How to choose the appropriate dimensions of a locking helical insert?

The helical insert length should be equal to the desired fastener diameter. If the application permits users to modify the installation hole, they should remember that inserts with longer lengths have greater pullout capacity (harder to pull out). The exact insert length may also vary based on the base material. Hard materials like steel do not need long inserts. On the other hand, for soft materials like aluminium, a longer insert is preferred. In contrast, inserts having wide diameters have superior overall torque-out capacity (harder to rotate inside the hole).

How to install a locking helical insert?

Drill out an appropriately sized hole in the material or remove damaged threading from an already prepared hole.Use a tap to thread / rethread the hole in the material.Select an insert and use the installation tool to wind the insert into the hole.Use a tang break-off rod or punch to remove the tang / prong and allow free passage of the fastener. Large-sized holes or spark plug inserts require long nose pliers to bend the tang in & out alternately until the tang breaks free.Fasteners can now be installed into the insert.

How to install a key-locking thread insert?

Drill a hole according to the required application. Tap the drilled hole and wind the insert into the hole. Drive the key into the material using the installation tool & / or hammer.

Can locking helical inserts be removed after installation?

Yes, some inserts can be removed using removal tools that unwind them in the direction opposite to that used during installation. Key locking inserts or rock solid inserts can be removed by bending the locking keys out of the material and using a winding tool to remove the insert out of the base material. Users should note that locking helical inserts can be reused after removal but key locking inserts cannot be reused. Locking helical inserts allow assembly & disassembly of fasteners multiple times.

Home
Fasteners
Thread Insert
Locking Helical Inserts

Locking Helical Inserts

Filter

CHRISLYNN -

#8-32 Grade 303 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Thread Size	Material
A	77286	0.22"	#1	#8-32	Stainless Steel	RFQ
B	77332	5/16"	Q	#8-32	Stainless Steel	RFQ
A	77300	5/16"	I	#8-32	Stainless Steel	RFQ

CHRISLYNN -

1/4"-20 Grade 303 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Thread Size	Material
A	77322	0.37"	Q	1/4"-20	Stainless Steel	RFQ
B	77334	3/8"	29/64"	1/4"-20	Stainless Steel	RFQ
A	77302	3/8"	X	1/4"-20	Stainless Steel	RFQ

CHRISLYNN -

#4-48 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Thread Size	Material	Pkg. Qty.
A	84505	0.112"	#31	#4-48	Stainless Steel	100	RFQ
A	84605	0.168"	#31	#4-48	Stainless Steel	100	RFQ
A	84705	0.224"	#31	#4-48	Stainless Steel	100	RFQ
A	84905	0.336"	#31	#4-48	Stainless Steel	100	RFQ
A	84805	7/25"	#31	#4-48	Stainless Steel	100	RFQ

CHRISLYNN -

5/16"-18 Grade 303 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Thread Size	Material
A	77323	0.43"	X	5/16"-18	Stainless Steel	RFQ
B	77335	0.437"	33/64"	5/16"-18	Stainless Steel	RFQ
A	77303	0.437"	29/64"	5/16"-18	Stainless Steel	RFQ

1 1/4"-12 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Free Coil Dia.	Thread Type	Thread Direction	Hardness	Tensile Strength	Price	Pkg. Qty.
A	A3591-20CN1250	1 1/4"	1 17/64"	1.454"	Fine	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€2,417.67	100
B	84541	1 1/4"	1 9/32"	-	-	-	-	-	-	5	RFQ
A	A3591-20CN1875	1 7/8"	1 17/64"	1.454"	Fine	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€2,957.65	100
B	84641	1 7/8"	1 9/32"	-	-	-	-	-	-	5	RFQ
B	84741	2 1/2"	1 9/32"	-	-	-	-	-	-	5	RFQ
B	84841	3 1/8"	1 9/32"	-	-	-	-	-	-	5	RFQ
B	84941	3 3/4"	1 9/32"	-	-	-	-	-	-	5	RFQ

