This product is regulated by the following standards:

DIN EN ISO 10642 BS 2470 3 DIN 7991 UNI 5933 BS 4168 8

Technical data

Standard DIN EN ISO 10642

Hexagon socket countersunk head screws with reduced loadability

Dimensions in mm - source Din 10642
Publication date: 02/2020 supercedes 04/2013
d thread size	P	b	dk max=nom	dk min	k max	α+2°	t min	s nom	e min
M 2	0.4	-	4.7	3.7	1.35	90°	0.75	1.3	1.454
M 2.5	0.45	-	5.88	4.8	1.69	90°	1	1.5	1.733
M 3	0.5	18	6.72	5.54	1.86	90°	1.1	2	2.303
M 4	0.7	20	8.96	7.53	2.48	90°	1.4	2.5	2.873
M 5	0.8	22	11.20	9.43	3.1	90°	1.75	3	3.443
M 6	1	24	13.44	11.34	3.72	90°	2.2	4	4.583
M 8	1.25	28	17.92	15.24	4.96	90°	2.9	5	5.723
M 10	1.5	32	22.4	19.22	6.2	90°	3.5	6	6.863
M 12	1.75	36	26.88	23.12	7.44	90°	4.3	8	9.149
M 14	2	42	30.8	26.52	8.4	90°	4.5	10	11.429
M 16	2	48	33.6	29.01	8.8	90°	4.8	10	11.429
M 20	2.5	60	40.32	35.04	10.16	90°	5.6	12	13.716

Dimensions in mm - source Din 10642
Publication date: 04/2013 supercedes 06/2004
d thread size	P	b	dk max=nom	dk min	k max	α+2°	t min	s nom	e min
M 3	0.5	18	6.72	5.54	1.86	90°	1.1	2	2.3
M 4	0.7	20	8.96	7.53	2.48	90°	1.5	2.5	2.87
M 5	0.8	22	11.20	9.43	3.1	90°	1.9	3	3.44
M 6	1	24	13.44	11.34	3.72	90°	2.2	4	4.58
M 8	1.25	28	17.92	15.24	4.96	90°	3	5	5.72
M 10	1.5	32	22.4	19.22	6.2	90°	3.6	6	6.86
M 12	1.75	36	26.88	23.12	7.44	90°	4.3	8	9.15
M 14	2	40	30.8	26.52	8.4	90°	4.5	10	11.43
M 16	2	44	33.6	29.01	8.8	90°	4.8	10	11.43
M 20	2.5	52	40.32	36.05	10.16	90°	5.6	12	13.72

Dimensions in mm - source Din 10642
Publication date: 06/2004
d thread size	P	b	dk max=nom	dk min	k max	α+2°	t min	s nom	e min
M 3	0.5	18	6.72	5.54	1.86	90°	1.1	2	2.3
M 4	0.7	20	8.96	7.53	2.48	90°	1.5	2.5	2.87
M 5	0.8	22	11.20	9.43	3.1	90°	1.9	3	3.44
M 6	1	24	13.44	11.34	3.72	90°	2.2	4	4.58
M 8	1.25	28	17.92	15.24	4.96	90°	3	5	5.72
M 10	1.5	32	22.4	19.22	6.2	90°	3.6	6	6.86
M 12	1.75	36	26.88	23.12	7.44	90°	4.3	8	9.15
M 14	2	40	30.8	26.52	8.4	90°	4.5	10	11.43
M 16	2	44	33.6	29.01	8.8	90°	4.8	10	11.43
M 20	2.5	52	40.32	36.05	10.16	90°	5.6	12	13.72

