How to Install Key-Locking Inserts
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How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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Extreme-Pressure Stainless Steel Threaded Pipe Fittings
With the strength to handle extreme pressures, these fittings can be used to connect equipment in hydraulic fluid lines. 316 stainless steel fittings have excellent corrosion resistance. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have a gasket to prevent leaks.
- For Use With: Hydraulic Fluid, Oil, Water
316 Stainless Steel | |||||
|---|---|---|---|---|---|
| Pipe Size (A)  | Dash Size (A) | Thread Size (B) | Max. Pressure | Each | |
NPT Female × UN/UNF (SAE Straight) Female | |||||
| 1/2 | 08 | 1 1/8"-12 | 15,000 psi @ 72° F | 000000000 | 0000000 |
- Specifications Met: See table
- For Use With: See table
316 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
| Thread Size (A) | Pipe Size (B) | Dash Size (B) | Max. Pressure | For Use With | Each | |
UN/UNF (SAE Straight) Female × NPT Male | ||||||
| 1 1/8"-12 | 1/2 | 08 | 15,000 psi @ 72° F | Hydraulic Fluid, Oil, Water | 000000000 | 0000000 |
Mil. Spec. Stainless Steel Key-Locking Inserts
These inserts are made to stringent military specifications. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. Inserts may be mildly magnetic. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.
Inserts with a thin wall are often used in small holes or near the edge of a workpiece.
Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.
Inserts | Installation Tools | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | For Tap Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | Specifications Met | Each | Each | ||
18-8 Stainless Steel with Thick Wall | ||||||||||
| 3/4"-10 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1.067" | 4 | MS51831-109 | 000000000 | 000000 | 000000000 | 0000000 |
| 3/4"-16 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1.067" | 4 | MS51831-209 | 000000000 | 00000 | 000000000 | 000000 |
18-8 Stainless Steel Key-Locking Inserts
Made of stainless steel, these inserts have good corrosion resistance. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. Inserts may be mildly magnetic. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.
Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.
Inserts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Each | Installation Tools | |||||||||
| Thread Size | For Tap Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | 1-9 | 10-Up | Each | ||
18-8 Stainless Steel with Thick Wall | ||||||||||
| 3/4"-10 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1.063" | 4 | 000000000 | 000000 | 000000 | 000000000 | 000000 |
| 3/4"-16 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1.063" | 4 | 000000000 | 00000 | 00000 | 000000000 | 00000 |
Black-Phosphate Steel Key-Locking Inserts
A black-phosphate finish provides mild corrosion resistance. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.
Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole with stripped threads.
Inserts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Each | Installation Tools | |||||||||
| Thread Size | For Tap Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | 1-9 | 10-Up | Each | ||
Black-Phosphate Steel with Thick Wall | ||||||||||
| 3/4"-10 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1 1/16" | 4 | 000000000 | 000000 | 000000 | 000000000 | 000000 |
| 3/4"-16 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1 1/16" | 4 | 000000000 | 00000 | 00000 | 000000000 | 00000 |
| 1 1/8"-12 | 1 1/2"-12 | 1 5/8" | 1 7/16" | 1 7/16" | 4 | 000000000 | 00000 | 00000 | 000000000 | 000000 |
Mil. Spec. Alloy Steel Key-Locking Inserts
The strongest key-locking inserts we offer, these inserts are made to stringent military specifications. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. Inserts may be mildly magnetic. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.
Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.
Inserts | Installation Tools | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | For Tap Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | Specifications Met | Each | Each | ||
Cadmium-Plated Alloy Steel with Thick Wall | ||||||||||
| 3/4"-10 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1.062" | 4 | MS51831A109 | 000000000 | 000000 | 000000000 | 0000000 |
| 3/4"-16 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1.062" | 4 | MS51831A209 | 000000000 | 00000 | 000000000 | 000000 |
Key-Locking Insert Assortments with Installation Tool
These assortments include various sizes of key-locking inserts with thick and thin walls, and an installation tool. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or convert threads in soft metals such as aluminum. They’re comparable to Keensert® inserts.
18-8 stainless steel inserts are more corrosion resistant than black-phosphate steel. They may be mildly magnetic.
Black-phosphate steel inserts are mildly corrosion resistant.
Choose assortments with thick-wall inserts for greater strength than thin-wall inserts, or to fill a large hole.
