ISO4032 Hexagon Nuts Specification

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ISO4032 Hexagon Nuts Specification-NINGBO BOLT

ISO4032 Hexagon Nuts

ISO 898-2 Specification

This part of ISO 898 specifies mechanical and physical properties of nuts with coarse thread and fine pitch thread made of carbon steel and alloy steel when tested at an ambient temperature range of 10 °C to 35 °C. Nuts conforming to the requirements of this part of ISO 898 are evaluated at that ambient temperature range. It is possible that they do not retain the specified mechanical and physical properties at elevated and/or lower temperatures.

ISO 898-2 Chemical Composition

Thread	Property class		Material and nut heat treatment	Chemical composition limit (cast analysis %)
Thread	Property class		Material and nut heat treatment	c max.	Mn min.	p max.	s max.
Coarse thread	04C		Carbon steel, d	0.58	0.25	0.060	0.150
	osc		Carbon steel, QTe	0.58	0.30	0.048	0.058
	Sb		Carbon steel, d	0.58	-	0.060	0.150
	Sb		Carbon steel, d	0.58	-	0.060	0.150
	8	Highnut (style 2)	Carbon steel, d	0.58	0.25	0.060	0.150
	8	Regular nut (style 1) D s M16	Carbon steel, d	0.58	0.25	0.060	0.150
	3c	Regular nut (style 1) D > M16	Carbon steel, QTe	0.58	0.30	0.048	0.058
	9		Carbon steel, d	0.58	0.25	0.060	0.150
	1oc		Carbon steel, QTe	0.58	0.30	0.048	0.058
	12c		Carbon steel, QTe	0.58	0.45	0.048	0.058
Fine pitch thread	04b		Carbon steel, d	0.58	0.25	0.060	0.150
	osc		Carbon steel, QTe	0.58	0.30	0.048	0.058
	5b		Carbon steel, d	0.58	-	0.060	0.150
	5b	D SM16	Carbon steel, d	0.58	-	0.060	0.150
	5b	D > M16	Carbon steel; QTe	0.58	0.30	0.048	0.058
	8	High nut (style 2)	Carbon steet, d	0.58	0.25	0.060	0.150
	3c	Regular nut (style 1)	Carbon steel, QTe	0.58	0.30	0.048	0.058
	1oc		Carbon steel, QTe	0.58	0.30	0.048	0.058
	12C		Carbon steel, QTe	0.58	0.45	0.048	0.058

Note:

QT = Quenched and tempered nuts.
“—“ No limit specified.
a. In case of dispute, the product analysis applies.
b. Nuts of these property classes may be manufactured from free-cutting steel upon agreement between the purchaser and the manufacturer; in such a case, sulfur, phosphorus and lead are permissible with the following maximum contents: S: 0,34 %; P: 0,11 %; Pb: 0,35%.
c. Alloying elements may be added, provided the mechanical properties required in Clause 7 are fulfilled.
d. This may be quenched and tempered at the manufacturer’s discretion.
e. For materials of these property classes, there shall be sufficient hardenability to ensure a structure consisting of approximately 90 % martensite in the “as-hardened” condition before tempering in the threaded area of the nut as specified in Figure 3.

ISO 898-2 Mechanical properties

Proof load values for nuts with coarse thread

Thread D	Pitch p	Proof load a, N Property class
Thread D	Pitch p	04	05	5	6	8	9	10	12
M5	0.8	5400	7 100	8250	9 500	12 140	13000	14800	16 300
M6	1.0	7 640	10 000	11 700	13 500	17 200	18400	20 900	23100
M7	1.0	11 000	14500	16 800	19 400	24 700	26 400	30 100	33200
MS	1.25	13900	18300	21 600	24 900	31800	34 400	38 100	42 500
M10	1.5	22 000	29 000	34 200	39 400	50 500	54 500	60 300	67 300
M12	1.75	32 000	42 200	51400	59 000	74 200	80 100	88500	100 300
M14	2.0	43 700	57 500	70 200	80 500	101 200	109 300	120 800	136 900
M16	2.0	59 700	78500	95 800	109 900	138200	149 200	164 900	186 800
M18	2.5	73000	96 000	121 000	138200	176 600	176 600	203 500	230 400
M20	2.5	93 100	122 500	154 400	176 400	225 400	225400	259 700	294 000
M22	2.5	115 100	151 500	190 900	218200	278 800	278800	321 200	363 600
M24	3.0	134 100	176 500	222 400	254 200	324 800	324 800	374 200	423 600
M27	3.0	174 400	229 500	289 200	330 500	422 300	422 300	486 500	550 800
M30	3.5	213 200	280 500	353 400	403 900	516 100	516 100	594 700	673200
M33	3.5	263 700	347 000	437 200	499 700	638 500	638 500	735600	832 800
M36	4.0	310 500	408500	514700	588200	751600	751 600	866 000	980 400
M39	4.0	370 900	488 000	614 900	702 700	897 900	897 900	1035000	1 171 000

Note:

a. For the application of thin nuts, it should be considered that the stripping load is lower than the proof load of a nut with full loadability (see Annex A).

Proof load values for nuts with fine pitch thread

Thread D × P	Proof load a, N Property class
Thread D × P	04	05	5	6	8	10	12
M8X1.0	14 900	19 600	27 000	30 200	37 400	43100	47 000
M10X 1.25	23300	30 600	44 200	47 100	58400	67 300	73400
M10X1.0	24 500	32 200	44 500	49 700	61 600	71 000	77 400
M12X1.5	33500	44 000	60 800	68 700	84 100	97 800	105 700
M12X1.25	35 000	46 000	63 500	71 800	88 000	102 200	110 500
M14X1.5	47500	62 500	86 300	97 500	119 400	138 800	150 000
M16 X 1.5	63500	83 500	115 200	130 300	159 500	185 400	200 400
M18X2.0	77 500	102 000	146900	177 500	210 100	220 300	-
M18X1.5	81 700	107 500	154 800	187 000	221 500	232 200	-
M20X2.0	98 000	129 000	185 800	224 500	265 700	278 600	-
M20X1.5	103400	136 000	195 800	236 600	280 200	293 800	-
M22X2.0	120 800	159 000	229 000	276 700	327 500	343 400	-
M22X1.5	126 500	166 500	239800	289 700	343000	359 600	-
M24X2.0	145 900	192 000	276 500	334 100	395500	414700	-
M27X2.0	188500	248 000	351 100	431 500	510 900	535700	-
M30X2.0	236 000	310 500	447 100	540 300	639 600	670 700	-
M33X2.0	289 200	380 500	547 900	662 100	783800	821 900	-
M36X3.0	328 700	432 500	622 800	804 400	942 800	934 200	-
M39X3.0	391 400	515 000	741 600	957 900	1 123000	1 112 000	-

Note:

a. For the application of thin nuts, it should be considered that the stripping load is lower than the proof load of a nut with full loadability, see Annex A.

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