Machine Screws

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Machine screws, may also be known as set screws. Both have machine threads, as opposed to self tapping or spring nut screw threads, so really the terms ‘machine screw’ and ‘set screw’ are interchangeable. What we define as machine screws have pan, countersunk or raised (i.e. oval) countersunk heads, while our set screws have hex heads. Machine, self tapping and spring nut screws often also have the word ‘recessed’ attached to the head description, often causing confusion. It simply means cross head screw drive; on very old recessed screws this means Phillips type screw drive, but for many decades now it has meant Pozidriv (or ‘PZ’), a stronger type of cross head screw drive that doesn’t ‘cam out’ or slip so easily when finally tightening the screw.

           
Slotted Countersunk Head BA Machine Screws
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Screwdriver Type
AJD2246C 0.1850" (2 BA) BA 3/4" Chrome Flat Blade
           
Recessed Countersunk Head UNC Machine Screws
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Screwdriver Type
CMZ204 0.138" (No 6) UNC 1/4" Zinc Pozidriv No 2
CMZ210 0.138" (No 6) UNC 5/8" Zinc Pozidriv No 2
CMZ212 0.138" (No 6) UNC 3/4" Zinc Pozidriv No 2
SF504041 1/4" UNC 1/2" Zinc Pozidriv No 3
           
Recessed Countersunk Head UNF Machine Screws
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Screwdriver Type
SF910161 0.190" (No 10) UNF 1/2" Zinc Pozidriv No 2
CMZ310 0.190" (No 10) UNF 5/8" Zinc Pozidriv No 2
CMZ312 0.190" (No 10) UNF 3/4" Zinc Pozidriv No 2
SF910960 0.190" (No 10) UNF 3" Zinc Pozidriv No 2
CMZ407 1/4" UNF 7/16" Zinc Pozidriv No 3
CMZ408 1/4" UNF 1/2" Zinc Pozidriv No 3
CMZ410 1/4" UNF 5/8" Zinc Pozidriv No 3
CMZ412 1/4" UNF 3/4" Zinc Pozidriv No 3
SF604121 1/4" UNF 1 1/4" Zinc Pozidriv No 3
CMZ422 1/4" UNF 1/3/8" Zinc Pozidriv No 3
CMP422 1/4" UNF 1 3/8" Chrome Pozidriv No 3
CMZ428 1/4" UNF 1 3/4" Zinc Pozidriv No 3
           
Slotted Pan Head BA Machine Screws
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Screwdriver Type
AJD1742Z 0.1102" (6 BA) BA 1/4" Zinc Flat Blade
           
Recessed Pan Head UNC Machine Screws
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Screwdriver Type
SE806121 0.138" (No 6) UNC 3/8" Zinc Pozidriv No 2
SE806201 0.138" (No 6) UNC 5/8" Zinc Pozidriv No 2
27H8811 0.138" (No 6) UNC 7/8" Chrome Pozidriv No 2
PMZ216 0.138" (No 6) UNC 1" Zinc Pozidriv No 2
           
Recessed Pan Head UNF Machine Screws
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Screwdriver Type
PMZ305 0.190" (No 10) UNF 5/16" Zinc Pozidriv No 2
PMZ306 0.190" (No 10) UNF 3/8" Zinc Pozidriv No 2
PMP306 0.190" (No 10) UNF 3/8" Chrome Pozidriv No 2
PMZ307 0.190" (No 10) UNF 7/16" Zinc Pozidriv No 2
SE910144 0.190" (No 10) UNF 7/16" Black Pozidriv No 2
PMZ308 0.190" (No 10) UNF 1/2" Zinc Pozidriv No 2
PMZ310 0.190" (No 10) UNF 5/8" Zinc Pozidriv No 2
PMZ312 0.190" (No 10) UNF 3/4" Zinc Pozidriv No 2
PMP312 0.190" (No 10) UNF 3/4" Chrome Pozidriv No 2
PMZ314 0.190" (No 10) UNF 7/8" Zinc Pozidriv No 2
PMZ316 0.190" (No 10) UNF 1" Zinc Pozidriv No 2
PMZ320 0.190" (No 10) UNF 1 1/4" Zinc Pozidriv No 2
SE604031 1/4" UNF 3/8" Zinc Pozidriv No 3
PMZ408 1/4" UNF 1/2" Zinc Pozidriv No 3
PMZ410 1/4" UNF 5/8" Zinc Pozidriv No 3
PMZ412 1/4" UNF 3/4" Zinc Pozidriv No 3
SE604061 1/4" UNF 3/4" Zinc Pozidriv No 3
SE605041 5/16" UNF 1/2" Zinc Pozidriv No 4
SE605091 5/16" UNF 1 1/8" Zinc Pozidriv No 4
           
Recessed Pan Head Metric Fine Machine Screws
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Screwdriver Type
SE104161 4mm (M4) Metric Fine 16mm Zinc Pozidriv No 2
SE104165 4mm (M4) Metric Fine 16mm Black Pozidriv No 2
SE105081 5mm (M5) Metric Fine 8mm Zinc Pozidriv No 2
SE105101 5mm (M5) Metric Fine 10mm Zinc Pozidriv No 2
SE106161 6mm (M6) Metric Fine 16mm Zinc Pozidriv No 3
SE106201 6mm (M6) Metric Fine 20mm Zinc Pozidriv No 3
           
Recessed Raised Countersunk Head UNF Machine Screws
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Screwdriver Type
RMP306 0.190" (No 10) UNF 3/8" Chrome Pozidriv No 2
RMP307 0.190" (No 10) UNF 7/16" Chrome Pozidriv No 2
RMZ308 0.190" (No 10) UNF 1/2" Zinc Pozidriv No 2
RMP308 0.190" (No 10) UNF 1/2" Chrome Pozidriv No 2
RMZ310 0.190" (No 10) UNF 5/8" Zinc Pozidriv No 2
RMP310 0.190" (No 10) UNF 5/8" Chrome Pozidriv No 2
RMZ312 0.190" (No 10) UNF 3/4" Zinc Pozidriv No 2
RMP312 0.190" (No 10) UNF 3/4" Chrome Pozidriv No 2
RMZ316 0.190" (No 10) UNF 1" Zinc Pozidriv No 2
RMP316 0.190" (No 10) UNF 1" Chrome Pozidriv No 2
SG604041 1/4" UNF 1/2" Zinc Pozidriv No 3
SG604051 1/4" UNF 5/8" Zinc Pozidriv No 3
RMP414 1/4" UNF 7/8" Chrome Pozidriv No 3
RMZ510 5/16" UNF 5/8" Zinc Pozidriv No 4

 

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