Refined High-Strength Spring Pad

Short Description:

Usage of spring washer
1. For general bolt connections, flat washers should be placed under the bolt head and nut to increase the pressure-bearing area.
2. For bolts and anchor bolts designed with anti-loosening requirements, the nut or spring washer of the anti-loosening device should be used, and the spring washer must be set on the side of the nut.
3. For bolt connections bearing dynamic loads or important parts, spring washers should be placed according to the design requirements, and spring washers must be set on the side of the nut.
4. For I-beams and channel steels, inclined washers should be used when using inclined plane connections to make the bearing surface of the nut and bolt head perpendicular to the screw.

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Surface treatment process

1. Blackening (blue) The fasteners to be blackened are placed in the solution tank (145±5 °C) of sodium hydroxide (NaOH) and sodium nitrite (NaNO2) oxidant to heat and oxidize, so that the surface of the metal fastener generates a magnetic ferric tetroxide (Fe3O4) film, the thickness is generally 0.6-0.8μm, black or blue-black. The HG/20613-2009 and HG/T20634-2009 standards for fasteners for pressure vessels require bluing treatment.

2. Phosphating phosphating is a process of chemical and electrochemical reaction to form a phosphate chemical conversion film, and the phosphate conversion film formed is called a phosphate conversion film. The main purpose of phosphating is to provide protection for the base metal and prevent the metal from being corroded to a certain extent, to improve the adhesion and anti-corrosion ability of the paint film layer before painting, and to reduce friction and lubrication in the metal cold working process. Large-diameter double-ended studs for pressure vessels are required to be phosphated.

3. Hot-dip galvanizing hot-dip galvanizing is to immerse the derusted steel components into the molten zinc melted at a high temperature of about 600 °C, so that the surface of the steel components is attached to the zinc layer, and the thickness of the zinc layer shall not be less than 65μm for thin plates below 5mm, and not less than 86μm for thick plates of 5mm and above. So as to play the purpose of anti-corrosion.

4. DacrometDacromet is the transliteration and abbreviation of DACROMET, referred to as Dacromet, Dacromet, Dicron. Named zinc-chromium coating in China, it is a new type of anticorrosive coating with zinc powder, aluminum powder, chromic acid and deionized water as the main components. There is no hydrogen embrittlement problem and the torque-preload consistency is good. Regardless of the environmental concerns of hexavalent chromium, it is actually the most suitable for high-strength fasteners with high corrosion protection requirements.

Size

Parameters

Nominal Diameter		Φ2	Φ2.2	Φ2.5	Φ3	Φ3.5	Φ4	Φ5	Φ6	Φ7	Φ8	Φ10	Φ12
d	min	2.1	2.3	2.6	3.1	3.6	4.1	5.1	6.1	7.1	8.1	10.2	12.2
d	max	2.4	2.6	2.9	3.4	3.9	4.4	5.4	6.5	7.5	8.5	10.7	12.7
n	Nominal Size	0.9	1	1	1.3	1.3	1.5	1.8	2.5	2.5	3	3.5	4
	max	1	1.1	1.1	1.4	1.4	1.6	1.9	2.65	2.65	3.15	3.7	4.2
	min	0.8	0.9	0.9	1.2	1.2	1.4	1.7	2.35	2.35	2.85	3.3	3.8
h	Nominal Size	0.5	0.6	0.6	0.8	0.8	0.9	1.2	1.6	1.6	2	2.2	2.5
	max	0.6	0.7	0.7	0.9	0.9	1	1.3	1.7	1.7	2.1	2.35	2.65
	min	0.4	0.5	0.5	0.7	0.7	0.8	1.1	1.5	1.5	1.9	2.05	2.35
H	min	1	1.2	1.2	1.6	1.6	1.8	2.4	3.2	3.2	4	4.4	5
H	max	1.2	1.4	1.4	1.9	1.9	2.1	2.8	3.8	3.8	4.7	5.2	5.9
per 1000 units = kg		0.033	0.050	0.053	0.11	0.12	0.18	0.36	0.83	0.93	1.6	2.53	3.82

Nominal Diameter		Φ14	Φ16	Φ18	Φ20	Φ22	Φ24	Φ27	Φ30	Φ36	Φ39	Φ42	Φ45
d	min	14.2	16.2	18.2	20.2	22.5	24.5	27.5	30.5	36.5	39.5	42.5	45.5
d	max	14.7	17	19	21.2	23.5	25.5	28.5	31.7	37.7	40.7	43.7	46.7
n	Nominal Size	4.5	5	5	6	6	7	7	8	10	10	12	12
	max	4.7	5.2	5.2	6.2	6.2	7.25	7.25	8.25	10.25	10.25	12.25	12.25
	min	4.3	4.8	4.8	5.8	5.8	6.75	6.75	7.75	9.75	9.75	11.75	11.75
h	Nominal Size	3	3.5	3.5	4	4	5	5	6	6	6	7	7
	max	3.15	3.7	3.7	4.2	4.2	5.2	5.2	6.2	6.2	6.2	7.25	7.25
	min	2.85	3.3	3.3	3.8	3.8	4.8	4.8	5.8	5.8	5.8	6.75	6.75
H	min	6	7	7	8	8	10	10	12	12	12	14	14
H	max	7.1	8.3	8.3	9.4	9.4	11.8	11.8	14.2	14.2	14.2	16.5	16.5
per 1000 units = kg		6.01	8.91	9.73	15.2	16.5	26.2	28.7	44.3	67.3	71.7	111	117

Nominal Diameter		Φ48	Φ52	Φ56	Φ60	Φ64	Φ68	Φ72	Φ80	Φ90	Φ100
d	min	49	53	57	61	65	69	73	81	91	101
d	max	50.5	54.5	58.5	62.5	66.5	70.5	74.5	82.5	92.5	102.5
n	Nominal Size	12	14	14	14	14	14	14	14	14	14
	max	12.25	14.25	14.25	14.25	14.25	14.25	14.25	14.25	14.25	14.25
	min	11.75	13.75	13.75	13.75	13.75	13.75	13.75	13.75	13.75	13.75
h	Nominal Size	7	8	8	8	8	8	8	8	8	8
	max	7.25	8.25	8.25	8.25	8.25	8.25	8.25	8.25	8.25	8.25
	min	6.75	7.75	7.75	7.75	7.75	7.75	7.75	7.75	7.75	7.75
H	min	14	16	16	16	16	16	16	16	16	16
H	max	16.5	18.9	18.9	18.9	18.9	18.9	18.9	18.9	18.9	18.9
per 1000 units = kg		123	182	193	203	218	228	240	262	290	318