This product is regulated by the following standards:

DIN 603 UNI 5731 UNI 5732 ISO 8677 BS 4933 7 NF E27-351 ISO 8678

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Cup head square neck bolts

This product is regulated by the following standards:

Standard DIN 603

Cup head square neck bolts

This standard DIN 603 applies to cup head square neck bolts, with metric threads M5 to M20, of product grade C and specifies technical delivery conditions.

Dimensions in mm - source DIN 603
Publication date: 05-2017 - Supersedes DIN 603: 09-2010
d thread size	Pitch	b			dk nom	f min/max		k		v max/min
d thread size	Pitch	l≤125	l>125≤200	l>200	dk nom	f min/max		min	max	v max/min
M 5	0.8	16	22	-	13	2.9	4.1	2.7	3.3	4.52	5.48
M 6	1	18	24	-	16	3.4	4.6	3.12	3.88	5.52	6.48
M 8	1.25	22	28	41	20	4.4	5.6	4.12	4.88	7.42	8.58
M 10	1.5	26	32	45	24	5.4	6.6	4.62	5.38	9.42	10.58
M 12	1.75	30	36	49	30	7.25	8.75	6.05	6.95	11.3	12.7
M 16	2	38	44	57	38	11.1	12.9	8.05	8.95	15.3	16.7
M 20	2.5	46	52	65	46	14.1	15.9	9.95	11.05	19.16	20.84

Dimensions in mm - source DIN 603
Publication date: 09 - 2010 - Supersedes DIN 603: 10 - 1981
d thread size	Pitch	b			dk nom	f min/max		k		v max/min
d thread size	Pitch	l≤125	l>125≤200	l>200	dk nom	f min/max		min	max	v max/min
M 5	0.8	16	22	-	13	2.9	4.1	2.7	3.3	4.52	5.48
M 6	1	18	24	-	16	3.4	4.6	3.12	3.88	5.52	6.48
M 8	1.25	22	28	41	20	4.4	5.6	4.12	4.88	7.42	8.58
M 10	1.5	26	32	45	24	5.4	6.6	4.62	5.38	9.42	10.58
M 12	1.75	30	36	49	30	7.25	8.75	6.05	6.95	11.3	12.7
M 16	2	38	44	57	38	11.1	12.9	8.05	8.95	15.3	16.7
M 20	2.5	46	52	65	46	14.1	15.9	9.95	11.05	19.16	20.84

Din 603-2010- Approximate weigth, in kg x1000 pcs, (ρ=7,85 kg/dm³)
d thread size	M5	M6	M8	M10	M12	M16	M20
nominal length l
16	4	6.9
20	4.5	7.6	13.8	22.7
25	5.1	8.5	15.4	25.2
30	5.9	9.6	17	27.7	45.7
35	6.7	10.7	19	30.2	49.4
40	7.5	11.8	21	32.7	53.1
45	8.3	12.9	23	35.8	56.8
50	9.1	14	25	38.9	61.2	119
55	9.9	15.1	26.9	42	65.6	126
60	10.7	16.2	28.9	45.1	70	133
65	11.5	17.3	30.9	48.2	74.4	141
70	12.3	18.4	32.9	51.3	78.8	149	247
80	13.9	20.6	36.8	57.5	87	165	272
90	15.5	22.8	40.8	63.7	96	181	297
100	17.1	25	44.8	69.9	105	197	322
110		27.2	48.8	76.1	114	213	347
120		29.4	52.8	82.3	123	229	372
130		31.6	56.8	88.5	132	245	397
140		32.8	60.8	95	141	261	422
150		35	64.8	101	150	277	447
160				107	159	293	497
180				119	177	325	547
200				131	195	357	597

Standard UNI 5731

Square neck bolts

Dimensions in mm - source UNI 5731 Withdrawn Publication date: 12 - 1965
d thread size	Pitch	b		dk nom	f nom	k nom	v nom
d thread size	Pitch	l≤125	l>125≤200	dk nom	f nom	k nom	v nom
M 5	0.8	16	-	13	3	2.5	5
M 6	1	18	-	15.5	4	3	6
M 8	1.25	22	-	20	5	4	8
M 10	1.5	26	32	25	6	5	10
M 12	1.75	30	36	30	8	6	12
M 14	2	34	40	35	9	7	14

