What are the four basic helical coil designs?

Tanged free-running coils: They feature a stainless steel coil for preventing corrosion and can be used for rapid repair of damaged threads. They adhere to military and aerospace standards. Tang-free free-running coils: They are identical to tanged free-running coils, but have no tang at the bottom. They feature a unique insert-driven notch for screw-in installation and remove the need to detach the tang before inserting the bolt. Tanged screw lock coils: These helical coils feature a straight segment in the coil that is flexed outward, producing pressure on the bolt and retaining torque to ensure the bolt's position. They are designed to maximise the contact area by applying pressure between the flanks of the bolt thread. Tang-free screw lock coils: These have a similar design as tanged screw lock helical coils, but instead of a tang, they employ a driving notch for installation.

Why are some thread inserts larger in diameter than the tapped hole before installation?

Some thread inserts have a slightly larger diameter than the diameter of the tapped hole before installation, as the installation tool decreases the leading coil's diameter when it applies torque to the insert's prong / tang for easy installation. Once the threaded insert is installed, it acts like a spring and expands outward onto the material for strong anchoring.

How to choose the length of a helical insert?

The helical insert length should be at least as long as the desired screw diameter. Users may also choose inserts having longer lengths for increased strength. The exact insert length can vary, depending upon the application & the material. Materials like steel do not need long inserts, but for soft materials like aluminium, a longer insert is preferred.

Can thread inserts be removed once installed?

Yes, some thread inserts can be removed using removal tools that attach to them & unwind them in the direction opposite to that used during installation.

Helical Thread Repair Inserts

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Helical thread repair inserts are designed to repair worn threads inside tapped holes. They provide reliable threading in metals, composites, wood or similar materials. Raptor Supplies...Read more

CHRISLYNN -

Grade 12L14 Steel Helical Thread Repair Inserts

Style	Model	Drill Size	Internal Thread Size	External Thread Size	Material	Price (inc. VAT)
A	9450-3	#7	M3 x 0.5	M6 x 1	Steel	£18.19
A	9550-006	#7	#6-32	M6 x 1	Steel	-	RFQ
A	9450-20	1 5/16"	M20 x 2.5	M36 x 4	Steel	-	RFQ
A	9650-6	5/16"	M6 x 1	3/8"-16	Steel	-	RFQ
A	9650-16	7/8"	M16 x 2	1"-8	Steel	-	RFQ
A	9650-12	21/32"	M12 x 1.75	3/4"-10	Steel	-	RFQ
A	9650-8	27/64"	M8 x 1.25	1/2"-13	Steel	-	RFQ
A	9650-10F	31/64"	M10 x 1.25	9/16"-12	Steel	-	RFQ
A	9650-10	31/64"	M10 x 1.5	9/16"-12	Steel	-	RFQ
A	9550-6	35/64"	3/8"-16	M16 x 2	Steel	-	RFQ
A	9450-10	35/64"	M10 x 1.5	M16 x 2	Steel	-	RFQ
A	9450-12	35/64"	M12 x 1.75	M16 x 2	Steel	-	RFQ
A	9550-8	35/64"	1/2"-13	M16 x 2	Steel	-	RFQ
A	9650-14	49/64"	M14 x 2	7/8"-9	Steel	-	RFQ
A	9450-16	53/64"	M16 x 2	M24 x 3	Steel	-	RFQ
A	9550-1032	I	#10-32	M8 x 1.25	Steel	-	RFQ
A	9550-1024	I	#10-24	M8 x 1.25	Steel	-	RFQ
A	9450-5	I	M5 x 0.8	M8 x 1.25	Steel	-	RFQ
A	9450-4	I	M4 x 0.7	M8 x 1.25	Steel	-	RFQ
A	9550-008	I	#8-32	M8 x 1.25	Steel	-	RFQ
A	9450-6	R	M6 x 1	M10 x 1.5	Steel	-	RFQ
A	9550-1420	R	1/4"-20	M10 x 1.5	Steel	-	RFQ
A	9450-8	Z	M8 x 1.25	M12 x 1.75	Steel	-	RFQ
A	9550-5	Z	5/16"-18	M12 x 1.75	Steel	-	RFQ

