Optimas Parts Imperial Blog Series: Technical Insight Into Phillips Machine Screws

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Optimas designed the Parts Imperial Blog Series to provide detailed information about the fasteners you use and the ones you may need. Curated to help you find the right parts, these technical releases supply information on components’ specifications, applications and standards. In this blog, we will focus on Phillips machine screws.

Phillips Machine Screws

Phillips machine screws are designed to hold metal components together and have a specified minimum tensile strength of 60,000 psi. They are designed to be used with a mating machine screw nut, a standard hex nut of Grade 2 or higher strength, or a mating tapped thread. The threads are Class 2A thread fit and thread length is 1” minimum for diameters up to #5 included and 1-1/2” minimum for all sizes #6 and larger.

The Phillips drive allows installation and removal with a mating Phillips driver bit. This recess is prone to the driver bit slipping out of the recess by design to help prevent over-torqueing of the fastener. The Phillips drive provides serviceability with common tools. The small head diameter allows this screw to fit into tight spaces.

Specification Resources

Dimensional and material requirements are controlled by ASME B18.6.3. This type of fastener is generally available in sizes #4 through 1/2” diameter and length as shown in the table below. Other lengths are possible.

Phillips Fillister Head Machine Screw

Phillips fillister head machine screw parts diagram
Phillips Fillister Head Machine Screws Spec Chart2
Phillips fillister head machine screws

⇐ Click to enlarge Phillips Fillister Head Machine Screw Specs Chart. Dimensions are given in inches.

TABLE 1

Phillips Fillister Head Machine Screws

THREAD SIZE #4 #5 #6 #8 #10 1/4" 5/16" 3/8" 7/16" 1/2"
THREAD PITCH 40 UNC 48 UNF 40 UNC 44 UNF 32 UNC 40 UNF 32 UNC 36 UNF 24 UNC 32 UNF 20 UNC 28 UNF 18 UNC 24 UNF 16 UNC 24 UNF 14 UNC 20 UNF 13 UNC 20 UNF
A HEAD DIAMETER .166/.183 .187/.205 .208/.226 .250/.270 .292/.313 .389/.414 .490/.518 .590/.622 .589/.625 .710/.750
B HEAD HEIGHT .088/.107 .100/.120 .111/.132 .133/.56 .156/.180 .207/.237 .262/.295 .315/.355 .321/.368 .362/.412
C HEAD SIDE HEIGHT .069/.079 .078/.088 .086/.096 .102/.113 .118/.130 .155/.170 .194/.211 .233/.253 .242/.265 .273/.297
LT THREAD LENGTH Fully threaded up to 1-1/8” included. Longer lengths are 1” min. thread length. Fully threaded up to 2” included. Longer lengths are 1-1/2” min. thread length.
DRIVER SIZE 1 2 3 4
L LENGTH LENGTH TOLERANCE
1/8 –.02 –.03
1/4
5/16
3/8
1/2
5/8 –.03
3/4
7/8
1
1-1/8 –.03
1-1/4
1-3/8
1-1/2
1-5/8
1-3/4
1-7/8
2
2-1/4 –.03
2-3/4
3
3-1/4
3-1/2
3-3/4
4
4-1/4
4-1/2
4-3/4
5
5-1/2
6
Over 6

Phillips Oval Head Machine Screw

Phillips Oval Head Machine Screws Spec Chart
Phillips Oval Head Machine Screw

⇐ CLICK TO ENLARGE PHILLIPS OVAL HEAD MACHINE SCREW SPECS CHART. DIMENSIONS ARE GIVEN IN INCHES.

TABLE 1

Phillips Oval Head Machine Screws

THREAD SIZE #4 #5 #6 #8 #10 1/4" 5/16" 3/8" 7/16" 1/2"
THREAD PITCH 40 UNC 48 UNF 40 UNC 44 UNF 32 UNC 40 UNF 32 UNC 36 UNF 24 UNC 32 UNF 20 UNC 28 UNF 18 UNC 24 UNF 16 UNC 24 UNF 14 UNC 20 UNF 13 UNC 20 UNF
A HEAD DIAMETER .191/.212 .215/.237 .238/.262 .285/.312 .333/.362 .442/.477 .556/.597 .670/.717 .715/.760 .765/.813
B HEAD HEIGHT .067 ref .075 ref .083 ref .100 ref .116 ref .153 ref .191 ref .230 ref .223 ref .223 ref
C ANGLE 80°/82°
D HEAD HEIGHT .037 ref .041 ref .045 ref .052 ref .060 ref .079 ref .099 ref .117 ref .122 ref .131 ref
LT THREAD LENGTH Fully threaded up to 1-1/8” included. Longer lengths are 1” min. thread length. Fully threaded up to 1-1/8” included. Longer lengths are 1” min. thread length.
DRIVER SIZE 1 2 3 4
L LENGTH LENGTH TOLERANCE
1/8 –.02 –.03
1/4
5/16
3/8
1/2
5/8 –.03
3/4
7/8
1
1-1/8 –.03
1-1/4
1-3/8
1-1/2
1-5/8
1-3/4
1-7/8
2
2-1/4 –.03
2-3/4
3
3-1/4
3-1/2
3-3/4
4
4-1/4
4-1/2
4-3/4
5
5-1/2
6
Over 6

