GOST 1759.1-82 Bolts, screws, studs, nuts and wood screws. Tolerances. Methods of control of dimensions and deviations of form and location of surfaces

GOST 1759.1-82 establishes tolerances and methods for controlling dimensions, as well as form and position deviations of surfaces, for general-purpose engineering bolts, screws, studs, nuts and wood screws with threads from M1 to M48.

Designation of the referenced regulatory document	Clause number
GOST 8.010-90	3.1
GOST 10753-86	3.6
GOST 11284-75	3.4; 3.12
GOST 12414-94	2.1
GOST 19256-73	2.1
GOST 24997-81	3.2
GOST 25069-81	2.3
GOST 25670-83	2.2

Bolts, Screws, Studs, Nuts and Wood Screws TOLERANCES Control methods of dimensions and deviations of form and surface position Bolts, screws, studs and nuts. Tolerances. Control methods of dimensions and deviations of form and surface position	GOST 1759.1-82

Effective date 01.01.83.

This standard applies to general-purpose engineering bolts, screws, studs and nuts with threads from M1 to M48, as well as to wood screws and self-tapping screws (except for their thread dimensions), and establishes three product grades — A, B, C — and methods for controlling dimensions and deviations of form and surface position for them.

This standard fully complies with ST SEV 2651-80.

1. THREAD TOLERANCE FIELDS

1.1. Tolerance fields for external and internal threads shall comply with those specified in Table 1.

Until 1 January 1990, for grade A and B products of the first quality category, thread tolerance fields corresponding to grade C were permitted.

1.2. For applying metallic coatings of increased thickness, thread tolerance fields not listed in Table 1 may be used.

Table 1

mm

Thread	Thread tolerance field for fasteners of product grade			Notes
	A	B	C
External	6 g	6 g	8 g	-
Internal	6H	6H	7H	1. For nuts from M3 with height m³0.8d, internal diameter tolerances shall be maintained over a length t₁³0.5t. 2. For nuts with height 0.5d£m<0.8d, internal diameter tolerances shall be maintained over a length t₂³0.35t. 3. For self-locking nuts, the internal diameter may exceed the permissible values over a length t₃£0.35t from the loaded end face.

2. TOLERANCES OF DIMENSIONS, FORM AND POSITION OF SURFACES

2.1. Dimensional tolerances, position tolerances and combined form-and-position tolerances of surfaces shall comply with those specified in Table 2.

