Smith Brothers guide to determining custom pushrod part numbers

PREFIX

SUFFIX PICK 2 (always put rocker end as first letter)

UP TO 400 LBS OPEN SPRING PRESSURE

5/16 TUBE ENDS

W/OIL

NO OIL

3/8 TUBE ENDS

W/OIL

NO OIL

NR54A**

5/16 X .049 4130 CHROMOLY NON-HEAT TREAT

A

1/8 R* BALL

X

X

A

1/8 R* BALL

X

NR54B**

B

5/32 R BALL

X

X

B

5/32 R BALL

X

X

NR34A

3/8 X .049 4130 CHROMOLY NON-HEAT TREAT

C

5/32 R CUP

X

X

C

5/32 R CUP

X

X

NR34B

D

3/16 R MW BALL

X

X

D

3/16 R MW BALL

X

X

UP TO 500 LBS OPEN SPRING PRESSURE

E

3/16 R CUP

X

E

3/16 R CUP

X

X

NH54A

5/16 X .049 4130 CHROMOLY HEAT TREATED

F

5/32 R BALL

0.040

F

5/32 R BALL

0.040

NH54B

G

5/32 R BALL

0.030

G

5/32 R BALL

0.030

NH34A

3/8 X .049 4130 CHROMOLY HEAT TREATED

H

5/32 R BALL

0.020

H

5/32 R BALL

0.020

NH34B

I

3/16 R MW BALL

0.040

I

3/16 R  BALL

X

X

UP TO 700 LBS OPEN SPRING PRESSURE

J

11/64 R BALL

X

X

J

11/64 R BALL

X

NH58A

5/16 X .083 4130 CHROMOLY HEAT TREATED

K

1/4 R BALL

X

X

K

1/4 R BALL

X

NH58B

L

5/16 R BALL

X

L

5/16 R BALL

X

X

*CN5C2

5/16 X .083 4130 CHROMOLY 2-PC

M

1/2 R BALL

X

M

1/2 R BALL

X

NH36A

3/8 X .065 4130 CHROMOLY HEAT TREATED

N

15/64 R BALL

X

N

15/64 R BALL

X

NH36B

O

9/64 R CUP

X

O

9/64 R CUP

X

NH76A

7/16 X .065 4130 CHROMOLY HEAT TREATED

P

7/32 R BALL

X

X

P

7/32 R BALL

X

X

NH76B

Q

11/64 R CUP

X

Q

11/64 R CUP

X

OVER 700 LBS OPEN SPRING PRESSURE

R

11/64 R CUP**

X

R

11/64 R CUP*

X

*short cup for Volvo

NH5116A

5/16 X .116 4130 CHROMOLY HEAT TREATED

S

1/8 R CUP

X

S

5/32 R CUP

0.040

NH5116B

T

13/64 R CUP

X

T

3/16 R CUP

0.040

*CN5116C2

5/16 X .116 4130 CHROMOLY 2 PC

U

7/64 R BALL

X

U

1/4 R CUP

X

NH38A

3/8 X .083 4130 CHROMOLY HEAT TREATED

V

1/8 R CAD BALL

X

V

15/64 R CUP

X

X

NH38B

W

9/64 R BALL

X

X

W

5/16 R CUP

X

*CN38C2

3/8 X .083 4130 CHROMOLY 2-PC

X

13/64 R BALL

X

X

15/64 R PH BALL**

X

**Harley Pan Head

NH312A

3/8 X .120 4130 CHROMOLY HEAT TREATED

Y

9/32 R BALL

X

Y

11/64 R MW BALL

X

NH312B

Z

5/32 R CORVAIR

X

Z

1/2 R MM BALL***

X

***Minneapolis Moline

*CN312C2

3/8 X .120 4130 CHROMOLY 2 PC

1

11/128 R BALL

X

1

9/32 R CUP

X

NH314A

3/8 X .145 4130 CHROMOLY HEAT TREATED

2

FLAT

X

NH314B

*R=radius

For adjustable rods,  change the prefix to AR or AH.

*CN314C2

3/8 X .145 4130 CHROMOLY 2 PC

**short cup for Volvo

ADJUSTABLE ENDS

NH79A

7/16 X .095 4130 CHROMOLY HEAT TREATED

A

1/8 R SCREW

X

X

NH79B

7/16 & 1/2 TUBE ENDS

B

5/32 R SCREW

X

X

*CN79C2

7/16 X .095 4130 CHROMOLY 2-PC

A

1/8 R BALL

X

C

11/64 R SCREW

X

NH712A

7/16 X .120 4130 CHROMOLY HEAT TREATED

B

5/32 R BALL

X

X

D

3/16 R SCREW

X

X

*early Olds

NH712B

C

5/32 R CUP

X

E

5/32 R SCREW*

X

**5/16 hex

NH716A

7/16 X .165 4130 CHROMOLY HEAT TREATED

D

3/16 R MW BALL

X

X

F

5/32 R SCREW**

X

X

NH716B

E

3/16 R CUP

X

X

G

5/32 R CUP SCREW

X

NH212A

1/2 X .120 4130 CHROMOLY HEAT TREATED

F

5/32 R BALL

0.040

H

FLAT SCREW

X

***5/16 thread

NH212B

G

5/32 R TF CUP*

X

I

1/8 R SCREW***

X

NH215A

1/2 X .156 4130 CHROMOLY HEAT TREATED

H

3/16 R TF CUP*

X

X

NH215B

I

3/16 R BALL

X

X

EXAMPLE

NH218A

1/2 X .188 4130 CHROMOLY HEAT TREATED

J

5/32 R TF BALL*

X

X

NH38A-CB----3/8 .083 HEAT TREATED

NH218B

K

3/16 R TF BALL*

X

5/32 R CUP & 5/32 R BALL NO/OIL

*FOR USE WITH GUIDE PLATES

L

5/32 R OSL BALL**

X

**A=NO/OIL   B=W/OIL

M

9/64 R CUP

X

EXAMPLE

N

7/32 R BALL

X

AR54B-AA---5/16 X .049 NON-HEAT TREAT ADJUSTABLE 1/8 R SCREW & 1/8 R BALL W/OIL

O

7/32 R BALL

X

Recommended max open spring

*Top Fuel Ends

Lengths are to be specified and are not part number specific. On cup & ball style rods, let us know if the length is to the top of the cup (OA)= Overall or to the inside of the cup (EL)= Effective.

pressures are based on 9" length

**OFF-SET Lifter End

& naturally aspirated engines