About Rounded Head Screws
More
About Socket Head Screws
More
About Thumb Screw and Binding Post Materials
More
About Tapping Screws
More
18-8 Stainless Steel Thread-Locking Socket Head Screws
Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic. A thread locker bonded to the threads adds friction to resist loosening from vibration. Dimensions meet ASME B18.3 or ISO 4762 (formerly DIN 912) specifications. Length is measured from under the head.
Screws with an epoxy adhesive provide a permanent bond; once tightened, the epoxy expands to seal the gaps between the mating threads.
Coarse threads are the industry standard; choose these screws if you don’t know the pitch or the threads per inch. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Thread Spacing  | Dia. | Ht. | Drive Size | Tensile Strength, psi | Thread Locker Temp. Range, °F | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel with Epoxy Adhesive | |||||||||||
4-40 | |||||||||||
| 1/4" | Fully Threaded | Coarse | 0.183" | 0.112" | 3/32" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 00000 |
| 5/16" | Fully Threaded | Coarse | 0.183" | 0.112" | 3/32" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 3/8" | Fully Threaded | Coarse | 0.183" | 0.112" | 3/32" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Coarse | 0.183" | 0.112" | 3/32" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
6-32 | |||||||||||
| 1/4" | Fully Threaded | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 3/8" | Fully Threaded | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 5/8" | Fully Threaded | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 3/4" | Fully Threaded | Coarse | 0.226" | 0.138" | 7/64" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
8-32 | |||||||||||
| 3/8" | Fully Threaded | Coarse | 0.27" | 0.164" | 9/64" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Coarse | 0.27" | 0.164" | 9/64" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 5/8" | Fully Threaded | Coarse | 0.27" | 0.164" | 9/64" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 3/4" | Fully Threaded | Coarse | 0.27" | 0.164" | 9/64" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 1" | Fully Threaded | Coarse | 0.27" | 0.164" | 9/64" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
10-32 | |||||||||||
| 3/8" | Fully Threaded | Fine | 5/16" | 0.19" | 5/32" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Fine | 5/16" | 0.19" | 5/32" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 5/8" | Fully Threaded | Fine | 5/16" | 0.19" | 5/32" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 3/4" | Fully Threaded | Fine | 5/16" | 0.19" | 5/32" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 1" | Fully Threaded | Fine | 5/16" | 0.19" | 5/32" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
1/4"-20 | |||||||||||
| 3/8" | Fully Threaded | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 5/8" | Fully Threaded | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 3/4" | Fully Threaded | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 7/8" | Fully Threaded | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 1" | Fully Threaded | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | Coarse | 3/8" | 1/4" | 3/16" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
5/16"-18 | |||||||||||
| 3/4" | Fully Threaded | Coarse | 15/32" | 5/16" | 1/4" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
3/8"-16 | |||||||||||
| 1" | Fully Threaded | Coarse | 9/16" | 3/8" | 5/16" | 70,000 | -60° to 300° | ASME B18.3 | 1 | 000000000 | 0000 |
Ultra Vibration-Resistant Thread-Locking Rounded Head Screws
As you tighten the screw, the epoxies mix. Once hardened, these screws provide twice the holding power of standard thread-locking screws. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. Their Torx drive provides more points of contact than other drives, allowing you to tighten the screw without damaging the recess. For Torx tools, see Torx bits, keys, and drivers. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
| Lg. | Threading | Head Dia. | Head Ht. | Drive Size | Tensile Strength, psi | Begins to Harden, hrs. | Reaches Full Strength, hrs. | Thread Locker Temperature Range, °F | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
4-40 | |||||||||||
| 1/4" | Fully Threaded | 0.213" | 0.059" | T8 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 000000 |
| 3/8" | Fully Threaded | 0.213" | 0.059" | T8 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
| 1/2" | Fully Threaded | 0.213" | 0.059" | T8 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
6-32 | |||||||||||
| 3/8" | Fully Threaded | 0.262" | 0.073" | T10 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
| 1/2" | Fully Threaded | 0.262" | 0.073" | T10 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.262" | 0.073" | T10 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
8-32 | |||||||||||
| 3/8" | Fully Threaded | 0.312" | 0.087" | T15 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
| 1/2" | Fully Threaded | 0.312" | 0.087" | T15 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.312" | 0.087" | T15 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
10-32 | |||||||||||
| 3/8" | Fully Threaded | 0.361" | 0.101" | T25 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
