LOCK NUTS (STATE STANDARD 8961-75 )


 

Figure 4.27 – Conventional drawings of lock nut

 

Table 4.13

Nominal bore, Dy, mm Thread G, inch External diameter, mm Internal diameter, mm H, mm D, mm S, mm Chamfer с, mm
3/8 16.663 14.951 31,2
1/2 20.956 18.532 36,9 1,5
3/4 26.442 24.119 41,6 1,5
33.25 30.292 53,1
41.912 38.954 63,5
47.805 44.847 69,3
59.616 56.659 86,5

The example of the conventional denotation of a lock-nut with the nominal bore 20 mm: Lock-nut 20 State Standard 8961-75.

 

PIPE COUPLINGS (STATE STANDARD 8955-75)

Figure 4.28 – Conventional drawings of pipe coupling

Table 4.14

Nominal bore, Dy, mm Thread G, inch L, mm l , mm D1, mm D2, mm B, mm b1, mm b2, mm h, mm Number of ribs   Chamfer с, mm
3/8 3.5
1/2 1,5
3/4 10.5 32.5 2.5 2.5 1,5
39.5 2.5 2.5 4.5 2.5
2.5
68.5 3.5 3.5

Note. Sizes of external and internal diameters are resulted in table 4.12.

The example of the conventional denotation of a pipe coupling with the nominal bore 20 mm: Pipe Coupling 20 State Standard 8955-75.

REDUCERS OR REDUCING COUPLINGS (STATE STANDARD 8957-75)

Figure 4.29 – Conventional drawings of reducing coupling

 

Table 4.15

Nominal bore, Dy, mm Threads G1хG2, inch L, mm l , mm l1, mm   l2, mm   D1, mm D2, mm D3, mm D4, mm b, mm b1, mm b2, mm h, mm Number of ribs  
20х10 3/4 х3/8 3.5
20х15 3/4х1/2 3.5
25х15 1 х 1/2
32х15 1 х1/2 48.5 2.5 2.5
32х20 1 х3/4 48.5 32.5 2.5 2.5
32х25 1 х 1 48.5 39.5 2.5 2.5
40х20 1 х3/4 55.5 32.5 2.5 2.5 4.5 2.5
40х25 1 х 1 55.5 39.5 2.5 2.5 4.5 2.5
50х25 2х1 2.5

 

The example of the conventional denotation of a reducing coupling with the nominal bore 20 mm: Reducing Coupling 20 State Standard 8957-75.


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