GOST 11871-88 Round Slotted Nuts. Technical Specifications

GOST 11871-88

Round slotted nuts. Technical specifications

ROUND SLOTTED NUTS OF PRODUCT GRADE A	GOST 11871-88
Technical specifications
Slotted round nuts , product grade A . Specifications

Effective date 01.01.89

This standard applies to round slotted nuts with a nominal thread diameter from 6 to 200 mm.

Contents

1. Basic parameters and dimensions

2. Technical requirements

3. Acceptance

4. Test methods

5. Packaging and marking

Appendix 1. Informative. Mass of steel nuts

Appendix 2. Informative. Permissible axial loads for Type 1 slotted nuts made of steel grade 35

Informational data

1. Basic parameters and dimensions

1.1. Nut dimensions shall comply with those shown in the drawing and in Table 1.

Instead of a chamfer, a rounding with radius R=c is permitted, and no chamfer is required for Type 2.

Table 1, mm

Nominal thread diameter d	Thread pitch P	D	m	D ₁	m₁	D₂	da		b	h	c, max	Number of slots n
							min	max
6	0.50	16	5	16	4	11.5	6	6.75	4	1.5	0.6	4
8	1.00	22	6	18	5	13.5	8	8.75
10	1.25	24	8	20		15.5	10	10.80
12		26		22	6	17.5	12	13.00	6
14	1.50	28		24		18.5	14	15.10		2.0
16		30		28		22.0	16	17.30
18		32		30		24.0	18	19.40			1.0
20		34		32		26.0	20	21.60
22		38	10	36	7	29.0	22	23.80		2.5
24		42		38		31.0	24	25.90
27		45		42		35.0	27	29.20
30		48		45		38.0	30	32.40
33		52		48	8	40.0	33	35.60	8	3.0
36		55		50		42.0	36	38.90
39		60		56		48.0	39	42.10
42		65		60		52.0	42	45.40
45	1.5	70		63		55.0	45	48.60				6
48		75	12	67		58.0	48	51.80		3.5
(50)		78		70		61.0	50	52.00
52		80					52	54.00	10
56	2.0	85		75		65.0	56	58.00		4.0	1.6
(58)		90		80		70.0	58	60.00
60							60	62.00
(62)		95		85		75.0	62	64.00
64							64	66.00
68		100	15	90		80.0	68	70.00
(70)							70	72.00
72		105		95	10	85.0	72	75.00
76		110					76	80.00
80		115		100		90.0	80	84.00
85		120		108		98.0	85	89.00
90		125	18	112		102.0	90	94.00	12
95		130		118		108.0	95	99.00
100	2	135		125		115.0	100	104.00
105		140		130		120.0	105	109.00
110	2	150	22	138	12	125.0	110	114.00	14	5.5
115		155		145		132.0	115	120.00
120		160		150		137.0	120	125.00
125		165		155		142.0	125	130.00
130		170		160		147.0	130	135.00				8
(135)		175	26	165		152.0	135	140.00
140		180		170		157.0	140	145.00
(145)		190		175		162.0	145	150.00			2.5
150		200		180		167.0	150	155.00	16
160	3	210		190		177.0	160	162.00
170		220	30	202		189.0	170	172.00
180		230		215	14	202.0	180	185.00		7.5
190		240		230		213.0	190	195.00
200		250		240		223.0	200	205.00

Notes:

1. By agreement between the manufacturer and the customer, nuts M45 - M125 may be made with 4 slots.

2. Nuts with dimensions shown in parentheses are not recommended for use.

Example of the designation of a Type 1 nut with thread diameter d = 16 mm, fine thread pitch 1.5 mm, thread tolerance class 6H, made of steel grade 35, with chemical oxide coating impregnated with oil:

Nut M16×1.5 - 6H.05.05 GOST 11871-88

Same, made of L63 brass, without coating:

Nut M16×1.5 - 6H.32 GOST 11871-88

Same, Type 2, with 9 µm zinc coating, chromated:

Nut 2 M16×1.5 - 6H.019 GOST 11871-88

1.2. Thread - to GOST 24705.

1.3. The theoretical mass of steel nuts is given in Appendix 1.

2. Technical requirements

2.1. Thread tolerance class - 6H to GOST 16093.

2.2. Dimensional tolerance classes and tolerances of surface location shall comply with those given in Table 2.

Angle tolerances - to GOST 8908.

By agreement between the manufacturer and the customer, nuts may be made with a perpendicularity tolerance LR of the bearing surface to the thread axis per accuracy grade 11, and surface roughness Ra: 1.6; 3.2; 6.3 instead of Ra: 0.8; 1.6; 3.2, respectively.

