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 -

Precision Inserts, UNC, Small Quantity Packs

Style	Model	Thread Size	Insert Length	Drill Size	Price (inc. VAT)
A	83144	1 1/2-6	2.25"	1 17/32"	-	RFQ
A	83140	1 1/4-7	1.875"	1 9/32"	-	RFQ
A	83138	1 1/8-7	1.688"	1 5/32"	-	RFQ
A	83142	1 3/8-6	2.062"	1 13/32"	-	RFQ
A	83135	1-8	1.5"	1 1/32"	-	RFQ
A	83124	1/2-13	0.75"	17/32"	-	RFQ
A	83116	1/4-20	0.375"	17/64"	-	RFQ
A	83100	2-56	0.129"	3/32"	-	RFQ
A	83102	3-48	0.148"	#36	-	RFQ
A	83131	3/4-10	1.125"	25/32"	-	RFQ
A	83120	3/8-16	0.562"	25/64"	-	RFQ
A	83104	4-40	0.168"	#31	-	RFQ
A	83106	5-40	0.188"	#29	-	RFQ
A	83129	5/8-11	0.938"	21/32"	-	RFQ
A	83118	5/16-18	0.469"	21/64"	-	RFQ
A	83108	6-32	0.207"	#25	-	RFQ
A	83133	7/8-9	1.312"	29/32"	-	RFQ
A	83122	7/16-14	0.656"	29/64"	-	RFQ
A	83110	8-32	0.246"	11/64"	-	RFQ
A	83127	9/16-12	0.844"	19/32"	-	RFQ
A	83112	10-24	0.285"	13/64"	-	RFQ
A	83114	12-24	0.324"	15/64"	-	RFQ

CHRISLYNN -

Precision Tools Display Racks

Style	Model	Price (inc. VAT)
A	87926M	-	RFQ
A	87926A	-	RFQ

CHRISLYNN -

E Z Fix Inserts, Metric, Carbon

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	9450-3	6.5mm	#7	M6 x 1	M3 x 0.5	£17.76
A	9450-4	7.5mm	I	M8 x 1.25	M4 x 0.7	-	RFQ
A	9450-5	7.5mm	I	M8 x 1.25	M5 x 0.8	-	RFQ
A	9450-6	10.5mm	R	M10 x 1.5	M6 x 1	-	RFQ
A	9450-8	12.5mm	Z	M12 x 1.75	M8 x 1.25	-	RFQ
A	9450-12	17mm	35/64"	M16 x 2	M12 x 1.75	-	RFQ
A	9450-10	17mm	35/64"	M16 x 2	M10 x 1.5	-	RFQ
A	9450-16	20mm	53/64"	M24 x 3	M16 x 2	-	RFQ
A	9450-20	30mm	1 5/16"	M36 x 4	M20 x 2.5	-	RFQ

CHRISLYNN -

Precision Inserts, Metric, Small Quantity Packs

Style	Model	Thread Size	Insert Length	Drill Size	Price (inc. VAT)
A	83150	M2 x 0.4	3mm	#45	-	RFQ
A	83151	M2.2 x 0.45	3.3mm	#42	-	RFQ
A	83152	M2.5 x 0.45	3.8mm	#37	-	RFQ
A	83153	M3 x 0.5	4.5mm	1/8"	-	RFQ
A	83154	M3.5 x 0.6	5.3mm	#27	-	RFQ
A	83155	M4 x 0.7	6mm	11/64"	-	RFQ
A	83156	M5 x 0.8	7.5mm	13/64"	-	RFQ
A	83157	M6 x 1	9mm	1/4"	-	RFQ
A	83158	M7 x 1	10.5mm	9/32"	-	RFQ
A	83159	M8 x 1	12mm	21/64"	-	RFQ
A	83160	M8 x 1.25	12mm	21/64"	-	RFQ
A	83161	M9 x 1	13.5mm	3/8"	-	RFQ
A	83162	M9 x 1.25	13.5mm	3/8"	-	RFQ
A	83163	M10 x 1	15mm	13/32"	-	RFQ
A	83165	M10 x 1.5	15mm	13/32"	-	RFQ
A	83164	M10 x 1.25	15mm	13/32"	-	RFQ
A	83166	M11 x 1	16.5mm	7/16"	-	RFQ
A	83168	M11 x 1.5	16.55m	29/64"	-	RFQ
A	83167	M11 x 1.25	16.5mm	29/64"	-	RFQ
A	83146	M12 x 1	18mm	31/64"	-	RFQ
A	83170	M12 x 1.5	18mm	31/64"	-	RFQ
A	83169	M12 x 1.25	18mm	31/64"	-	RFQ
A	83171	M12 x 1.75	18mm	31/64"	-	RFQ
A	83172	M14 x 1.5	21mm	9/16"	-	RFQ
A	83147	M14 x 1.25	21mm	9/16"	-	RFQ