Standard BS 2470 3

Hexagon socket countersunk head screws with ISO inch (Unified) threads


Dimensions in inches - BS 2470 Table 3 - Socket Flat Countersunk Head Cap Screws
d thread size		Nr. of threads x inch		d1 min	b basic thread length	dk max theo.Sharp	k max	t min	S nom	M nom
inches	mm	UNC	UNF	d1 min	b basic thread length	dk max theo.Sharp	k max	t min	S nom	M nom
0 (0.06)	1.52	-	80	0.568	0.5	0.138	0.044	0.025	0.035	0.048
1 (0.073)	1.85	64	72	0.07	0.62	0.168	0.054	0.031	0.05	0.06
2 (0.086)	2.18	56	64	0.082	0.62	0.197	0.064	0.038	0.05	0.06
3 0.099)	2.51	48	56	0.095	0.62	0.226	0.073	0.044	0.062	0.072
4 (0.112)	2.84	40	48	0.108	0.75	0.255	0.083	0.055	0.062	0.072
5 (0.125)	3.18	40	44	0.12	0.75	0.281	0.90	0.061	0.078	0.096
6 (0.138)	3.51	32	40	0.133	0.75	0.307	0.097	0.066	0.078	0.096
8 (0.164)	4.17	32	36	0.159	0.875	0.359	0.112	0.076	0.094	0.111
10 (0.19)	4.83	24	32	0.184	0.875	0.411	0.127	0.087	0.125	0.145
1/4	6.35	20	28	0.244	1	0.531	0.161	0.111	0.156	0.183
5/16	7.94	18	24	0.305	1.125	0.656	0.198	0.135	0.188	0.216
3/8	9.53	16	24	0.368	1.25	0.781	0.234	0.159	0.219	0.251
7/16	11.11	14	20	0.429	1.375	0.844	0.234	0.159	0.25	0.291
1/2	12.70	13	20	0.492	1.5	0.938	0.251	0.172	0.312	0.372
5/8	15.88	11	18	0.616	1.75	1.188	0.324	0.220	0.375	0.454
3/4	19.05	10	16	0.741	2	1.438	0.396	0.220	0.5	0.454
7/8	22.23	9	14	0.865	2.25	1.688	0.468	0.248	0.562	-
1	25.40	8	12	0.989	2.5	1.938	0.540	0.297	0.625	-
1-1/8	28.58	7	12	1.108	2.81	2.188	0.611	0.325	0.75	-
1-1/4	31.75	7	12	1.233	3.12	2.438	0.683	0.358	0.875	-
1-3/8	34.93	6	12	1.357	3.44	2.688	0.755	0.402	0.875	-
1-1/2	38.10	6	12	1.482	3.75	2.938	0.827	0.435	1	-

Standard DIN 7991

Hexagon socket countersunk head cap screws

Dimensions in mm - source DIN 7991
Publication date: 01/1986 - Replaces DIN 7991: 01/1970 edition
d thread size	P	b (l<=125)	B (l>125<=200)	b (l>200)	dk max=nom	dk min	k max	α+2°	t max=nom	s nom	e min
M 3	0.5	12	-	-	6	5.7	1.7	90°	1.2	2	2.3
M 4	0.7	14	-	-	8	7.64	2.3	90°	1.8	2.5	2.87
M 5	0.8	16	-	-	10	9.64	2.8	90°	2.3	3	3.44
M 6	1	18	24	-	12	11.57	3.3	90°	2.5	4	4.58
M 8	1.25	22	28	-	16	15.57	4.4	90°	3.5	5	5.72
M 10	1.5	26	32	45	20	19.48	5.5	90°	4.4	6	6.86
M 12	1.75	30	36	49	24	23.48	6.5	90°	4.6	8	9.15
M 14	2	34	40	53	27	26.48	7	90°	4.8	10	11.43
M 16	2	38	44	57	30	29.48	7.5	90°	5.3	10	11.43
M 18	2.5	42	48	61	33	32.38	8	90°	5.5	12	13.72
M 20	2.5	46	52	65	36	35.38	8.5	90°	5.9	12	13.72
M 22	2.5	50	56	69	36	35.38	13.1	60°	8.8	14	16
M 24	3	54	60	73	39	38.38	14	60°	10.3	14	16

DIN 7991- ≈ mass in kg x1000 pcs, (ρ=7,85 kg/dm³) - commercial sizes
d thread size	M 3	M 4	M 5	M 6	M 8	M 10	M 12	M 14	M 16	M 18	M 20	M 22	M 24
nominal length l
6	0.41	0.77
8	0.47	0.92	1.6	2.35
10	0.56	1.07	1.85	2.7	5.47
12	0.65	1.23	2.1	3.05	6.1	10.1
16	0.83	1.53	2.59	3.76	7.35	12.1	18.2
20	1	1.84	3.09	4.46	8.6	14.1	21.2
25	1.35	2.23	3.71	5.34	10.2	16.6	24.8	32.7	45.2
30	1.63	2.9	4.33	6.22	11.7	19.1	28.5	37.6	51.8
35	1.91	3.4	5.43	7.1	13.3	21.6	32.1	42.5	58.4		91.4
40	2.19	3.9	6.2	8.83	14.8	24.1	35.7	47.4	65.1		102
45		4.4	6.97	9.91	16.4	27.1	39.35	52.3	71.75		112.5
50		5.4	7.74	11	19.9	30.1	43	57.3	78.4		123		179
55		5.9	8.51	12.08	22.35	32.9	48.5	64	85.05		133
60		6.4	9.28	13.16	24.8	35.7	54	70	91.7		143		209
65				14.24	27.25	38.45	58.45		101.3		153.5
70				15.32	29.7	41.2	62.9	82	111		164		239
75				16.3	32.3	43.95	64.85		119		182
80				17.48	34.6	46.7	71.8	94	127		200		269
90				19.61	39.5	52.2	80.7	106	143		226		299
100				21.8	44.4	57.7	89.6	118	159		253		340
110							99	130	175		278
120							108	142	191		303
130							117	154	207		328
140							126	166	223		353
150							135	178	239		378
160							144	190	255		403
170							153		271		428
180							162		287		453
190							171		303		478
200							180		319		503

