Standard lock washers (GOST 11872-80)

Thread diameter	d1	d2	d3	b	S	l	h
Not less	Not more
	20.5			4.8	1.0		3.5	6.0
	22.5
	24.5
	27.5				4.5	8.0
	30.5
	33.5			5.8	1.6
	36.5
	39.5
	42.5
	45.5
	48.5			7.8
	52.5				5.5	10.0
				9.5		6.5	13.0

Table 12.3

Dimensions of Slots Receiving Lock Washer Tabs, mm

Thread diameter d, mm	a 1	a 2 min	a 3 min	a 4 min	d 1 min
			3.5	1.0	16.5
			3.5	1.0	18.5
			4.0	1.5	23.5
			4.0	1.5	26.5
			4.0	1.5	29.5
			4.0	1.5	32.5
			4.0	1.5	35.5
			5.0	1.5	38.5

12.2. Determine dimensions of elements that are a part of the support assemblies.

12.2.1. Bearing caps.

Bearing caps may be made with screws or embedded in the casing. Construction of the screw cap and its dimensions are given in Fig. 12.5 a, where d_k is determined according to table 12.4. If bearings are held in place with nuts or spring washers, convex caps are used (Fig. 12.5, c).

If the length of the cap sleeve permits, a groove is made in the sleeve, in which a round-section packing ring of gasoline- or oil-resistant rubber is fitted (Fig. 12.5, b). The groove profile is shown in Fig. 12.5, b and the dimensions of its basic elements are taken as follows: b = 5.6 mm and d ₁ = D – 7.4 mm. The cross-section diameter is assumed as d = 4.6 mm.

Table 12.4