MS 51959 Machine Screws | McMaster-Carr

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60,000 psi to 99,999 psi

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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	00000
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	00000
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	00000
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	00000
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	00000
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	00000
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	00000
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	00000
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	00000
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	00000
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	00000
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	00000
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	00000
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	00000
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	00000
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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Mil. Spec. Stainless Steel Phillips Flat Head Screws