Restricted End-Quench Hardenability Bands — 15B21 RH to 4130 RH
Tabulations of Band Limits
“J” Distance Sixteenths of an Inch	GRADE
	15B21 RH		15B35 RH		3310 RH		4027 RH		4118 RH		4120 RH		4130 RH
	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min
1	47	42	57	52	42	37	51	46	47	42	47	42	55	50
2	46	41	55	51	42	37	48	42	44	38	45	39	54	48
3	44	39	54	50	42	37	43	34	38	30	41	35	52	44
4	42	33	53	49	41	36	37	28	33	25	38	30	49	40
5	37	24	50	41	41	36	32	24	29	22	34	26	46	36
6	30	20	46	33	41	35	28	22	27	20	31	24	44	34
7	24	—	42	28	40	33	26	20	25	—	29	22	41	32
8	22	—	36	24	40	33	24	—	24	—	28	21	39	30
9	20	—	32	23	39	32	23	—	23	—	26	20	37	28
10	—	—	28	21	39	32	22	—	22	—	25	—	35	27
11	—	—	—	—	39	31	22	—	21	—	24	—	33	26
12	—	—	25	—	39	31	21	—	20	—	23	—	32	26
13	—	—	—	—	38	30	21	—	—	—	23	—	32	26
14	—	—	24	—	38	30	20	—	—	—	22	—	31	25
15	—	—	—	—	37	29	—	—	—	—	22	—	31	25
16	—	—	23	—	37	29	—	—	—	—	21	—	31	25
18	—	—	—	—	36	28	—	—	—	—	20	—	30	24
20	—	—	22	—	36	28	—	—	—	—	—	—	30	23
22	—	—	—	—	35	27	—	—	—	—	—	—	30	23
24	—	—	20	—	35	27	—	—	—	—	—	—	29	22
26	—	—	—	—	35	27	—	—	—	—	—	—	29	22
28	—	—	—	—	34	26	—	—	—	—	—	—	28	21
30	—	—	—	—	34	26	—	—	—	—	—	—	28	21
32	—	—	—	—	34	26	—	—	—	—	—	—	27	20

NOTE:

These values were adjusted to the nearest Rockwell “C” point, and are used when points are selected and specified.

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