CHRISLYNN -

E Z Fix Inserts, Metric, Stainless Steel

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	9453-3	6.5mm	#7	M6 x 1	M3 x 0.5	-	RFQ
A	9453-5	7.5mm	I	M8 x 1.25	M5 x 0.8	-	RFQ
A	9453-4	7.5mm	I	M8 x 1.25	M4 x 0.7	-	RFQ
A	9453-6	10.5mm	R	M10 x 1.5	M6 x 1	-	RFQ
A	9453-8	12.5mm	Z	M12 x 1.75	M8 x 1.25	-	RFQ
A	9453-10	17mm	35/64"	M16 x 2	M10 x 1.5	-	RFQ
A	9453-12	17mm	35/64"	M16 x 2	M12 x 1.75	-	RFQ
A	9453-16	20mm	53/64"	M24 x 3	M16 x 2	-	RFQ

CHRISLYNN -

E Z Fix Inserts, Metric-Imperial, Carbon

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	9650-6	0.406"	5/16"	3/8-16	M6 x 1	-	RFQ
A	9650-8	0.484"	27/64"	1/2-13	M8 x 1.25	-	RFQ
A	9650-10	0.515"	31/64"	9/16-12	M10 x 1.5	-	RFQ
A	9650-10F	0.515"	31/64"	9/16-12	M10 x 1.25	-	RFQ
A	9650-12	0.656"	21/32"	3/4-10	M12 x 1.75	-	RFQ
A	9650-14	0.687"	49/64"	7/8-9	M14 x 2	-	RFQ
A	9650-16	0.781"	7/8"	1-8	M16 x 2	-	RFQ

CHRISLYNN -

E Z Fix Inserts, Metric and Imperial, Stainless Steel

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	9653-6	0.406"	5/16"	3/8-16	M6 x 1	-	RFQ
A	9653-8	0.484"	27/64"	1/2-13	M8 x 1.25	-	RFQ
A	9653-10	0.515"	31/64"	9/16-12	M10 x 1.5	-	RFQ
A	9653-10F	0.515"	31/64"	9/16-12	M10 x 1.25	-	RFQ
A	9653-12	0.656"	21/32"	3/4-10	M12 x 1.75	-	RFQ
A	9653-14	0.687"	49/64"	7/8-9	M14 x 2	-	RFQ
A	9653-16	0.781"	7/8"	1-8	M16 x 2	-	RFQ

CHRISLYNN -

E Z Fix Inserts, Imperial-Metric, Carbon

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	9550-006	6.5mm	#7	M6 x 1	6-32	-	RFQ
A	9550-008	7.5mm	I	M8 x 1.25	8-32	-	RFQ
A	9550-1024	7.5mm	I	M8 x 1.25	10-24	-	RFQ
A	9550-1032	7.5mm	I	M8 x 1.25	10-32	-	RFQ
A	9550-1420	10.5mm	R	M10 x 1.5	1/4-20	-	RFQ
A	9550-5	12.5mm	Z	M12 x 1.75	5/16-18	-	RFQ
A	9550-8	17mm	35/64"	M16 x 2	1/2-13	-	RFQ
A	9550-6	17mm	35/64"	M16 x 2	3/8-16	-	RFQ

POWERCOIL -

Helical Inserts

Style	Model	Drill Size	Free Coil Dia.	Length	Size	Tap Sizes	Thread Type	Type	Price (inc. VAT)
A	3532-6GX1.5DSL	#25	0.193"	0.207"	6-32	6-32	UNC	Screw Locking	£7.01
B	3532-6GX1.5D	#25	0.193"	0.207"	6-32	6-32	UNC	Free Running	£5.00
C	3532-6GX2.0D	#25	0.193"	0.276"	6-32	6-32	UNC	Free Running	£6.68
D	3532-6GX2.0DSL	#25	0.193"	0.276"	6-32	6-32	UNC	Screw Locking	£5.58
E	3532-6GX1.0D	#25	0.193"	0.138"	6-32	6-32	UNC	Free Running	£3.67
F	3532-6GX1.0DSL	#25	0.193"	0.138"	6-32	6-32	UNC	Screw Locking	£6.74
G	3532-5GX2.0DSL	#29	0.173"	0.25"	5-40	5-40	UNC	Screw Locking	£8.36
H	3532-5GX1.0D	#29	0.173"	0.125"	5-40	5-40	UNC	Free Running	£3.23
I	3532-5GX1.5D	#29	0.173"	0.188"	5-40	5-40	UNC	Free Running	£3.42
J	3532-5GX2.0D	#29	0.173"	0.25"	5-40	5-40	UNC	Free Running	£6.58
K	3532-5GX1.0DSL	#29	0.173"	0.125"	5-40	5-40	UNC	Screw Locking	£5.43
L	3532-5GX1.5DSL	#29	0.173"	0.188"	5-40	5-40	UNC	Screw Locking	£8.59
M	3532-4GX1.0D	#31	0.159"	0.112"	4-40	4-40	UNC	Free Running	£5.30
M	3532-4GX1.5D	#31	0.159"	0.168"	4-40	4-40	UNC	Free Running	£5.08
N	3532-4GX1.0DSL	#31	0.159"	0.112"	4-40	4-40	UNC	Screw Locking	£5.99
O	3532-4GX2.0DSL	#31	0.159"	0.224"	4-40	4-40	UNC	Screw Locking	£8.31
M	3532-4GX2.0D	#31	0.159"	0.224"	4-40	4-40	UNC	Free Running	£6.93
P	3532-4GX1.5DSL	#31	0.159"	0.168"	4-40	4-40	UNC	Screw Locking	£4.66
M	3532-2GX1.5D	#41	0.119"	0.129"	2-56	2-56	UNC	Free Running	£6.64
M	3532-2GX1.0D	#41	0.119"	0.086"	2-56	2-56	UNC	Free Running	£4.07
Q	3532-2GX1.0DSL	#41	0.119"	0.086"	2-56	2-56	UNC	Screw Locking	£6.96
R	3532-2GX1.5DSL	#41	0.119"	0.129"	2-56	2-56	UNC	Screw Locking	£7.87
S	3535-1X1.0D	1-1/64"	1.199"	1"	1-14	1-14	UNF	Free Running	£5.58
T	3534-1X1.5D	1-1/64"	1.199"	1.5"	1-12	1-12	UNF	Free Running	£7.18
U	3534-1X1.0D	1-1/64"	1.199"	1"	1-12	1-12	UNF	Free Running	£4.63

