Internal contact toothed chain

GB chain number	Pitch	Chain width	Bearing diameter	Pin shaft length	Distance between holes to teeth	Chain plate height	Oriented form	One piece	Ultimate tensile load	Weight per meter
	P	B min	d2 max	L max	h1	h2max		N	Q min	q
	mm	mm	mm	mm	mm	mm		N	kN/lbf	kg / m
C4-120		19.5		24.5			Inside	13	20.0	1.20
C4-123		22.5		27.5			Inside	15	23.0	1.37
C4-129		28.5		33.5			Inside	19	28.5	1.72
C4-132		31.5		36.5			Inside	21	31.5	1.89
C4-138		37.5		42.5			Inside	25	38.0	2.22
C4-150		49.5		54.5			Inside	33	50.0	2.90
C4-166		65.5		71.5			Inside	43	65.0	3.78
C4-169		68.5		74.5			Inside	45	74.0	3.93
C4-178		78.0		84.0			Inside	51	77.0	4.50
C4-181		81.0		87.0			Inside	53	80.0	4.70
C4-320		19.5		24.5			outer	13	20.0	1.21
C4-323		22.5		27.5			outer	15	23.0	1.38
C4-329	12.7	28.5	5.08	33.5	6.62	12.1	outer	19	28.5	1.73
C4-332		31.5		36.5			outer	21	31.5	1.90
C4-338		37.5		42.5			outer	25	29.0	2.23
C4-343		43.0		49.0			outer	28	42.5	2.51
C4-345		44.5		50.5			outer	29	44.0	2.58
C4-349		49.0		55.0			outer	32	48.5	2.84
C4-351		50.0		56.4			outer	33	50.0	2.94
C4-355		55.0		61.0			outer	26	54.5	3.17
C4-361		61.0		67.0			outer	40	60.5	3.53
C4-366		65.5		71.5			outer	43	65.0	3.78
C4-369		68.5		74.5			outer	45	68.0	3.93
C4-378		78.0		84.0			outer	51	77.0	4.50
C4-381		81.0		87.0			outer	53	80.0	4.70
C4-3104		103.5		109.5			outer	68	102.5	6.00