M3 x 0.5 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Free Coil Dia.	Thread Type	Drill Size	Tensile Strength	Finish	Thread Direction	Hardness	Price	Pkg. Qty.
A	4184-2.5CNW025S	2.5 mm	3.45 mm	Metric Coarse	2.55 mm	200000 psi to 250000 psi	Dry Film Lubricant	Right Hand	Rockwell C43-C50	€1,978.77	1
A	4184-2.5CN025S	2.5 mm	3.45 mm	Metric Coarse	2.55 mm	200000 psi to 250000 psi	-	Right Hand	Rockwell C43-C50	€1,943.47	1
A	4184-3CN030S	3 mm	4.075 mm	Metric Coarse	1/8"	200000 psi to 250000 psi	-	Right Hand	Rockwell C43-C50	€1,485.90	1
A	A4184-3CN030	3 mm	4.075 mm	Metric Coarse	3.15 mm	200000 psi to 250000 psi	-	Right Hand	Rockwell C43-C50	€120.08	100
B	84553	3 mm	-	-	1/8"	-	-	-	-	-	100	RFQ
A	4184-3CNW030S	3 mm	4.075 mm	Metric Coarse	1/8"	200000 psi to 250000 psi	Dry Film Lubricant	Right Hand	Rockwell C43-C50	€1,462.47	1
A	4184-3.5CNW035S	3.5 mm	4.675 mm	Metric Coarse	3.7 mm	200000 psi to 250000 psi	Dry Film Lubricant	Right Hand	Rockwell C43-C50	€1,220.96	1
A	4184-2.5CNW038S	3.8 mm	3.45 mm	Metric Coarse	2.55 mm	200000 psi to 250000 psi	Dry Film Lubricant	Right Hand	Rockwell C43-C50	€1,692.38	1
A	4184-2.5CN038S	3.8 mm	3.45 mm	Metric Coarse	2.55 mm	200000 psi to 250000 psi	-	Right Hand	Rockwell C43-C50	€1,242.35	1
A	4184-3CN045S	4.5 mm	4.075 mm	Metric Coarse	1/8"	200000 psi to 250000 psi	-	Right Hand	Rockwell C43-C50	€1,531.52	1
A	A4184-3CN045	4.5 mm	4.075 mm	Metric Coarse	3.15 mm	200000 psi to 250000 psi	-	Right Hand	Rockwell C43-C50	€127.16	100
A	4184-3CNW045S	4.5 mm	4.075 mm	Metric Coarse	1/8"	200000 psi to 250000 psi	Dry Film Lubricant	Right Hand	Rockwell C43-C50	€1,692.38	1
B	84653	4.5 mm	-	-	1/8"	-	-	-	-	-	100	RFQ
A	4184-2.5CN050S	5 mm	3.45 mm	Metric Coarse	2.55 mm	200000 psi to 250000 psi	-	Right Hand	Rockwell C43-C50	€1,305.01	1
A	4184-2.5CNW050S	5 mm	3.45 mm	Metric Coarse	2.55 mm	200000 psi to 250000 psi	Dry Film Lubricant	Right Hand	Rockwell C43-C50	€1,952.36	1000
A	4184-3.5CNW053S	5.3 mm	4.675 mm	Metric Coarse	3.7 mm	200000 psi to 250000 psi	Dry Film Lubricant	Right Hand	Rockwell C43-C50	€1,218.60	1
A	4184-3CN060S	6 mm	4.075 mm	Metric Coarse	1/8"	200000 psi to 250000 psi	-	Right Hand	Rockwell C43-C50	€1,609.22	1
A	A4184-3CN060	6 mm	4.075 mm	Metric Coarse	3.15 mm	200000 psi to 250000 psi	-	Right Hand	Rockwell C43-C50	€148.62	100
B	84753	6 mm	-	-	1/8"	-	-	-	-	-	100	RFQ
A	4184-3CNW060S	6 mm	4.075 mm	Metric Coarse	1/8"	200000 psi to 250000 psi	Dry Film Lubricant	Right Hand	Rockwell C43-C50	€1,770.70	1
A	4184-3.5CNW070S	7 mm	4.953 mm	Coarse	3.7 mm	200000.0 psi to 250000.0 psi	Dry Film Lubricant	Right Hand	Rockwell C43-C50	€1,832.08	1000
B	84853	7.5 mm	-	-	1/8"	-	-	-	-	-	100	RFQ
A	A4184-3CN075	7.5 mm	4.075 mm	Metric Coarse	3.15 mm	200000 psi to 250000 psi	-	Right Hand	Rockwell C43-C50	€158.09	100
B	84953	9 mm	-	-	1/8"	-	-	-	-	-	100	RFQ
A	A4184-3CN090	9 mm	4.075 mm	Metric Coarse	3.15 mm	200000 psi to 250000 psi	-	Right Hand	Rockwell C43-C50	€171.70	100

