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

Selected 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 being installed into the insert. Materials like steel do not need long inserts. In contrast, for soft materials like aluminium, a longer insert is preferred.

How to install a helical thread insert?

Drill a hole according to the length of the insert / screw / bolt using the suggested drill bit size. Thread the drilled hole using a tap (sold separately), then wind the insert into the hole using an installation tool. Use a prong break-off tool or punch to remove the prong and allow free passage of the fastener.

How to install a key-locking thread insert?

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

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.

Thread Inserts

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Thread inserts are suitable for installing threaded fasteners in soft materials, thin materials or materials with a stripped & threaded hole. They are ideal for automobile, aerospace and...Read more

CHRISLYNN -

Rock Solid Heavy Duty Inserts, Metric, Carbon

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	65963	8mm	I	M8 x 1.25	M4 x 0.7	£24.62
A	65964	10mm	11/32"	M10 x 1.25	M5 x 0.8	£23.65
A	65965	12mm	27/64"	M12 x 1.25	M6 x 1	£24.07
A	66166	14mm	1/2"	M14 x 1.5	M8 x 1	£28.07
A	65966	14mm	1/2"	M14 x 1.5	M8 x 1.25	£24.39
A	66167	16mm	37/64"	M16 x 1.5	M10 x 1.25	£28.49
A	65967	16mm	37/64"	M16 x 1.5	M10 x 1.5	£24.74
A	65969	18mm	21/32"	M18 x 1.5	M12 x 1.75	£25.07
A	66169	18mm	21/32"	M18 x 1.5	M12 x 1.25	£25.07
A	66170	20mm	47/64"	M20 x 1.5	M14 x 1.5	£30.19
A	65970	20mm	47/64"	M20 x 1.5	M14 x 2	£28.20
A	66171	22mm	13/16"	M22 x 1.5	M16 x 1.5	£31.13
A	65971	22mm	13/16"	M22 x 1.5	M16 x 2	£26.71
A	66172	24mm	57/64"	M24 x 1.5	M18 x 1.5	£35.63
A	66173	30mm	1 3/32"	M30 x 2	M20 x 1.5	£40.16
A	65973	30mm	1 3/32"	M30 x 2	M20 x 2.5	£37.53
A	66174	32mm	1 3/16"	M32 x 2	M22 x 1.5	£43.70
A	66175	33mm	1 7/32"	M33 x 2	M24 x 2	£77.52
A	65975	33mm	1 7/32"	M33 x 2	M24 x 3	£77.52

CHRISLYNN -

Rock Solid Inserts, Metric, Heavy Duty, Stainless Steel

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size
A	76363	8mm	I	M8 x 1.25	M4 x 0.7	RFQ
A	76364	10mm	11/32"	M10 x 1.25	M5 x 0.8	RFQ
A	76365	12mm	27/64"	M12 x 1.25	M6 x 1	RFQ
A	76566	14mm	1/2"	M14 x 1.5	M8 x 1	RFQ
A	76366	14mm	1/2"	M14 x 1.5	M8 x 1.25	RFQ
A	76367	16mm	37/64"	M16 x 1.5	M10 x 1.5	RFQ
A	76567	16mm	37/64"	M16 x 1.5	M10 x 1.25	RFQ
A	76569	18mm	21/32"	M18 x 1.5	M12 x 1.25	RFQ
A	76369	18mm	21/32"	M18 x 1.5	M12 x 1.75	RFQ
A	76570	20mm	47/64"	M20 x 1.5	M14 x 1.5	RFQ
A	76370	20mm	47/64"	M20 x 1.5	M14 x 2	RFQ
A	76371	22mm	13/16"	M22 x 1.5	M16 x 2	RFQ
A	76571	22mm	13/16"	M22 x 1.5	M16 x 1.5	RFQ
A	76572	24mm	57/64"	M24 x 2	M18 x 1.5	RFQ
A	76573	30mm	1 3/32"	M30 x 2	M20 x 1.5	RFQ
A	76373	30mm	1 3/32"	M30 x 2	M20 x 2.5	RFQ
A	76574	32mm	1 3/16"	M32 x 2	M22 x 1.5	RFQ
A	76375	33mm	1 7/32"	M33 x 2	M24 x 3	RFQ
A	76575	33mm	1 7/32"	M33 x 2	M24 x 2	RFQ

CHRISLYNN -

Rock Solid Inserts, Miniature, Imperial

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	76283	0.12"	#29	8-32	2-56	£12.23
A	76285	0.17"	3/16"	12-28	6-32	£19.83
A	76284	0.17"	#20	10-32	4-40	£19.83
A	76286	0.22"	#1	1/4-28	8-32	£19.83

