Key-locking Insert

A high-strength thread reinforcement component, typically made of precision-machined stainless steel or carbon steel. It features internal and external threads, with one end or a specific section designed with one or more “key” or “tab” protrusions. Thanks to its strong reinforcement and locking effect, it is widely used in aerospace, automotive, mold making, machinery, electronics, and medical equipment—especially in applications requiring frequent disassembly, high vibration resistance, or heavy load capacity.

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Product Specifications

Common metric specifications

Category	Model	SpecificatIinotne nal	Thread(6HE)xternal	External thread	lengthDrill
Micro	M2	M2*1.4	M4*0.7	3	3.4
	M2.5	M2.5*0.45	M4.5*0.75	3.8	3.9
	M3	M3*0.5	M5*0.8	4.2	4.4
	M4	M4*0.7	M6*0.75	5.2	5.5
Light	M5	M5*0.8	M8*1.25	8	6.9
	M6	M6*1	M10*1.25	10	8.8
	M8	M8*1.25	M12*1.25	12	10.8
	M10	M10*1.5	M14*1.5	14	12.8
	M12	M12*1.75	M16*1.5	16	14.8
Heavy	M4	M4*0.7	M8*1.25	8	6.9
	M5	M5*0.8	M10*1.25	10	8.8
	M6	M6*1	M12*1.25	12	10.8
	M8	M8*1.25	M14*1.5	14	12.8
	M10	M10*1.5	M16*1.5	16	14.8
	M12	M12*1.75	M18*1.5	18	16.8

Common American Standard(UNFPA/UNC)specifications

Category	Model specifications	Internal thread(2B)	External thread (2A)	Total length	Drill
Micro	2-56	2-56	8-32	0.12	0.134
	4-40	4-40	10-32	0.17	0.161
	6-32	6-32	12-28	0.17	0.187
	8-32	8-32	1/4-28	0.22	0.228
Light	10-32(10-24)	10-32(10-24)	5/16-18	0.31	0.272
	1/4-20(1/4-28)	1/4-20(1/4-28)	3/8-16	0.37	0.332
	5/16-18(5/16-24)	5/16-18(5/16-24)	7/16-14	0.43	0.397
	3/8-16(3/8-24)	3/8-16(3/8-24)	1/2-13	0.50	0.453
	7/16-20(7/16-14)	7/16-20(7/16-14)	9/16-12	0.56	0.516
	1/2-13(1/2-20)	1/2-13(1/2-20)	5/8-11	0.62	0.578
Heavy	8-32	8-32	5/16-18	0.31	0.272
	10-32(10-24)	10-32(10-24)	3/8-16	0.31	0.332
	1/4-20(1/4-28)	1/4-20(1/4-28)	7/16-14	0.37	0.397
	5/16-24(5/16-18)	5/16-24(5/16-18)	1/2-13	0.43	0.453
	3/8-16(3/8-24)	3/8-16(3/8-24)	9/16-12	0.50	0.516
	1/2-13(1/2-20)	1/2-13(1/2-20)	3/4-16	0.62	0.70

Company Profile

Dongtai Jinzhize Metal Products Co., Ltd.

As Key-locking Insert Manufacturer and Key-locking Insert Factory, Dongtai Jinzhize Metal Products Co., Ltd. is a specialized manufacturing facility dedicated to threaded connection products for the automotive and aerospace sectors. We primarily produce Helical Wire Inserts, Self-Tapping Inserts, Key Locking Inserts, Threaded Adapters, Oil Plugs, as well as matching installation taps and tools. Established in 2015, the company operates from a 10,000-square-meter-owned manufacturing plant equipped with hundreds of machine tools and automated production systems. Through years of development, we have built an experienced team of design, development, and production specialists, complemented by a rigorous quality management system and comprehensive after-sales service mechanism. Our products are widely utilized in the automotive industry (including engines and transmissions for both passenger and commercial vehicles), the aerospace industry, and rail vehicle manufacturing. With an annual output value of 153 million RMB in 2024, we possess the capability for a large-scale, stable supply. We are committed to providing customers with highly consistent, traceable products and reliable service support.

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