5/16-18 18-8 Stainless Steel Flat Head Socket Cap Screws — 82° Countersunk — Partially Threaded
SKU: FN-SS-FHS-51618-PARTTHD· 9 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 →
$0.26/ea
1 pack × 100 = 100 pieces
5/16-18 18-8 stainless steel flat head socket cap screws (Allen head), 82° countersunk, partially threaded, ASME B18.3. Corrosion-resistant 18-8 (A2-70) stainless with a flush 82° flat countersunk head and 3/16" hex socket drive. 9 lengths (1-1/2"-4"). 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 — 9 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 — Partially Threaded | |||||||||
| 1-1/2" | 0.656 in | 0.198 in | Partially threaded | Hex Socket | 100 | FN-SS-FHS-51618-1.5-SS18-CS-PT-HEX-PL | $26.09$0.26/eapack of 100 · $0.26 ea | ||
| 1-3/4" | 0.656 in | 0.198 in | Partially threaded | Hex Socket | 50 | FN-SS-FHS-51618-1.75-SS18-CS-PT-HEX-PL | $16.80$0.34/eapack of 50 · $0.34 ea | ||
| 2" | 0.656 in | 0.198 in | Partially threaded | Hex Socket | 50 | FN-SS-FHS-51618-2-SS18-CS-PT-HEX-PL | $16.62$0.33/eapack of 50 · $0.33 ea | ||
| 2-1/4" | 0.656 in | 0.198 in | Partially threaded | Hex Socket | 50 | FN-SS-FHS-51618-2.25-SS18-CS-PT-HEX-PL | $25.75$0.52/eapack of 50 · $0.52 ea | ||
| 2-1/2" | 0.656 in | 0.198 in | Partially threaded | Hex Socket | 50 | FN-SS-FHS-51618-2.5-SS18-CS-PT-HEX-PL | $20.89$0.42/eapack of 50 · $0.42 ea | ||
| 2-3/4" | 0.656 in | 0.198 in | Partially threaded | Hex Socket | 50 | FN-SS-FHS-51618-2.75-SS18-CS-PT-HEX-PL | $23.65$0.47/eapack of 50 · $0.47 ea | ||
| 3" | 0.656 in | 0.198 in | Partially threaded | Hex Socket | 25 | FN-SS-FHS-51618-3-SS18-CS-PT-HEX-PL | $12.08$0.48/eapack of 25 · $0.48 ea | ||
| 3-1/2" | 0.656 in | 0.198 in | Partially threaded | Hex Socket | 25 | FN-SS-FHS-51618-3.5-SS18-CS-PT-HEX-PL | $12.48$0.50/eapack of 25 · $0.50 ea | ||
| 4" | 0.656 in | 0.198 in | Partially threaded | Hex Socket | 25 | FN-SS-FHS-51618-4-SS18-CS-PT-HEX-PL | $18.84$0.75/eapack of 25 · $0.75 ea | ||
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These items count toward the $500 bulk minimum. Mix-and-match to reach it.
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