Standard UNI 5933

Hexagon socket countersunk head screws - ISO metric coarse pitch thread - Product grade A

Dimensions in mm - source UNI 5933
Publication date: 06/2003
d thread size	P	b ref.	dk max=nom	dk min	k max	α+2°	t max=nom	s nom	e min
M 3	0.5	12	6	5.7	1.7	90°	1.2	2	2.3
M 4	0.7	14	8	7.64	2.3	90°	1.8	2.5	2.87
M 5	0.8	16	10	9.64	2.8	90°	2.3	3	3.44
M 6	1	18	12	11.57	3.3	90°	2.5	4	4.58
M 8	1.25	22	16	15.57	4.4	90°	3.5	5	5.72
M 10	1.5	26	20	19.48	5.5	90°	4.4	6	6.86
M 12	1.75	30	24	23.48	6.5	90°	4.6	8	9.15
M 14	2	34	27	26.48	7	90°	4.8	10	11.43
M 16	2	38	30	29.48	7.5	90°	5.3	10	11.43
M 18	2.5	42	33	32.38	8	90°	5.5	12	13.72
M 20	2.5	46	36	35.38	8.5	90°	5.9	12	13.72

Standard BS 4168 8

Hexagon socket countersunk head screws

Dimensions in mm - source BS 4168 8
Publication date: 08/1982
d thread size	P	b ref.	dk max=nom	dk min	k max	α+2°	t max=nom	s nom
M 3	0.5	18	6	5.82	1.84	90°	1.05	2
M 4	0.7	20	8	7.78	2.48	90°	1.49	2.5
M 5	0.8	22	10	9.78	3.1	90°	1.86	3
M 6	1	24	12	11.73	3.72	90°	2.16	4
M 8	1.25	28	16	15.73	4.96	90°	2.85	5
M 10	1.5	32	20	19.67	6.2	90°	3.6	6
M 12	1.75	36	24	23.67	7.44	90°	4.35	8
M 14	2	40	27	26.67	8.12	90°	4.65	10
M 16	2	44	30	29.67	8.8	90°	4.89	10
M 20	2.5	52	36	35.61	10.16	90°	5.45	12

Hexagon socket countersunk head screws

Dimensions in mm - source Din 10642
Publication date: 06/2004
d thread size	P	b	dk max=nom	dk min	k max	α+2°0	t min	s nom	e min
M 3	0.5	18	6.72	5.54	1.86	90°	1.1	2	2.3
M 4	0.7	20	8.96	7.53	2.48	90°	1.5	2.5	2.87
M 5	0.8	22	11.20	9.43	3.1	90°	1.9	3	3.44
M 6	1	24	13.44	11.34	3.72	90°	2.2	4	4.58
M 8	1.25	28	17.92	15.24	4.96	90°	3	5	5.72
M 10	1.5	32	22.4	19.22	6.2	90°	3.6	6	6.86
M 12	1.75	36	26.88	23.12	7.44	90°	4.3	8	9.15
M 14	2	40	30.8	26.52	8.4	90°	4.5	10	11.43
M 16	2	44	33.6	29.01	8.8	90°	4.8	10	11.43
M 20	2.5	52	40.32	36.05	10.16	90°	5.6	12	13.72

Full list of Suppliers of Hexagon socket countersunk head screws

Italy

DELTA OFFICINA MECCANICA SRL

Manufacturer specialized in socket head cap screws and six lobe recess screws in carbon stee. Threaded rods

Italy

Kilton S.R.L.

Company specialized in the production of fasteners and fixings for industrial applications in the following fields: automotive, home appliances, mechanical, components, building industry.

Leader in the manufacturing of special fasteners.