UNI 5731-1965 - Approximate weigth, in kg x1000 pcs, (ρ=7,85 kg/dm³) - commercial items
d thread size	M5	M6	M8	M10	M12	M14
nominal length l
20	5.46
25	6.22	10.1
30	6.97	11.2	21.3
35	7.73	12.3	23.4	44.2
40	8.48	13.4	25.3	47.2	69.6
45	9.24	14.6	27.2	50.2	73.9	107
50	10	15.6	29.2	53.3	78.3	113
55	10.8	16.7	31.1	56.3	82.6	119
60	11.5	17.8	33	59.3	87	125
65	12.3	18.9	35	62.3	91.3	131
70	13	20	36.9	65.3	95.7	137
75	13.6	21	38.8	68.4	100	143
80	14.5	22	40.8	71.4	104	149
90		24.2	44.6	77.4	113	160
100		26.4	48.4	83.5	122	172
110		28.6	52.4	89.5	131	184
120			56.2	95.6	139	196
125			58.2	98.6	144	202
130				101	147	207
140				107	156	218
150				113	164	230
160				119	173	242
170				125	182	254
180				131	191	266
190				137	199	278
200				143	208	290

Standard UNI 5732

Cup square bolts with hexagon nut. Iso metric coarse thread. Finish C.

Dimensions in mm - source UNI 5732 withdrawn
Publication date: 12 - 1965
d thread size	Pitch	b		dk nom	f min/max		k		v min/max
d thread size	Pitch	l≤125	l>125≤200	dk nom	f min/max		min	max	v min/max
M 5	0.8	16	-	13	2.9	4.1	2.2	2.8	4.52	5.48
M 6	1	18	-	15.5	3.4	4.6	2.7	3.3	5.52	6.48
M 8	1.25	22	-	20	4.4	5.6	3.63	4.4	7.42	8.58
M 10	1.5	26	32	25	5.4	6.6	4.63	5.4	9.42	10.58
M 12	1.75	30	36	30	7.25	8.75	5.63	6.4	11.3	12.7
M 14	2	34	40	35	11.1	12.9	6.6	7.5	15.3	16.7

Standard ISO 8677

Cup head square neck bolts with large head — Product grade C

Specifies the characteristics of products with metric dimensions and thread sizes form M 5 up to and including M 20; with nominal lengths from 20 mm up to200 mm and specifications with reference to International Standards; gives an example for the designation

Dimensions in mm - source ISO 8677 Withdrawn Publication date: 11-1986
d thread size	Pitch	b			dk nom=max	f min	f max	k		v min	v max
d thread size	Pitch	l≤125	l>125≤200	l>200	dk nom=max	f min	f max	min	max	v min	v max
M 5	0.8	16	-	-	13	2.9	4.10	2.5	3.1	4.52	5.48
M 6	1	18	-	-	16	3.4	4.60	3	3.6	5.52	6.48
M 8	1.25	22	28	-	20	4.4	5.60	4	4.8	7.42	8.58
M 10	1.5	26	32	-	24	5.4	6.60	5	5.8	9.42	10.58
M 12	1.75	30	36	-	30	7.25	8.80	6	6.8	11.3	12.70
M 16	2	38	44	57	38	11.1	12.90	8	8.9	15.3	16.70
M 20	2.5	46	52	65	46	14.1	15.90	10	10.9	19.16	20.84

Standard BS 4933 7

Carriage bolts square neck

Dimensions in mm - source BS 4933 Table 7 Withdrawn
Publication date: 3 - 1973
d thread size	Pitch	dk min	dk max	k min	k max	f min	f max	v min	v max
M 5	0.8	10.2	11.3	2.5	3.1	2.5	3.1	4.52	5.48
M 6	1	12.4	13.5	3	3.6	3	3.6	5.52	6.48
M 8	1.25	16.9	18	4	4.8	4	4.75	7.42	8.58
M 10	1.5	21.2	22.5	5	5.8	5	5.75	9.42	10.58
M 12	1.75	25.7	27	6	6.8	6	6.75	11.3	12.7
M 16	2	34.4	36	8	8.9	8	8.9	15.3	16.7
M 20	2.5	43.4	45	10	10.9	10	10.9	19.16	20.84
M 24	3	52.1	54	12	13	12	13.1	23.16	24.84

