Thread Milling

THREADING | Solid Carbide and Indexable Thread Mills

Thread Mill Calculations and Recommended Passes

A

Thread Mill Drill Calculation Based on nominal tap drill diameter. Based on 0.003" or 0.075mm probable mean oversize.

DRILLING

Major Thread Diameter for # Drills Drill #

To calculate the percent of full thread for a given hole diameter:

Thread Diameter

# 2 # 3 # 4 # 5 # 6 # 8

0.086 0.099 0.112 0.125 0.132 0.164 0.190 0.216

% of thread = # of threads per inch • Basic major diameter of thread - Drill hole size 0.0130

IMPERIAL:

B

76.96 Pitch (mm)

% of thread =

• [ Basic major diameter of thread - Drill hole size ]

METRIC:

# 10 # 12

BORING

Recommended Passes

C

NPT / NPTF / BSPT / API

Recommen ISO ded Passes

UN / UNJ / BSPP / BSW / NPS / NPSF

Machinability

Machinability

Machinability

REAMING

Pitch Size

Pitch Size

Pitch Size 0.40 0.45 0.50 0.70 0.75 0.80 1.00 1.25 1.50 1.75 2.00 2.50 3.00 3.50 4.00 4.50 5.00 6.00

Easy

Average Difficult

Easy

Average Difficult

Easy

Average Difficult

64 56 48 44 40 36 32 28 24 20 19 18 16 14 13 12 11 10

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2

1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 3

2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 4 4 4 4 4 4

28 27 19 18 14

1 1 1 1 1 1 1 1 2

1 1 1 1 2 2 2 2 3

2 2 2 2 3 3 3 3 4

1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2

1 1 1 1 1 1 1 2 2 2 2 3 3 3 3 3 3 3

2 2 2 2 2 2 2 3 3 3 3 4 4 4 4 4 4 4

D

11.5

11 10

BURNISHING

8

1 Pass 2 Passes 3 Passes 4 Passes

E

THREADING

9 8 7 6

X

SPECIALS

www.alliedmachine.com | 1.330.343.4283

E: 51

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