| 1/2" | Fully Threaded | 0.361" | 0.101" | T25 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.361" | 0.101" | T25 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
1/4"-20 | |||||||||||
| 1/2" | Fully Threaded | 0.437" | 0.132" | T27 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.437" | 0.132" | T27 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
| 1" | Fully Threaded | 0.437" | 0.132" | T27 | 70,000 | 4 | 72 | -65° to 300° | 5 | 000000000 | 00000 |
Drilling Screws for Joining Insulation to Metal
Also known as roofing screws, these screws are long and made from hardened steel to fasten rigid insulation board to steel decking. They save you time and effort by drilling their own holes and fastening in a single operation. Made from steel, they're coated to resist corrosion in wet environments. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Max. Drilling Thick. | Dia. | Ht. | Drive Size | Approximate Threads per Inch | Threading | Thread Length | For Use In | Specifications Met | Pkg. Qty. | Pkg. | |
Black Epoxy-Coated Steel | ||||||||||||
No. 15 | ||||||||||||
| 2" | 0.047" | 0.435" | 0.118" | No. 3 | 13 | Fully Threaded | __ | Steel, Insulation, Sheet Metal | FM Approved | 50 | 000000000 | 000000 |
| 3" | 0.047" | 0.435" | 0.118" | No. 3 | 13 | Fully Threaded | __ | Steel, Insulation, Sheet Metal | FM Approved | 25 | 000000000 | 00000 |
| 4" | 0.047" | 0.435" | 0.118" | No. 3 | 13 | Partially Threaded | 3" | Steel, Insulation, Sheet Metal | FM Approved | 25 | 000000000 | 00000 |
| 5" | 0.047" | 0.435" | 0.118" | No. 3 | 13 | Partially Threaded | 4" | Steel, Insulation, Sheet Metal | FM Approved | 20 | 000000000 | 00000 |
| 6" | 0.047" | 0.435" | 0.118" | No. 3 | 13 | Partially Threaded | 4" | Steel, Insulation, Sheet Metal | FM Approved | 10 | 000000000 | 0000 |
| 7" | 0.047" | 0.435" | 0.118" | No. 3 | 13 | Partially Threaded | 4" | Steel, Insulation, Sheet Metal | FM Approved | 10 | 000000000 | 00000 |
| 8" | 0.047" | 0.435" | 0.118" | No. 3 | 13 | Partially Threaded | 4" | Steel, Insulation, Sheet Metal | FM Approved | 10 | 000000000 | 00000 |
| 10" | 0.047" | 0.435" | 0.118" | No. 3 | 13 | Partially Threaded | 4" | Steel, Insulation, Sheet Metal | FM Approved | 5 | 000000000 | 00000 |
Sealing Binding Barrels and Screws
Sealed with PVC foam under the head to prevent leaks and keep contaminants out. Barrels and screws have a low-profile head with a Torx drive. Screws have a knurled shoulder that resists rotation and adhesive on the threads to resist loosening. They're also known as Camtainer fasteners. A zinc plating provides corrosion resistance in wet environments. Barrel length is measured from under the head; screw length is measured from under the shoulder.
For technical drawings and 3-D models, click on a part number.
Barrel | Screw | Thread Locker | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Material Thick. | Lg. | Dia. | Head Dia. | Head Ht | Drive Size | Lg. | Head Dia. | Head Ht. | Seal Temperature Range, °F | Type | Temperature Range, °F | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | ||||||||||||||
5/16"-18 | ||||||||||||||
| 0.695" to 0.744" | 3/8" | 25/64" | 1" | 5/32" | T55 | 39/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 000000 |
| 0.72" to 0.814" | 3/8" | 25/64" | 1" | 5/32" | T55 | 47/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 0.82" to 0.869" | 1/2" | 25/64" | 1" | 5/32" | T55 | 39/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 0.82" to 0.939" | 1/2" | 25/64" | 1" | 5/32" | T55 | 47/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 0.845" to 0.939" | 1/2" | 25/64" | 1" | 5/32" | T55 | 55/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 0.935" to 0.984" | 5/8" | 25/64" | 1" | 5/32" | T55 | 39/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 0.935" to 1.054" | 5/8" | 25/64" | 1" | 5/32" | T55 | 47/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 0.935" to 1.179" | 5/8" | 25/64" | 1" | 5/32" | T55 | 55/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 0.97" to 1.064" | 3/8" | 25/64" | 1" | 5/32" | T55 | 63/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 0.97" to 1.189" | 1/2" | 25/64" | 1" | 5/32" | T55 | 63/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 0.97" to 1.304" | 5/8" | 25/64" | 1" | 5/32" | T55 | 63/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 1.22" to 1.439" | 1/2" | 25/64" | 1" | 5/32" | T55 | 1 15/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 1.22" to 1.554" | 5/8" | 25/64" | 1" | 5/32" | T55 | 1 15/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 1.32" to 1.369" | 1" | 25/64" | 1" | 5/32" | T55 | 39/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 1.32" to 1.564" | 1" | 25/64" | 1" | 5/32" | T55 | 55/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 1.32" to 1.689" | 1" | 25/64" | 1" | 5/32" | T55 | 63/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 1.32" to 1.939" | 1" | 25/64" | 1" | 5/32" | T55 | 1 15/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 1.401" to 1.495" | 3/8" | 25/64" | 1" | 5/32" | T55 | 1 27/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 1.401" to 1.62" | 1/2" | 25/64" | 1" | 5/32" | T55 | 1 27/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |
| 1.401" to 2.12" | 1" | 25/64" | 1" | 5/32" | T55 | 1 27/64" | 7/8" | 3/16" | -40° to 300° | Epoxy Patch | -65° to 300° | 5 | 000000000 | 00000 |