For Tap | ||||||
|---|---|---|---|---|---|---|
| Includes | No. of Inserts Included | Thread Size | Drill Bit Size | For Max. Hole Dia. | Each | |
Inch | ||||||
18-8 Stainless Steel with Thick Wall | ||||||
| 1/4"-20 Thread × 3/8" Installed Lg. (20 Each) 5/16"-18 Thread × 0.438" Installed Lg. (15 Each) 3/8"-16 Thread × 1/2" Installed Lg. (10 Each) 7/16"-14 Thread × 5/8" Installed Lg. (10 Each) 1/2"-13 Thread × 5/8" Installed Lg. (6 Each) 9/16"-12 Thread × 0.813" Installed Lg. (5 Each) 5/8"-11 Thread × 7/8" Installed Lg. (3 Each) 3/4"-10 Thread × 1 1/8" Installed Lg. (3 Each) 7/8"-9 Thread × 1 1/4" Installed Lg. (3 Each) 1"-8 Thread × 1 3/8" Installed Lg. (2 Each) Installation Tool | 77 | 7/16"-14 1/2"-13 9/16"-12 5/8"-11 3/4"-16 7/8"-14 1 1/8"-12 1 1/4"-12 1 3/8"-12 | X 29/64" 33/64" 37/64" 45/64" 53/64" 1 1/16" 1 3/16" 1 5/16" | 0.397" 29/64" 33/64" 37/64" 45/64" 53/64" 1 1/16" 1 3/16" 1 5/16" | 000000000 | 0000000 |
| 1/4"-28 Thread × 3/8" Installed Lg. (20 Each) 5/16"-24 Thread × 0.438" Installed Lg. (15 Each) 3/8"-24 Thread × 1/2" Installed Lg. (10 Each) 7/16"-20 Thread × 5/8" Installed Lg. (10 Each) 1/2"-20 Thread × 5/8" Installed Lg. (6 Each) 9/16"-18 Thread × 0.813" Installed Lg. (5 Each) 5/8"-18 Thread × 7/8" Installed Lg. (3 Each) 3/4"-16 Thread × 1 1/8" Installed Lg. (3 Each) 7/8"-14 Thread × 1 1/4" Installed Lg. (3 Each) 1"-12 Thread × 1 3/8" Installed Lg. (2 Each) Installation Tool | 77 | 7/16"-14 1/2"-13 9/16"-12 5/8"-11 3/4"-16 7/8"-14 1 1/8"-12 1 1/4"-12 1 3/8"-12 | X 29/64" 33/64" 37/64" 45/64" 53/64" 1 1/16" 1 3/16" 1 5/16" | 0.397" 29/64" 33/64" 37/64" 45/64" 53/64" 1 1/16" 1 3/16" 1 5/16" | 000000000 | 000000 |
Black-Phosphate Steel with Thick Wall | ||||||
| 1/4"-20 Thread × 3/8" Installed Lg. (20 Each) 5/16"-18 Thread × 0.438" Installed Lg. (15 Each) 3/8"-16 Thread × 1/2" Installed Lg. (10 Each) 7/16"-14 Thread × 5/8" Installed Lg. (10 Each) 1/2"-13 Thread × 5/8" Installed Lg. (6 Each) 9/16"-12 Thread × 0.813" Installed Lg. (5 Each) 5/8"-11 Thread × 7/8" Installed Lg. (3 Each) 3/4"-10 Thread × 1 1/8" Installed Lg. (3 Each) 7/8"-9 Thread × 1 1/4" Installed Lg. (3 Each) 1"-8 Thread × 1 3/8" Installed Lg. (2 Each) Installation Tool | 77 | 7/16"-14 1/2"-13 9/16"-12 5/8"-11 3/4"-16 7/8"-14 1 1/8"-12 1 1/4"-12 1 3/8"-12 | X 29/64" 33/64" 37/64" 45/64" 53/64" 1 1/16" 1 3/16" 1 5/16" | 0.397" 29/64" 33/64" 37/64" 45/64" 53/64" 1 1/16" 1 3/16" 1 5/16" | 000000000 | 000000 |
| 1/4"-28 Thread × 3/8" Installed Lg. (20 Each) 5/16"-24 Thread × 0.438" Installed Lg. (15 Each) 3/8"-24 Thread × 1/2" Installed Lg. (10 Each) 7/16"-20 Thread × 5/8" Installed Lg. (10 Each) 1/2"-20 Thread × 5/8" Installed Lg. (6 Each) 9/16"-18 Thread × 0.813" Installed Lg. (5 Each) 5/8"-18 Thread × 7/8" Installed Lg. (3 Each) 3/4"-16 Thread × 1 1/8" Installed Lg. (3 Each) 7/8"-14 Thread × 1 1/4" Installed Lg. (3 Each) 1"-12 Thread × 1 3/8" Installed Lg. (2 Each) Installation Tool | 77 | 7/16"-14 1/2"-13 9/16"-12 5/8"-11 3/4"-16 7/8"-14 1 1/8"-12 1 1/4"-12 1 3/8"-12 | X 29/64" 33/64" 37/64" 45/64" 53/64" 1 1/16" 1 3/16" 1 5/16" | 0.397" 29/64" 33/64" 37/64" 45/64" 53/64" 1 1/16" 1 3/16" 1 5/16" | 000000000 | 000000 |
Screw-Locking Key-Locking Inserts
Forming the strongest hold of any of our threaded inserts, these inserts have a distorted internal thread to lock screws into place and keys that drive into surrounding material to prevent slipping and rotating. This creates a mechanical lock, which is stronger than the chemical lock from adhesive on thread-locking inserts. Because they’re made of a solid piece of metal, these inserts are also stronger than helical inserts, which are made of coiled wire. They're often used in molds, tools and dies, and suspension systems in vehicles to create completely new threads, add strong threads in soft metal, or replace existing threads that are damaged or need to be resized.
