Large Flat Head Screw Galvanized Flat Head Knurled Screw Round Hand Twisted Bolt

• Customization: Available
• Material: Carbon Steel
• Type: Round Head
• Model NO.: 20250607-6
• Connection: Common Bolt
• Head Style: Round
• Standard: DIN, ANSI, GB, JIS, BSW, GOST
• Grade: 8.8
• Application: Machinery, Chemical Industry, Environmental, Building
• Finish: Hot Galvanizing
• Diameter: as The Customer Required
• Thread: Coarse Thread
• Treatment: Natural, Black Coating, Zinc
• Materials: Stainless Steel
• Number of Starts: Single
• Hardening: 8.8
• Processing Equipment: Cold Heading
• Sample: Sample Free, Freight Is on Your Own Account
• Transport Package: Carton
• Specification: as the customer required
• Trademark: as the customer required
• Origin: China
• HS Code: 7318159001
• Production Capacity: 100000 Pieces/Year
• Package Size: 30.00cm * 25.00cm * 20.00cm
• Package Gross Weight: 37.000kg

Product Description

 

Product Description

Product Description:Hand tightened bolts are a type of fastener designed with human touch, featuring unique ear shaped or wing shaped heads that allow users to tighten them manually without the need for tools. They are particularly suitable for situations that require frequent adjustment or quick disassembly. Adopting an ergonomic wavy edge design, it can be easily operated even with gloves, making it an ideal choice for mechanical equipment maintenance, electronic instrument assembly, and exhibition setup.

Thread Size(d)			M5	M6	M8	M10	M12	M16	M20
P	Thread Pitch		0.8	1	1.25	1.5	1.75	2	2.5
ds	Nominal		6.5	8	10	13	16	20	25
	Max.		6.487	7.987	9.987	12.984	15.984	19.980	24.980
	Min.		6.451	7.951	9.951	12.941	15.941	19.928	24.928
b	Max.		9.75	11.25	13.25	16.40	18.40	22.40	27.40
	Min.		9.25	10.75	12.75	15.60	17.60	21.60	26.60
dk	Flat-end	Max.	10	13	16	18	24	30	36
	Knurled Head	Max.	10.22	13.27	16.27	18.27	24.33	30.33	36.39
	Min.		9.78	12.73	15.73	17.73	23.67	29.67	35.61
ds1	Max.		3.86	4.58	6.25	7.91	9.57	13.33	16.57
	Min.		3.68	4.40	6.03	7.69	9.35	12.96	16.30
e	Min.		3.44	4.58	5.72	6.86	9.15	11.43	13.72
k	Max.		4.5	5.5	7	9	11	14	16
	Min.		4.32	5.32	6.78	8.78	10.73	13.73	15.73
g1	Max.		2.5	2.5	2.5	2.5	2.5	2.5	3
g2	Max.		2	2.5	3.1	3.7	4.4	5	6.3
r	Min.		0.25	0.4	0.6	0.6	0.6	0.8	0.8
s	Nominal		3	4	5	6	8	10	12
	Max.		3.08	4.095	5.095	6.095	8.115	10.115	12.142
	Min.		3.02	4.02	5.02	6.02	8.025	10.025	12.032
t	Min.		2.4	3.3	4.2	4.9	6.6	8.8	10

Product Parameters

We produce all types of standard or non-standard thread screws according to customer's request.Detailed as following table:

Specification Table of Thread Screw
Standard	Size	Pitch of thread (mm)	d(mm)		Wire Diameter ±0.02mm
			Max	Min
Chinese National Standard Coarse Thread 60°	M5	0.80	4.98	4.83	4.30
	M6	1.00	5.97	5.82	5.18
	M7	1.00	6.97	6.82	6.18
	M8	1.25	7.96	7.79	7.02
	M9	1.25	8.96	8.79	8.01
	M10	1.50	9.96	9.77	8.84
	M11	1.50	10.97	10.73	9.84
	M12	1.75	11.95	11.76	10.7
	M14	2.00	13.95	13.74	12.5
	M16	2.00	15.95	15.74	14.5
	M18	2.50	17.95	17.71	16.20
	M20	2.50	19.95	19.71	18.2
Chinese National Standard Fine Thread 60°	M5	0.50	4.97	4.86	4.57
	M6	0.75	5.97	5.85	5.41
	M7	0.75	6.97	6.85	6.41
	M8	1.00	7.97	7.83	7.24
	M9	1.00	8.97	8.83	8.24
	M10	1.00	9.97	9.82	9.23
	M10	1.25	9.96	9.81	9.07
	M12	1.25	11.97	11.76	11.07
	M12	1.50	11.96	11.79	10.89
	M14	1.50	13.96	13.79	12.89
	M16	1.50	15.96	15.79	14.89
	M18	1.50	17.95	17.73	16.86
	M20	1.50	19.95	19.65	18.85

