Category: Threaded Inserts

Thread Repair Inserts are designed to rapidly repair stripped threads in a wide range of materials, eliminating re-machining for hole relocation and to increase thread strength in lighter weight materials.
Other ancillary products available are - Threaded Inserts, Thread Inserts, Bolster Inserts, Keylocking Inserts, Thread Repair Parts, Thread Fastening, Coil Thread Repairs, Plastic Fastenings, Nimonic Inserts, Stainless Steel Inserts and many others.
Please contact us if you require any more information.
General Information
Here is some general information regarding Keylocking Threaded Inserts. They are designed to quickly repair stripped, damaged or worn out threads.
Installation and Removal Guide
This is a guide to the method for installing and removing Keylocking Threaded Inserts.
Industrial Style - Thinwall and Heavy Duty
- Material: Carbon Steel Inserts - C1215 or equivalent, Stainless Steel - 303 or equivalent, Keys - 302 CRES or equivalent.
- Finish: Carbon Steel Inserts - Zinc Phosphate. Stainless Steel Inserts - Passivated.
- Tolerances: ±.010 Inch, unless specified otherwise.
- Keys: Inserts with internal thread size of 5/16 and larger have four locking keys. Smaller sizes have two locking keys.
- Tap Drill Hole Tolerence: Inch - .234 to .500 = +.004/-.001, Over .500 = +.005/-.001.
Industrial Style - Extra Heavy Duty
- Material: Carbon Steel Inserts - C1215 or equivalent, Stainless Steel - 303 or equivalent, Keys - 302 CRES or equivalent.
- Finish: Carbon Steel Inserts - Zinc Phosphate. Stainless Steel Inserts - Passivated.
- Tolerances: ±.010 Inch, unless specified otherwise.
- Keys: Inserts with internal thread size of 5/16 and larger have four locking keys. Smaller sizes have two locking keys.
- Tap Drill Hole Tolerence: Inch - .234 to .500 = +.004/-.001, Over .500 = +.005/-.001.
Industrial Style - Metric
- Material: Carbon Steel Inserts - C1215 or equivalent, Stainless Steel - 303 or equivalent, Keys - 302 CRES or equivalent.
- Finish: Carbon Steel Inserts - Zinc Phosphate. Stainless Steel Inserts - Passivated.
- Tolerances: ±.25 mm, unless specified otherwise.
- Keys: Inserts with internal thread size of M7 and larger have four locking keys. Smaller sizes have two locking keys.
- Tap Drill Hole Tolerence: Metric - 6.90 to 10.80 = +.100/-.025, Over 12.80 = +.130/-.025.
Industrial Style - Metric/Inch
Create Metric Holes... with Inch Taps! This unique product allows you to create a Metric Thread utilizing Inch drills and taps. The insert O.D. is Inch sized, the I.D. is Metric.
- Material: Carbon Steel Inserts - C1215 or equivalent, Stainless Steel - 303 or equivalent, Keys - 302 CRES or equivalent.
- Finish: Carbon Steel Inserts - Zinc Phosphate. Stainless Steel Inserts - Passivated.
- Tolerances: ±.010 Inch or ±.025 mm, unless specified otherwise.
- Keys: Inserts with internal thread size of 5/16 or M7 and larger have four locking keys. Smaller sizes have two locking keys.
- Tap Drill Hole Tolerence: Inch - .234 to .500 = +.004/-.001, Over .500 = +.005/-.001. Metric - 6.90 to 10.80 = +.100/-.025, Over 12.80 = +.130/-.025.
Industrial Style (Single Size Kits) - Inch
Single Size Kits contain inserts of one size per box. Each Single Size Kit includes a quantity of inserts shown in the chart, one installation tool and instructions for installation and removal.
Industrial Style (Single Size Kits) - Metric
Single Size Kits contain inserts of one size per box. Each Single Size Kit includes a quantity of inserts shown in the chart, one installation tool and instructions for installation and removal.
Industrial Style (Single Size Kits) - Metric/Inch
Single Size Kits contain inserts of one size per box. Each Single Size Kit includes a quantity of inserts shown in the chart, one installation tool and instructions for installation and removal.
Assortments (Small) - Industrial Style
Each Assortment Kit contains a selection of various size inserts and the proper installation tools. Instructions for installation and removal are also included. Assortment Kits provide convenient storage and easy access to the various inserts and tools.