Thread rolling screws with hexagon washer head

Thread forming screws with round head and hexagon socket

Viti trilobate testa cilindrica impronta croce philips

Italy

La Bulloneria Pesaro Srl

Company leader in the commerce of nuts, bolts.

Range of more than 100.000 products such as screws, bolts, technical articles, industrial wheels, Tie rods for ropes and tools.

Italy

VIPA is a leading wholesaler of screws, nuts and bolts. The extensive stock of high-quality screws and bolts and the highly automated warehouse make VIPA the ideal supplier of screws, nuts and bolts with metric threads, drawing parts, special screws, washers, nuts and various fastening systems.

France

Avantage Industrie

Distributor and stockist of standard and special fasteners

Denmark

BC Technic Aps

Distributor of iron, stainless and special fasteners

Poland

Eurobolt

Polish products acc. norm DIN / ISO and drawings

Diameter: M6 to M100 (especially bigger diameter)

Materials: 5.6 / 8.8 / 10.9 / 12.9 / 25CrMo4 / 42CrMo4

Treatment: ZN / HDG (tZn) / flZnnc

EN 15048 SB sets 'CE' Made in Poland

EN 14399 HV sets 'CE' Made in Poland

Bulgaria

Kraft - Bulgaria Ltd.

Kraft Bulgaria EOOD is a leading BG company specialized in the trade of fasteners, industrial supplies, industrial armature for water, industrial, fire-frightening systems and irrigation sectors.

Our success is due to the high quality of the offered products, the professionalism and qualification of our team, as well as our flexible distribution network.

Italy

PRESSVIT S.R.L.

PRESSVIT has been on the market since 1967 and specialises in the production of special screws according to drawings. Within the company there is a dedicated machine shop area where modifications to existing equipment are made in order to allow customised machining of products according to customer requirements.

Cold forged special parts are therefore produced not only on time, but also with the utmost flexibility, as each production step is completed completely independently and according to the customer''s instructions.

France

Satinox Assemblage

Satinox Assemblage is a distributor and a manufacturer expert in fasteners. We offer a global supply solution of fasteners: sourcing, controls with our in house-lab, sub-contracting of special processes, storage, kitting and packaging, logistics and delivery.

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.

Netherlands

Triofast BV

Distributor of standard and special fasteners.

The company supplies fasteners with various types of thread: UNC, UNF, BSW and BSF. The products meet standards such as ISO, DIN, ASTM, ANSI and BS.

Austria

Weyland Steiner Handwerks & Industriebedarf GMBH

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.

Germany

Achilles Seibert GmbH

Fasteners import-export distributor, specialized in hexagon socket screws and hexagon head screws

Italy

Ambrovit S.p.A.

Distributor of hex lag screws, chipboard screws, carpentry screws, drywall screws, concrete screws, PVC windows screws, dome and euro screws, metric screws, nuts/washers/bolts/threaded rods, self-tapping screws, self-drilling screws, stainless steel screws.

China

ANHUI GOODLINK FASTENER CO. LTD.

Manufacturer of socket cap screws in steel class 12.9

Italy

ANNIBALE VITERIE SPA

Manufacturer of special cold forged screws, socket screws and screws with flange.

Size: 3 -16 mm, lengths up to 100 mm . Resistance classes from 4.8 to 12.9.

Poland

Argip sp. z o.o.

Fastener distributor, 30.000 pallet places: standard parts, elements for profiles, socket screws, prevailing torque nuts, hex bolts and nuts, rigging equipment, rivets, disc springs, washers, threaded rods.

The company has its own production line of silver & black zinc flake, nylon thread-lockers and adhesive pre-applications.

Thailand

Bangkok Fastening Co. Ltd.

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

Afghanistan

BAYKAN CIVATA

Manufacturer of standard and special screws

Germany

Böllhoff GmbH

Worldwide manufacturer of special fasteners and automatic assembly machines, wholesaler and supplier of fasteners in steel, stainless steel, brass and plastic.

The assortment includes more than 100,000 items: DIN and standard items, threaded inserts, Normteile, Gewindeeinsätze, fast fixings, adhesives and custom-special parts both in steel and plastic.

Italy

BULLONERIA BELLICINI srl

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

Clyde Fasteners Limited

Manufacturer of socket screws and Tee Slot Bolts both metric and imperial

China

Eagle Metalware Co. Ltd

Manufacturer of hex socket head cap screws, DIN 912, DIN 913, DIN 914, DIN 915, DIN 916, DIN 7991, DIN 7984, ISO 7380, anchors and auto parts, all made by cold forging.

