HSFG Washer

Description:

HSFG fasteners from ITA Fasteners are high strength fasteners which are used under externally threaded screws. They are used to indicate whether the required tension has been achieved in the support structure. They are also used under the head of externally threaded fasteners and high strength bolts. Depending on the application, you can choose from washers made out of medium carbon steel which is carburized for higher strength and consistent mechanical properties.

Like the other type of washers, the core functionality of the HSFG washer is to spread the load on thin support structures which are mostly sheet metal. These washers mostly find their application in the chemical, power plant and automobile industries. We take the quality of our products very seriously and ensure that all our fasteners are corrosion resistant, come with a friction grip and very high tensile strength for increased durability and comply with international standards for the same. Our HSFG washers are made with stainless steel, carbon steel, and alloy steel materials.

Dimensional Standards:

IS 6649- 1985 type A,B, AND C , BS 4395

Size range:

Metric: M5 to M12
Inches: As Per Requirement

HSFG Washer Dimensions

Table 1 Dimensions For Plain Hole Circular Washers (Type A)

(Clause 3)

All dimensions in mm

Nominal size (thread size d of associated bolt)		M16	M20	(M22)	M24	(M27)	M30	M36
d₁	Min	18	22	24	26	30	33	39
d₁	Max	18^.43	22^.52	24^.52	26^.52	30^.52	33^.62	39^.62
d2	Min	32^.4	40^.4	42^.4	48^.4	54^.1	58^.1	70^.1
d2	Max	34	42	44	50	56	60	72
s	Min	3^.1	3^.4	3^.4	3^.4	3^.4	3^.4	3^.4
s	Max	4^.6	4^.6	4^.6	4^.6	4^.6	4^.6	4^.6

Dimensions of IS 6649 - 1935 squre taper washer

Table 2 Dimensions For Square Taper Washers (Type A)

(Clause 3)

All dimensions in mm

Nominal size (thread size d of associated bolt)		M16	M20	(M22)	M24	(M27)	M30	M36
d^.	Min	18	22	24	28	30	33	39
d^.	Max	18^.43	22^.52	24^.52	26^.52	30^.52	33^.62	39^.62
a	Min	42	42	42	42	55	55	55
a	Max	45	45	45	45	58^.1	58	58
t	Min	7^.5	7^.5	7^.5	7^.5	7^.5	7^.5	7^.5
t	Max	8^.5	8^.5	8^.5	8^.5	8^.5	8^.5	8^.5
0	Type B	6	6	6	6	6	6	6
0	Type C	8	8	8	8	8	8	8

BS 4395-1 - 1969 High Strength Plain Washers

Screw Thread		(M12)	M16	M20	M22	M24	M27	M30	M36
d
d	max	13.8	17.8	21.5	23.4	26.4	29.4	32.8	38.8
d	min	13.4	17.4	21.1	23	26	29	32.4	38.4
d_c	max	30	37	44	50	56	60	66	85
d_c	min	29	36	43	48.5	54.5	58.5	64.5	83.5
h	max	2.8	3.4	3.7	4.2	4.2	4.2	4.2	4.6
h	min	2.4	3	3.3	3.8	3.8	3.8	3.8	4.2