5/16-18 18-8 Stainless Steel Flat Head Socket Cap Screws — 82° Countersunk — Fully Threaded
SKU: FN-SS-FHS-51618-FULLTHD· 8 lengths
Bulk-Only Item
Minimum order quantity: 100 pieces per pack. Ships 7 business days after your cart reaches the $500 bulk minimum — bulk-only and regularly-stocked items both count. Learn more →
$0.13/ea
1 pack × 100 = 100 pieces
5/16-18 18-8 stainless steel flat head socket cap screws (Allen head), 82° countersunk, fully threaded, ASME B18.3. Corrosion-resistant 18-8 (A2-70) stainless with a flush 82° flat countersunk head and 3/16" hex socket drive. 8 lengths (1/2"-1-3/8"). Length measured overall (head included) per countersunk convention. Ideal for OEM, machinery, and MRO applications.
Material
Stainless Steel
Finish
Plain / Natural
Grade
18-8 (A2-70)
Size
5/16-18
Drive Type
Hex Socket
Head Style
flat
Standard
ASME B18.3
Guides: What does 1/4-20 mean? · 18-8 stainless steel vs. other grades
Technical Specifications
Order any length — 8 in this family
Type the packs you need and press Add; sort any column.
| Head Dia. | Head Ht. | Threading | Drive | Packs | |||||
|---|---|---|---|---|---|---|---|---|---|
| 18-8 Stainless Steel | |||||||||
| 5/16-1818-8 Stainless Steel Flat Head Socket Cap Screws — 82° Countersunk — Fully Threaded | |||||||||
| 1/2" | 0.656 in | 0.198 in | Fully threaded | Hex Socket | 250 | FN-SS-FHS-51618-0.5-SS18-CS-FT-HEX-PL | $38.38$0.15/eapack of 250 · $0.15 ea | ||
| 5/8" | 0.656 in | 0.198 in | Fully threaded | Hex Socket | 100 | FN-SS-FHS-51618-0.625-SS18-CS-FT-HEX-PL | $12.89$0.13/eapack of 100 · $0.13 ea | ||
| 3/4" | 0.656 in | 0.198 in | Fully threaded | Hex Socket | 100 | FN-SS-FHS-51618-0.75-SS18-CS-FT-HEX-PL | $18.96$0.19/eapack of 100 · $0.19 ea | ||
| 7/8" | 0.656 in | 0.198 in | Fully threaded | Hex Socket | 100 | FN-SS-FHS-51618-0.875-SS18-CS-FT-HEX-PL | $17.26$0.17/eapack of 100 · $0.17 ea | ||
| 1" | 0.656 in | 0.198 in | Fully threaded | Hex Socket | 100 | FN-SS-FHS-51618-1-SS18-CS-FT-HEX-PL | $17.50$0.18/eapack of 100 · $0.18 ea | ||
| 1-1/8" | 0.656 in | 0.198 in | Fully threaded | Hex Socket | 100 | FN-SS-FHS-51618-1.125-SS18-CS-FT-HEX-PL | $22.67$0.23/eapack of 100 · $0.23 ea | ||
| 1-1/4" | 0.656 in | 0.198 in | Fully threaded | Hex Socket | 100 | FN-SS-FHS-51618-1.25-SS18-CS-FT-HEX-PL | $24.14$0.24/eapack of 100 · $0.24 ea | ||
| 1-3/8" | 0.656 in | 0.198 in | Fully threaded | Hex Socket | 100 | FN-SS-FHS-51618-1.375-SS18-CS-FT-HEX-PL | $39.78$0.40/eapack of 100 · $0.40 ea | ||
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These items count toward the $500 bulk minimum. Mix-and-match to reach it.
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