High-Performance Key Locking Inserts

Key locking thread insert is a kind of special fastener with threads inside and outside, and four or two pin keys on the outer threads. The pin screw set is inserted into the tapped bottom hole, and then the four pins are pressed in to provide a strong fastening effect.

product details

Core Features

✅ Anti-Vibration Design:

Locking keys provide 360° thread engagement

Withstand over 1,000,000 vibration cycles

✅ Heavy-Duty Applications:

Ideal for high-stress environments (e.g., construction, mining, energy)

Compatible with steel, cast iron, and aluminum substrates

✅ Easy Installation:

No special tools required for standard installations

Tangless design eliminates break-off steps

Technical Specifications Table

Parameter	Specification
Material	303/Carbon steel
Thread Standard	Metric (M4-M24) UNC/UNF (#6-1")
Locking Key Type	2 or 4 keys
Installation Torque	2.0-15.0 N·m (size dependent)
Temperature Range	-50°C to +650°C
Certifications	ISO 9001, DIN 8140, RoHS

Why Choose Key Lock Inserts?

✅ Superior Load Distribution:

Locking keys increase thread contact area by 40%

Prevent thread stripping under high torque

✅ Vibration Resistance:

Passed 1M+ cycles on SAE J123 test bench

Ideal for heavy machinery and off-road vehicles

✅ Corrosion Protection:

303/316 stainless steel options for harsh environments

Salt spray resistance >1000h

Key locking Thread Insert Parameters

Metric size -Thin wall key locking thread insert
Internal Thread	External Thread	Length (mm)	Tap Drill (mm)	Thread Tap (mm)	Tap Depth (mm)	Removal Dril (mm)	Removal Depth (mm)
M5×0.8	M8×1.25	8.0	6.9	M8×1.25	9.5	5.50	4.00
M6×1.0	M10×1.25	10.0	8.8	M10×1.25	11.5	7.50	4.75
M8×1.25	M12×1.25	12.0	10.8	M12×1.25	13.5	9.50	4.75
M8×1.0	M12×1.25	12.0	10.8	M12×1.25	13.5	9.50	4.75
M10×1.5	M14×1.5	14.0	12.8	M14×1.5	15.5	11.50	4.75
M10×1.25	M14×1.5	14.0	12.8	M14×1.5	15.5	11.50	4.75
M12×1.75	M16×1.5	16.0	14.75	M16×1.5	17.5	13.50	4.75
M12×1.25	M16×1.5	16.0	14.75	M16×1.5	17.5	13.50	4.75

Metric size -Heavy duty key locking thread insert
Internal Thread	External Thread	Length (mm)	Tap Drill (mm)	Thread Tap (mm)	Tap Depth (mm)	Removal Dril (mm)	Removal Depth (mm)
M4×0.7	M8×1.25	8.0	6.9	M8×1.25	9.5	5.50	4.00
M5×0.8	M10×1.25	10.0	8.8	M10×1.25	12.5	7.50	4.75
M6×1.0	M12×1.25	12.0	10.8	M12×1.25	14.5	9.50	4.75
M8×1.25	M14×1.5	14.0	12.8	M14×1.5	16.5	11.50	4.75
M8×1.0	M14×1.5	14.0	12.8	M14×1.5	16.5	11.50	4.75
M10×1.5	M16×1.5	16.0	14.75	M16×1.5	18.5	13.50	4.75
M10×1.25	M16×1.5	16.0	14.75	M16×1.5	18.5	13.50	4.75
M12×1.75	M18×1.5	18.0	16.75	M18×1.5	20.5	15.50	4.75
M12×1.25	M18×1.5	18.0	16.75	M18×1.5	20.5	15.50	4.75
M14×2.0	M20×1.5	20.0	18.75	M20×1.5	22.5	17.50	4.75
M14×1.5	M20×1.5	20.0	18.75	M20×1.5	22.5	17.50	4.75
M16×2.0	M22×1.5	22.0	20.5	M22×1.5	24.5	17.75	6.35
M16×1.5	M22×1.5	22.0	20.5	M22×1.5	24.5	17.75	6.35
M18×1.5	M24×1.5	24.0	22.5	M24×1.5	26.5	19.75	6.35
M20×2.5	M30×2.0	30.0	28.0	M30×2.0	34.5	25.75	6.35
M20×1.5	M30×2.0	30.0	28.0	M30×2.0	34.5	25.75	6.35
M22×1.5	M32×2.0	32.0	30.0	M32×2.0	36.5	27.75	6.35
M24×3.0	M33×2.0	33.0	31.0	M33×2.0	37.5	28.75	6.35
M24×2.0	M33×2.0	33.0	31.0	M33×2.0	37.5	28.75	6.35