Directory of GOSTs GOST 8560-78

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Classification of hexagonal rolled products according to GOCT 2879-2006 assortment

Rolled hexagonal sections are divided according to the following parameters: rolling accuracy, angle accuracy, bar curvature, type of bar length and maximum deviations for cut and multiple cut lengths.

Compliance parameters of hot-rolled steel hexagon GOST 2879-2006	Subgroups	Abbreviation for designation (also used in the symbol of hot-rolled hexagon)
According to rolling accuracy	Increased accuracy	B1, B2 (with symmetrical switches)
According to rolling accuracy	Normal accuracy	B1, B2 (with symmetrical deviations), B3 (plus deviations along the inscribed diameter).
By accuracy (bluntness) of angles	Group	BOO
By accuracy (bluntness) of angles	Group	VU
By lenght	Measured length	MD
	Measured with unmeasured length	MD1
	Length, multiple of measured	KD
	Length, multiple of measured, with unmeasured length	KD1
	Unmeasured length	ND
	Length having restrictions within unmeasured length	OD
	Length having restrictions with unmeasured length	OD1
	Steel square, supplied in coils	NMD
According to maximum length deviations (this parameter is applicable only for hexagonal rolled products of dimensional and multiple dimensions)	Group	VD
By curvature	Class	I
	Class	II
	Class	III
	Class	IV

Appearance of a set of hexagons

All types of hexagons are based on an iron rod. It is on it that the first impulse of torque falls, and therefore its strength is of great importance.

The raw materials used for its production must be reliable, resistant to destruction, and suitable for long-term use.

Size range, weight and basic geometric parameters

The size/number of a hexagonal section is determined by the diameter of the circle d inscribed in it (d is equal to the distance between parallel edges - “key size”). According to the GOCT 2879-2006 assortment, the minimum permissible size is d=8 mm, maximum d=103 mm.

Step size range of hexagonal rolled products:

for d from 8 mm to 20 mm, the step is 1 mm;
d from 20 to 30 mm, step 0.5 or 1 mm;
d from 30 to 40 mm step 1.5 or 0.5 mm;
d from 40 to 50 mm the pitch can be: 4.5 mm, 2 mm, 2.5 mm, 3 mm, 0.5 mm;
d from 50 to 103 the step is 1, 2 or 3 mm.

GOCT 2879-2006, weight of a linear meter of a steel hexagon with an inscribed circle d, mm

No. of hexagonal rolled products, d of inscribed circle, mm	Weight 1 m/linear, kg	Whole meters per ton	No. of hexagonal rolled products, d of inscribed circle, mm	Weight 1 m/linear, kg	Whole meters per ton	No. of hexagonal rolled products, d of inscribed circle, mm	Weight 1 m/linear, kg	Whole meters per ton
8	0,435	2298	18	2,203	453	67	30,518	32
9	0,551	1814	19	2,454	407	72	35,242	28
10	0,680	1470	20	2,719	367	78	41,361	24
11	0,823	1215	20,5	2,857	350	85	49,118	20
12	0,979	1021	23,5	3,754	266	88	52,646	18
13	1,149	870	28	5,330	187	90	55,066	18
14	1,333	750	42,5	12,279	81	95	61,355	16
15	1,530	653	47,0	15,017	66	98	65,291	15
16	1,740	574	55	20,565	48	100	67,983	14
17	1,965	508	60	24,474	40	103	72,123	13

The weight of a linear meter of a hexagon can also be calculated with greater accuracy using one of two formulas:

on the side of the hexagon M = 0.007850×a²×(3√3)/2 = 0.020395×a² (kg/m), where a is the side of the hexagon in millimeters;
along the radius of the inscribed circle (half the distance between any two parallel faces) = 0.007850×r²×2√3 = 0.027193×r² (kg/m), where r is the radius of the inscribed circle in millimeters.

For example, for hexagonal rolled steel No. 10, the weight of a linear meter (according to formula No. 2) is equal to:

0.027193×52 = 0.679825 kg (the rounded table value according to the product range is 0.680 kg).

