for dry environments since moisture will cause these screws to rust. They have a dark, matte appearance.
Head | Washer | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Dia. | Ht. | OD | Thk. | Threading | Thread Spacing | Tensile Strength, psi | Each | |||
Black-Oxide Alloy Steel | |||||||||||
4-40 | |||||||||||
| 1/4" | 0.183" | 0.112" | 11/64" | 0.03" | Fully Threaded | Coarse | 180,000 | 90342A111 | 00000 | ||
| 3/8" | 0.183" | 0.112" | 11/64" | 0.03" | Fully Threaded | Coarse | 180,000 | 90342A112 | 0000 | ||
| 1/2" | 0.183" | 0.112" | 11/64" | 0.03" | Fully Threaded | Coarse | 180,000 | 90342A113 | 0000 | ||
6-32 | |||||||||||
| 1/4" | 0.226" | 0.138" | 0.204" | 0.04" | Fully Threaded | Coarse | 180,000 | 90342A114 | 0000 | ||
| 3/8" | 0.226" | 0.138" | 0.204" | 0.04" | Fully Threaded | Coarse | 180,000 | 90342A115 | 0000 | ||
| 1/2" | 0.226" | 0.138" | 0.204" | 0.04" | Fully Threaded | Coarse | 180,000 | 90342A116 | 0000 | ||
8-32 | |||||||||||
| 3/8" | 0.27" | 0.164" | 0.243" | 3/64" | Fully Threaded | Coarse | 180,000 | 90342A117 | 0000 | ||
| 1/2" | 0.27" | 0.164" | 0.243" | 3/64" | Fully Threaded | Coarse | 180,000 | 90342A118 | 0000 | ||
| 5/8" | 0.27" | 0.164" | 0.243" | 3/64" | Fully Threaded | Coarse | 180,000 | 90342A119 | 0000 | ||
| 3/4" | 0.27" | 0.164" | 0.243" | 3/64" | Fully Threaded | Coarse | 180,000 | 90342A120 | 0000 | ||
| 1" | 0.27" | 0.164" | 0.243" | 3/64" | Fully Threaded | Coarse | 180,000 | 90342A121 | 0000 | ||
10-32 | |||||||||||
| 3/8" | 5/16" | 0.19" | 19/64" | 3/64" | Fully Threaded | Fine | 180,000 | 90342A122 | 0000 | ||
| 1/2" | 5/16" | 0.19" | 19/64" | 3/64" | Fully Threaded | Fine | 180,000 | 90342A123 | 0000 | ||
| 3/4" | 5/16" | 0.19" | 19/64" | 3/64" | Fully Threaded | Fine | 180,000 | 90342A124 | 0000 | ||
| 1" | 5/16" | 0.19" | 19/64" | 3/64" | Fully Threaded | Fine | 180,000 | 90342A125 | 0000 | ||
1/4"-20 | |||||||||||
| 3/8" | 3/8" | 1/4" | 0.354" | 1/16" | Fully Threaded | Coarse | 180,000 | 90342A126 | 0000 | ||
| 1/2" | 3/8" | 1/4" | 0.354" | 1/16" | Fully Threaded | Coarse | 180,000 | 90342A127 | 0000 | ||
| 3/4" | 3/8" | 1/4" | 0.354" | 1/16" | Fully Threaded | Coarse | 180,000 | 90342A128 | 0000 | ||
| 1" | 3/8" | 1/4" | 0.354" | 1/16" | Fully Threaded | Coarse | 180,000 | 90342A129 | 0000 | ||
| 1 1/4" | 3/8" | 1/4" | 0.354" | 1/16" | Fully Threaded | Coarse | 180,000 | 90342A130 | 0000 | ||
 Alloy Steel Socket Head Screw with Split Lock Washer, 1/4"-20 Thread Size, 1-1/4" Long EachIn stock  Select a compatible file type: Parasolid Compatible Products for This Socket Head Screw | |||||||||||
| 1 1/2" | 3/8" | 1/4" | 0.354" | 1/16" | Fully Threaded | Coarse | 180,000 | 90342A131 | 0000 | ||
Other Socket Head Screws