CHRISLYNN -

Rock Solid Miniature Inserts, Metric

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	76383	3.81mm	#23	M4.5 x 0.75	M2.5 x 0.45	£24.94
A	76382	3mm	#29	M4 x 0.7	M2 x 0.4	£24.94
A	76384	4.25mm	#17	M5 x 0.8	M3 x 0.5	£24.94
A	76386	5.25mm	7/32"	M6 x 0.75	M4 x 0.7	£24.94

CHRISLYNN -

Rock Solid Assortments, Imperial, Carbon

Style	Model	Material	Price (inc. VAT)
A	64900	C1215 Carbon	£286.67
A	64905	C1215 Carbon	£286.67

CHRISLYNN -

Rock Solid Assortments, Imperial, Stainless Steel

Style	Model	Material	Price (inc. VAT)
A	64906	303 Stainless Steel	£820.89
A	64901	303 Stainless Steel	£857.11

CHRISLYNN -

E Z Fix Inserts, UNC, Thin Wall Carbon

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	9319-6	0.5"	29/64"	1/2-13	3/8-16	£15.57
A	9319-7	0.56"	33/64"	9/16-12	7/16-14	£15.86
A	9319-8	0.62"	37/64"	5/8-11	1/2-13	£16.21
A	9319-3	0.312"	I	5/16-18	10-24	£14.84
A	9319-4	0.375"	Q	3/8-16	1/4-20	£14.94
A	9319-5	0.437"	X	7/16-14	5/16-18	£15.18

CHRISLYNN -

E Z Fix Heavy Duty Inserts, UNC, Carbon

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	9329-004	0.25"	5/32"	10-32	4-40	£14.48
A	9329-006	0.28"	#7	1/4-20	6-32	£14.61
A	9329-008	0.29"	F	5/16-18	8-32	£14.71
A	9329-3	0.406"	5/16"	3/8-16	10-24	£14.77
A	9329-4	0.437"	23/64"	7/16-14	1/4-20	£14.86
A	9329-5	0.484"	27/64"	1/2-13	5/16-18	£15.09
A	9329-6	0.515"	31/64"	9/16-12	3/8-16	£15.19
A	9329-8	0.656"	21/32"	3/4-10	1/2-13	£15.79
A	9329-9	0.656"	21/32"	3/4-10	9/16-12	£16.00
A	9329-7	0.656"	17/32"	5/8-11	7/16-14	£15.48
A	9329-10	0.687"	49/64"	7/8-9	5/8-11	£16.36
A	9329-12	0.781"	7/8"	1-8	3/4-10	£17.38
A	9329-801	1"	21/32"	3/4-10	1/2-13	£16.84
A	9329-16	1.25"	1 9/32"	1 3/8-12	1-8	£16.37
A	9329-1018	1.125"	49/64"	7/8-9	5/8-11	£17.90
A	9329-14	1.125"	1 7/64"	1 1/4-7	7/8-9	£22.89

CHRISLYNN -

E Z Fix Heavy Duty Inserts, UNC, Stainless Steel

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	9303-004	0.25"	5/32"	10-32	4-40	£8.56
A	9303-006	0.28"	#7	1/4-20	6-32	£16.50
A	9303-008	0.29"	F	5/16-18	8-32	£16.84
A	9303-3	0.406"	5/16"	3/8-16	10-24	£17.17
A	9303-4	0.437"	23/64"	7/16-14	1/4-20	£17.38
A	9303-5	0.484"	27/64"	1/2-13	5/16-18	£17.52
A	9303-6	0.515"	31/64"	9/16-12	3/8-16	£18.03
A	9303-8	0.656"	21/32"	3/4-10	1/2-13	£20.54
A	9303-7	0.656"	17/32"	5/8-11	7/16-14	£19.15
A	9303-10	0.687"	49/64"	7/8-9	5/8-11	£21.78
A	9303-12	0.781"	7/8"	1-8	3/4-10	£25.17

CHRISLYNN -

E Z Fix Extra-Heavy Duty Inserts, UNC, Carbon

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	9335-4	0.484"	27/64"	1/2-13	1/4-20	£15.09
A	9335-5	0.515"	31/64"	9/16-12	5/16-18	£15.19
A	9335-6	0.656"	17/32"	5/8-11	3/8-16	£15.48
A	9335-8	0.687"	49/64"	7/8-9	1/2-13	£16.36
A	9335-10	0.781"	7/8"	1-8	5/8-11	£17.02

CHRISLYNN -

E Z Fix Inserts, UNF, Thin Wall Carbon

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	9319-624	0.5"	29/64"	1/2-13	3/8-24	£15.57
A	9319-720	0.56"	33/64"	9/16-12	7/16-20	£15.86
A	9319-820	0.62"	37/64"	5/8-11	1/2-20	£16.21
A	9319-332	0.312"	I	5/16-18	10-32	£14.84
A	9319-428	0.375"	Q	3/8-16	1/4-28	£14.94
A	9319-524	0.437"	X	7/16-14	5/16-24	£15.18

