View Cart
Flat Socket Head Cap Screw 5/16-18X3 Alloy
Part Number: 721174
Specifications 721174
- Size: 5/16"-18
- Diameter: 5/16"
- Length: 3"
- Thread: UNC
-
Bolts
-
Hex Bolts
- Stainless Steel
- A286 Stainless Steel
- Inconel
- Silicon Bronze
- 17-4 Stainless Steel
- Aluminum 6061
- 2205 Duplex
- 2507 Super Duplex
- Monel 400
- Monel 500
- Grade 2
- Grade 5 & 8.8
- Grade 8 Plain
- Grade 8 & 10.9
- A307 Grade A Plain
- A307 Grade A Zinc Yellow
- A307 Grade A Hot Dipped Galvanized
- A307 Grade A Clear Zinc
- Heavy A193 Grade B7 Plain
- Heavy A307 Grade B Plain
- Heavy A307 Grade B Clear Zinc
- Heavy A307 Grade B Hot Dipped Galvanized
- Heavy Grade 5 Plain
- Heavy A354 Grade 8 Plain
-
Structural Bolts
- Heavy Hex Bolt A325 Type 1 Hot Dipped Galvanized
- Heavy Hex Bolt A325 Type 1 Plain
- Heavy Hex Bolt A490 Type 1 Plain
- Heavy Hex Bolt A490 Type 1 Plain (USA)
- TC Bolt A325 Round Head Plain (Import)
- TC Bolt A325 Round Head Plain (USA)
- TC Bolt A490 Round Head Plain (Import)
- TC Bolt A490 Round Head Plain (USA)
- Heavy Hex Bolt A325 Type 1 Hot Dipped Galvanized
- Assembled Heavy Hex Bolt A325 Hot Dipped Galvanized
- Heavy Hex Bolt A325 Type 1 Plain (USA)
- Assembled Heavy Hex Bolt A325 Plain
- Heavy Hex Bolt A325 W/ A563 Heavy Hex Nut HDG
- Heavy Hex Bolt A325 W/ A563 Heavy Hex Nut Plain
-
Carriage Bolts
- Grade 8 Plain
- Metric Stainless A4 (316) DIN 603
- A307 Grade A Plain
- A307 Grade A W/ Hex Nut Clear Zinc
- A307 Grade A Clear Zinc
- A307 Grade A Zinc Yellow
- A307 Grade A Hot Dipped Galvanized
- 18.8 Stainless Steel
- 316 Stainless Steel
- Grade 5 Zinc Yellow
- Grade 5 Plain
- Grade 5 Clear Zinc
- Grade 5 Hot Dipped Galvanized
- Metric 4.6 DIN 603 Clear Zinc
- Metric 8.8 DIN 603 Clear Zinc
-
Plow Bolts
- GRADE 8 DOME HEAD NO.3 PLOW BOLT PLAIN
- No.3 Head Grade 5 Plain
- No.3 Head Grade 5 Clear Zinc
- Grade 5 W/ Hex Nuts Clear Zinc
- 170,000 Psi Plain
- Clip Head Grade 5 Plain
- Clip Head Grade 5 Zinc Cr+3
- Clip Head Grade 5 Zinc Cr+3 (25Lb Kegs)
- Clipped Head Grade 5 w/ Hex Nuts Zinc Cr+3
- Elliptical Head Grade 5 Zinc Cr+3
- Elliptical Head Grade 5 Zinc Cr+3 (25Lb Kegs)
-
Flange Screws
- Grade 8 Indented Hex Flange Screw (Frame Bolt) Zinc-Yellow CR+6 Bake
- Stainless 18 8 Hex Head Serrated Flange Screw with Wax
- Metric Class 8.8 Hex Flange Bolt, Serrated, DIN 6921, Zinc CR+3
- Metric Class 8.8 Hex Serrated Flange Bolt, DIN 6921, Zinc-Yellow CR+6
- Metric Class 8.8 Hex Flange Bolt, Non Serrated, DIN 6921, Plain
- Metric Class 8.8 Hex Flange Bolt, Non Serrated, DIN 6921, Zinc CR+3