Table 2

mm

Fasteners or their elements	Designation of dimension or tolerance	Name of dimension or tolerance	Designation of the dimension used to determine the numerical value of the position tolerance	Tolerance fields and tolerances for products of grade
				A	B	C
1. Hex heads	s	Width across flats	-	h23 at S£32 h24 » S>32	h24 at S£19 h25 » 19<S£60 h26 » S>60
	k	Head height	-	js14	js15		js16 at k<10 js17 » k³10
	e	Circumscribed circle diameter	-	e³1.13Smin
	Ls	Symmetry tolerance of the head relative to the shank axis, expressed as a diameter	S	2IT13	2IT14		2 IT 15
	Lp	Parallelism tolerance of the faces relative to the shank axis	k	0.0175k (corresponds to 1°)	0.0349k (corresponds to 2°)
	LR	Perpendicularity tolerance of the bearing surface of the head relative to the shank axis	S	For bolts with d£M30
				0.0175 ´ 0.85S (corresponds to 1°) For bolts with d>N			0.0349 ´ 0.8S (corresponds to 2°)
				For bolts with d>M30
				0.0087 ´ 0.8S (corresponds to 0°30′)		0.0175 ´ 0.8S (corresponds to 1°)
2. Cylindrical heads	D	Head diameter	-	h12	h14	h15
	k	Head height	-	h13 at d£M5 h14 at d>M5	h14	h15
	Lk	Coaxiality tolerance of the head relative to the shank axis, expressed as a diameter	D	2IT13	2IT14	2 IT 15
	LR	Perpendicularity tolerance of the bearing surface of the head relative to the shank axis	D	0.0175 ´ 0.8D (corresponds to 1°)		0.0349 ´ 0.8D (corresponds to 2°)
3. Square heads	S	Width across flats	-	h13	h14	-
	k	Head height	-	js14	js15	-
	e	Circumscribed circle diameter	-	h16		-
	d₁	Flange diameter	-	h15		-
	k₁	Collar height	-	h14		-
	Ls	Symmetry tolerance of the head relative to the shank axis, expressed as a diameter	S	2IT13	2IT14	-
	LR	Perpendicularity tolerance of the bearing surface of the collar relative to the shank axis	d₁	0.0175 ´ 0.8d₁ (corresponds to 1°)		-
4. Countersunk heads	D	Head diameter	-	h14		h15 for heads with a slot; js16 for heads without a slot
	LB	Runout tolerance in a specified direction	D	2IT13	2IT14	2 IT 15
	LR	Perpendicularity tolerance of the head face relative to the shank axis	D	0.0175 ´ 0.8D (corresponds to 1°)		0.0349 ´ 0.8D (corresponds to 2°)
	a	Countersink angle	-	+2°	+3°	+5°
5. Raised countersunk heads	D	Head diameter	-	h14		h15 for heads with a slot; js16 for heads without a slot
	LB	Runout tolerance in a specified direction	D	2IT13	2IT14	2 IT 15
	a	Countersink angle	-	+2°	+3°	+5°
6. Round heads	D	Head diameter	-	h14	js15	js16
	k	Head height	-	js14	±0.08 at k≤1; js15 at k>1	js16
	Lk	Coaxiality tolerance of the head relative to the shank, expressed as a diameter	D	2IT13	2IT14	2 IT 15
	LR	Perpendicularity tolerance of the bearing surface of the head relative to the shank axis	D	0.0175 ´ 0.8D (corresponds to 1°)		0.0349 ´ 0.8D (corresponds to 2°)
7. Rolled heads	D	Head diameter	-	h15		-
	d₁	Sub-head diameter	-	h14		-
	h	Head height with sub-head	-	h15		-
	k	Head height without sub-head	-	h14	h15	-
	Lk	Coaxiality tolerance of the head relative to the shank, expressed as a diameter	D	2IT13	2IT14	-
8. Special head features	v	Lug width	-	-	-	h16
	v	Side dimension of the square sub-head	-	-	-	js16
9. Slot and cross recess for all head types and for set screws	n	Slot width	-	C13 at n£1 C14 » n>1
	Ls	Symmetry tolerance of the slot relative to the shank axis, expressed as a diameter	d	2IT13	2IT14
10. Hex socket for all head types and for set screws	S	Width across flats of the hex socket	-	D11 (for set screws) D12	D12 at S<12 D13 » S³12		-
	e	Circumscribed circle diameter	-	e ≥ 1.14Smin
	Ls	Tolerance of symmetry of the hex socket relative to the shank axis, in diametral terms	d	2IT13	2IT14	-
11. Set screw points	Lk	Tolerance of coaxiality of the cylindrical pin relative to the thread, in diametral terms	d	2IT13	2IT14	-
	LB	Tolerance of runout in a specified direction of the external or internal cone relative to the thread axis	d	2IT13	2IT14	-
	LR	Tolerance of perpendicularity of the end face of the cylindrical pin relative to the thread axis	d₁	0.0175 × 0.8 d₁ (corresponds to 1°)		-
12. Bolt and screw shanks	d₁	Diameter of the plain part of the shank, equal to the nominal thread diameter	-	h13	h14	h15
	l	Shank length	-	js15	js17	js17 for l ≤ 150; 2js17 for l > 150
	b	Thread length	-	plus 2 thread pitches (+2P)
	L₁	Distance from the bearing surface of the head to the axis of the hole in the shank	-	+ IT 14
	d₃	Diameter of the hole in the shank	-	H14
	Ls or LA	Tolerance of symmetry of the hole in the shank relative to the thread axis, in diametral terms, or tolerance of intersection of the thread and shank-hole axes, in diametral terms	d	2IT13	2IT14		2 IT 15
	Lk	Tolerance of coaxiality of the thread and shank, in diametral terms	d	2IT13	2IT14		2 IT 15
	LR	Tolerance of perpendicularity of the shank-hole axis relative to the thread axis	d	0.025d			0.05d
13. Studs	d₁	Diameter of the plain part of the stud	-	h13	h14		±IT15
	l	Stud length	-	js15	js17		js17 for l ≤ 150; ±IT17 for l > 150
	b	Length of the nut end	-	plus 2 thread pitches (+2P)
	b₁	Length of the screw-in end	-	js16	js17
	Lk	Tolerance of coaxiality of the nut end and the screw-in end, in diametral terms	-	2IT13	2IT14		21 T 15
14. Hexagon nuts	S	Width across flats	-	h13 for S ≤ 32; h14 for S > 32	h14 for S ≤ 19; h15 for 19 < S ≤ 60; h16 for S > 60
	m	Nut height	-	h13 for m < 1; h14 for m ≥ 1	h16		h17
	m₁	Distance from the bearing surface to the base of the crown	-	h14	h16		h17
	h	Height of the castle nut	-	h14	h16		h17
	f	Distance from the bearing surface to the base of the slot	-	h14	h16		h17
	n	Slot width	-	H14			H15
	D₂	Crown diameter	-	h14	h15		h16
	e	Circumscribed circle diameter	-	e³1.13Smin
	LS1	Tolerance of symmetry of the hexagon (width across flats) relative to the hole axis, in diametral terms	S	2IT14			2IT15
	LS2	Tolerance of symmetry of the slot relative to the thread axis, in diametral terms	d	2IT13	2IT14		2 IT 15
	LR1	Tolerance of perpendicularity of the faces relative to the bearing surface of the nut	m	0.0175m (corresponds to 1°)	0.0349m (corresponds to 2°)
	LR₂	Tolerance of perpendicularity of the bearing surfaces of the nut relative to the thread axis	S	0.0175 ´ 0.8S (corresponds to 1°)	0.0262 × 0.8S (corresponds to 1°30′)		0.0349 ´ 0.8S (corresponds to 2°)
15. Round nuts	m	Nut height	-	h14	h16		js16
	D	Nut diameter	-	h14			h15
	LR	Tolerance of perpendicularity of the bearing surfaces of the nut relative to the thread axis	D	0.0175 ´ 0.8D (corresponds to 1°)			0.0349 ´ 0.8D (corresponds to 2°)
	Lk	Tolerance of coaxiality of the outer cylinder relative to the hole, in diametral terms	D	2IT14			2IT15
16. Square nuts	S	Width across flats	-	h13 for S ≤ 32; h14 for S > 32	h14 for S ≤ 19; h15 for 19 < S ≤ 60; h16 for S > 60
	m	Nut height	-	h14	h15 for m ≤ 30; h16 for m > 30		h14
	e	Circumscribed circle diameter	-	e³ 1.3Smin
	LS	Tolerance of symmetry of the square (width across flats) relative to the hole axis, in diametral terms	S	2IT14			2IT15
	LR1	Tolerance of perpendicularity of the faces relative to the bearing surface	m	0.0175m (corresponds to 1°)	0.0349m (corresponds to 2°)
	LR₂	Tolerance of perpendicularity of the bearing surfaces of the nut relative to the thread axis	S	0.0175 ´ 0.8S (corresponds to 1°)	0.0262 × 0.8S (corresponds to 1°30′)		0.0349 × 0.8S (corresponds to 2°)