Assortments (Large) - Industrial Style
Each Assortment Kit contains a selection of various size inserts and the proper installation tools. Instructions for installation and removal are also included. Assortment Kits provide convenient storage and easy access to the various inserts and tools.
Cross Reference - Inch (MS/NAS - 303 CRES)
This is a cross reference guide to MS/NAS Style thread inserts.
Cross Reference - Inch (MS/NAS - A286 CRES)
This is a cross reference guide to MS/NAS style thread inserts.
Cross Reference - Inch (MS/NAS - 4140 CRES)
This is a cross reference guide to MS/NAS style thread inserts.
Cross Reference - Inch (MS/NAS - Metric)
This is a cross reference guide to MS/NAS style thread inserts.
MS/NAS Style - 303 CRES (Miniature)
- Material: Inserts - 303 CRES, Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.010 inches, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Miniature inserts are furnished with two locking keys.
- Material Identification Mark: None.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A (MS51830).
MS/NAS Style - 303 CRES (Lightweight)
- Material: Inserts - 303 CRES, Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.010 inches, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Inserts with internal thread size of 5/16 and larger are furnished with four locking keys. Smaller sizes have two locking keys.
- Material Identification Mark: None.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A (MS51830 & NAS1394).
MS/NAS Style - 303 CRES (Heavy Duty)
- Material: Inserts - 303 CRES, Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.010 inches, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Inserts with internal thread size of 5/16 and larger are furnished with four locking keys. Smaller sizes have two locking keys.
- Material Identification Mark: None.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A (MS51831 & NAS1395).
MS/NAS Style - 303 CRES (Extra Heavy Duty)
- Material: Inserts - 303 CRES, Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.010 inches, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Inserts with internal thread size of 1/4 and larger are furnished with four locking keys. Smaller sizes have two locking keys.
- Material Identification Mark: None.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A (MS51832).
MS/NAS Style - A286 CRES (Miniature)
- Material: Inserts - A286 CRES (140 KSI Min), Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.010 inch, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Miniature inserts are furnished with two locking keys.
- Material Identification Mark: None.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A (MS51830).
MS/NAS Style - A286 CRES (Lightweight)
- Material: Inserts - A286 CRES (140 KSI Min), Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.010 inch, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Inserts with internal thread size of 5/16 and larger are furnished with four locking keys. Smaller sizes have two locking keys.
- Material Identification Mark: One line on top of insert.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A (MS51830 & NAS1394).
MS/NAS Style - A286 CRES (Heavy Duty)
- Material: Inserts - A286 CRES (140 KSI Min), Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.010 inch, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Inserts with internal thread size of 5/16 and larger are furnished with four locking keys. Smaller sizes have two locking keys.
- Material Identification Mark: One line on top of insert.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A (MS51831 & NAS1395).
MS/NAS Style - A286 CRES (Extra Heavy Duty)
- Material: Inserts - A286 CRES (140 KSI Min), Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.010 inch, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Inserts with internal thread size of 1/4 and larger are furnished with four locking keys. Smaller sizes have two locking keys.
- Material Identification Mark: One line on top of insert.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A (MS51832).
MS/NAS Style - 4140 Alloy Steel (Miniature)
- Material: Inserts - 4140 Alloy Steel (160 KSI Min), Keys - 302 CRES.
- Finish: Cadmium Plate (QQ-P-416 Type II, Cl. 2).
- Tolerances: ±.010 inch, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Miniature inserts are furnished with two locking keys.
- Material Identification Mark: None.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A (MS51830).
MS/NAS Style - 4140 Alloy Steel (Lightweight)
- Material: Inserts - 4140 Alloy Steel (160 KSI Min), Keys - 302 CRES.
- Finish: Cadmium Plate (QQ-P-416 Type II, Cl. 2).
- Tolerances: ±.010 inch, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Inserts with internal thread size of 5/16 and larger are furnished with four locking keys. Smaller sizes have two locking keys.
- Material Identification Mark: Two lines on top of insert.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A (MS51830 & NAS1394).
MS/NAS Style - 4140 Alloy Steel (Heavy Duty)
- Material: Inserts - 4140 Alloy Steel (160 KSI Min), Keys - 302 CRES.