CHRISLYNN -

Standard Helical Thread Repair Inserts

Style	Model	Capacity	Type
A	87926M	10 Single Size Kits And One Master Kit	Metric Display Rack	RFQ
A	87926A	10 Single Size Kits And One Master Kit	American Display Rack	RFQ

POWERCOIL -

Grade 304 Stainless Steel Screw Locking Helical Thread Repair Inserts

Style	Model	Drill Size	Free Coil Dia.	Thread Type	Internal Thread Size	Thread Direction	Hardness	Tensile Strength	Price (inc. VAT)	Pkg. Qty.
A	3532-6GX1.0DSL	#25	0.193"	Coarse	#6-32	Right Hand	Rockwell C43-50	200000 psi	£6.90	10
B	3532-6GX1.5DSL	#25	0.193"	Coarse	#6-32	Right Hand	Rockwell C43-50	200000 psi	£7.17	10
C	3532-6GX2.0DSL	#25	0.193"	Coarse	#6-32	Right Hand	Rockwell C43-50	200000 psi	£5.71	10
D	3532-5GX1.0DSL	#29	0.173"	Coarse	#5-40	Right Hand	Rockwell C43-50	200000 psi	£5.56	10
E	3532-5GX1.5DSL	#29	0.173"	Coarse	#5-40	Right Hand	Rockwell C43-50	200000 psi	£8.79	10
F	3532-5GX2.0DSL	#29	0.173"	Coarse	#5-40	Right Hand	Rockwell C43-50	200000 psi	£8.56	10
G	3532-4GX2.0DSL	#31	0.159"	Coarse	#4-40	Right Hand	Rockwell C43-50	200000 psi	£8.51	10
H	3532-4GX1.0DSL	#31	0.159"	Coarse	#4-40	Right Hand	Rockwell C43-50	200000 psi	£6.13	10
I	3532-4GX1.5DSL	#31	0.159"	Coarse	#4-40	Right Hand	Rockwell C43-50	200000 psi	£4.77	10
J	3532-2GX1.0DSL	#41	0.119"	Coarse	#2-56	Right Hand	Rockwell C43-50	200000 psi	£7.13	10
K	3532-2GX1.5DSL	#41	0.119"	Coarse	#2-56	Right Hand	Rockwell C43-50	200000 psi	£8.06	10
L	3535-1X1.0DSL	1 1/64"	1.199"	Fine	1"-14	Right Hand	Rockwell C43-50	200000 psi	£4.94	1
M	3532-1.1/4X1.5DSL	1 9/32"	1.483"	Coarse	1 1/4"-7	Right Hand	Rockwell C43-50	200000 psi	£26.86	1
N	3534-1.1/4X1.5DSL	1 9/32"	1.469"	Fine	1 1/4"-12	Right Hand	Rockwell C43-50	200000 psi	£14.47	1
O	3534-1.1/4X1.0DSL	1 9/32"	1.469"	Fine	1 1/4"-12	Right Hand	Rockwell C43-50	200000 psi	£11.82	1
P	3532-1.1/4X1.0DSL	1 9/32"	1.483"	Coarse	1 1/4"-7	Right Hand	Rockwell C43-50	200000 psi	£11.82	1
Q	3532-1.1/2X1.0DSL	1 17/32"	1.772"	Coarse	1 1/2"-6	Right Hand	Rockwell C43-50	200000 psi	£20.37	1
R	3532-1.1/2X1.5DSL	1 17/32"	1.772"	Coarse	1 1/2"-6	Right Hand	Rockwell C43-50	200000 psi	£19.46	1
S	3534-1.1/2X1.0DSL	1 17/32"	1.745"	Fine	1 1/2"-12	Right Hand	Rockwell C43-50	200000 psi	£15.11	1
T	3532-1X1.5DSL	1.031"	1.196"	Coarse	1"-8	Right Hand	Rockwell C43-50	200000 psi	£9.07	1
U	3532-1X1.0DSL	1.031"	1.196"	Coarse	1"-8	Right Hand	Rockwell C43-50	200000 psi	£5.21	1
V	3532-1.1/8X1.5DSL	1.156"	1.355"	Coarse	1 1/8"-7	Right Hand	Rockwell C43-50	200000 psi	£12.93	1
W	3532-1.1/8X1.0DSL	1.156"	1.355"	Coarse	1 1/8"-7	Right Hand	Rockwell C43-50	200000 psi	£10.93	1
X	3520-2.50X1.5DSL	2.6 mm	3.7 mm	Metric Coarse	M2.5 x 0.45	Right Hand	Rockwell C43-50	200000 psi	£5.09	10
Y	3520-2.50X1.0DSL	2.6 mm	3.7 mm	Metric Coarse	M2.5 x 0.45	Right Hand	Rockwell C43-50	200000 psi	£4.18	10