The side length a(mm) of the hexagon is calculated by the formula:

a = d (mm)/√3 = d (mm)/1.73205; for example, the side of hexagonal roll No. 10 will be equal to: 10÷1.73205 = 5.8 mm.

Durable alloy for hexagon set

As a rule, all hexagons, regardless of purpose and model, are made from especially strong alloy steel. In some cases, other types of raw materials are used for this, including chrome vanadium or chrome molybdenum alloys.

The current GOST regulates a set of parameters that the raw material must meet, including its ability to withstand certain working forces.

To produce the screwdriver handle, elastic but fracture-resistant plastic is used. When casting it, a mold with recesses and protruding parts is used, which allows for a comfortable grip of the tool’s handle in the master’s palm.

Rod bent at right angles

The device of this modification is extremely simple. Structurally, it is a rectangular rod, the cross-section of which has the same value along its entire length.

In this case, the short part is necessary to give the rod a significant torque impulse according to the principle of lever action.

Density of abutment and girth

To ensure that the fixation occurs clearly and the tool does not fall off the slot, you must select a wrench attachment that will fit very tightly into the mounting slot. The same principle applies to hexagonal socket heads.

A tight fit will ensure that neither the spline nor the head of the fastener is damaged in any way.

Imbus modification of the instrument

Various modifications of hexagons are used for screwing and disconnecting various fasteners used today.

The imbus hexagon is the most primitive type of this tool. It can be used without hesitation or hesitation to work with any fastener equipped with a six-sided internal spline.

Sequencing

The sequence of work operations when disassembling a unit or assembly using a hexagon is as follows:

A hexagon is selected that completely matches the dimensions of the fasteners being removed.
The key is inserted into the slot to its full depth.
In this case, it is preferable to insert the L-shaped key with the short part in order to provide a longer lever.
A torsional force is exerted on the tool, which should increase until the moment when the screw begins to turn.

Disassembly using a hexagon

It will not be at all difficult to dismantle the part using a hexagon. It is only important not to violate the safety rules and not to strike the instrument in an attempt to increase its torque.

Selection of hexagon sizes

Hex keys and screwdrivers are produced in one and a half dozen dimensional modifications, which are regulated by the nomenclatures of ISO and ANSI standards. Currently, you can find models of instruments on sale, the working diameter of which ranges from 0.7 to 46 mm.

To effectively use a hexagon, you should choose an option that, in terms of diameter and features of the hand grip, fully corresponds to the tasks of the upcoming assembly or disassembly.

Correct choice of hexagon

Provided that the correct set of hexagons is selected, the master will have at his disposal convenient tools for any popular application, from bicycle repair to self-assembly of a desk.

In order not to get confused by the wide variety of products on the market, you need to take the following important rules as guidelines:

A professional who constantly needs such a tool should buy a set containing at least 12 types of hexagons.
In this way, he will invest his money profitably, since he will receive a full arsenal of tools for work for many years to come.
A home master can limit himself to purchasing five modifications.
They can be purchased during sales and promotions, which will provide significant savings.
You can also take a ready-made small set if the online store offers an attractive discount on it.

The most reliable are keys and screwdrivers made of special tool steel or chrome vanadium. They will work properly for decades without losing the clarity of their edges and corners.

You should not buy products from a dubious Asian brand. Inexpensive Chinese keys and screwdrivers can destroy the fasteners of furniture assembled with their help and, on top of that, break at the most inopportune moment.

Set of hexagons of all sizes

Designers of machines and mechanisms use hexagonal splines if increased force must be applied to the fastening element. To quickly achieve the intended effect, installers usually keep many keys of this type ready at once.

Most often, such a tool set contains keys of all main sizes. Purchasing a variety of different tools, including a T-hex, will allow you to use the exact key and screwdriver that exactly match the configuration of the fastener if necessary.

Practical all-rounder

At the same time, you can find a universal hexagon on the market that allows you to install fasteners of many different sizes. This type of wrench is often used to solve locksmith problems, but due to its versatility, it is applicable in almost any industry.

Repair;
Assemblies;
Packaging;
Tuning.