Notes:

1. The datum is either the plain surface or the threaded surface of the shank only. The datum length equals d. The datum length on the plain part of the shank may be reduced to three thread pitches (3P) if the length of the plain part is less than d.

2. For bolts and screws with flanges (collars), as well as for products whose hexagon head is formed by cold heading without a trimming operation, the circumscribed circle diameter e ≥ 1.12Smin.

3. When the thread is formed by rolling without reduction, the limit deviations of the diameter of the plain part of the shank shall be as per GOST 19256.

4. Tolerances for the dimensions of set screw points are given in GOST 12414.

(Amended edition, Amendment No. 1).

When determining tolerances of perpendicularity and parallelism of surfaces, the nominal values of the corresponding dimensions are substituted into the formulas of Table 2, and the resulting tolerance values are rounded to the second decimal place.

Note. The numerical values of the tolerances and limit deviations corresponding to the tolerance and tolerance-field designations used in the text and in Table 2 of the standard are given in the informative annex.

2.2. Unspecified limit deviations of dimensions shall be as per GOST 25670: tolerance class “medium” for product grade A and B items; tolerance class “very coarse” for product grade C items.

(Amended edition, Amendment No. 1).

2.3. Unspecified tolerances of form and position of surfaces shall be as per GOST 25069.

(Introduced additionally, Amendment No. 1).