Standard NF E27-351

Carriage bolts square neck

Dimensions in mm - source NF E27-351 Withdrawn
Publication date: 12-1969
d thread size	Pitch	dk	k	f	v
M 5	0.8	14	3	3.5	5
M 6	1	16	3.5	4.2	6
M 7	1	18	4	4.9	7
M 8	1.25	20	4.5	5.6	8
M 10	1.5	24	5.5	7	10
M 12	1.75	28	7	8.4	12
M 14	2	32	9	9.8	14
M 16	2	36	11	11.2	16
M 18	2.5	40	12	12.6	18
M 20	2.5	44	13	14	20
M 22	2.5	48	14	15.4	22
M 24	3	52	15	16.8	24
M 27	3	58	17	18.9	27
M 30	3.5	64	19	21	30

Standard ISO 8678

Cup head square neck bolts with small head and short neck — Product grade B

The norm specifies the characteristics of products with metric dimensions and thread sizes from M 6 up to and including M 20; with nominal lengths from 12 mm up to 160 mm and specifications with reference to International Standards; gives an example for the designation.

Dimensions in mm - source ISO 8677 Withdrawn Publication date: 11-1986
d thread size	Pitch	b		dk nom=max	f min	f max	k		v min	v max	e min
d thread size	Pitch	l≤125	l>125≤200	dk nom=max	f min	f max	min	max	v min	v max	e min
M 6	1	18	-	14.2	2.4	3	3	3.6	5.88	6.48	7.64
M 8	1.25	22	-	18	2.4	3	4	4.8	7.85	8.58	10.2
M 10	1.5	26	-	22.3	3.2	4	5	5.8	9.85	10.58	12.8
M 12	1.75	30	-	26.6	3.2	4	6	6.8	11.82	12.7	15.37
M 16	2	38	44	35	4.2	5	8	8.9	15.82	16.7	20.57
M 20	2.5	46	52	43	4.2	5	10	10.9	19.79	20.84	25.73

Cup head square neck bolts

Dimensions in mm - source DIN 603
Publication date: 09/2010 - Supersedes DIN 603: 10/1981
d thread size	Pitch	b			dk nom	f min/max		k		v min/max
d thread size	Pitch	l≤125	l>125≤200	l>200	dk nom	f min/max		min	max	v min/max
M 5	0.8	16	22	-	13	2.9	4.1	2.7	3.3	4.52	5.48
M 6	1	18	24	-	16	3.4	4.6	3.12	3.88	5.52	6.48
M 8	1.25	22	28	41	20	4.4	5.6	4.12	4.88	7.42	8.58
M 10	1.5	26	32	45	24	5.4	6.6	4.62	5.38	9.42	10.58
M 12	1.75	30	36	49	30	7.25	8.75	6.05	6.95	11.3	12.7
M 16	2	38	44	57	38	11.1	12.9	8.05	8.95	15.3	16.7
M 20	2.5	46	52	65	46	14.1	15.9	9.95	11.05	19.16	20.84

Dimensions in mm - source ISO 8677 - Publication date: 1986
d thread size	Pitch	b			dk nom=max	f min	k		v min
d thread size	Pitch	l≤125	l>125≤200	l>200	dk nom=max	f min	min	max	v min
M 5	0.8	16	-	-	13	2.9	2.5	3.1	4.52
M 6	1	18	-	-	16	3.4	3	3.6	5.52
M 8	1.25	22	28	-	20	4.4	4	4.8	7.42
M 10	1.5	26	32	-	24	5.4	5	5.8	9.42
M 12	1.75	30	36	-	30	7.25	6	6.8	11.3
M 16	2	38	44	57	38	11.1	8	8.9	15.3
M 20	2.5	46	52	65	46	14.1	10	10.9	19.16

Dimensions in mm - source UNI 5731 - Publication date: 1965
d thread size	Pitch	b		dk nom	f nom	k nom	v nom
d thread size	Pitch	l≤125	l>125≤200	dk nom	f nom	k nom	v nom
M 5	0.8	16	-	13	3	2.5	5
M 6	1	18	-	15.5	4	3	6
M 8	1.25	22	-	20	5	4	8
M 10	1.5	26	32	25	6	5	10
M 12	1.75	30	36	30	8	6	12
M 14	2	34	40	35	9	7	14