Table 2

Designation of dimension or tolerance	Tolerance class or tolerance
D; D₁	h22
D ₂	h24
m ;m₁	h 14
b	H14
h	H14
L r	To accuracy grade 9 of GOST 24643
L K	To accuracy grade 11 of GOST 24643

2.3. Material grades and their designations shall comply with those given in Table 3.

Table 3

Material			Brinell hardness HB, min	Grade (group) designation
type	grade	standard designation
Carbon steels	St 3 sp, St 3 kp	GOST 380	90	02
	20	GOST 1050	110	04
	35		140	05
	45		170	06
Alloy steels	35Kh	GOST 4543	197	11
	30KhGSA		217
Corrosion-resistant steels	12×18N9T 12×18N10T	GOST 5632	-	21
	14×17N2			23
Brass	L63	GOST 15527	-	32

2.4. Nuts shall be manufactured with the following coatings: chromated zinc; chromated cadmium; oxide, oil-impregnated; phosphate, oil-impregnated; or without coating. The coating selection for a specific material - to GOST 9.303. Technical requirements for coatings - to GOST 9.301.

The designation of coatings is numeric, to GOST 1759.0.

2.5. The hardness of the nut slot surfaces shall be not less than 372 HV or 38 HRC. The depth of the hardened layer shall be not less than 1 mm.

By agreement between the manufacturer and the customer, nuts may be made without heat treatment.

2.6. Surface defects of nuts - to GOST 1759.3.

3. Acceptance

Acceptance rules for nuts - to GOST 17769.

4. Test methods

4.1. Visual inspection of nuts shall be performed visually without the use of magnifying instruments, in a room with illumination of not less than 300 lx. In disputable cases, a magnifying glass with 2.5 - 3x magnification may be used.

4.2. Inspection of dimensions and surface location tolerances - to GOST 1759.1.

4.3. The hardness of heat-treated nuts shall be determined to GOST 2999 or GOST 9013. The hardness measurement to GOST 2999 is the referee method.

4.4. Surface roughness shall be checked by comparison with roughness specimens to GOST 9378.

Surface roughness may be checked using instruments. Thread roughness is checked on the side surfaces of the profile.

4.5. Inspection of defects - to GOST 1759.3.

4.6. Inspection of coatings - to GOST 9.302.

4.7. Permissible axial loads for Type 1 nuts made of steel 35 with a nominal thread diameter up to 48 mm are given in Appendix 2.

5. Packaging and marking

Packaging of nuts and marking of containers - to GOST 18160.

Appendix 1. Informative

Mass of steel nuts

Nominal thread diameter d, mm	Theoretical mass of 1000 nuts, kg
	Type 1	Type 2
6	5.337	4.215
8	12.154	6.727
10	19.812	8.025
12	21.665	10.695
14	22.951	11.359
16	26.690	16.423
18	29.094	18.147
20	31.669	19.826
22	50.674	30.001
24	63.426	32.306
27	69.409	39.148
30	75.604	42.770
33	81.455	50.319
36	85.436	49.408
39	107.806	68.888
42	127.185	79.049
45	151.126	80.806
48	195.479	88.563
(50)	216.636	101.291
52	211.034	88.725
56	229.868	99.809
(58)	274.306	126.064
60	257.161	114.609
(62)	304.114	142.540
64	285.786	130.295
68	412.709	146.870
(70)	387.599	133.442
72	450.819	208.223
76	450.313	169.487
80	491.471	190.468
85	545.955	241.047
90	696.424	237.176
95	740.824	264.448
100	794.727	308.241
105	830.778	323.058
110	1195.489	439.750
115	1264.874	496.593
120	1315.300	517.529
125	1365.726	538.464
130	1389.556	544.893
(135)	1734.891	565.829
140	1795.497	586.764
(145)	2062.732	607.699
150	2319.784	620.345
160	2495.855	691.299
170	3328.462	793.840
180	3546.021	1081.209
190	3516.727	1259.375
200	4106.613	1324.895
-	-	-

Note. To determine the mass of nuts made of brass, the mass values given in the table shall be multiplied by a factor of 1.080.

Appendix 2. Informative

Permissible axial loads for Type 1 slotted nuts made of steel grade 35

Nominal thread diameter d, mm	Thread pitch P, mm	Test load H, min
6	0.5	13200
8	1.0	23500
10	1.25	36700
12		37200
14	1.5	42800
16		50000
18		57200
20		65200
22		90000
24		96600
27		105000
30		123100
33		135000
36		155700
39		158000
42		161800
45		180000
48		240750

Informational data

1. Developed and submitted by the Ministry of Machine Tool and Tool Industry of the USSR.

2. Approved and put into effect by Resolution No. 1395 of the USSR State Committee for Standards dated 20.05.88.

3. The standard fully complies with ST SEV 5957-87.

4. Supersedes GOST 11871-80.

5. Referenced regulatory and technical documents

Designation of the referenced regulatory document	Clause number
GOST 9.301-86	2.4
GOST 9.302-88	4.6
GOST 9.303-84	2.4
GOST 380-94	2.3
GOST 1050-88	2.3
GOST 1759.0-87	2.4
GOST 1759.1-82	4.2
GOST 1759.3-83	2.6, 4.5
GOST 2999-75	4.3
GOST 4543-71	2.3
GOST 5632-72	2.3
GOST 8908-81	2.2
GOST 9013-59	4.3
GOST 9378-93	4.4
GOST 15527-2004	2.3
GOST 16093-2004	2.1
GOST 17769-83	3
GOST 18160-72	5
GOST 24643-81	2.2
GOST 24705-2004	1.2

6. Reprinted 2006.

Corresponds to DIN 546.