What is the difference between machine screws and bolts?

Machine screws have a slotted head, whereas bolts have a hex head.To install a machine screw, place a flat-heat or Philips head screwdriver into the slotted head and turn it. The screw can be removed by turning the screwdriver in the opposite direction (anti-clockwise).Bolts feature a hex head instead of a slotted head. For installing a bolt, place a hex socket over the head and turn it.Machine screws are generally smaller than bolts. Machine screws are less than 1 inch long, whereas bolts come in a variety of sizes, with some of them being over 2 inches long.

What standards do these machine screws comply with?

These machine screws adhere to AN, ASME, ASTM, CSA, DIN, EHEDG, FDA, Federal Specifications, IFI, ISO, JIS, Military Specifications, MS90728-10, NAS, SAE and UL standards.

Machine Screws

APPROVED VENDOR -

18-8 Stainless Steel Machine Screw, Phillips, Flat Head

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Style	Model	Driver Size	Head Angle	Head Dia.	Head Height	Length	Thread Size	Price (ex. VAT)
A	2AA24	#0	82°	0.137"	0.043"	3/8"	1-72	€18.10
B	1ZY99	#0	82°	0.112"	0.035"	3/8"	0-80	€16.24
C	1ZY95	#0	82°	0.112"	0.035"	3/16"	0-80	€11.34
D	1ZY93	#0	82°	0.112"	0.035"	1/8"	0-80	€1.32
E	1ZY97	#0	82°	0.112"	0.035"	1/4"	0-80	€14.68
F	U51300.008.0050	#1	82°	0.162"	0.051"	1/2"	2-56	€3.73
G	U51300.011.0018	#1	82°	0.212"	0.067"	3/16"	4-40	€3.43
H	U51300.008.0043	#1	82°	0.162"	0.051"	7/16"	2-56	€3.67
I	U51300.008.0031	#1	82°	0.162"	0.051"	5/16"	2-56	€6.21
J	U51300.008.0062	#1	82°	0.162"	0.051"	5/8"	2-56	€2.93
K	U51300.008.0075	#1	82°	0.162"	0.051"	3/4"	2-56	€3.11
L	U51300.008.0087	#1	82°	0.162"	0.051"	7/8"	2-56	€7.73
M	U51300.011.0125	#1	82°	0.212"	0.067"	1.25"	4-40	€5.11
N	U51300.011.0031	#1	82-80°	0.212-0.191"	0.067" (Ref)	5/16"	4-40	€5.06
O	U51300.008.0037	#1	82°	0.162"	0.051"	3/8"	2-56	€3.39
P	U51300.011.0087	#1	82°	0.212"	0.067"	7/8"	4-40	€5.73
Q	U51300.008.0100	#1	82°	0.162"	0.051"	1"	2-56	€4.55
R	U51300.011.0043	#1	82°	0.212"	0.067"	7/16"	4-40	€4.90
S	U51300.011.0062	#1	82-80°	0.212-0.191"	0.067" (Ref)	5/8"	4-40	€6.03
T	U51300.011.0150	#1	82°	0.212"	0.067"	1.5"	4-40	€6.09
U	U51300.011.0012	#1	82°	0.212"	0.067"	1/8"	4-40	€14.98
V	U51300.008.0056	#1	82°	0.162"	0.051"	9/16"	2-56	€4.73
W	U51300.008.0025	#1	82°	0.162"	0.051"	1/4"	2-56	€3.87
X	U51300.011.0025	#1	82-80°	0.212-0.191"	0.067" (Ref)	1/4"	4-40	€3.91
Y	U51300.011.0075	#1	82°	0.212"	0.067"	3/4"	4-40	€5.52

GRAINGER -

Carbon Steel Machine Screw, Phillips, Pan Head

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Style	Model	Head Dia.	Head Height	Length	Thread Size	Price (ex. VAT)
A	U24522.008.0037	0.155"	0.053"	3/8"	2-56	€7.51
B	U24522.011.0018	0.205"	0.07"	3/16"	4-40	€4.24

