DIN653 M4 Stainless Steel Knob Screw 316 304 Flat Head Knurled Thumb Screw

Product Description

DIN653 M4 Stainless Steel Knob Screw 316 304 Flat Head Adjustable Knurled Thumb Screw

Stainless Steel Knurled Thumb Screw
Material:	Carbon Steel, Stainless Steel, Brass etc.
Standards:	GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS, ETC
Size:	M1-M10 or non-standard asa request & design
Finish:	Plain, Black, Zinc, Yellow Zinc, HDG, Geomet, Dacromet, etc.

 

Thread Size d		M1	M1.2	M1.4	M1.6	M2	M2.5	M3	M4	M5	M6	M8	M10
P	Pitch	0.25	0.25	0.3	0.35	0.4	0.45	0.5	0.7	0.8	1	1.25	1.5
a	max	0.75	0.75	0.9	1.05	1.2	1.35	1.5	2.1	2.4	3	3.75	4.5
c		-	-	-	-	-	0.3	0.3	0.4	0.4	0.5	0.6	0.8
dk	Nominal Size	5.5	6	7	7.5	9	11	12	16	20	24	30	36
	max	5.74	6.24	7.29	7.79	9.29	11.35	12.35	16.35	20.42	24.42	30.42	36.5
	min	5.26	5.76	6.71	7.29	8.71	10.65	11.65	15.65	19.58	23.58	29.58	35.5
ds	max=nominal size	-	-	-	-	2	2.5	3	4	5	6	8	10
	min	-	-	-	-	1.86	2.36	2.86	3.82	4.82	5.82	7.78	9.78
e		-	-	-	-	1.5	2	2	3	3	4	5	6
k	max	1.5	1.5	2	2	2	2.5	2.5	3.5	4	5	6	8
	min	1.25	1.25	1.75	1.75	1.75	2.25	2.25	3.2	3.7	4.7	5.7	7.64
r		0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	1	1	2	2
Knurled pitch		0.5	0.5	0.5	0.5	0.5	0.6	0.6	0.6	0.6	0.6	0.6	0.8

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: DIN933, DIN931, DIN912, DIN603, DIN7985, DIN7991, DIN6921, ASME/ANSI B 18.2.1, ASME/ANSI B18.2.3.1 M, GB, BSW, ISO Hex bolt, carriage bolt, heavy hex bolt, flange head bolt, anchor bolt, etc

: DIN934, DIN6923, DIN985, ISO4032 hex heavy hex nut, 2H nut, A563 / A563M cap nut, nylon nut, etc

: threaded rod DIN975,DIN976, threaded bar DIN975 stud bolt, B7 stud bolt ect

: hex screw, DIN912; self-drilling screw, DIN7504; self-tapping screw, DIN7981/7982; drywall screw, pan head screw, button head screw, machine screw, chipboard screw, furniture screw, wood screw, etc

: flat washer DIN125, spring washer DIN127, lock washer, square washer, spring lock washer, plain washer, etc

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FAQ

Q1: What types of screws do you manufacture?

A1: We produce a full range of industrial screws including self-tapping screws, self-drilling screws, machine screws, wood screws, drywall screws, concrete screws, and customized non-standard screws.

Q2: What materials are available for your screws?

A2: Our screws are available in carbon steel (C1022, C1018), stainless steel (A2/304, A4/316), hardened steel, alloy steel, and brass.
Material selection depends on tensile strength and corrosion-resistance requirements.

Q3: Do you provide samples before mass production?

A3: Yes, we offer free or low-cost samples for quality and dimension confirmation prior to order.

Q4: How do you control product quality?

A4: Every batch is tested for torque, hardness, thread precision, and salt spray corrosion resistance, following ISO 9001 quality system standards.

Q5: Do you offer OEM or customized production?

A5: Yes. We can produce screws according to samples, technical drawings, or specific drive/head combinations, and offer custom packaging and labeling.

Q6: What is the tolerance and precision level of your threads?

A6: We use automated thread rolling with precision tooling.
Thread tolerance typically meets 6g / 6H and can be customized for special fitting requirements.

Q7: Will stainless steel bolts rust over time?

A7: Under severe chemical or chloride exposure, A2 may develop slight surface corrosion. A4/316 performs better in harsh environments. We also offer passivation treatment for enhanced protection.