UNC/UNF Free running wire thread inserts can be used to strengthen threads, giving applications a longer life. Each insert sharing the load over the entire bolt and hole, improving holding or pull out resistance. With a wire thread insert installed, a more even distribution of load and stress can be achieved. Free running wire thread inserts are generally made of type 304(18-8) stainless steel wire rolled into a diamond shape cross-section.

Features :

● Lightweight yet robust design gives superior holding power

● Quick and simple installation process

● Extensive stock of UNC, UNF inserts

● Large variety of materials and coating options

● Special lengths and diameter pitch combinations available to order

● A wide range of tooling options available

Applications:

● Automotive

● Rail carriages

● Metal construction

● Aerospace industry

● Agricultural machinery

● Construction machinery

● Electronic devices

● Mechanical engineering

● Wind power Solar

W and d1 are the control values for thread inserts (Free Running ) before they have been installed.

The length can only be measured for installed thread inserts.

d = Nominal thread diameter

P = Thread pitch

d1 = Outside diameter of thread insert prior to installation

W = Number of threads prior to installation

DHC = Outside diameter of the parent thread

D1HC = Crest diameter

B = Suitable twist drill diameter. Please note:

D1HC is critical for selecting the correct twist drill diameter

t1 = Minimum depth of tapped hole

t2 = The nominal length of the thread insert corresponds to the minimum length of the full parent thread for blind

holes or the minimum plate thickness for a through hole

t3 = Maximum screw-in depth when the tang is not removed

t5 = Distance of the thread insert from the joint face = 0.25 to 0.5 P, if t2 corresponds to the above mentioned

minimum value

Material :

● Stainless steel grade 304 (AS7245) austenitic corrosion resistant steel.

For normal applications up to 425°C .

● Stainless steel grade 316 (AISI 316) austenitic corrosion resistant steel.

For Marine applications up to 425°C .

Coating & Finishing :

● Silver Plating

Primarily used to reduce the effects of screw thread seizure in high temperature applications.

● Coloured Dye

Red, blue and green colour dyes are available for fast and secure visual inspection and identiﬁcation. These organic resin based dyes do not affect the installation or function of the inserts and normally do not need to be removed.