APPROVED VENDOR -

Brass Machine Screw, Slotted, Flat Head

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Style	Model	Head Dia.	Head Height	Length	Thread Size	Price (ex. VAT)
A	U48170.011.0050	0.212"	0.067"	1/2"	4-40	€7.50
A	U48170.011.0150	0.212"	0.067"	1.5"	4-40	€50.89
A	U48170.011.0075	0.212"	0.067"	3/4"	4-40	€10.58
B	U48170.011.0037	0.212"	0.067"	3/8"	4-40	€6.71
C	U48170.011.0025	0.212"	0.067"	1/4"	4-40	€6.56
D	U48170.011.0100	0.212"	0.067"	1"	4-40	€11.10
E	U48170.013.0150	0.262"	0.083"	1.5"	6-32	€49.64
F	U48170.013.0200	0.262"	0.083"	2"	6-32	€32.33
G	U48170.013.0037	0.262"	0.083"	3/8"	6-32	€20.51
H	U48170.013.0125	0.262"	0.083"	1.25"	6-32	€44.30
I	U48170.013.0100	0.262"	0.083"	1"	6-32	€17.87
J	U48170.013.0075	0.262"	0.083"	3/4"	6-32	€14.84
K	U48170.013.0062	0.262"	0.083"	5/8"	6-32	€11.52
L	U48170.013.0025	0.262"	0.083"	1/4"	6-32	€7.24
M	U48170.013.0050	0.262"	0.083"	1/2"	6-32	€12.74
N	116042-PG	0.362"	0.116"	3/8"	10-32	€44.54
O	116044-PG	0.362"	0.116"	5/8"	10-32	€66.47
O	116043-PG	0.362"	0.116"	1/2"	10-32	€56.68
O	116047-PG	0.362"	0.116"	1.25"	10-32	€146.32
O	116045-PG	0.362"	0.116"	3/4"	10-32	€75.47

KANEBRIDGE -

Steel Machine Screw, Phillips, Pan Head

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Style	Model	Length	Thread Length	Price (ex. VAT)
A	0806MPPB	3/8"	3/8"	€7.30
B	0810MPPB	5/8"	5/8"	€6.52

GRAINGER -

Brass Machine Screw, Slotted, Pan Head

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Style	Model	Dia./Thread Size	Driver Size	Head Dia.	Head Height	Length	Price (ex. VAT)
A	M48040.030.0006	M3 x 0.5	0.8mm	6mm	1.8mm	6"	€14.23
B	M48040.040.0025	M4 x 0.7	1mm	8mm	2.4mm	25ft.	€18.72
C	M48040.050.0008	M5 x 0.8	1.2mm	1mm	3mm	8"	€14.95
D	M48040.050.0016	M5 x 0.8	1.2mm	1mm	3mm	16	€25.28
E	M48040.050.0012	M5 x 0.8	1.2mm	1mm	3mm	12"	€20.59
F	M48040.050.0020	M5 x 0.8	1.2mm	1mm	3mm	20ft.	€21.52

GRAINGER -

A2 Stainless Steel (Comparable to 18-8 Stainless Steel) Machine Screw, Slotted, Flat Head

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Style	Model	Dia./Thread Size	Driver Size	Head Dia.	Length	Price (ex. VAT)
A	M51110.016.0004	M1.6-0.35	0.40mm	3mm	4"	€5.89
B	M51110.050.0025	M5 x 0.8	1.20mm	9.2mm	25ft.	€31.96
C	M51110.060.0025	M6 x 1	1.60mm	11mm	25ft.	€14.31
C	M51110.080.0040	M8 x 1.25	2mm	14.5mm	40mm	€20.39
D	M51110.080.0020	M8 x 1.25	2mm	14.5mm	20ft.	€15.76