CHRISLYNN -

E Z Fix Heavy Duty Inserts, UNF, Carbon

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	9329-332	0.406"	5/16"	3/8-16	10-32	£14.77
A	9329-428	0.437"	23/64"	7/16-14	1/4-28	£14.86
A	9329-524	0.484"	27/64"	1/2-13	5/16-24	£15.09
A	9329-624	0.515"	31/64"	9/16-12	3/8-24	£15.19
A	9329-820	0.656"	21/32"	3/4-10	1/2-20	£2.21
A	9329-720	0.656"	17/32"	5/8-11	7/16-20	£15.48
A	9329-918	0.656"	21/32"	3/4-10	9/16-18	£16.00
A	9329-10F	0.687"	49/64"	7/8-9	5/8-18	£16.36
A	9329-1216	0.781"	7/8"	1-8	3/4-16	£17.38
A	9329-1614	1.25"	1 9/32"	1 3/8-12	1-14	£16.37
A	9329-1414	1.125"	1 7/64"	1 1/4-7	7/8-14	£22.89

CHRISLYNN -

E Z Fix Heavy Duty Inserts, UNF, Stainless Steel

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size	Price (inc. VAT)
A	9303-332	0.406"	5/16"	3/8-16	10-32	£17.17
A	9303-428	0.437"	23/64"	7/16-14	1/4-28	£17.38
A	9303-524	0.484"	27/64"	1/2-13	5/16-24	£17.52
A	9303-624	0.515"	31/64"	9/16-12	3/8-24	£18.03
A	9303-820	0.656"	21/32"	3/4-10	1/2-20	£20.54
A	9303-720	0.656"	17/32"	5/8-11	7/16-20	£19.15

CHRISLYNN -

E Z Fix Spark Plug Inserts

Style	Model	Insert Length	Drill Size	External Thread Size	Internal Thread Size
A	9329-1406	0.328"	11/16"	3/4-16	M14 x 1.25	RFQ
A	9329-1208	0.453"	37/64"	5/8-18	M12 x 1.25	RFQ
A	9329-1808	0.453"	59/64"	1-12	M18 x 1.5	RFQ
A	9329-1008	0.453"	33/64"	9/16-18	M10 x 1	RFQ
A	9329-1408	0.453"	11/16"	3/4-16	M14 x 1.25	RFQ
A	9329-1212	0.703"	37/64"	5/8-18	M12 x 1.25	RFQ
A	9329-1412	0.703"	11/16"	3/4-16	M14 x 1.25	RFQ
A	9750-14	11.5mm	16.5mm	M18 x 1.5	M14 x 1.25	RFQ

CHRISLYNN -

E Z Fix Knife Thread Inserts

Style	Model	Insert Length	Drill Size	Internal Thread Size
A	9400-M5	0.5"	3/8"	M5 x 0.8	RFQ
A	9400-M6	0.5"	3/8"	M6 x 1	RFQ
A	9400-3	0.5"	3/8"	10-24	RFQ
A	9400-332	0.5"	3/8"	10-32	RFQ
A	9400-4	0.5"	3/8"	1/4-20	RFQ
A	9400-428	0.5"	3/8"	1/4-28	RFQ
A	9400-M3	0.375"	1/4"	M3 x 0.5	RFQ
A	9400-M4	0.375"	1/4"	M4 x 0.7	RFQ
A	9400-004	0.375"	1/4"	4-40	RFQ
A	9400-006	0.375"	1/4"	6-32	RFQ
A	9400-008	0.375"	1/4"	8-32	RFQ
A	9400-624	0.625"	1/2"	3/8-24	RFQ
A	9400-524	0.625"	1/2"	5/16-24	RFQ
A	9400-6	0.625"	1/2"	3/8-16	RFQ
A	9400-5	0.625"	1/2"	5/16-18	RFQ
A	9400-M8	0.625"	1/2"	M8 x 1.25	RFQ

E-Z LOK -

Finserts

Style	Model	Drill Size	Fins	Length	Price (inc. VAT)
A	170-006-BR	#5	1	3/16"	£28.10
B	270-006-BR	#5	2	3/8"	£32.96
C	370-332-BR	11/32"	3	9/16"	£56.31
D	370-4-BR	13/32"	3	9/16"	£28.70
E	370-5 BR	15/32"	3	9/16"	£18.21
F	270-008-BR	15/64"	2	3/8"	£36.44
G	170-008-BR	15/64"	1	3/16"	£25.40
H	270-4-BR	21/64"	2	3/8"	£48.57
I	270-332-BR	G	2	3/8"	£37.54
J	270-3-BR	G	2	3/8"	£35.32
K	170-332-BR	G	1	3/16"	£34.64