CHRISLYNN -

Grade 303 Stainless Steel Helical Thread Repair Inserts

Style	Model	Drill Size	Internal Thread Size	External Thread Size	Material
A	9453-3	#7	M3 x 0.5	M6 x 1	Stainless Steel	RFQ
A	9653-6	5/16"	M6 x 1	3/8"-16	Stainless Steel	RFQ
A	9653-16	7/8"	M16 x 2	1"-8	Stainless Steel	RFQ
A	9653-12	21/32"	M12 x 1.75	3/4"-10	Stainless Steel	RFQ
A	9653-8	27/64"	M8 x 1.25	1/2"-13	Stainless Steel	RFQ
A	9653-10	31/64"	M10 x 1.5	9/16"-12	Stainless Steel	RFQ
A	9653-10F	31/64"	M10 x 1.25	9/16"-12	Stainless Steel	RFQ
A	9453-10	35/64"	M10 x 1.5	M16 x 2	Stainless Steel	RFQ
A	9453-12	35/64"	M12 x 1.75	M16 x 2	Stainless Steel	RFQ
A	9653-14	49/64"	M14 x 2	7/8"-9	Stainless Steel	RFQ
A	9453-16	53/64"	M16 x 2	M24 x 3	Stainless Steel	RFQ
A	9453-5	I	M5 x 0.8	M8 x 1.25	Stainless Steel	RFQ
A	9453-4	I	M4 x 0.7	M8 x 1.25	Stainless Steel	RFQ
A	9453-6	R	M6 x 1	M10 x 1.5	Stainless Steel	RFQ
A	9453-8	Z	M8 x 1.25	M12 x 1.75	Stainless Steel	RFQ