Technical Parameters - UNC/UNF

d number-threads	d	p	x d	L(mm)	W	d1 min.max (mm)	B(mm)
2-56	2.184	0.45	1d	2.18	3.3	2.7-3.1	2.3
			1.5d	3.28	5
			2d	4.37	6.8
4-40	2.845	0.64	1d	2.90	3.2	3.6-4.0	3.0
			1.5d	4.30	5.1
			2d	5.80	7.2
5-40	3.175	0.64	1d	3.20	3.7	4.0-4.4	3.3
			1.5d	4.80	5.9
			2d	6.40	8.2
6-32	3.505	0.79	1d	3.50	2.8	4.5-4.9	3.7
			1.5d	5.30	4.8
			2d	7.00	6.8
8-32	4.166	0.79	1d	4.20	4	5.2-5.6	4.4
			1.5d	6.25	6
			2d	8.30	8.7
8-36	4.166	0.71	1d	4.20	4.5	5.1-5.6	4.3
			1.5d	6.30	7.2
			2d	8.30	9.7
10-24	4.826	1.06	1d	4.80	3.3	6.1-6.6	5.1
			1.5d	7.20	5.4
			2d	9.60	7.5
10-32	4.826	0.79	1d	4.83	4.3	5.9-6.5	5.0
			1.5d	7.24	6.9
			2d	9.60	9.5
12-24	5.486	1.06	1d	5.50	4	6.8-7.2	5.8
			1.5d	8.20	6.3
			2d	11.00	8.8
1/4’’-20	6.35	1.27	1d	6.40	3.9	7.8-8.3	6.7
			1.5d	9.50	6.2
			2d	12.70	8.6
1/4’’-28	6.35	0.91	1d	6.35	5.3	7.7-8.3	6.6
			1.5d	9.50	8.6
			2d	12.70	11.8
5/16’’-18	7.938	1.41	1d	7.90	4.3	9.6-10.2	8.3
			1.5d	11.90	6.8
			2d	15.90	9.4
5/16’’-24	7.938	1.06	1d	7.90	5.9	9.6-10.2	8.2
			1.5d	11.90	9.4
			2d	15.90	12.8
3/18’’-16	9.525	1.59	1d	9.50	4.8	11.4-11.9	9.9
			1.5d	14.30	7.7
			2d	19.10	10.6
3/8’’-24	9.525	1.06	1d	9.50	7.3	11.4-11.9	9.8
			1.5d	14.30	11.5
			2d	19.10	15.6
7/16’’-14	11.113	1.81	1d	11.10	4.9	13.3-13.9	11.6
			1.5d	16.70	7.9
			2d	22.20	10.7
7/16’’-20	11.113	1.27	1d	11.10	7	13.3-13.7	11.4
			1.5d	16.70	11.1
			2d	22.20	15
1/12’’-13	12.7	1.95	1d	12.70	5.2	15.1-15.7	13.2
			1.5d	19.10	8.3
			2d	25.40	11.4
1/12’’-20	12.7	1.27	1d	12.70	7.9	15-15.6	13.0
			1.5d	19.10	12.8
			2d	25.40	17.3
9/16’’-18	14.288	1.41	1d	14.30	7.9	16.91-17.55	14.6
			1.5d	21.50	12
			2d	28.60	16
5/8’’-11	15.875	2.31	1d	15.9	5.7	18.8-19.4	16.5
			1.5d	23.8	9
			2d	31.8	12.3
5/8’’-18	15.875	1.41	1d	15.9	9.4	18.6-19.3	16.2
			1.5d	23.8	14.5
			2d	31.8	19.7
3/4’’-10	19.05	2.54	1d	19.1	6.3	22.3-23.0	19.7
			1.5d	28.6	9.9
			2d	38.1	13.5
3/4’’-16	19.05	1.59	1d	19.1	10.1	22.2-22.8	19.4
			1.5d	28.6	15.6
			2d	38.1	21
7/8’’-14	22.225	1.81	1d	22.2	10.3	25.9-26.7	22.6
			1.5d	33.3	15.9
			2d	44.5	21.6
1/8’’-14	25.4	3.18	1d	25.4	6.8	29.6-30.4	26.1
			1.5d	38.1	10.6
			2d	50.8	15.4
1’’-12	25.4	2.12	1d	25.4	10	29.6-30.4	30.0
			1.5d	38.1	15.6
			2d	25.4	11.8
1’’-14	25.4	1.81	1d	25.4	11.8	29.6-30.4	25.9
			1.5d	38.1	18.1
			2d	50.8	24.5

FQA

Q1: Are you trading company or manufacturer ?

A1: We are manufacturer since 2004 in Shen zhen ,China .

Q2: Do you have stock for items ?

A2: Yes , most of items are in stock for shippment .

Q3: How long is your delivery time?

A3: Generally it is 1day for stock item,10-15 days for custom items or big quantity over 50000 pcs .

Q4: Can you provide samples ? is it free or extra ?

A4: Yes, we could offer the sample for free charge but do not pay the cost of freight.

Q5. What about the payment terms?

A5: Generally 100% T/T in advance before shippment or mass production ,and we can also consult according to your requirement.

Q6: What's your advantage?

A6: The competitive prices, fast delivery and high quality. responsible-oriented employees strict tolerance, smooth finish and long-life performance.

Q7: What are your machining equipment?
A7: CNC milling machines, CNC turning machines, stamping machines,grinding machines,automatic lathe machines, tapping machines, grinding machines,screw machines, cutting machines and so on.

Q8: How to guarantee the Quality of Industrial Parts?

A8: We have been in fastener field over 19 years with full experience. And there are 5 checks in the whole processing,We have IQC (incoming quality control), IPQCS (in process quality control section), FQC (final quality control) and OQC (out-going quality control) to control each process of industrial parts production.

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UNC/UNF Free Running Wire Thread Insert

Features :

Applications: