Fig. 30 Par. 1.14

HOLD SIZES, SPOT FACES, WRENCHES, MINIMUM
CENTERS FOR HEX BOLTS

HOLE SIZES-SPOT FACES-WRENCHES-MINIMUM CENTERS FOR HEX. BOLTS

Minimum thread length is measured from the extreme end of

the bolt to the last complete thread.

The length of the bolt is measured from the under surface of the

head to the end of the bolt.

Bolts too short for minimum thread lengths are threaded to
"diameter; "for" to 1" diameter;
" for 24" to 3" diameter.

within 4" of head on sizes to
2" for 1" to 2" diameter; and

THREAD LENGTH: Machine screws are threaded as close to head as possible for lengths up to 14. Lengths over 14 have 14 minimum thread.

28

7

5

32

ᄒ

3

16

9

7

32

은 13/2

16

32

16

9

5

8

64

ᄒ

16

13/2

7

16

THREAD LENGTH: Cap screws are threaded 2D plus. Lengths shorter than 20
plus are threaded as close to the head as practicable.

FINISH: Cap screw heads are machined on all surfaces.

F. Length:

NOTES

Std. lengths are in: "increments to "; " increments 1" to 4"
and "increments 4" to 6"

G. Length of full depth thread:

I. N.C.- 2 Dia. +2" where thread length would be greater than
of the screw length.

length where thread length would be greater than
"2 Dia. + 1⁄2 "

"

2. N.F.12 Dia. +" where thread length would be greater than
of the screw length.

length where thread length would be greater than

11⁄2 Dia. + ".

3. Screws too short for above rules are threaded as close to
to the head as practicable.

H. Nominal Chamfer

35° extending to root of thread.

FORMERLY X-D-3108

106-D-225