No MOQ with 15-50 days lead time

Germany

Emil Niggeloh GmbH

Manufacturer of standard screws as per DIN and special screws as per customers request. Seizes from M 8 up to M 90

Taiwan

FkE FWU Kuang Enterprises LTD

One of the main producers of socket cap screws in haig tensile steels: 10.9 12.9 14.99

Germany

Friedrich Battenfeld

We have been a reliable supplier of standard and special fasteners for over 35 years.

We are able to produce parts on customer request.

Our strengths are the production of non-standard parts and our wide product range. We manufacture in sizes from M3 to M16.

Send us your requests.

China

Guangzhou FHEVOS metal Products Co. Ltd

Company specialized in all kinds of riveting products, such as rivet nuts, blind rivet studs, blind rivets, structural blind rivets, 'Lock Bolt' BOM® rivets and stainless steel screws, such as socket head, tapping, drilling, machine screws etc.

Poland

HSW - Fastening Elements Factory FASTEC Ltd.

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

K-Engineering Co Ltd

Manufacturer of threaded items, mainly screwed rods, engineering studs, bright bolts and sets and special items according to customer specifications

Czech Republic

Killich s.r.o.

Import/export of standard fasteners and special parts on drawing
Delivery just in time of screws, washers, nuts, anchoring systems, riveting techniques
Individual and fast service through sales representants
Fast reaction to customer demand
Quality, price, reliability, service and individual approach

Germany

Lück Schrauben GmbH Schraubenfabrik

Manufacturer of hex head and square head fasteners

India

MARUTI INTERNATIONAL

Manufacturer of screws, nuts, washers and threaded rods

Italy

Marvit Srl

Fastener distribution: Total completeness with large stock of standard products, medium/high strength items, stainless steel, brass, hot forged and turned parts. More than 50.000 items are supplied with several surface treatments.

Italy

METALVIT Srl

Manufacturer of socket and six lobes cap fasteners.

India

Micron Precision Screws Ltd

Manufacturer of socket head screws, shoulder screws and dowel pins ranging from 4mm to 40mm diameter and lengths up to 400 mm in various grades (4.6, 5.6, 8.8, 10.9, 12.9, and 14.9).

Estonia

NB Quality Group LTD

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

China

Ningbo Taida Fastener Manufacture CO.LTD.

Manufacturer of stud bolts, threaded rods, bolts and nuts.

DIN931/DIN933/DIN558 and ASTM A325 hexagon head bolts, DIN934, DIN6923, DIN985 and ASTM A 194 2H nut, DIN960, DIN961, DIN6914, DIN7990, DIN7991, DIN912, DIN7985 screws and DIN975, DIN976, ASTM A 193 B7 threaded rods, as well as other AS, GB, ISO, BS, JIS standard

Afghanistan

NORM CIVATA SANAYI ve TICARET A.S. (NORM GROUP)

Manufacturer of standard and special fasteners for automotive

Afghanistan

OBEL CIVATA SAN. ve TiC.

Manufacturer of metric and inch size fasteners

Taiwan

OFCO INDUSTRIAL CORP.

Manufacturer of hex head and cap screws

Germany

PRK TECHNOLOGIES GmbH

Distributor of dowel pins, knurled nuts and screws

RAPID INDUSTRIAL FASTENERS LTD

Distributor and manufacturer of all fasteners in all grades of material. We are ISO 9001 approved and through our machine shop manufacturing from M3 up to M100. Our markets range from Petro-Chemical through to Ministry of Defence Work.

Rcf Bolt and Nut Co Tipton Limited

Leading specialist in the manufacture and distributor of industrial fasteners, manufacturing up to M64 diameter in Mild steel & High tensile and up to M39 diameter in A2-304 & A4-316 stainless steel.

Spain

Reyza

Manufacturer of high strength resistance screws

Italy

Rosval S.r.l

Manufacturer of socket head screws, machine screws and thread rolling screws.

China

SHANGHAI PRIME MACHINERY CO.LTD

One of the largest fasteners manufacturer and exporter in China.

Hexagon and socket screws, high strength hex bolts (ASTM GR5 and GR8, DIN and ISO CL.8.8 and 10.9)

The surface plating includes Black, Zinc Bright, Zinc Yellow, Hot Dip Galvanize, Dacromet, Geomet and others.

Suppliers of Hexagon socket countersunk head screws

Technical data

Standard DIN EN ISO 10642

Standard BS 2470 3

Standard DIN 7991

Standard UNI 5933

Standard BS 4168 8

Details