GRAINGER -

18-8 Stainless Steel Machine Screw, Slotted, Round Head

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Style	Model	Dia./Thread Size	Driver Size	Head Dia.	Head Height	Length	Price (ex. VAT)
A	U51213.013.0300	#6-32	0.039 to 0.048"	0.240 to 0.260"	0.091" to 0.103	3"	€10.61
B	U51213.016.0400	#8-32	0.045 to 0.054"	0.287 to 0.309"	0.107 to 0.12"	4"	€21.78
C	U51213.019.0400	#10-24	0.056 to 0.067"	0.334 to 0.359"	0.123 to 0.137"	4"	€12.46
D	U51213.021.0150	#12-24	0.056 to 0.067"	0.382 to 0.408"	0.139" to 0.153	1.5"	€20.24
E	U51213.025.0050	1/4"-20	0.064" to 0.075"	0.443 to 0.472"	0.16 to 0.175"	1/2"	€9.24
F	U51213.025.0087	1/4"-20	0.064 to 0.075"	0.443 to 0.472"	0.16 to 0.175"	7/8"	€12.17
D	U51213.025.0275	1/4"-20	0.064 to 0.075"	0.443 to 0.472"	0.16 to 0.175"	2.75"	€25.78
G	U51213.025.0037	1/4"-20	0.064 to 0.075"	0.443 to 0.472"	0.16 to 0.175"	3/8"	€8.52
H	U51213.025.0075	1/4"-20	0.064 to 0.075"	0.443 to 0.472"	0.16 to 0.175"	3/4"	€13.73
I	U51213.025.0125	1/4"-20	0.064 to 0.075"	0.443 to 0.472"	0.16 to 0.175"	1.25"	€15.09
J	U51213.037.0175	3/8"-16	0.081 to 0.094"	0.670 to 0.708"	0.237 to 0.256"	1.75"	€22.10

GRAINGER -

18-8 Stainless Steel Machine Screw, Slotted, Truss Head

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Style	Model	Dia./Thread Size	Driver Size	Head Dia.	Head Height	Length	Price (ex. VAT)
A	U51215.019.0200	#10-24	0.056 to 0.067"	0.425 to 0.448"	0.103 to 0.118"	2"	€13.49
B	U51215.025.0050	1/4"-20	0.064 to 0.075"	0.546 to 0.573"	0.133 to 0.15"	1/2"	€7.26
C	U51215.025.0062	1/4"-20	0.064 to 0.075"	0.546 to 0.573"	0.133 to 0.15"	5/8"	€11.90
D	U51215.025.0075	1/4"-20	0.064 to 0.075"	0.546 to 0.573"	0.133 to 0.15"	3/4"	€8.98
E	U51215.025.0037	1/4"-20	0.064 to 0.075"	0.546 to 0.573"	0.133 to 0.15"	3/8"	€6.85

GRAINGER -

18-8 Stainless Steel Machine Screw, Phillips, Flat Head

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Style	Model	Dia./Thread Size	Head Dia.	Length	Price (ex. VAT)
A	U51300.013.0300	#6-32	0.238 to 0.262"	3"	€11.13
B	U51300.016.0275	#8-32	0.285 to 0.312"	2.75"	€21.51
C	U51300.019.0200	#10-24	0.333 to 0.362"	2"	€13.61

GRAINGER -

A2 Stainless Steel (Comparable to 18-8 Stainless Steel) Machine Screw, Phillips, Flat Head

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Style	Model	Dia./Thread Size	Driver Size	Head Dia.	Length	Price (ex. VAT)
A	M51300.030.0035	M3 x 0.5	#1	5.6mm	35mm	€9.11
B	M51300.040.0045	M4 x 0.7	#2	7.5mm	45mm	€11.77
C	M51300.050.0025	M5 x 0.8	#2	9.2mm	25ft.	€12.15
D	M51300.060.0030	M6 x 1	#3	11mm	30"	€34.39
E	M51300.060.0035	M6 x 1	#3	11mm	35mm	€22.62
F	M51300.060.0045	M6 x 1	#3	11mm	45mm	€14.28
G	M51300.080.0030	M8 x 1.25	#4	14.5mm	30"	€29.06
H	M51300.080.0025	M8 x 1.25	#4	14.5mm	25ft.	€28.26
I	M51300.080.0050	M8 x 1.25	#4	14.5mm	50ft.	€25.11

