MF FASTENER INDUSTRIES LLC Manufacturer of anchor bolts, studs & plate washers · Importer & stockist of fasteners

Technical datasheet DIN 933 / ISO 4017 — Hexagon head bolt, full thread

Reference only — for design, verification or contractual purposes refer to the current issue of the original standard. MF Fastener Industries LLC · sales@mfindllc.com · +971 6 767 2469 · mfindllc.com

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Dimensional datasheet

DIN 933 hex bolt

Hexagon head bolt, threaded to the head. Metric coarse thread. Superseded for most current production by ISO 4017 — the difference is noted below and it matters at M10 and M12.

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d nominal thread diameters width across flatse width across cornersk head heightl length under headb thread length

Dimensions

millimetres

Nominal dimensions for metric coarse thread. Tolerances to the product grade stated on the order. Figures follow ISO 4017; where DIN 933 differs, both are shown.

Size	Pitch	s — across flats	Spanner size	e — across corners	k — head height	Standard lengths
M6	1.00	10.00	10 mm	11.05	4.00	10 – 60
M8	1.25	13.00	13 mm	14.38	5.30	12 – 80
M10	1.50	16.00 (DIN 17.00)	16 mm / 17 mm	17.77	6.40	16 – 100
M12	1.75	18.00 (DIN 19.00)	18 mm / 19 mm	20.03	7.50	20 – 120
M16	2.00	24.00	24 mm	26.75	10.00	25 – 150
M20	2.50	30.00	30 mm	33.53	12.50	30 – 200
M24	3.00	36.00	36 mm	39.98	15.00	40 – 200
M30	3.50	46.00	46 mm	50.85	18.70	50 – 200
M36	4.00	55.00	55 mm	60.79	22.50	60 – 200

M10 and M12 — check before you order

DIN 933 originally specified 17 mm across flats at M10 and 19 mm at M12. ISO 4017 specifies 16 mm and 18 mm. Most current production follows ISO.

That means two different spanner sizes for the same nominal bolt. A fitter carrying a 16 mm spanner cannot turn a DIN-dimensioned M10.

If you are replacing bolts in an existing assembly, or your spanner sizes are fixed, say which you need on the order. We will confirm what is in stock before shipping.

Property classes

ISO 898-1

Class	Tensile strength Rm min	Yield Rp0.2 min	Hardness HV	Typical use
4.6	400 N/mm²	240 N/mm²	120 – 220	General, non-structural
5.6	500 N/mm²	300 N/mm²	155 – 220	General engineering
8.8	800 N/mm²	640 N/mm²	250 – 320	Structural and machine
10.9	1040 N/mm²	940 N/mm²	320 – 380	High duty
12.9	1220 N/mm²	1100 N/mm²	385 – 435	Highest duty, tool joints

Values for sizes up to M39. Property class is marked on the head. Classes 10.9 and 12.9 are susceptible to hydrogen embrittlement where electroplated — specify the coating at order stage so it can be baked correctly.

At a glance

Standard	DIN 933 · ISO 4017 · BS EN ISO 4017
Head	Hexagon
Thread	Full, to the head
Thread form	Metric coarse, ISO 68-1
Tolerance	6g as standard
Part threaded version	DIN 931 · ISO 4014
Matching nut	DIN 934 · ISO 4032
Matching washer	DIN 125A · ISO 7089

Supply

Imported and held in stock. Sourced from established mills in Europe, China, India and the Far East and supplied from our warehouse in Umm Al Quwain.

Anchor bolts, studs and plate washers are manufactured at our own plant. This item is not.

Materials and finish

Carbon steel	Plain, zinc plated, hot-dip galvanized
Stainless	A2-70, A4-80
High tensile	8.8, 10.9, 12.9
Certification	Mill certificate against lot and heat number

Testing

Dimensional and thread inspection is carried out in our own plant on calibrated instruments. Tensile, hardness and chemical testing is carried out by independent UAE-accredited laboratories.

Reference only

This datasheet is published for reference. Dimensions and property values are reproduced in good faith from published standards, but for design, verification or contractual purposes always refer to the current issue of the original standard.

If a figure here conflicts with the standard, the standard governs.

Need a quotation?

Send the size, length, property class, coating and quantity. If you are unsure which standard applies, send the drawing and we will confirm.