Engine spec (reference only)

chart tap & drill

Metric tap & drill chart

American Wire Gauge (AWG) to Decimal Inches

AWG	Inches	AWG	Inches
4/0	0.46000	20	0.03200
3/0	0.40960	21	0.02850
2/0	0.36480	22	0.02530
1/0	0.32490	23	0.02260
1	0.28930	24	0.02010
2	0.25760	25	0.01790
3	0.22940	26	0.01590
4	0.20430	27	0.01420
5	0.18190	28	0.01260
6	0.16200	29	0.01130
7	0.14430	30	0.01000
8	0.12850	31	0.00893
9	0.11440	32	0.00795
10	0.10190	33	0.00708
11	0.09070	34	0.00631
12	0.08080	35	0.00562
13	0.07200	36	0.00500
14	0.06410	37	0.00445
15	0.05710	38	0.00397
16	0.05080	39	0.00353
17	0.04530	40	0.00315
18	0.04030	50	0.00099
19	0.03590


Hose ID (Dash Size) to Fractional Inches/Millimeters

Dash No.	Hose ID Except SAE 100R5		SAE Dash Size* (SAE 100R5)

	Inches	Millimeters	Inches	Millimeters

-2	1/8	3.2
-3	3/16	4.8
-4	1/4	6.4	3/16	4.8
-5	5/16	7.9	1/4	6.4
-6	3/8	9.5	5/16	7.9
-8	1/2	12.7	13/32	10.3
-10	5/8	15.9	1/2	12.7
-12	3/4	19.0	5/8	15.9
-14	7/8	22.2
-16	1	25.4	7/8	22.2
-20	1 1/4	31.8	1 1/8	28.6
-24	1 1/2	38.1	1 1/8	28.6
-32	2	50.8	1 13/16	46.0
-36	2 1/4	57.6
-40	2 1/2	63.5	2 3/8	60.3
-48	3	76.2
-56	3 1/2	88.9
-64	4	101.6
-72	4 1/2	115.2

* SAE Dash Size equals OD of the tubing, which has approximately the same ID as the hose, expressed in 1/16"

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