CHRISLYNN -

M22 x 1.5 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Thread Size	Material	Pkg. Qty.
A	84582	22 mm	57/64"	M22 x 1.5	Stainless Steel	15	RFQ
A	84682	33 mm	57/64"	M22 x 1.5	Stainless Steel	15	RFQ
A	84782	44 mm	57/64"	M22 x 1.5	Stainless Steel	15	RFQ
A	84882	55 mm	57/64"	M22 x 1.5	Stainless Steel	15	RFQ
A	84982	66 mm	57/64"	M22 x 1.5	Stainless Steel	15	RFQ

CHRISLYNN -

M2.2 x 0.45 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Thread Size	Material	Pkg. Qty.
A	84551	2.2 mm	#42	M2.2 x 0.45	Stainless Steel	100	RFQ
A	84651	3.3 mm	#42	M2.2 x 0.45	Stainless Steel	100	RFQ
A	84751	4.4 mm	#42	M2.2 x 0.45	Stainless Steel	100	RFQ
A	84851	5.5 mm	#42	M2.2 x 0.45	Stainless Steel	100	RFQ
A	84951	6.6 mm	#42	M2.2 x 0.45	Stainless Steel	100	RFQ

CHRISLYNN -

#5-40 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Thread Size	Material	Pkg. Qty.
A	84706	1/4"	#29	#5-40	Stainless Steel	100	RFQ
A	84506	1/8"	#29	#5-40	Stainless Steel	100	RFQ
A	84906	3/8"	#29	#5-40	Stainless Steel	100	RFQ
A	84606	3/16"	#29	#5-40	Stainless Steel	100	RFQ
A	84806	5/16"	#29	#5-40	Stainless Steel	100	RFQ

CHRISLYNN -

M9 x 1 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Thread Size	Material	Pkg. Qty.
A	84561	9 mm	3/8"	M9 x 1	Stainless Steel	100	RFQ
A	84661	13.5 mm	3/8"	M9 x 1	Stainless Steel	100	RFQ
A	84761	18 mm	3/8"	M9 x 1	Stainless Steel	100	RFQ
A	84861	22.5 mm	3/8"	M9 x 1	Stainless Steel	100	RFQ
A	84961	27 mm	3/8"	M9 x 1	Stainless Steel	100	RFQ

CHRISLYNN -

M24 x 3 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Thread Size	Material	Pkg. Qty.
A	84587	24 mm	31/32"	M24 x 3	Stainless Steel	15	RFQ
A	84687	36 mm	31/32"	M24 x 3	Stainless Steel	15	RFQ
A	84787	48 mm	31/32"	M24 x 3	Stainless Steel	15	RFQ
A	84887	60 mm	31/32"	M24 x 3	Stainless Steel	15	RFQ
A	84987	72 mm	31/32"	M24 x 3	Stainless Steel	15	RFQ