POWERCOIL -

Tangless Inserts

Style	Model	Drill Size	Free Coil Dia.	Length	Size	Tap Sizes	Thread Type	Type	Price (inc. VAT)
A	3532-6GX1.0DSLTL	#25	0.193"	0.138"	6-32	6-32	UNC	Screw Locking	-	RFQ
B	3532-6GX1.5DTL	#25	0.193"	0.207"	6-32	6-32	UNC	Free Running	-	RFQ
C	3532-6GX2.0ODTL	#25	0.193"	0.276"	6-32	6-32	UNC	Free Running	-	RFQ
D	3532-6GX1.0DTL	#25	0.193"	0.138"	6-32	6-32	UNC	Free Running	-	RFQ
E	3532-6GX1.5DSLTL	#25	0.193"	0.207"	6-32	6-32	UNC	Screw Locking	-	RFQ
F	3532-4GX2.0DTL	#31	0.159"	0.224"	4-40	4-40	UNC	Free Running	-	RFQ
G	3532-4GX1.5DTL	#31	0.159"	0.168"	4-40	4-40	UNC	Free Running	£101.63
H	3532-4GX2.0DSLTL	#31	0.159"	0.224"	4-40	4-40	UNC	Screw Locking	-	RFQ
I	3532-4GX1.0DSLTL	#31	0.159"	0.112"	4-40	4-40	UNC	Screw Locking	£182.19
J	3532-4GX1.0DTL	#31	0.159"	0.112"	4-40	4-40	UNC	Free Running	-	RFQ
K	3532-4GX1.5DSLTL	#31	0.159"	0.168"	4-40	4-40	UNC	Screw Locking	£188.66
L	3532-2GX2.0DTL	#41	0.119"	0.172"	2-56	2-56	UNC	Free Running	-	RFQ
M	3532-2GX1.5DTL	#41	0.119"	0.129"	2-56	2-56	UNC	Free Running	-	RFQ
N	3532-2GX1.5DSLTL	#41	0.119"	0.129"	2-56	2-56	UNC	Screw Locking	-	RFQ
O	3532-2GX1.0DSLTL	#41	0.119"	0.086"	2-56	2-56	UNC	Screw Locking	-	RFQ
P	3532-2GX2.0DSLTL	#41	0.119"	0.172"	2-56	2-56	UNC	Screw Locking	-	RFQ
Q	3532-2GX1.0DTL	#41	0.119"	0.086"	2-56	2-56	UNC	Free Running	-	RFQ
R	3532-8GX1.0DSLTL	11/64"	0.220"	0.164"	8-32	8-32	UNC	Screw Locking	-	RFQ
S	3532-8GX1.5DTL	11/64"	0.220"	0.246"	8-32	8-32	UNC	Free Running	-	RFQ
T	3532-8GX2.0DTL	11/64"	0.220"	0.328"	8-32	8-32	UNC	Free Running	-	RFQ
U	3532-8GX1.5DSLTL	11/64"	0.220"	0.246"	8-32	8-32	UNC	Screw Locking	-	RFQ
V	3532-8GX1.0DTL	11/64"	0.220"	0.164"	8-32	8-32	UNC	Free Running	-	RFQ
W	3532-8GX2.0DSLTL	11/64"	0.220"	0.328"	8-32	8-32	UNC	Screw Locking	-	RFQ
X	3532-10GX1.5DSLTL	13/64"	0.259"	0.285"	10-24	10-24	UNC	Screw Locking	-	RFQ
Y	3534-10GX1.5DSLTL	13/64"	0.256"	0.285"	10-32	10-32	UNF	Screw Locking	-	RFQ