A dry-film lubricant makes it easy to install them and screw fasteners in. To install, use a tap to create the threads in your material and an installation tool to drive the keys into the material. All are made to tight tolerances with strictly controlled materials. Many inch sizes also meet military or aerospace standards for dimensions and material.
These inserts resist corrosion in wet environments. Cadmium-plated steel inserts are stronger than 18-8 stainless steel inserts.
Inserts with thick walls are most commonly used; they’re stronger than thin-wall inserts and are used in larger holes.
Inserts | Installation Tools | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | For Tap Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | Specifications Met | Each | Each | ||
18-8 Stainless Steel with Thick Wall | ||||||||||
| 3/4"-10 | 1 1/8"-12 | 1 1/4" | 1 1/16" | 1 1/16" | 4 | MS51831-109L | 000000000 | 000000 | 000000000 | 0000000 |
Cadmium-Plated Steel with Thick Wall | ||||||||||
| 3/4"-10 | 1 1/8"-12 | 1 1/4" | 1 1/16" | 1 1/16" | 4 | MS51831A109L | 000000000 | 00000 | 000000000 | 000000 |
Key-Locking Inserts with Installation Tool
Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. These inserts are used to repair or convert threads in soft metals such as aluminum. They’re comparable to Keensert® inserts.
18-8 stainless steel inserts are more corrosion resistant than black-phosphate steel. They may be mildly magnetic.
Black-phosphate steel inserts are mildly corrosion resistant.
Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.
| Thread Size | For Tap Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | No. of Inserts Included | Each | |
18-8 Stainless Steel with Thick Wall | ||||||||
|---|---|---|---|---|---|---|---|---|
| 3/4"-10 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1 1/16" | 4 | 3 | 000000000 | 000000 |
| 3/4"-16 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1 1/16" | 4 | 3 | 000000000 | 00000 |
Black-Phosphate Steel with Thick Wall | ||||||||
| 3/4"-10 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1 1/16" | 4 | 3 | 000000000 | 00000 |
| 3/4"-16 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1 1/16" | 4 | 3 | 000000000 | 00000 |
18-8 Stainless Steel Key-Locking Insert Blanks
Tap the thread size you need into the solid body of these blanks. They’re a great choice when you need a custom combination of internal thread size and external diameter. Use them to repair or add new threads in soft metals, such as aluminum. They can also plug threaded holes without the hassle of welding. Made of 18-8 stainless steel, these insert blanks resist corrosion from mild chemicals and water. They have keys that grip the surrounding material, making them more secure than thread-locking inserts.
To install, you’ll need a drill bit, tap, installation tool, and hammer.
Steel Key-Locking Insert Blanks
Tap the thread size you need into the solid body of these blanks. They’re a great choice when you need a custom combination of internal thread size and external diameter. Use them to repair or add new threads in soft metals, such as aluminum. They can also plug threaded holes without the hassle of welding. Made of steel, they’re stronger than stainless steel insert blanks. A black-phosphate coating makes them mildly corrosion resistant. These insert blanks have keys that grip the surrounding material, making them more secure than thread-locking inserts.
To install, you’ll need a drill bit, tap, installation tool, and hammer.