- Finish: Cadmium Plate (QQ-P-416 Type II, Cl. 2).
- Tolerances: ±.010 inch, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Inserts with internal thread size of 5/16 and larger are furnished with four locking keys. Smaller sizes have two locking keys.
- Material Identification Mark: Two lines on top of insert.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A (MS51831 & NAS1395).
MS/NAS Style - 4140 Alloy Steel (Extra Heavy Duty)
- Material: Inserts - 4140 Alloy Steel (160 KSI Min), Keys - 302 CRES.
- Finish: Cadmium Plate (QQ-P-416 Type II, Cl. 2).
- Tolerances: ±.010 inch, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Inserts with internal thread size of 1/4 and larger are furnished with four locking keys. Smaller sizes have two locking keys.
- Material Identification Mark: Two lines on top of insert.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A (MS51832).
MS/NAS Style (Metric) - 303 CRES (Miniature)
- Material: Inserts - 303 CRES, Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.25 mm, unless specified otherwise.
- Internal Threads: Per Fed Std H28/21, MJ Form.
- Dimensions: All dimensions below are in millimeters.
- Keys: Miniature inserts are furnished with two locking keys.
- Material Identification Mark: None.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
MS/NAS Style (Metric) - 303 CRES (Lightweight)
- Material: Inserts - 303 CRES, Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.25 mm, unless specified otherwise.
- Internal Threads: Per Fed Std H28/21, MJ Form.
- Dimensions: All dimensions below are in millimeters.
- Keys: Inserts with internal thread size of M6 and smaller are furnished with two locking keys. Larger sizes have four locking keys.
- Material Identification Mark: None.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
MS/NAS Style (Metric) - 303 CRES (Heavy Duty)
- Material: Inserts - 303 CRES, Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.25 mm, unless specified otherwise.
- Internal Threads: Per Fed Std H28/21, MJ Form.
- Dimensions: All dimensions below are in millimeters.
- Keys: Inserts with internal thread size of M6 and smaller are furnished with two locking keys. Larger sizes have four locking keys.
- Material Identification Mark: None.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
MS/NAS Style (Metric) - A286 CRES (Miniature)
- Material: Inserts - A286 CRES (140 KSI Min), Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.25 mm, unless specified otherwise.
- Internal Threads: Per Fed Std H28/21, MJ Form.
- Dimensions: All dimensions below are in millimeters.
- Keys: Miniature inserts are furnished with two locking keys.
- Material Identification Mark: None.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: NA0147.
MS/NAS Style (Metric) - A286 CRES (Lightweight)
- Material: Inserts - A286 CRES (140 KSI Min), Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.25 mm, unless specified otherwise.
- Internal Threads: Per Fed Std H28/21, MJ Form.
- Dimensions: All dimensions below are in millimeters.
- Keys: Inserts with internal thread size of M6 and smaller have two locking keys. Larger sizes have four locking keys.
- Material Identification Mark: One line on top of insert.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: NA0149.
MS/NAS Style (Metric) - A286 CRES (Heavy Duty)
- Material: Inserts - A286 CRES (140 KSI Min), Keys - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.25 mm, unless specified otherwise.
- Internal Threads: Per Fed Std H28/21, MJ Form.
- Dimensions: All dimensions below are in millimeters.
- Keys: Inserts with internal thread size of M6 and smaller have two locking keys. Larger sizes have four locking keys.
- Material Identification Mark: One line on top of insert.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: NA0151.
MS/NAS Style (Metric) - 4140 Alloy Steel (Miniature)
- Material: Inserts - 4140 Alloy Steel (160 KSI Min), Keys - 302 CRES.
- Finish: Cadmium Plate (QQ-P-416 Type II, Cl. 2).
- Tolerances: ±.25 mm, unless specified otherwise.
- Internal Threads: Per Fed Std H28/21, MJ Form.
- Dimensions: All dimensions below are in millimeters.
- Keys: Miniature Inserts are furnished with two locking keys.
- Material Identification Mark: None.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: NA0146.
MS/NAS Style (Metric) - 4140 Alloy Steel (Lightweight)
- Material: Inserts - 4140 Alloy Steel (160 KSI Min), Keys - 302 CRES.
- Finish: Cadmium Plate (QQ-P-416 Type II, Cl. 2).