HELICOIL -

M3.5 x 0.5 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Free Coil Dia.	Finish	Thread Type	Drill Size	Thread Direction	Hardness	Tensile Strength	Price	Pkg. Qty.
A	A4184-3.5CNW035	3.5 mm	4.675 mm	Dry Film Lubricant	Metric Coarse	3.7 mm	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€124.84	100
A	A4184-3.5CNW053	5.3 mm	4.675 mm	Dry Film Lubricant	Metric Coarse	3.7 mm	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€131.57	100
A	A4184-3.5CNW070	7 mm	4.675 mm	Dry Film Lubricant	Metric Coarse	3.7 mm	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€144.68	100

CHRISLYNN -

M12 x 1.75 Grade 303 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Thread Size	Material
A	77356	16 mm	37/64"	M12 x 1.75	Stainless Steel	RFQ
A	77369	18 mm	21/32"	M12 x 1.75	Stainless Steel	RFQ

1 1/2"-12 Grade 304 Stainless Steel Locking Helical Inserts
Thread inserts are suitable for installing threaded fasteners in soft and thin materials with a stripped & threaded hole. They are ideal for automobile, aerospace and maintenance applications. They provide more strength, versatility & resilient operation than traditional threaded holes.
These locking inserts feature Grade 304 stainless steel construction for corrosion, heat and fire-resistant properties with moderate structural rigidity.

Style	Model	Insert Length	Drill Size	Free Coil Dia.	Thread Type	Thread Direction	Hardness	Tensile Strength	Price	Pkg. Qty.
A	84545	1 1/2"	1 17/32"	-	-	-	-	-	-	5	RFQ
A	84645	2 1/4"	1 17/32"	-	-	-	-	-	-	5	RFQ
B	A3591-24CN2250	2 1/4"	1 33/64"	1.727"	Fine	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€3,978.32	100
A	84845	3 3/4"	1 17/32"	-	-	-	-	-	-	5	RFQ
A	84745	3"	1 17/32"	-	-	-	-	-	-	5	RFQ
A	84945	4 1/2"	1 17/32"	-	-	-	-	-	-	5	RFQ

CHRISLYNN -

3 1/2"-8 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Thread Size	Material
A	83320-1.0L	3 1/2"	3 1/2"	3 1/2"-8	Stainless Steel	RFQ
A	83320-1.25L	4 3/8"	3 1/2"	3 1/2"-8	Stainless Steel	RFQ

CHRISLYNN -

1 1/2"-8 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Thread Type	Drill Size	Type	Number Of Pieces	Thread Size	Material	Price
A	83304-1.0L	1 1/2"	-	1 1/2"	-	-	1 1/2"-8	Stainless Steel	-	RFQ
B	83304-1.5L	2 1/4"	Coarse	1 1/2"	Standard	1	1 1/2"-8	Stainless Steel	€81.03
A	83304-2.0L	3"	-	1 1/2"	-	-	1 1/2"-8	Stainless Steel	-	RFQ

CHRISLYNN -

2 1/4"-8 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Thread Type	Drill Size	Type	Number Of Pieces	Thread Size	Material	Price
A	83310-1.0L	2 1/4"	-	2 1/4"	-	-	2 1/4"-8	Stainless Steel	-	RFQ
B	83310-1.5L	3 3/8"	Coarse	2 1/4"	Standard	1	2 1/4"-8	Stainless Steel	€250.40