POWERCOIL -

Grade 304 Stainless Steel Free Running Helical Thread Repair Inserts

Style	Model	Drill Size	Free Coil Dia.	Thread Type	Internal Thread Size	Thread Direction	Hardness	Tensile Strength	Price (inc. VAT)	Pkg. Qty.
A	3532-6GX1.5D	#25	0.193"	Coarse	#6-32	Right Hand	Rockwell C43-50	200000 psi	£5.12	10
B	3532-6GX1.0D	#25	0.193"	Coarse	#6-32	Right Hand	Rockwell C43-50	200000 psi	£3.76	10
C	3532-6GX2.0D	#25	0.193"	Coarse	#6-32	Right Hand	Rockwell C43-50	200000 psi	£6.85	10
D	3532-5GX1.5D	#29	0.173"	Coarse	#5-40	Right Hand	Rockwell C43-50	200000 psi	£3.50	10
E	3532-5GX2.0D	#29	0.173"	Coarse	#5-40	Right Hand	Rockwell C43-50	200000 psi	£6.74	10
F	3532-5GX1.0D	#29	0.173"	Coarse	#5-40	Right Hand	Rockwell C43-50	200000 psi	£3.31	10
G	3532-4GX1.0D	#31	0.159"	Coarse	#4-40	Right Hand	Rockwell C43-50	200000 psi	£5.43	10
H	3532-4GX1.5DTL	#31	0.159"	Coarse	#4-40	Right Hand	Rockwell C43-50	200000 psi	£104.07	100
G	3532-4GX2.0D	#31	0.159"	Coarse	#4-40	Right Hand	Rockwell C43-50	200000 psi	£7.09	10
G	3532-4GX1.5D	#31	0.159"	Coarse	#4-40	Right Hand	Rockwell C43-50	200000 psi	£5.20	10
G	3532-2GX1.5D	#41	0.119"	Coarse	#2-56	Right Hand	Rockwell C43-50	200000 psi	£6.80	10
G	3532-2GX1.0D	#41	0.119"	Coarse	#2-56	Right Hand	Rockwell C43-50	200000 psi	£4.17	10
I	3534-1X1.0D	1 1/64"	1.199"	Fine	#1-12	Right Hand	Rockwell C43-50	200000 psi	£4.74	1
J	3534-1X1.5D	1 1/64"	1.199"	Fine	#1-12	Right Hand	Rockwell C43-50	200000 psi	£7.36	1
K	3535-1X1.5D	1 1/64"	1.199"	Fine	1"-14	Right Hand	Rockwell C43-50	200000 psi	£5.01	1
L	3535-1X1.0D	1 1/64"	1.199"	Fine	1"-14	Right Hand	Rockwell C43-50	200000 psi	£5.71	1
M	3532-1.1/4X1.5D	1 9/32"	1.483"	Coarse	1 1/4"-7	Right Hand	Rockwell C43-50	200000 psi	£12.17	1
N	3534-1.1/4X1.0D	1 9/32"	1.469"	Fine	1 1/4"-12	Right Hand	Rockwell C43-50	200000 psi	£10.23	1
O	3534-1.1/4X1.5D	1 9/32"	1.469"	Fine	1 1/4"-12	Right Hand	Rockwell C43-50	200000 psi	£14.39	1
P	3532-1.1/4X1.0D	1 9/32"	1.483"	Coarse	1 1/4"-7	Right Hand	Rockwell C43-50	200000 psi	£16.64	1
Q	3532-1.1/2X1.5D	1 17/32"	1.772"	Coarse	1 1/2"-6	Right Hand	Rockwell C43-50	200000 psi	£26.19	1
R	3534-1.1/2X1.0D	1 17/32"	1.745"	Fine	1 1/2"-12	Right Hand	Rockwell C43-50	200000 psi	£26.30	1
S	3532-1.1/2X1.0D	1 17/32"	1.772"	Coarse	1 1/2"-6	Right Hand	Rockwell C43-50	200000 psi	£15.14	1
T	3532-1X1.0D	1.031"	1.196"	Coarse	1"-8	Right Hand	Rockwell C43-50	200000 psi	£6.17	1
U	3532-1X1.5D	1.031"	1.196"	Coarse	1"-8	Right Hand	Rockwell C43-50	200000 psi	£10.45	1

VOLKEL -

Screws OS, Typ A, M 13 x 1.5 Size

Model	Item	Price (inc. VAT)	Pkg. Qty.
19130	CM4VZU	£21.70	1

VOLKEL -

Screws OS, Typ A, M 15 x 1.5 Size

Model	Item	Price (inc. VAT)	Pkg. Qty.
19131	CM4VZV	£21.70	1

VOLKEL -

Screws OS, Typ B, M 17 x 1.5 Size

Model	Item	Price (inc. VAT)	Pkg. Qty.
19132	CM4VZW	£21.70	1

VOLKEL -

Screws OS, Typ B, M 20 x 1.5 Size

Model	Item	Price (inc. VAT)	Pkg. Qty.
19133	CM4VZX	£21.70	1

VOLKEL -

Screws OS, Typ B, M 24 x 1.5 Size

Model	Item	Price (inc. VAT)	Pkg. Qty.
19134	CM4VZY	£21.70	1

VOLKEL -

Solid Thread, Made of Galvanised Steel, M 14 x 1.25 - 9.5mm Size

Model	Item	Price (inc. VAT)	Pkg. Qty.
19136	CM4VZZ	£2.67	1

VOLKEL -

Solid Thread, Made of Galvanised Steel, M 14 x 1.25 - 11.2mm Size

Model	Item	Price (inc. VAT)	Pkg. Qty.
19137	CM4WAA	£2.75	1

VOLKEL -

Solid Thread, Made of Galvanised Steel, M 14 x 1.25 - 12.7mm Size

Model	Item	Price (inc. VAT)	Pkg. Qty.
19138	CM4WAB	£2.75	1

VOLKEL -

Solid Thread, Made of Galvanised Steel, M 14 x 1.25 - 17.5mm Size

Model	Item	Price (inc. VAT)	Pkg. Qty.
19139	CM4WAC	£2.92	1