GRAINGER -

Machine Screw M5

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Style	Model	Drive Type	Driver Size	Head Dia.	Head Height	Head Type	Length	Material	Tensile Strength	Price (ex. VAT)
A	M51320.050.0040	Phillips	#2	9.20mm	1.25mm	Oval	40mm	A2 Stainless Steel	72518 psi	€26.11
B	M51120.050.0100	Slotted	1.20mm	8.50mm	3.3mm	Cheese	100ft.	A2 Stainless Steel	72518 psi	€7.56
C	M51110.050.0040	Slotted	1.20mm	9.2mm	-	Flat	40mm	A2 Stainless Steel	72518 psi	€14.01
D	M51110.050.0045	Slotted	1.20mm	9.2mm	-	Flat	45mm	A2 Stainless Steel	72518 psi	€17.29
D	M51110.050.0060	Slotted	1.20mm	9.2mm	-	Flat	60	A2 Stainless Steel	72518 psi	€11.18
E	M51120.050.0090	Slotted	1.20mm	8.50mm	3.3mm	Cheese	90mm	A2 Stainless Steel	72518 psi	€6.38
D	M48170.050.0030	Slotted	1.20mm	9.2mm	-	Flat	30"	Brass	53663 psi	€28.14
D	M51110.050.0030	Slotted	1.20mm	9.2mm	-	Flat	30"	A2 Stainless Steel	72518 psi	€22.63
D	M51110.050.0035	Slotted	1.20mm	9.2mm	-	Flat	35mm	A2 Stainless Steel	72518 psi	€55.76

COOPER B-LINE -

Flat Head Hex Head Machine Screws

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Style	Model
A	1/2X21/2SFHMSZN	RFQ
A	1/4X3/4SFHMSZN	RFQ
A	1/2X1SFHMSZN	RFQ

COOPER B-LINE -

Hex Head Machine Screws

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Style	Model
A	1/4X11/2SHHMSZN	RFQ
A	1/4X11/4SHHMSZN	RFQ

COOPER B-LINE -

Flat Head Concrete Screws

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Style	Model
A	ACS-25-225F	RFQ
A	ACS-25-275F	RFQ
A	ACS-18-125F	RFQ
A	ACS-18-175F	RFQ
A	ACS-18-275F	RFQ
A	ACS-25-125F	RFQ
A	ACS-18-225F	RFQ
A	ACS-25-175F	RFQ

COOPER B-LINE -

Stainless Steel Screws

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Style	Model
A	SS4PK	RFQ
B	SS2PK	RFQ

COOPER B-LINE -

Self Drilling Sheet Mounting Screws

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B

Style	Model
A	BWHS-9	RFQ
B	BWHS-9D	RFQ

COOPER B-LINE -

SRHMS Slotted Round Head Machine Screws

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Style	Model
A	SRHM1/4X1/2ZN	RFQ
A	SRHM1/4X1ZN	RFQ
A	SRHM1/4X3/4ZN	RFQ
A	SRHM3/8X11/2ZN	RFQ
A	SRHM3/8X1SS4	RFQ
A	SRHM3/8X1SS6	RFQ
A	SRHM3/8X2ZN	RFQ
A	SRHM5/16X11/4ZN	RFQ
A	SRHM3/8X1 1/4ZN	RFQ
A	SRHM3/8X1ZN	RFQ
A	SRHM5/16X1ZN	RFQ
A	SRHM1/4X11/2ZN	RFQ