Din 603-2010- Approximate weigth, in kg x1000 pcs, (ρ=7,85 kg/dm³) - commercial items
d thread size	M5	M6	M8	M10	M12	M16	M20
nominal length l
16	4	6.9
20	4.5	7.6	13.8	22.7
25	5.1	8.5	15.4	25.2
30	5.9	9.6	17	27.7	45.7
35	6.7	10.7	19	30.2	49.4
40	7.5	11.8	21	32.7	53.1
45	8.3	12.9	23	35.8	56.8
50	9.1	14	25	38.9	61.2	119
55	9.9	15.1	26.9	42	65.6	126
60	10.7	16.2	28.9	45.1	70	133
65	11.5	17.3	30.9	48.2	74.4	141
70	12.3	18.4	32.9	51.3	78.8	149	247
80	13.9	20.6	36.8	57.5	87	165	272
90	15.5	22.8	40.8	63.7	96	181	297
100	17.1	25	44.8	69.9	105	197	322
110		27.2	48.8	76.1	114	213	347
120		29.4	52.8	82.3	123	229	372
130		31.6	56.8	88.5	132	245	397
140		32.8	60.8	95	141	261	422
150		35	64.8	101	150	277	447
160				107	159	293	497
180				119	177	325	547
200				131	195	357	597

Uni 5731-1965 - Approximate weigth, in kg x1000 pcs, (ρ=7,85 kg/dm³) - commercial items
d thread size	M5	M6	M8	M10	M12	M14
nominal length l
20	5.46
25	6.22	10.1
30	6.97	11.2	21.3
35	7.73	12.3	23.4	44.2
40	8.48	13.4	25.3	47.2	69.6
45	9.24	14.6	27.2	50.2	73.9	107
50	10	15.6	29.2	53.3	78.3	113
55	10.8	16.7	31.1	56.3	82.6	119
60	11.5	17.8	33	59.3	87	125
65	12.3	18.9	35	62.3	91.3	131
70	13	20	36.9	65.3	95.7	137
75	13.6	21	38.8	68.4	100	143
80	14.5	22	40.8	71.4	104	149
90		24.2	44.6	77.4	113	160
100		26.4	48.4	83.5	122	172
110		28.6	52.4	89.5	131	184
120			56.2	95.6	139	196
125			58.2	98.6	144	202
130				101	147	207
140				107	156	218
150				113	164	230
160				119	173	242
170				125	182	254
180				131	191	266
190				137	199	278
200				143	208	290

Full list of Suppliers of Cup head square neck bolts

Lithuania

Arnelitos Prekyba - WESTBOLT

Wholesaler and distributor of high quality fasteners

India

BRK INDUSTRIES

We are manufacturer of bolts and nuts since 1980, with over 50 years of experience in the fastener industry. Thanks to our experience, quality and service offered, we have made a mark on the field.

Netherlands

Stafa

Specialists in hot dip galvanized fasteners

Stafa is a leading European importer of fasteners and fixings with a huge range of more than 75,000 products.

Private label packaging, assembled sets and kits, direct manufacturer to customer for large volumes, retail store concepts, special parts and complete project deliveries.

India

Perfect Washers & Fasteners Pvt.ltd

We are a manufacturer and exporter of bolts and nuts as per DIN 601/555, hexagon building screws and DIN 603/555 mushroom headed square neck bolts / carriage bolts with nuts. We offer fasteners in steel grade 4.6, 4.8 and 5.6, in zinc-plated, plain and hot dip galvanized steel.

Austria

SCHMIDT'S Handelsgesellschaft GmbH-Weyland Steiner

The company Weyland-Steiner is a flexible supplier of norm, standard, drawing and special parts, as well as C-parts management!

Our strength is the rapid procurement of special parts in all materials and surfaces.

Full-service trader of tools, fittings and hardware.

United Arab Emirates

A...

Manufacturer of anchor bolts, square head bolts, carriage bolts and stud bolts

Thailand

B...

Manufacturer of hex head screws, carriage bolts and socket cap screws

India

B...

Manufacturer and distributor of bolts M5 - M24, nuts M4 - M24 and threaded rods M6 – M48

Italy

B...

Manufacturer of hot forged fasteners and nip bolts, from M20 to M64

Italy

B...

Manufacturer specialized in round head square neck bolts and special fasteners with diameters from 4 to 16 mm and length up to 200 mm

South Africa

C...

