Furniture Bolt DIN 603

DIN 603 is a furniture bolt with a round head, a cylindrical threaded shank and a square neck under the head. Metric thread is cut over a third of the shank length.

Specifications of DIN 603 furniture bolts

The bolt solves two tasks: joining furniture components and preserving the aesthetic appearance of the surface. The smooth round head does not protrude above the plane and does not spoil the furniture’s appearance, while the threaded section provides a secure fixing during assembly.

Bolts are made of carbon steel with a zinc-plated coating, brass, chromium-nickel alloys (A2 and A4), other metals and engineering plastic. The product provides a strong connection and an attractive appearance of furniture items at all stages of assembly and subsequent use.

The range includes two main product types:

1. Bolts with a square neck — the square neck prevents the fastener from turning when the nut is tightened.
2. Bolts with a concealed head — the head does not protrude above the plane of the part and can be hidden under decorative plastic, metal or wood covers.

The heads of these bolts are smooth, without slots or recesses. Fixing is done with nuts on the threaded shank side.

The fastener is used for joining furniture components (tables, sofas, armchairs). The bolts retain their appearance and corrosion resistance over a long service life, even as the furniture components they join wear.

DIN 603 equivalents

Products manufactured to DIN 603 meet the requirements of EN ISO 8677 and GOST 7802-81.

Dimensions and design are reflected in the designation. For example, the designation M12×60.36.016 under GOST 7802-81 means:

• shank diameter at the thread (d) — 12 mm;
• metric coarse-pitch thread, tolerance up to 8g;
• overall length of the item (l) — 60 mm.

Carbon steel bolts are supplied with a zinc coating at least 6 µm thick, applied by cathodic reduction. The coating protects the metal from moisture in the air and in the joined parts.

Fasteners made of non-ferrous metals, alloys and plastic do not require anti-corrosion protection and more often serve a decorative function.

Scope of application

DIN 603 is used not only for assembling household and industrial furniture, but also in construction, repair work and household needs — wherever wood, plywood or plasterboard parts need to be joined.

Bolts with a smooth head are also used in mechanical engineering, instrument making and other industries.

Where to buy DIN 603?

FLOK supplies fasteners meeting the requirements of GOST 7802-81, in various diameters, lengths and materials.

Specification and dimension table for DIN 603 round-head furniture bolts, in mm

d₁		M5	M6	M8	M10	M12	M16	M20
P		0.8	1	1.25	1.5	1.75	2	2.5
d₂		13.5	16.55	20.65	24.65	30.65	38.8	46.8
k		3.3	3.88	4.88	5.38	6.95	8.95	11.05
f		4.1	4.6	5.6	6.6	8.75	12.9	15.9
V		5.48	6.48	8.58	10.58	12.7	16.7	20.84
b	L ≤ 125	16	18	22	26	30	38	46
	125 < L ≤ 200	22	24	28	32	36	44	52
	L > 200	-	-	41	45	49	57	65
L		Weight of 1000 pcs. of bolts, kg
		M5	M6	M8	M10	M12	M16	M20
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			22.8	40.8	63.7	96	181	297
100			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

Designations:

d₁ - nominal thread diameter

P - thread pitch

d₂ - diameter of the round head

k - head height

f - neck height, min.

V - side size of the square neck

b - length of the threaded part

L - bolt length