COOPER B-LINE -

CNPSS Series Square Head Cone Point Set Screws

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Style	Model
A	1/2X11/2CNPSSZN	RFQ
A	1/2X2CNPSSZN	RFQ
A	3/8X2CNPSSZN	RFQ
A	1/2X21/2CNPSSZN	RFQ
A	5/8X21/2CNPSSZN	RFQ

COOPER B-LINE -

Wall Screws

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Style	Model
A	AWS-CH	RFQ
B	AWS-OH	RFQ
C	AWS-PH	RFQ

APPROVED VENDOR -

Machine Screw Round

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Style	Model	Drive Type	Driver Size	Finish	Head Dia.	Head Height	Length	Material	Tensile Strength	Price (ex. VAT)
A	U24211.016.0100	Phillips	#2	Zinc-Plated	0.309-0.287"	0.12 to 0.107"	1"	Carbon Steel	60,000 PSI	€4.28
B	U24211.016.0075	Phillips	#2	Zinc-Plated	0.309-0.287"	0.12 to 0.107"	3/4"	Carbon Steel	60,000 PSI	€4.21
C	U24211.013.0150	Phillips	#2	Zinc-Plated	0.260"	0.103"	1.5"	Carbon Steel	60,000 PSI	€2.17
D	U24211.016.0025	Phillips	#2	Zinc-Plated	0.309-0.287"	0.12 to 0.107"	1/4"	Carbon Steel	60,000 PSI	€6.10
E	U24211.016.0125	Phillips	#2	Zinc-Plated	0.309"	0.12"	1.25"	Carbon Steel	60,000 PSI	€5.89
F	U24211.013.0050	Phillips	#2	Zinc-Plated	0.260-0.240"	0.103 to 0.091"	1/2"	Carbon Steel	60,000 PSI	€1.57
G	U24211.016.0031	Phillips	#2	Zinc-Plated	0.309"	0.12"	5/16"	Carbon Steel	60,000 PSI	€5.30
H	U24211.016.0037	Phillips	#2	Zinc-Plated	0.309-0.287"	0.12 to 0.107"	3/8"	Carbon Steel	60,000 PSI	€3.67
I	U24211.016.0150	Phillips	#2	Zinc-Plated	0.309"	0.12"	1.5"	Carbon Steel	60,000 PSI	€6.28
J	U24211.016.0200	Phillips	#2	Zinc-Plated	0.309"	0.12"	2"	Carbon Steel	60,000 PSI	€5.32
K	U24211.016.0087	Phillips	#2	Zinc-Plated	0.309"	0.12"	7/8"	Carbon Steel	60,000 PSI	€6.70
L	U24211.013.0125	Phillips	#2	Zinc-Plated	0.260"	0.103"	1.25"	Carbon Steel	60,000 PSI	€7.33
M	U24211.016.0050	Phillips	#2	Zinc-Plated	0.309-0.287"	0.12 to 0.107"	1/2"	Carbon Steel	60,000 PSI	€3.91
N	U24211.016.0062	Phillips	#2	Zinc-Plated	0.309"	0.12"	5/8"	Carbon Steel	60,000 PSI	€4.29
O	U24211.013.0075	Phillips	#2	Zinc-Plated	0.260-0.240"	0.103 to 0.091"	3/4"	Carbon Steel	60,000 PSI	€3.87
P	U24211.013.0100	Phillips	#2	Zinc-Plated	0.260-0.240"	0.103 to 0.091"	1"	Carbon Steel	60,000 PSI	€2.66
Q	U51213.016.0200	Slotted	-	Plain	0.309"	0.12"	2"	18-8 Stainless Steel	-	€26.90
R	U51213.016.0150	Slotted	-	Plain	0.309-0.287"	0.12 to 0.107"	1.5"	18-8 Stainless Steel	-	€20.99
S	U51213.016.0125	Slotted	-	Plain	0.309"	0.12"	1.25"	18-8 Stainless Steel	-	€18.32
T	U51213.016.0087	Slotted	-	Plain	0.309"	0.12"	7/8"	18-8 Stainless Steel	-	€24.74
U	U51213.016.0175	Slotted	-	Plain	0.309"	0.12"	1.75"	18-8 Stainless Steel	-	€15.57
V	U51213.016.0043	Slotted	-	Plain	0.309"	0.12"	7/16"	18-8 Stainless Steel	-	€7.47
W	U51213.016.0037	Slotted	-	Plain	0.309-0.287"	0.12 to 0.107"	3/8"	18-8 Stainless Steel	-	€6.74
X	U51213.016.0300	Slotted	-	Plain	0.309"	0.12"	3"	18-8 Stainless Steel	-	€9.29
Y	U51213.016.0250	Slotted	-	Plain	0.309"	0.12"	2.5"	18-8 Stainless Steel	-	€18.64

GRAINGER -

Machine Screw, #5, Steel

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Style	Model	Finish	Head Dia.	Head Type	Length	Material	Price (ex. VAT)
A	U51213.012.0100	Plain	0.217 to 0.236"	Round	1"	304 Stainless Steel	€4.77
A	U51213.012.0200	Plain	0.217 to 0.236"	Round	2"	304 Stainless Steel	€12.38
B	U51110.012.0050	Plain	0.215 to 0.237"	Flat	1/2"	304 Stainless Steel	€57.18
A	U51213.012.0050	Plain	0.217 to 0.236"	Round	1/2"	304 Stainless Steel	€3.09
B	U51110.012.0075	Plain	0.215 to 0.237"	Flat	3/4"	304 Stainless Steel	€7.61
B	U51110.012.0100	Plain	0.215 to 0.237"	Flat	1"	304 Stainless Steel	€8.07
C	U51213.012.0075	Plain	0.217 to 0.236"	Round	3/4"	304 Stainless Steel	€4.06
A	U51213.012.0150	Plain	0.217 to 0.236"	Round	1.5"	304 Stainless Steel	€6.27
D	U51213.012.0037	Plain	0.217 to 0.236"	Round	3/8"	304 Stainless Steel	€4.71
B	U51110.012.0150	Plain	0.215 to 0.237"	Flat	1.5"	304 Stainless Steel	€10.77
E	U24210.012.0018	Zinc-Plated	0.217 to 0.236"	Oval	3/16"	Low Carbon Steel	€7.27
E	U24210.012.0050	Zinc-Plated	0.217 to 0.236"	Round	1/2"	Low Carbon Steel	€8.28
E	U24210.012.0075	Zinc-Plated	0.217 to 0.236"	Round	3/4"	Low Carbon Steel	€8.38
E	U24210.012.0125	Zinc-Plated	0.217 to 0.236"	Round	1.25"	Low Carbon Steel	€8.11
E	U24210.012.0200	Zinc-Plated	0.217 to 0.236"	Round	2"	Low Carbon Steel	€20.11
E	U24210.012.0025	Zinc-Plated	0.217 to 0.236"	Round	1/4"	Low Carbon Steel	€8.68
E	U24210.012.0037	Zinc-Plated	0.217 to 0.236"	Round	3/8"	Low Carbon Steel	€6.58
E	U24210.012.0062	Zinc-Plated	0.217 to 0.236"	Round	5/8"	Low Carbon Steel	€7.03
E	U24210.012.0100	Zinc-Plated	0.217 to 0.236"	Round	1"	Low Carbon Steel	€9.69
F	U24210.012.0150	Zinc-Plated	0.217 to 0.236"	Round	1.5"	Low Carbon Steel	€12.71
E	U24210.012.0250	Zinc-Plated	0.217 to 0.236"	Round	2.5"	Low Carbon Steel	€95.27
E	U24210.012.0300	Zinc-Plated	0.217 to 0.236"	Round	3"	Low Carbon Steel	€105.54

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