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Specifications Met Specifications Met |
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System of Measurement System of Measurement |
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Head Type Head Type |
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![]() | Flat |
Material Material |
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Finish Finish |
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Drive Style Drive Style |
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Flat Head Profile Flat Head Profile |
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![]() | Standard |
Threading Threading |
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![]() | Fully Threaded |
![]() | Partially Threaded |
Thread Direction Thread Direction |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Thread Fit Thread Fit |
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Hardness Hardness |
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Thread Type Thread Type |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Tensile Strength Tensile Strength |
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Thread Spacing Thread Spacing |
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About Flat Head Screws
More
Mil. Spec. Stainless Steel Hex Drive Flat Head Screws

Choose these screws for their adherence to strict military standards for material and construction. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. All are passivated for added protection against oxidation and corrosion. Screws are angled under the head to sit flush within countersunk holes. Length is measured from the top of the head.
For technical drawings and 3-D models, click on a part number.
Lg. | Threading | Min. Thread Lg. | Head Dia. | Head Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Each | |
18-8 Stainless Steel | |||||||||
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4-40 | |||||||||
1/4" | Fully Threaded | __ | 0.255" | 0.083" | 1/16" | 70,000 | Fed. Spec. QQ-P-35, MS24671-1 | 000000000 | 00000 |
3/8" | Fully Threaded | __ | 0.255" | 0.083" | 1/16" | 70,000 | Fed. Spec. QQ-P-35, MS24671-2 | 000000000 | 0000 |
1/2" | Fully Threaded | __ | 0.255" | 0.083" | 1/16" | 70,000 | Fed. Spec. QQ-P-35, MS24671-3 | 000000000 | 0000 |
5/8" | Fully Threaded | __ | 0.255" | 0.083" | 1/16" | 70,000 | Fed. Spec. QQ-P-35, MS24671-4 | 000000000 | 0000 |
3/4" | Fully Threaded | __ | 0.255" | 0.083" | 1/16" | 70,000 | Fed. Spec. QQ-P-35, MS24671-5 | 000000000 | 0000 |
6-32 | |||||||||
1/4" | Fully Threaded | __ | 0.307" | 0.097" | 5/64" | 70,000 | Fed. Spec. QQ-P-35, MS24671-7 | 000000000 | 0000 |
3/8" | Fully Threaded | __ | 0.307" | 0.097" | 5/64" | 70,000 | Fed. Spec. QQ-P-35, MS24671-8 | 000000000 | 0000 |
1/2" | Fully Threaded | __ | 0.307" | 0.097" | 5/64" | 70,000 | Fed. Spec. QQ-P-35, MS24671-9 | 000000000 | 0000 |
5/8" | Fully Threaded | __ | 0.307" | 0.097" | 5/64" | 70,000 | Fed. Spec. QQ-P-35, MS24671-10 | 000000000 | 0000 |
3/4" | Fully Threaded | __ | 0.307" | 0.097" | 5/64" | 70,000 | Fed. Spec. QQ-P-35, MS24671-11 | 000000000 | 0000 |
8-32 | |||||||||
3/8" | Fully Threaded | __ | 0.359" | 0.112" | 3/32" | 70,000 | Fed. Spec. QQ-P-35, MS24671-13 | 000000000 | 0000 |
1/2" | Fully Threaded | __ | 0.359" | 0.112" | 3/32" | 70,000 | Fed. Spec. QQ-P-35, MS24671-14 | 000000000 | 0000 |
3/4" | Fully Threaded | __ | 0.359" | 0.112" | 3/32" | 70,000 | Fed. Spec. QQ-P-35, MS24671-16 | 000000000 | 0000 |
1" | Partially Threaded | 3/4" | 0.359" | 0.112" | 3/32" | 70,000 | Fed. Spec. QQ-P-35, MS24671-17 | 000000000 | 0000 |
10-24 | |||||||||
3/8" | Fully Threaded | __ | 0.411" | 0.127" | 1/8" | 70,000 | Fed. Spec. QQ-P-35, MS24671-19 | 000000000 | 0000 |
1/2" | Fully Threaded | __ | 0.411" | 0.127" | 1/8" | 70,000 | Fed. Spec. QQ-P-35, MS24671-20 | 000000000 | 0000 |
5/8" | Fully Threaded | __ | 0.411" | 0.127" | 1/8" | 70,000 | Fed. Spec. QQ-P-35, MS24671-21 | 000000000 | 0000 |
3/4" | Fully Threaded | __ | 0.411" | 0.127" | 1/8" | 70,000 | Fed. Spec. QQ-P-35, MS24671-22 | 000000000 | 0000 |
1" | Fully Threaded | __ | 0.411" | 0.127" | 1/8" | 70,000 | Fed. Spec. QQ-P-35, MS24671-23 | 000000000 | 0000 |
1/4"-20 | |||||||||
1/2" | Fully Threaded | __ | 0.531" | 0.161" | 5/32" | 70,000 | Fed. Spec. QQ-P-35, MS24671-28 | 000000000 | 0000 |
5/8" | Fully Threaded | __ | 0.531" | 0.161" | 5/32" | 70,000 | Fed. Spec. QQ-P-35, MS24671-29 | 000000000 | 0000 |
3/4" | Fully Threaded | __ | 0.531" | 0.161" | 5/32" | 70,000 | Fed. Spec. QQ-P-35, MS24671-30 | 000000000 | 0000 |
1" | Fully Threaded | __ | 0.531" | 0.161" | 5/32" | 70,000 | Fed. Spec. QQ-P-35, MS24671-31 | 000000000 | 0000 |
1 1/2" | Partially Threaded | 1" | 0.531" | 0.161" | 5/32" | 70,000 | Fed. Spec. QQ-P-35, MS24671-33 | 000000000 | 0000 |
5/16"-18 | |||||||||
3/4" | Fully Threaded | __ | 0.656" | 0.198" | 3/16" | 70,000 | Fed. Spec. QQ-P-35, MS24671-40 | 000000000 | 00000 |
1" | Fully Threaded | __ | 0.656" | 0.198" | 3/16" | 70,000 | Fed. Spec. QQ-P-35, MS24671-41 | 000000000 | 00000 |
1 1/2" | Partially Threaded | 1 1/4" | 0.656" | 0.198" | 3/16" | 70,000 | Fed. Spec. QQ-P-35, MS24671-43 | 000000000 | 00000 |
3/8"-16 | |||||||||
3/4" | Fully Threaded | __ | 0.781" | 0.234" | 7/32" | 70,000 | Fed. Spec. QQ-P-35, MS24671-51 | 000000000 | 00000 |
1" | Fully Threaded | __ | 0.781" | 0.234" | 7/32" | 70,000 | Fed. Spec. QQ-P-35, MS24671-52 | 000000000 | 00000 |