Manufacturer of hexagon head bolts, plough bolts, CSK nibs bolts, cup square bolts and hexagon nuts

Taiwan

C...

Manufacturer of cold forged fasteners for automotive.

Nominal Dia.: 1/4' (M6) - 1' (M24)

Lengths: 1/4' (12mm) - 12' (300mm)

Malaysia

C...

Manufacturer and supplier of high-quality carbon steel fasteners, hexagon, socket, HDG, railway screws. Sizes from M6 to M24

Italy

C...

Manufacturing through cold forging technology of steel products, from Ø6 to Ø33 and lengths proportional to the Ø from I = 10mm to I = 240mm

Tensile grades: 4.6 - 5.6 - 8.8 - 9.8 - 10.9 - 12.9 - B7 - B7M

Italy

D...

Producer of Hexagon, machine and welding screws in low and high tensile steel.

Producer of special screws on customer requirement.

Turkey

E...

Manufacturer and distributor of bolts, nuts and rivets.

Metric fasteners range from 3 to 20 in diameter and 8mm to 165mm in length.

Whitworth fasteners range from 1/8” to 3/4” in diameter and 5/16” to 6 1/2” in length.

Poland

F...

Manufacturer of hexagonal head screws and socket head screws, machine and tapping screws, round head square neck bolts, double end studs. Dia. 3÷16; lengths up to 160 mm

Afghanistan

F...

Manufacturer of self tapping screws, machine screws, wood screws and carriage bolts. Sizes from M2 to M10 and lengths up to 130 mm.

Italy

F...

Manufacturer of special connection elements and parts through cold forming

India

G...

Manufacturer of high tensile fasteners

India

G...

Manufacturer of nib bolts, cup square bolts and high strength friction grip bolts from M6 to M75

Netherlands

G...

Distributor of fasteners

China

H...

Manufacturer specialized in hex head bolts, carriage bolts and rail bolts

China

H...

Manufacturer and distributor of wood and construction screws, both standard and special

China

H...

Manufacturer of machine screws, carriage bolts and leg screws

China

H...

Manufacturer of high strength fasteners and welding pins

Poland

H...

Manufacturer and supplier of fastening elements for building-, machine-building and electronic industry, engineering, petrochemistry, and motorization.

China

J...

Manufacturer of threaded rods, metric and inch sizes

China

J...

Manufacturer of hex head bolts and carriage bolts

Taiwan

J...

Manufacturer of standard and special fasteners, from M4 to M30, from 1/4' to 1-1/4'. Lengths from 10 to 300mm and from 1/2' to 12'.

India

K...

Manufacturer of high tensile fasteners, railway fasteners, foundation bolts, gurad rail bolts and forging produtcts

India

K...

Manufacturer, distributor and supplier of automotive fasteners, industrial fasteners, structural bolting, fasteners for agricultural and road crash barriers

South Korea

K...

Leader manufacturer of hexagon head screws for costruction and high tensile screws. Diameters from M12 to M36. Production plants in Korea, Vietnam and China

L...

Manufacturer of screws, threaded studs and threaded rods in metric and inch sizes

Turkey

M...

Manufacturer of track bolts and plow bolts and nuts

Czech Republic

M...

Manufacturer of round head bolts, plough bolts

Turkey

M...

Manufacturer of high tensile fasteners, hot dip galvanized

Turkey

N...

Manufacturer of hot forged fasteners, plow bolts, metric (M8-M42) or Withworth (1/2” – 1½ ”) serires for automotive and tractor industry.

Estonia

N...

Products in different product groups: Cleaning, Lubrication, Surface Treatment, Glues, Tapes, Electrical and Additives.

China

N...

Manufacturer of hexagon head screws, socket cap screws, high strength fasteners

Annual capacity of 120,000 tons

Turkey

Taiwan

Y...

Professional manufacturer in steel, alloy steel and stainless steel material.

Specialized in Hammer Head bolt, Eye bolt, DIN 938/939, any special and standard bolt.

China

Z...

Manufacturer of hammer head bolts, carriage bolts and rail fastening systems.

Suppliers of Cup head square neck bolts

Technical data

Standard DIN 603

Cup head square neck bolts

Standard UNI 5731

Standard UNI 5732

Standard ISO 8677

Standard BS 4933 7

Standard NF E27-351

Standard ISO 8678

Details