E-Z LOK -

Knurled Press Inserts

Style	Model	Drill Size	Length	Type	Price (inc. VAT)
A	260-332CR	1/4"	3/8"	Flanged	£22.04
B	240-332CR	1/4"	3/8"	Flush	£22.78
C	240-002CR	1/8"	5/32"	Flush	£20.09
D	260-002CR	1/8"	5/32"	Flanged	£27.23
E	240-5CR	3/8"	9/16"	Flush	£34.80
F	240-006CR	3/16"	1/4"	Flush	£11.43
G	260-006CR	3/16"	1/4"	Flanged	£14.22
H	240-4CR	5/16"	1/2"	Flush	£27.61
I	260-4CR	5/16"	1/2"	Flanged	£21.73
J	240-004CR	5/32"	3/16"	Flush	£9.86
K	260-004CR	5/32"	3/16"	Flanged	£18.28
L	240-6CR	7/16"	5/8"	Flush	£22.07
M	240-008CR	7/32"	5/16"	Flush	£18.28
N	260-008CR	7/32"	5/16"	Flanged	£18.81

GRAINGER -

Press Inserts

Style	Model	Drill Size	Length	Price (inc. VAT)
A	1GUC9	1/4"	3/8"	£23.74
B	1GUC5	1/8"	3/16"	£18.18
C	1GUC7	3/16"	1/4"	£18.91
D	1GUC6	3/16"	3/16"	£17.85
E	1GUD1	5/16"	1/2"	£22.58
F	1GUC8	7/32"	5/16"	£21.56

GRAINGER -

Power Drivers

Style	Model	Length	Shank Size	Price (inc. VAT)
A	4ZU86	1 3/4"	1/4"	£35.68
B	4ZU82	1 3/4"	1/4"	£32.73
A	4ZE51	1 3/4"	1/4"	£29.81
A	4ZE52	1 3/4"	1/4"	£31.19
A	4ZU85	1 3/4"	1/4"	£33.59
A	4ZE53	1 7/8"	1/4"	£30.38
C	4ZY12	2 "	3/8"	£38.08
D	4ZY13	2 "	3/8"	£35.59
E	4ZE57	2 1/8"	3/8"	£31.97
E	4ZE58	2 1/8"	3/8"	£30.65
E	4ZE60	2 1/8"	3/8"	£31.91

WALTER TOOLS -

Indexable Parting And Grooving Insert, Right Hand, 2Mm Max. Grooving Width

Model	Item	Price (inc. VAT)
DX18-2E200R6-CF6 WSM33S	CH6PAD	£36.32

WALTER TOOLS -

Indexable Parting And Grooving Insert, Neutral, 2.5Mm Max. Grooving Width

Model	Item	Price (inc. VAT)
DX18-2E250N02-GD6 WSM33S	CH6PAE	£36.32

Thread Inserts

Thread inserts are suitable for installing threaded fasteners in soft materials, thin materials or materials with a stripped & threaded hole. They are ideal for automobile, aerospace and maintenance applications. Raptor Supplies offers these thread inserts from brands like Grainger, Chrislynn, Helicoil, E-Z Lok & Walter. They provide more strength, versatility & resilient operation than traditional threaded holes.

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Thread Inserts

Rock Solid Heavy Duty Inserts, Metric, Carbon

Rock Solid Inserts, Metric, Heavy Duty, Stainless Steel

Rock Solid Inserts, Miniature, Imperial

Rock Solid Miniature Inserts, Metric

Rock Solid Assortments, Imperial, Carbon

Rock Solid Assortments, Imperial, Stainless Steel

E Z Fix Inserts, UNC, Thin Wall Carbon

E Z Fix Heavy Duty Inserts, UNC, Carbon

E Z Fix Heavy Duty Inserts, UNC, Stainless Steel

E Z Fix Extra-Heavy Duty Inserts, UNC, Carbon

E Z Fix Inserts, UNF, Thin Wall Carbon

E Z Fix Heavy Duty Inserts, UNF, Carbon

E Z Fix Heavy Duty Inserts, UNF, Stainless Steel

E Z Fix Spark Plug Inserts

E Z Fix Knife Thread Inserts

Finserts

Knurled Press Inserts

Press Inserts

Power Drivers

Indexable Parting And Grooving Insert, Right Hand, 2Mm Max. Grooving Width

Indexable Parting And Grooving Insert, Neutral, 2.5Mm Max. Grooving Width

Thread Inserts

Frequently Asked Questions

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Functionality

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Brands

Thread Inserts

Indexable Parting And Grooving Insert, Right Hand, 2Mm Max. Grooving Width

Indexable Parting And Grooving Insert, Neutral, 2.5Mm Max. Grooving Width

Thread Inserts

Frequently Asked Questions

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

How to choose the length of a helical insert?

How to install a helical thread insert?

How to install a key-locking thread insert?

Can thread inserts be removed once installed?

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