Specification Table of Thread Screw
Standard	Size	Thread per inch	d(mm)		Wire Diameter ±0.02mm
			Max	Min
British Standard Whitworth Thread (Coarse) 55°	1/8	40	3.145	3.03	2.70
	5/32	32	3.945	3.795	3.38
	3/16	24	4.732	4.592	4.00
	1/4	20	6.32	6.165	5.45
	5/16	18	7.905	7.737	6.94
	3/8	16	9.49	9.312	8.4
	7/16	14	11.2	10.88	9.84
	1/2	12	12.66	12.46	11.22
	9/16	12	14.25	14.04	12.81
	5/8	11	15.83	15.61	14.27
Unified Coarse Pitch Thread ( American Standard) 60°	4#	40	2.824	2.695	2.37
	5#	40	3.154	3.026	2.69
	6#	32	3.484	3.333	2.91
	8#	32	4.142	3.991	3.57
	10#	24	4.80	4.618	4.05
	12#	24	5.461	5.279	4.7
	1/4	20	6.322	6.117	5.45
	5/16	18	7.907	7.687	6.93
	3/8	16	9.491	9.254	8.40
	7/16	14	11.08	10.82	9.83
	1/2	13	12.66	12.39	11.32
	9/16	12	14.25	13.96	12.8
	5/8	11	15.83	15.53	14.26
Unified Fine Pitch Thread ( American Standard) 60°	4#	48	2.877	2.713	2.44
	5#	44	3.157	3.036	2.73
	6#	40	3.484	3.356	3.02
	8#	36	4.145	4.006	3.63
	10#	32	4.803	4.651	4.23
	12#	28	5.461	5.296	4.81
	1/4	28	6.324	6.16	5.68
	5/16	24	7.909	7.727	7.16
	3/8	24	9.497	9.315	8.74
	7/16	20	11.08	10.87	10.18
	1/2	20	12.67	12.46	11.76
	9/16	18	14.25	14.03	13.25
	5/8	18	15.83	15.62	14.83

 

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Manufacturing Capacity

Quality Control Method

Advanced Planning	Process Control	Quality Issue Feedback
·Multi-functional project team ·Build up standard tree,do the analysis and training ·DFMEA ·4 stage project review, quality gate ·PFMEA ·Visualized WI	·First and final piece100% inspection. ·Combine self-inspect and patrol inspect. ·Regular inspection on fixture and gauges. ·Upper andlower process error prevention control ·5M1E management	·Quick feedback, arrive sitewithin 10 minutes ·Define interim and containment action within 4hours ·Daily quick response meeting ·8D ·6 Sigma ·Actions follow-upvalidation ·Share to similarproducts ·Record into failure mode database

 

FAQ

Q1: Are you a manufacturer?
Yes, we have been in manufacturing and providing excellent linear motion partsfor customers more than 20years.
Q2: How long could you prepare samples?
Ans:Normally 1days if we have the sample onhand.lf customized one. about a week around.
Q3: How about batch order production?
Ans: Normally 30days or so for one container
Q4: Do you inspect the finished products?
Ans:Yes, we will do inspection according to lsO standard and ruled by our QCstaff.
Q5: How do you ship the goods?
Ans: By sea, by air by truck or by courier(UPSDHLFedexTNT etc.)
Q6: What advantage do you have?
Ans:1.We have professional engineers,customers can expect the best possibleadvice and support.

2.Related responsible team to answer all your questions and follow-upprocess for you and do update in time.

3.Strict and standard process control according to Quality ManagementSystem.
4.Documents support on products, we have strong technical data sheet tosupport our products, which could make you easier to know our products.