Tabel standar Ukuran mata bor untuk Roll Tap (Forming)

Apa yang dimaksud Roll Tap atau Forming Tap ?

Roll tap adalah proses pembentukan ulir dengan metode Cold Forming, Mendorong dan menekan benda kerja sampai terbentuk ulir tanpa terjadinya proses pengikisan pada benda kerja, jadi berbeda dengan Cutting Tap.

Bagaimana Cara menghitung ukuran mata bor untuk Roll tap ?

menghitung ukuran lubang Roll tap Berbeda cara penghitungan dengan Cutting Tap, yaitu :

Diameter Ulir – (1//2 x Pitch)

misal ukuran Tap M6 x 1 cara menghitungnya yaitu

6 mm – (1/2 x 1) = 6 mm – 0.5 = 5.50 mm, ukuran lubang inipun disesuaikan dengan toleransi limit Tap tersebut seperti GH4, GH5, GH6, GH7, GH8, GH9, GH10.

Berikut ini adalah Tabel standar ukuran Mata bor untuk Roll tap

dari M2, M2.2, M2.5, M3, M4, M5, M6, M7, M8, M10, M12, M14, M16, M18 dan m20 lengkap beserta Limit Toleransinya,

Thread Size	Drill Size (mm)
	Tap Limits
	GH4	GH5	GH6	GH7	GH8	GH9	GH10	GH11
M2 x 0.4	1.83	1.84	– – –	– – –	– – –	– – –	– – –	– – –
M2.2 x 0.45	2.00	2.01	– – –	– – –	– – –	– – –	– – –	– – –
M2.3 x 0.4	2.13	2.14	– – –	– – –		– – –	– – –	– – –
M2.5 x 0.45	2.30	2.31	– – –	– – –	– – –	– – –	– – –	– – –
M2.6 x 0.45	2.40	2.41	– – –	– – –	– – –	– – –	– – –	– – –
M3 x 0.5	2.77	2.78	2.79	2.81	– – –	– – –	– – –	– – –
M3 x 0.35	2.85	2.87	2.88	2.89	– – –	– – –	– – –	– – –
M3.5 x 0.6	– – –	3.23	3.24	3.25	– – –	– – –	– – –	– – –
M4 x 0.7	– – –	3.67	3.68	3.70	– – –	– – –	– – –	– – –
M4 x 0.5	– – –	3.78	3.79	3.81	– – –	– – –	– – –	– – –
M5 x 0.8	– – –	4.61	4.63	4.64	– – –	– – –	– – –	– – –
M5 x 0.5	– – –	4.78	4.79	4.81	– – –	– – –	– – –	– – –
M6 x 1	– – –	5.50	5.51	5.53	– – –	– – –	– – –	– – –
M6 x 0.75	– – –	5.64	5.65	5.67	– – –	– – –	– – –	– – –
M6 x 0.5	– – –	5.78	5.79	5.81	– – –	– – –	– – –	– – –
M7 x 1	– – –	6.50	6.51	6.53	– – –	– – –	– – –	– – –
M8 x 1.25	– – –	– – –	7.37	7.39	7.40	– – –	– – –	– – –
M8 x 1	– – –	– – –	7.51	7.53	7.54	– – –	– – –	– – –
M10 x 1.5	– – –	– – –	9.23	9.24	9.26	9.27	– – –	– – –
M10 x 1.25	– – –	– – –	9.37	9.39	9.40	9.41	– – –	– – –
M10 x 1	– – –	– – –	9.51	9.53	9.54	9.55	– – –	– – –
M12 x 1.75	– – –	– – –	– – –	11.10	11.12	11.13	11.14	– – –
M12 x 1.5	– – –	– – –	– – –	11.24	11.26	11.27	11.28	– – –
M12 x 1.25	– – –	– – –	– – –	11.39	11.40	11.41	11.42	– – –
M12 x 1	– – –	– – –	– – –	11.53	11.54	11.55	11.56	– – –
M14 x 2	– – –	– – –	– – –	– – –	12.98	12.99	13.00	13.01
M14 x 1.5	– – –	– – –	– – –	– – –	13.26	13.27	13.28	13.30
M14 x 1	– – –	– – –	– – –	– – –	13.54	13.55	13.56	13.58
M16 x 2	– – –	– – –	– – –	– – –	14.98	14.99	15.00	15.01
M16 x 1.5	– – –	– – –	– – –	– – –	14.26	15.27	15.28	15.30
M16 x 1	– – –	– – –	– – –	– – –	15.54	15.55	15.56	15.58
M18 x 2.5	– – –	– – –	– – –	– – –	– – –	16.71	16.72	16.73
M18 x 1.5	– – –	– – –	– – –	– – –	– – –	17.27	17.28	17.30
M20 x 2.5	– – –	– – –	– – –	– – –	– – –	– – –	18.72	18.73
M20 x 1.5	– – –	– – –	– – –	– – –	– – –	– – –	19.28	19.30