3. INSPECTION METHODS

3.1. The dimensions and position of surfaces of products shall be inspected using general-purpose measuring instruments, limit gauges, templates, control matrices and other means verified together with the measurement procedures in accordance with the procedure established by GOST 8.010 (GOST R 8.563-96 is in effect on the territory of the Russian Federation).

When inspecting the dimensions of products, tolerances and limit deviations specified to an accuracy of 0.001 mm shall be rounded to 0.01 mm.

Dimensions not limited by limit deviations are not inspected. Their achievement shall be ensured by the manufacturing process.

3.2. Thread dimensions shall be checked using limit gauges in accordance with GOST 24997.

It is permissible for the NOT GO gauge to be screwed on (screwed in) without passing through:

the cotter pin hole in shank-type products;

the incomplete end threads;

the slots in slotted and castle nuts.

It is permissible to screw on (screw in) the GO plug gauge using a torque wrench with a torque equal to 0.06dv N×m.

3.3. The width across flats and the circumscribed circle diameter of the hexagon and square, as well as the diameter of the cylindrical head of the screw, shall be inspected in the middle (by height) part of the nut or head of the product, over a section equal to half their height.

(Amended edition, Amendment No. 1).

3.4. The height of the countersunk head shall be measured using the fixture shown in Fig. 1. The dimensions of the yoke and sleeve shall correspond to the fastener with nominal size d, angle a and maximum size k.

The diameter of the hole in the control sleeve shall be taken from the 2nd series of GOST 11284.

Other inspection methods are permitted.

(Amended edition, Amendment No. 1).

3.5. The depth and width of the straight slot in products shall be measured along the shank axis, with the slot width determined at its base.

3.6. Inspection of cross recesses shall be in accordance with GOST 10753.

3.7. The length of a bolt, screw or stud with an oblique shank-end cut shall be checked along the longer side of the shank.

3.8. The deviation from symmetry L′s of hexagon and square heads relative to the shank axis, the deviation from coaxiality L′k of round heads relative to the shank, the deviation from symmetry L′s of the hexagon and square relative to the hole axis in the nut, and the deviation from coaxiality L′k of the outer cylinder relative to the hole in a round nut, in accordance with Fig. 2, shall be determined by the formula

L¢s(L¢k) = f₁ - f₂.

1 - gauge sleeve; 2 - gauge yoke or indicator

Fig. 1

Fig. 2

3.9. The deviation from perpendicularity of the bearing surface of the bolt or screw head relative to the shank axis shall be checked with a feeler gauge, measuring the gap between the bearing surface of the head and the end surface of the control matrix. The diameter of the hole in the control matrix shall be made to tolerance field D11, and the height of the matrix shall be not less than two shank diameters of the product.

Perpendicularity deviation of the nut’s bearing surfaces relative to the thread axis is checked with a feeler gauge, by measuring the gap between each bearing surface of the nut and the end face of the control ring, both screwed onto a threaded mandrel until they contact each other. The thread accuracy of the control ring and mandrel shall correspond to the thread accuracy of the part being checked.

Checking the perpendicularity deviation of bearing surfaces of parts by the value of face runout, measured with indicator instruments, is permitted.

(Amended edition, Amendment No. 1).

3.9a. The perpendicularity deviation of the hexagon and square faces of the nut relative to the bearing surface is checked with an angular gauge.

Checking the perpendicularity of the faces by measuring radial runout with indicator instruments is permitted.

(Introduced additionally, Amendment No. 1).

3.10. The symmetry deviation L′s of the slot or hexagon socket (hex socket) relative to the shank axis, in accordance with Fig. 3, shall be determined by the formula

L¢s = f₁ - f₂

Fig. 3

3.11. The symmetry deviation of the slots in castle nuts and slotted nuts relative to the thread axis is checked with a gauge (Fig. 4), the thread of which shall be made to the dimensions of the GO gauge for the nut being checked, with the pin diameter equal to the nominal diameter of the cotter pin.

Fig. 4

The shape of the slot bottom is not checked.

The width of the gauge slot shall be equal to the pin diameter plus the symmetry tolerance of the nut slot relative to the axis, expressed in diametral terms.

(Amended edition, Amendment No. 1).

3.12. The straightness deviation of studs and shanks of bolts and screws is checked indirectly, by the free entry of the shank into a control die and rotation of the part within it about its axis through one full turn. The hole in the die shall be made to the first series of GOST 11284 for bolts, screws and studs of product grades A and B, and to the second series for bolts of product grade C; the depth (length) of the hole in the die shall be not less than the length of the shank of the part being checked.