- Metric Class 8.8 Hex Flange Bolt, Non Serrated, DIN 6921, Zinc-Yellow CR+6
- Metric Class 10.9 Hex Flange Bolt, JIS B1189 Type 2, Zinc CR+3
- Metric Class 10.9 Hex Flange Bolt, Non Serrated, DIN 6921, Plain
- Metric Class 10.9 Hex Flange Screw, Non Serrated, DIN 6921, Zinc CR+3
- Hex Head Serrated Flange Screw, Grade 5, Clear Zinc
- Indented Hex Grade 8 Black Phosphate & Oil
- Metric 10.9 Hex Non Serrated Zinc Yellow
-
Hex Bolts
-
Nuts
-
Finished Hex Nuts
- Grade 2 Plain (Inch)
- Grade 2 Zinc Cr+3 (Inch)
- Grade 2 Zinc Yellow Cr+6 (Inch)
- Grade 2 HDG (Inch)
- Grade 5 Plain (Inch)
- Grade 5 Zinc Cr+3 (Inch)
- Grade 5 Taiwan, Zinc Cr+3 (Inch)
- Grade 5 Zinc Yellow Cr+6 (Inch)
- Grade 5 Plain (Inch) (USA)
- Grade 5 Zinc Cr+3 (Inch) (USA)
- Grade 8 Plain (Inch)
- Grade 8 Zinc Bake Cr+3(Inch)
- Grade 8 Zinc Yellow Cr+6 (Inch)
- Grade 8 Plain (Usa)
- Grade 8 Zinc Yellow Cr+6 (Usa)
- Grade 8 Hardened, Plain
- Brass
- Silicon Bronze (Inch)
- Left Hand, Plain
- Left Hand, Zinc Cr+3
- Metric Class 6, Din 934
- Metric Class 6, Din 934 Zinc Cr+3
- Metric Class 8, Din 934 Plain
- Metric Class, Din 934 Zinc Cr+3
- Metric Class 8, Din 934 Zinc Yellow
- Metric Class 10, Din 934 Plain
- Metric Class 10, Din 934 Zinc Cr+3
- Metric Class 10, Din 934, Zinc Yellow
-
Structural And Heavy Hex Nuts
- Brass
- 2H A194 Plain
- 2H A194 Plain Taiwan/Korea
- 2H A194 Clear Zinc Cr+3
- 2H A194 Hot Dipped Galvanized
- 2H A194 Plain (USA)
- 2H A194 Hot Dipped Galvanized Blue Dye & Wax
- A563 A, Plain
- A563 A Clear Zinc Cr+3
- A563 A Zinc Yellow
- A563 A Hot Dipped Galvanized
- Grade C A563 Plain
- Grade C A563 Clear Zinc Cr+3
- Grade C A563 Plain (usa)
- Grade DH A563 Plain
- Grade DH A563 Hot Dipped Galvanized Wax & Blue Dye
- Grade DH A563 Plain (Usa)
- Grade DH A563 Hot Dipped Galvanized / Wax & Blue Dye (usa)
-
All Metal Locknuts
- Grade G Hex Flange Cone Without Serration, "2 Opposite Oval Lock", Phos & Oil
- Metric Class 8, DIN 980 V, Zinc-Yellow CR+6 & Wax
- Metric Class 10, DIN 980 V, Zinc-Yellow CR+6 & Wax
- Metric Class 10 Hex Flange Top, DIN 6927/DIN En 1664, Plain
- Metric Class 10 Hex Flange, DIN 6927/DIN En 1664, Zinc CR+3
- Serrated Flange Hex, Case Hardened, Zinc Cr+3
- Serrated Flange Hex, Js500, Case Hardened Zinc Cr+3
- External Tooth Keps Hex, Zinc Cr+3
- Grade C Hex All Metal Cone, Zinc/Wax Cr+3
- Grade C Hex All Metal Cone, Taiwan, Zinc/Wax Cr+3
- Grade A, Reversible Hex, Zinc Cr+3
- Flexloc, Full Height, Plain
- Flexloc, Full Height, Cadmium
- Metric Class 8 Din 980 V Zinc Cr+3 & Waxed
- Metric Class 10 Din 980 V Zinc Cr+3 & Waxed