 Phillips Pan Head Machine Screw

Phillips Pan Head Machine Screws Spec Chart
Phillips Pan Head Screw

⇐ CLICK TO ENLARGE PHILLIPS pan HEAD MACHINE SCREW SPECS CHART. DIMENSIONS ARE GIVEN IN INCHES.

TABLE 1

Phillips Pan Head Machine Screws

THREAD SIZE #4 #5 #6 #8 #10 1/4" 5/16" 3/8" 7/16" 1/2"
THREAD PITCH 40 UNC 48 UNF 40 UNC 44 UNF 32 UNC 40 UNF 32 UNC 36 UNF 24 UNC 32 UNF 20 UNC 28 UNF 18 UNC 24 UNF 16 UNC 24 UNF 14 UNC 20 UNF 13 UNC 20 UNF
A HEAD DIAMETER .205/.219 .205/.219 .205/.219 .205/.219 .205/.219 .205/.219 .205/.219 .205/.219 .205/.219 .205/.219
B HEAD HEIGHT .205/.219 .205/.219 .205/.219 .205/.219 .205/.219 .205/.219 .205/.219 .205/.219 .205/.219 .205/.219
LT THREAD LENGTH Fully threaded up to 1-1/8” included. Longer lengths are 1” min. thread length. Fully threaded up to 1-1/8” included. Longer lengths are 1” min. thread length.
DRIVER SIZE 1 2 3 4
L LENGTH LENGTH TOLERANCE
1/8 –.02 –.03
1/4
5/16
3/8
1/2
5/8 –.03
3/4
7/8
1
1-1/8 –.03
1-1/4
1-3/8
1-1/2
1-5/8
1-3/4
1-7/8
2
2-1/4 –.03
2-3/4
3
3-1/4
3-1/2
3-3/4
4
4-1/4
4-1/2
4-3/4
5
5-1/2
6
Over 6

Phillips Truss Head Machine Screw

Phillips Truss Head Machine Screws Spec Chart
Phillips Truss Head_wf shadow

⇐ CLICK TO ENLARGE PHILLIPS truss HEAD MACHINE SCREW SPECS CHART. DIMENSIONS ARE GIVEN IN INCHES.

TABLE 1

Phillips Truss Head Machine Screws

THREAD SIZE #4 #5 #6 #8 #10 1/4" 5/16" 3/8" 7/16" 1/2"
THREAD PITCH 40 UNC 48 UNF 40 UNC 44 UNF 32 UNC 40 UNF 32 UNC 36 UNF 24 UNC 32 UNF 20 UNC 28 UNF 18 UNC 24 UNF 16 UNC 24 UNF 14 UNC 20 UNF 13 UNC 20 UNF
A HEAD DIAMETER .241/.257 .272/.289 .303/.321 .364/.384 .425/.448 .546/.573 .666/.698 .787/.823 .907/.948 1.028/1.07
B HEAD HEIGHT .059/.069 .066/.078 .074/.086 .088/.102 .103/.118 .133/.150 .162/.183 .191/.215 .221/.248 .250/.280
LT THREAD LENGTH Fully threaded up to 1-1/8” included. Longer lengths are 1” min. thread length. Fully threaded up to 2” included. Longer lengths are 1-1/2” min. thread length.
DRIVER SIZE 1 2 3 4
L LENGTH LENGTH TOLERANCE
1/8 –.02 –.03
1/4
5/16
3/8
1/2
5/8 –.03
3/4
7/8
1
1-1/8 –.03
1-1/4
1-3/8
1-1/2
1-5/8
1-3/4
1-7/8
2
2-1/4 –.03
2-3/4
3
3-1/4
3-1/2
3-3/4
4
4-1/4
4-1/2
4-3/4
5
5-1/2
6
Over 6

Get a Technical Consult

For more information on Phillips machine screws or any type of fastener, contact our experts at optimas.com/contact.

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