Checking the straightness deviation of the shank by rolling it through a slot, the length of which is not less than the length of the shank and the width (height) of which equals the diameter of the hole in the control die, is permitted.

Appendix

For reference

NUMERICAL VALUES OF TOLERANCES AND LIMIT DEVIATIONS CORRESPONDING TO TOLERANCE ZONES

mm

Size ranges	Tolerances				Shaft tolerance zones
	IT13	IT14	IT15	IT17	h12	h13	h14	h15	h16	h17
Less than 1	-	-	-	-	-	0 -0.14	-	-	-
From 1 to 3	0.14	0.25	0.40	1.0	0 -0.10	0 -0.14	0 -0.25	0 -0.40	0 -0.60	0 -1.0
Over 3 to 6	0.18	0.30	0.48	1.2	0 -0.12	0 -0.18	0 -0.30	0 -0.48	0 -0.75	0 -1.2
» 6 » 10	0.22	0.36	0.58	1.5	0 -0.15	0 -0.22	0 -0.36	0 -0.58	0 -0.90	0 -1.5
» 10 » 18	0.27	0.43	0.70	1.8	0 -0.18	0 -0.27	0 -0.43	0 -0.70	0 -1.10	0 -1.8
» 18 » 30	0.33	0.52	0.84	2.1	0 -0.21	0 -0.33	0 -0.52	0 -0.84	0 -1.30	0 -2.1
» 30 » 50	0.39	0.62	1.00	2.5	0 -0.25	0 -0.39	0 -0.62	0 -1.00	0 -1.60	0 -2.5
» 50 » 80	0.46	0.74	1.20	3.0	0-0.30	0 -0.46	0 -0.74	0 -1.20	0 -1.90	0 - 3 , 0
» 80 » 120	0.54	0.87	1.4	3.5	0 -0.35	-	-	0 -1.40	-	0 -3.5
» 120 » 180	0.63	1.00	1.6	4.0	-	-	-	-	-	0 -4.0
» 180 » 250	0.72	1.15	1.85	4.6	-	-	-	-	-	0 -4.6
»250 » 315	0.81	1.30	2.10	5.2	-	-	-	-	-	0 -5.2

Continued

mm

Size ranges	Shaft tolerance zones				Hole tolerance zones
	js14	js15	js16	js17	H14	H15	C13	C14	D11	D 12	D 13
Less than 1	-	-	-	-	-	-	+0.20 +0.06	-	-	-	-
From 1 to 3	±0.125	±0.200	±0.300	±0.50	+0.25 0	+0.40 0	+0.20 +0.06	+0.31 +0.06	+0.080 +0.020	+0.120 +0.020	+0.160 +0.020
Over 3 to 6	±0.150	±0.240	±0.375	±0.60	+0.30 0	+0.48 0	-	+0.37 +0.07	+0.105 +0.030	+0.150 +0.030	+0.210 +0.030
» 6 » 10	±0.180	±0.290	±0.450	±0.75	+0.36 0	+0.58 0	-	-	+0.130 +0.040	+0.190 +0.040	+0.260 +0.040
» 10 » 18	±0.215	±0.350	±0.550	±0.90	-	+0.70 0	-	-	+0.160 +0.050	+0.230 +0.050	+0.320 +0.050
» 18 » 30	±0.260	±0.420	±0.650	±1.05	-	+0.84 0	-	-	-	+0.275 +0.065	+0.395 +0.065
» 30 » 50	±0.310	±0.500	±0.800	±1.25	-	+ 1.00 0	-	-	-	+0.330 +0.080	+0.470 +0.080
» 50 » 80	±0.370	±0.600	±0.950	±1.50	-	+ 1.20 0	-	-	-	-	+0.560 +0.100
» 80 » 120	±0.435	±0.700	±1.100	±1.75	-	-	-	-	-	-	+0.660 +0.120
» 120 » 180	±0.500	±0.800	±1.250	±2.00	-	-	-	-	-	-	-
» 180 » 250	±0.575	±0.925	±1.450	±2.30	-	-	-	-	-	-	-
»250 » 315	±0.650	±1.050	±1.600	±2.60	-	-	-	-	-	-	-