- Metric Class 8 External Tooth Keps Hex, Zinc Cr+3
- Metric Class 8 Hex Flange Din 6927 Zinc Cr+3
-
Nylon Insert Locknuts
- Metric Class 10, Non Serrated, DIN 6926, Zinc-Yellow CR+6
- Metric Class 8, Non Serrated, DIN 6926, Zinc-Yellow CR+6
- Metric Class 8, Non Serrated, DIN 6926, Zinc CR+3
- Grade A, Zinc Cr+3
- Grade A, Zinc Yellow
- Grade A, J500
- Grade C, Plain
- Grade C, Ne, Phosphate & Oil
- Grade C, Ne, Zinc Yellow
- Metric Class 8, Zinc Cr+3
- Metric Class 8, Zinc Yellow
- Metric Class 10, Zinc Cr+3
-
Metric Flange Nuts
- Metric Class 8, Non Serrated, DIN 6923, Plain
- Metric Class 8, Non Serrated, DIN 6923, Zinc-Yellow CR+6
- Metric Class 8, DIN 6923, Plain
- Metric Class 8, DIN 6923, Zinc-Yellow CR+6
- Metric Class 10, Non Serrated, DIN 6923, Plain
- Metric Class 10, Non Serrated, DIN 6923, Zinc CR+3
- Metric Class 10, Non Serrated, DIN 6923, Zinc-Yellow CR+6
- Class 8 Hex, Din 6923 Zinc Cr+3
- Class 8 Hex Serrated, Din 6923, Zinc Cr+3
-
Hex Jam Nuts
- Brass
- Grade 5 Finished, Plain
- Grade 5, Zinc CR+3
- Grade 8, Plain
- Grade 8, Zinc-Yellow CR+6
- Metric Class 04, DIN 439B, Plain
- Finished, Plain
- Finished, Zinc Cr+3
- Finished, Zinc Yellow
- Finished, Hdg
- Heavy, A563 Grade A, Plain
- Heavy, A563 Grade A, Zinc
- Hex Panel Nut, Zinc Cr+3
- Metric Class 04, Din 439B Zinc Cr+3
-
Finished Hex Nuts
-
Washers
-
Lockwashers
- Nord-Lock Steel Washers
- Nord-Lock Stainless Steel Washers
- 651 Silicon Bronze
- Phosphor Bronze
- Wedge Lock Washer
- Stainless Steel
- Plain, Regular
- Thru Hardened, Heat Treat, Zinc Yellow
- Regular, HDG
- Monel Lock Washer
- Zinc Cr+3, Regular
- Plain, External Tooth
- Plain, Internal Tooth
- Zinc Cr+3, Internal Tooth
- Zinc Cr+3, External Tooth
- Zinc Cr+3, Internal/External Tooth
- Zinc Cr+3, Metric Din 6797A External Tooth
- Zinc Cr+3, Metric Din 6798A External Tooth Serrated
- Zinc Cr+3, Metric Din 6797J Internal Tooth
- Zinc Yellow, Metric Split, Din 127B
- Split Lock Washer - Regular, Plain
- Split Lock Washer - Plain, Hi Collar, Thru Hardened
- Split Lock Washer - Zinc Yellow, Hi Collar, Thru Hardened
- Split Lock Washer - Plain, Regular, Heat Treated (USA)
- Split Lock Washer - Heavy, Thru Hardened, Plain
- Metric Split, Thru Hardened Din 127 Plain
- Metric Split Lock Washers - Zinc Cr+3,Thru Hardened Din 127
- Metric Hi Collar - Din 7980 Plain
-
Flat Washers (Thru Hardened)
- F436 Plain Structural
- F436 Zinc/Yellow Cr+6 Structural
- F436 HDG Structural
- F436 Plain Structural (USA)
- F436 HDG Structural (USA)
- USS, Plain (USA)
- USS, Plain, