MS 51959 Machine Screws | McMaster-Carr

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	Specifications Met Specifications Met

Mil. Spec.

	System of Measurement System of Measurement

Inch

	Thread Size Thread Size

	Length Length

	Head Type Head Type

	Flat

	Material Material

Stainless Steel

	Finish Finish

Passivated

	Countersink Angle Countersink Angle

82°

	Drive Style Drive Style

	Phillips

	Head Diameter Head Diameter

	Flat Head Profile Flat Head Profile


Standard	Undercut

	Head Height Head Height

	Threading Threading

	Fully Threaded
	Partially Threaded

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
Compliant

	Thread Type Thread Type

UNC

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Hardness Hardness

Not Rated

	Thread Fit Thread Fit

Class 2A

	Tensile Strength Tensile Strength

60,000 to 99,999 psi

	Thread Direction Thread Direction

	Right Hand

	Size Size

	Thread Spacing Thread Spacing

Coarse

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72 Products

About Flat Head Screws

Passivated

Undercut Profile

Standard Profile

Choose these screws for their adherence to strict military standards for material and construction. They have good chemical resistance and may be mildly magnetic. Screws are angled under the head to sit flush within countersunk holes. Length is measured from the top of the head.

Screws with an undercut profile have a shallow head for use in thin materials. Passivated stainless steel screws protect against oxidation and corrosion.

For technical drawings and 3-D models, click on a part number.

Passivated 18-8 Stainless Steel—82° Countersink Angle
Lg.	Threading	Flat Head Profile	Head Dia.	Head Ht.	Drive Size	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
2-56
1/8"	Fully Threaded	Undercut	0.172"	0.036"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-1, SAE AMS2700	50	000000000	00000
3/16"	Fully Threaded	Standard	0.172"	0.051"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-2, SAE AMS2700	100	000000000	00000
1/4"	Fully Threaded	Standard	0.172"	0.051"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-3, SAE AMS2700	100	000000000	0000
5/16"	Fully Threaded	Standard	0.172"	0.051"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-4, SAE AMS2700	100	000000000	00000
3/8"	Fully Threaded	Standard	0.172"	0.051"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-5, SAE AMS2700	100	000000000	00000
7/16"	Fully Threaded	Standard	0.172"	0.051"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-6, SAE AMS2700	50	000000000	0000
1/2"	Fully Threaded	Standard	0.172"	0.051"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-7, SAE AMS2700	100	000000000	00000
5/8"	Fully Threaded	Standard	0.172"	0.051"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-8, SAE AMS2700	50	000000000	0000
3/4"	Fully Threaded	Standard	0.172"	0.051"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-9, SAE AMS2700	50	000000000	00000
7/8"	Fully Threaded	Standard	0.172"	0.051"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-10, SAE AMS2700	25	000000000	0000
4-40
3/16"	Fully Threaded	Undercut	0.225"	0.047"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-12, SAE AMS2700	50	000000000	0000
1/4"	Fully Threaded	Standard	0.225"	0.067"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-13, SAE AMS2700	100	000000000	00000
5/16"	Fully Threaded	Standard	0.225"	0.067"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-14, SAE AMS2700	100	000000000	00000
3/8"	Fully Threaded	Standard	0.225"	0.067"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-15, SAE AMS2700	100	000000000	00000
7/16"	Fully Threaded	Standard	0.225"	0.067"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-16, SAE AMS2700	50	000000000	0000
1/2"	Fully Threaded	Standard	0.225"	0.067"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-17, SAE AMS2700	50	000000000	0000
5/8"	Fully Threaded	Standard	0.225"	0.067"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-18, SAE AMS2700	50	000000000	0000
3/4"	Fully Threaded	Standard	0.225"	0.067"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-19, SAE AMS2700	50	000000000	00000
7/8"	Fully Threaded	Standard	0.225"	0.067"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-20, SAE AMS2700	50	000000000	00000
1"	Fully Threaded	Standard	0.225"	0.067"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-21, SAE AMS2700	50	000000000	00000
1 1/4"	Fully Threaded	Standard	0.225"	0.067"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-22, SAE AMS2700	50	000000000	00000
1 1/2"	Fully Threaded	Standard	0.225"	0.067"	No. 1	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-23, SAE AMS2700	25	000000000	0000
6-32
3/16"	Fully Threaded	Undercut	0.279"	0.059"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-25, SAE AMS2700	25	000000000	0000
1/4"	Fully Threaded	Standard	0.279"	0.083"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-26, SAE AMS2700	50	000000000	0000
5/16"	Fully Threaded	Standard	0.279"	0.083"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-27, SAE AMS2700	50	000000000	0000
3/8"	Fully Threaded	Standard	0.279"	0.083"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-28, SAE AMS2700	50	000000000	0000
7/16"	Fully Threaded	Standard	0.279"	0.083"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-29, SAE AMS2700	50	000000000	0000
1/2"	Fully Threaded	Standard	0.279"	0.083"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-30, SAE AMS2700	50	000000000	00000
5/8"	Fully Threaded	Standard	0.279"	0.083"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-31, SAE AMS2700	50	000000000	00000
3/4"	Fully Threaded	Standard	0.279"	0.083"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-32, SAE AMS2700	50	000000000	00000
7/8"	Fully Threaded	Standard	0.279"	0.081"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-33, SAE AMS2700	50	000000000	00000
1"	Fully Threaded	Standard	0.279"	0.083"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-34, SAE AMS2700	25	000000000	0000
1 1/4"	Fully Threaded	Standard	0.279"	0.081"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-35, SAE AMS2700	25	000000000	00000
1 1/2"	Fully Threaded	Standard	0.279"	0.081"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-36, SAE AMS2700	25	000000000	00000
1 3/4"	Fully Threaded	Standard	0.279"	0.081"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-37, SAE AMS2700	25	000000000	00000
8-32
1/4"	Fully Threaded	Undercut	0.332"	0.07"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-41, SAE AMS2700	50	000000000	00000
5/16"	Fully Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-42, SAE AMS2700	50	000000000	0000
3/8"	Fully Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-43, SAE AMS2700	50	000000000	00000
7/16"	Fully Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-44, SAE AMS2700	50	000000000	00000
1/2"	Fully Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-45, SAE AMS2700	50	000000000	00000
5/8"	Fully Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-46, SAE AMS2700	50	000000000	00000
3/4"	Fully Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-47, SAE AMS2700	25	000000000	0000
7/8"	Fully Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-48, SAE AMS2700	25	000000000	00000
1"	Fully Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-49, SAE AMS2700	25	000000000	0000
1 1/4"	Fully Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-50, SAE AMS2700	25	000000000	0000
1 1/2"	Fully Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-51, SAE AMS2700	25	000000000	00000
1 3/4"	Fully Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-52, SAE AMS2700	10	000000000	0000
2"	Fully Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-53, SAE AMS2700	10	000000000	0000
2 1/4"	Partially Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-54, SAE AMS2700	10	000000000	00000
2 1/2"	Partially Threaded	Standard	0.332"	0.1"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-55, SAE AMS2700	10	000000000	00000
10-24
3/8"	Fully Threaded	Standard	0.385"	0.116"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-61, SAE AMS2700	25	000000000	0000
7/16"	Fully Threaded	Standard	0.385"	0.116"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-62, SAE AMS2700	25	000000000	0000
1/2"	Fully Threaded	Standard	0.385"	0.116"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-63, SAE AMS2700	25	000000000	0000
5/8"	Fully Threaded	Standard	0.385"	0.116"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-64, SAE AMS2700	25	000000000	0000
3/4"	Fully Threaded	Standard	0.385"	0.116"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-65, SAE AMS2700	25	000000000	00000
7/8"	Fully Threaded	Standard	0.385"	0.116"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-66, SAE AMS2700	25	000000000	00000
1"	Fully Threaded	Standard	0.385"	0.116"	No. 2	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-67, SAE AMS2700	25	000000000	00000
1/4"-20
3/8"	Fully Threaded	Undercut	0.507"	0.107"	No. 3	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-77, SAE AMS2700	10	000000000	00000
7/16"	Fully Threaded	Undercut	0.507"	0.107"	No. 3	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-78, SAE AMS2700	10	000000000	00000
1/2"	Fully Threaded	Standard	0.507"	0.153"	No. 3	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-79, SAE AMS2700	10	000000000	0000
5/8"	Fully Threaded	Standard	0.507"	0.153"	No. 3	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-80, SAE AMS2700	10	000000000	00000
3/4"	Fully Threaded	Standard	0.507"	0.153"	No. 3	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-81, SAE AMS2700	10	000000000	00000
7/8"	Fully Threaded	Standard	0.507"	0.153"	No. 3	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-82, SAE AMS2700	10	000000000	00000
1"	Fully Threaded	Standard	0.507"	0.153"	No. 3	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-83, SAE AMS2700	10	000000000	00000
1 1/4"	Fully Threaded	Standard	0.507"	0.153"	No. 3	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-84, SAE AMS2700	10	000000000	0000
1 1/2"	Fully Threaded	Standard	0.507"	0.153"	No. 3	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-85, SAE AMS2700	10	000000000	0000
1 3/4"	Fully Threaded	Standard	0.507"	0.153"	No. 3	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-86, SAE AMS2700	5	000000000	0000
2"	Fully Threaded	Standard	0.507"	0.153"	No. 3	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-87, SAE AMS2700	5	000000000	00000
2 1/2"	Partially Threaded	Standard	0.507"	0.153"	No. 3	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-89, SAE AMS2700	5	000000000	00000
3/8"-16
1"	Fully Threaded	Standard	0.762"	0.23"	No. 4	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-111, SAE AMS2700	5	000000000	0000
1 1/4"	Fully Threaded	Standard	0.762"	0.23"	No. 4	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-112, SAE AMS2700	5	000000000	00000
1 1/2"	Fully Threaded	Standard	0.762"	0.23"	No. 4	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-113, SAE AMS2700	5	000000000	0000

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About Flat Head Screws

Mil. Spec. Stainless Steel Phillips Flat Head Screws