- Tolerances: ±.25 mm, unless specified otherwise.
- Internal Threads: Per Fed Std H28/21, MJ Form.
- Dimensions: All dimensions below are in millimeters.
- Keys: Inserts with internal thread size of M6 and smaller have two locking keys. Larger sizes have four locking keys.
- Material Identification Mark: Two lines on top of insert.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: NA0148.
MS/NAS Style (Metric) - 4140 Alloy Steel (Heavy Duty)
- Material: Inserts - 4140 Alloy Steel (160 KSI Min), Keys - 302 CRES.
- Finish: Cadmium Plate (QQ-P-416 Type II, Cl. 2).
- Tolerances: ±.25 mm, unless specified otherwise.
- Internal Threads: Per Fed Std H28/21, MJ Form.
- Dimensions: All dimensions below are in millimeters.
- Keys: Inserts with internal thread size of M6 and smaller have two locking keys. Larger sizes have four locking keys.
- Material Identification Mark: Two lines on top of insert.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: NA0150.
Specific Use - Blind End (Miniature and Lightweight)
- Material: Inserts - 303 CRES, Keys and Retaining Ring - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.010 inch, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Inserts with internal thread size of 5/16 and larger have four locking keys. Smaller sizes have two locking keys.
- Material Identification: None.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A.
Specific Use - Blind End (Heavy Duty)
- Material: Inserts - 303 CRES, Keys and Retaining Ring - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.010 inch, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Inserts with internal thread size of 5/16 and larger have four locking keys. Smaller sizes have two locking keys.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
- Performance: MIL-I-45914A.
Specific Use - Floating
Miniature -
- Material: Inserts - 303 CRES, Keys and Retaining Ring - 302 CRES.
- Finish: Passivated.
- Tolerances: ±.010 inch, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Miniature inserts are furnished with two locking keys.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
Heavy Duty -
- Material: Inserts - 4140 Alloy Steel (160 KSI Min), Keys and Retaining Ring - 302 CRES.
- Finish: Cadmium Plate (QQ-P-416 Type II, Cl. 2).
- Tolerances: ±.010 inch, unless specified otherwise.
- Internal Threads: Per SAE AS8879.
- Dimensions: All dimensions below are in inches.
- Keys: Inserts with internal thread size of 5/16 and larger have four locking keys. Smaller sizes have two locking keys.
- Material Identification Mark: Two lines on top of insert.
- Lubrication: Dry Film Lube on Self-Locking inserts only.
Specific Use - Solid
- Material: Carbon Steel - C1215 or equivalent, Stainless Steel - 303 CRES or equivalent, Keys - 302 CRES or equivalent.
- Finish: Carbon Steel - Zinc Phosphate. Stainless Steel - Passivated.
- Tolerances: ±.010 inch or ±.025 mm, unless specified otherwise.
- Dimensions: Are in inches except metric inserts are in millimeters.
- Keys: Inserts with external thread size of 7/16 or M12 and larger have four locking keys. Smaller sizes have two locking keys.
- Material Identification Mark: None.
Specific Use - Cast-In
- Material: Stainless - 303 or equivalent, Brass - 360 or equivalent.
- Finish: Stainless Steel - Passivated. Brass - None.
- Dimensions: Are in inches except metric inserts are in millimeters.
- Tolerances: ±.005 inch or ±.13 mm, unless specified otherwise.
- material Identification Mark: None.
- Lubrication: None.
Bolster Plate Bushings
- Material: Stressproof
- Finish: Black Oxide
- Internal Thread: 2B-UNC
- External Thread: 2A-UNF
Repairs are made quickly, easily, and right on the machine. Re-tap bolster plate hole, insert the threaded bushing to match, use a locking type sealant to lock the bushing in place. The Bolster Plate Bushings can also be used as threaded bushings in cast iron machine bases where greater thread strength is necessary. Eliminates the problems of "pulled-out" cast iron threads, reduces the need for bulky threaded cast iron sections.
Quick Acting Inserts
Heat treated steel. Black oxide finish. Easily installed in fixture by simply drilling and tapping hole at required location. For quick action tilt screw and it will slide in or out. Straighten screw and threads engage for clamping. See clamp assemblies above for use with these quick acting inserts.