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ねじ下穴径表：ユニファイねじ用

※D1：JIS 2Bねめじ内径を表します。
※UNEF、UN,UNSの2Bめねじ内径D1はASMEB1.1によります。

呼び	D1(内径)		ドリル径 (参考)
単位(mm)
呼び	Max.	Min.	ドリル径 (参考)
No. 0 – 80UNF	1.305	1.182	1.25
No. 1 – 64UNC	1.582	1.425	1.55
No. 1 – 72UNF	1.612	1.474	1.55
No. 2 – 56UNC	1.871	1.695	1.80
No. 2 – 64UNF	1.912	1.756	1.85
No. 3 – 48UNC	2.146	1.941	2.1
No. 3 – 56UNF	2.197	2.025	2.1
No. 4 – 40UNC	2.385	2.157	2.3
No. 4 – 48UNF	2.458	2.271	2.4
No. 5 – 40UNC	2.697	2.487	2.6
No. 5 – 44UNF	2.740	2.551	2.7
No. 6 – 32UNC	2.895	2.642	2.8
No. 6 – 40UNF	3.022	2.820	2.9
No. 8 – 32UNC	3.530	3.302	3.4
No. 8 – 36UNF	3.606	3.404	3.5
No.10 – 24UNC	3.962	3.683	3.9
No.10 – 32UNF	4.165	3.963	4.1
No.12 – 24UNC	4.597	4.344	4.5
No.12 – 28UNF	4.724	4.496	4.6
No.12 – 32UNEF	4.826	4.623	4.7
1/4 – 20UNC	5.257	4.979	5.1
1/4 – 28UNF	5.588	5.360	5.5
1/4 – 32UNEF	5.689	5.487	5.6
5/16 – 18UNC	6.731	6.401	6.6
5/16 – 24UNF	7.035	6.782	6.9
5/16 – 32UNEF	7.264	7.087	7.1
3/8 – 16UNC	8.153	7.798	8.0
3/8 – 24UNF	8.636	8.382	8.5
3/8 – 32UNEF	8.864	8.662	8.7
7/16 – 14UNC	9.550	9.144	9.4
7/16 – 20UNF	10.033	9.729	9.9
7/16 – 28UNEF	10.337	10.135	10.2
1/2 – 13UNC	11.023	10.592	10.9
1/2 – 20UNF	11.607	11.329	11.5
1/2 – 28UNEF	11.938	11.710	11.8
9/16 – 12UNC	12.446	11.989	12.2
9/16 – 18UNF	13.081	12.751	12.9
9/16 – 24UNEF	13.385	13.132	13.2
5/8 – 11UNC	13.868	13.386	13.6
5/8 – 18UNF	14.681	14.351	14.5
5/8 – 24UNEF	14.986	14.732	14.8
3/4 – 10UNC	16.840	16.307	16.6
3/4 – 16UNF	17.678	17.323	17.5
3/4 – 20UNEF	17.957	17.679	17.8
7/8 – 9UNC	19.761	19.177	19.6
7/8 – 14UNF	20.675	20.270	20.5
7/8 – 20UNEF	21.132	20.854	21.0
1 – 8UNC	22.606	21.971	22.3
1 – 12UNF	23.571	23.114	23.3
1 – 14UNS	23.825	23.445	23.6
1 – 20UNEF	24.307	24.029	24.1
1 1/8 – 7UNC	25.349	24.638	25.0
1 1/8 – 12UNF	26.746	26.289	26.5
1 1/8 – 18UNEF	27.381	27.051	27.2
1 1/8 – 8UN	25.781	25.146	25.5
1 1/4 – 7UNC	28.524	27.813	28.2
1 1/4 – 12UNF	29.921	29.464	29.6
1 1/4 – 18UNEF	30.556	30.226	30.3
1 1/4 – 8UN	28.956	28.321	28.5
1 3/8 – 6UNC	31.115	30.353	30.8
1 3/8 – 12UNF	33.096	32.639	32.8
1 3/8 – 18UNEF	33.731	33.401	33.5
1 3/8 – 8UN	32.131	31.496	31.8
1 1/2 – 6UNC	34.290	33.528	34.0
1 1/2 – 12UNF	36.271	35.814	36.0
1 1/2 – 18UNEF	36.906	36.576	36.7
1 1/2 – 8UN	35.306	34.671	35.0
1 5/8 – 18UNEF	40.081	39.751	39.8
1 5/8 – 8UN	38.481	37.846	38.1
1 5/8 – 12UN	39.446	38.989	39.1
1 3/4 – 5UNC	39.827	38.964	39.5
1 3/4 – 8UN	41.656	41.021	41.3
1 3/4 – 12UN	42.621	42.164	42.3
2 – 4 1/2UNC	45.593	44.679	45.2
2 – 8UN	48.006	47.371	47.8
2 – 12UN	48.971	48.514	48.6

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ねじ下穴径表：ユニファイねじ用

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