Screw Material Guidelines Table

BASE SCREW MATERIALS

ACCEPTABILITY FOR RESIN WEAR CONDITIONS

MATERIAL DESIGNATION

TREATMENT (1)

Rc

(2)

FH

(3)

ABRASIVE

CORROSIVE (7)

NORMAL (4)

AVERAGE (5)

SEVERE (6)

MODERATE

SEVERE

ALLOY STEELS:

   4140

 

Flame -hardened

 

48-55

 

no

 

Acceptable

 

Poor

 

Unacceptable

 

Unacceptable

 

Unacceptable

   4140 Chrome-plated

60-65

yes

Good Acceptable Unacceptable Good Unacceptable
   Nitralloy 135-M Nitrided

63-70

yes

Good Acceptable Unacceptable Poor Unacceptable
TOOL STEELS:

   PM 9V

 

Heat-treated

 

54-56

 

no

 

Excellent

 

Excellent

 

Good

 

Acceptable

 

Unacceptable

   PMM4 Heat-treated

62-64

no

Excellent Good Acceptable Poor Unacceptable
   PM 420 Heat-treated

54-56

no

Acceptable Poor Unacceptable Good Poor
SPECIAL ALLOYS:

   Monel K-500

 

Age hardened

 

37-39

 

opt’l

 

Acceptable

 

Unacceptable

 

Unacceptable

 

Excellent

 

Good

   Nickel 718 Age hardened

43-45

opt’l

Acceptable Unacceptable Unacceptable Excellent Good
   Encapsulations Carbide coatings

70+

no

Excellent Excellent Good Good Poor

PM = Particle Metallurgy Process
(1) Includes chrome-plating to .003"-.005" and gas or ion nitriding for 24+ hour cycle.
(2) Rockwell C hardness.
(3) Flight hardsurfacing required.
(4) Thermoplastics with no reinforcements.
(5) Thermoplastics with up to 30% reinforcement.
(6) Thermoplastics with more than 30% reinforcement.
(7) Moderate includes cellulosics, acetals and others containing corrosive additives.

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