1/4"-20 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Free Coil Dia.	Finish	Thread Type	Thread Direction	Hardness	Tensile Strength	Price	Pkg. Qty.
A	A3585-4CNW500	1/2"	H	8/25"	Dry Film Lubricant	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€158.26	100
A	3585-4CNW500S	1/2"	H	8/25"	Dry Film Lubricant	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€927.87	500
A	A3585-4CN500	1/2"	H	8/25"	-	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€138.01	100
B	AT3585-4C500	1/2"	G	8/25"	-	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€150.62	100
C	84716	1/2"	17/64"	-	-	-	-	-	-	-	100	RFQ
A	3585-4CN500S	1/2"	H	8/25"	-	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€960.80	1
B	AT3585-4CW500	1/2"	G	8/25"	Dry Film Lubricant	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€185.37	100
B	AT3585-4CW250	1/4"	G	8/25"	Dry Film Lubricant	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€172.58	100
A	A3585-4CNW250	1/4"	H	8/25"	Dry Film Lubricant	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€146.75	100
A	A3585-4CN250	1/4"	H	8/25"	-	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€118.15	100
A	3585-4CNW250S	1/4"	H	8/25"	Dry Film Lubricant	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€1,712.99	1
C	84516	1/4"	17/64"	-	-	-	-	-	-	-	100	RFQ
A	3585-4CN250S	1/4"	H	8/25"	-	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€1,151.92	1
B	AT3585-06C276	1/4"	H	8/25"	-	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€149.21	100
B	AT3585-4C250	1/4"	G	8/25"	-	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€159.53	100
C	84916	3/4"	17/64"	-	-	-	-	-	-	-	100	RFQ
A	3585-4CNW375S	3/8"	H	8/25"	Dry Film Lubricant	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€1,771.39	1
A	3585-4CN375S	3/8"	H	8/25"	-	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€1,203.65	1000
C	84616	3/8"	17/64"	-	-	-	-	-	-	-	100	RFQ
B	AT3585-4CW375	3/8"	G	8/25"	Dry Film Lubricant	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€181.74	100
A	A3585-4CN375	3/8"	H	8/25"	-	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€132.37	100
B	AT3585-4C375	3/8"	G	8/25"	-	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€149.67	100
A	A3585-4CNW375	3/8"	H	8/25"	Dry Film Lubricant	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€150.28	100
C	84816	5/8"	17/64"	-	-	-	-	-	-	-	100	RFQ

CHRISLYNN -

7/16"-20 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Thread Size	Material	Pkg. Qty.
A	84523	0.438"	29/64"	7/16"-20	Stainless Steel	50	RFQ
A	84623	0.656"	29/64"	7/16"-20	Stainless Steel	50	RFQ
A	84823	1.094"	29/64"	7/16"-20	Stainless Steel	50	RFQ
A	84923	1.312"	29/64"	7/16"-20	Stainless Steel	50	RFQ
A	84723	7/8"	29/64"	7/16"-20	Stainless Steel	50	RFQ

3/4"-10 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Free Coil Dia.	Thread Type	Drill Size	Thread Direction	Hardness	Tensile Strength	Price	Pkg. Qty.
A	84731	1 1/2"	-	-	25/32"	-	-	-	-	15	RFQ
B	3585-12CN1125	1 1/8"	0.893"	Coarse	25/32"	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€20.37	1
A	84631	1 1/8"	-	-	25/32"	-	-	-	-	15	RFQ
A	84831	1 7/8"	-	-	25/32"	-	-	-	-	15	RFQ
A	84931	2 1/4"	-	-	25/32"	-	-	-	-	15	RFQ
B	3585-12CN750	3/4"	0.893"	Coarse	25/32"	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€15.01	1
A	84531	3/4"	-	-	25/32"	-	-	-	-	15	RFQ

1 1/8"-7 Grade 304 Stainless Steel Locking Helical Inserts

Style	Model	Insert Length	Drill Size	Free Coil Dia.	Thread Type	Thread Direction	Hardness	Tensile Strength	Price	Pkg. Qty.
A	84538	1 1/8"	1 5/32"	-	-	-	-	-	-	5	RFQ
B	3585-18CN1125	1 1/8"	1 11/64"	1.335"	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€23.75	1
A	84638	1.688"	1 5/32"	-	-	-	-	-	-	5	RFQ
B	3585-18CN1688	1.688"	1 11/64"	1.335"	Coarse	Right Hand	Rockwell C43-C50	200000 psi to 250000 psi	€28.08	1
A	84738	2 1/4"	1 5/32"	-	-	-	-	-	-	5	RFQ
A	84838	2.812"	1 5/32"	-	-	-	-	-	-	5	RFQ
A	84938	3 3/8"	1 5/32"	-	-	-	-	-	-	5	RFQ

1...567 8