Fasteners > Screws > Socket Countersunk Screws | Flat Head Socket Screw | Flat Head/ Countersunk Socket Screws (UNC/UNF) are manufactured to ANSI B18.3 / ASTM F835 | Made of high-grade alloy steel | Available in plain and Zinc finish. |
Fasteners > Screws > Socket Countersunk Screws | Flat Head Socket Screw | Flat Head/ Countersunk Socket Screws (UNC/UNF) are manufactured to ANSI B18.3 / ASTM F835 | Made of high-grade alloy steel | Available in plain and Zinc finish. |
in 2 offers
The lowest price for 5/16 x 2 1/2" UNC Flat Head Socket Screw Plain - Box of 100 right now is $5.50 at Bolt & Nut Australia, compared across 2 retailers.
The all-time low was $3.08 on 11 Nov 2025 — today's price is 79% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 8 May 2026.
5/16 x 2 1/2" UNC Flat Head Socket Screw Plain - Box of 100
Fasteners > Screws > Socket Countersunk Screws | Flat Head Socket Screw | Flat Head/ Countersunk Socket Screws (UNC/UNF) are manufactured to ANSI B18.3 / ASTM F835 | Made of high-grade alloy steel | Available in plain and Zinc finish. |
Fasteners > Screws > Socket Countersunk Screws | Flat Head Socket Screw | Flat Head/ Countersunk Socket Screws (UNC/UNF) are manufactured to ANSI B18.3 / ASTM F835 | Made of high-grade alloy steel | Available in plain and Zinc finish. |
Last updated at 08/05/2026 11:56:22
5/16" x 18 TPI x 2-1/2" Part Thread UNC Coarse Countersunk Head Socket Screw Grade 10.9 (3/16" Key) Plain Black Uncoated ANSI B 18.3
Free delivery between Tue – Thu
Hobsons - 5/16 x 2-1/2 Plain Ansi B18.3 / Astm F835 Unc Socket Screw Countersunk H | Knc516/212 (Pack Of 100)
Delivery between 9–18 May $7.95
| Fastener Size | 5/16" |
| Fastener Length | 2 1/2" |
| System of Measurement | UNC |
| Finish | Plain |
| Drive Type | Socket (Allen Key) |
5/16" x 18 TPI x 2-1/2" Part Thread UNC Coarse Countersunk Head Socket Screw Grade 10.9 (3/16" Key) Plain Black Uncoated ANSI B 18.3
Free delivery between Tue – Thu
Hobsons - 5/16 x 2-1/2 Plain Ansi B18.3 / Astm F835 Unc Socket Screw Countersunk H | Knc516/212 (Pack Of 100)
Delivery between 9–18 May $7.95
| Fastener Size | 5/16" |
| Fastener Length | 2 1/2" |
| System of Measurement | UNC |
| Finish | Plain |
| Drive Type | Socket (Allen Key) |
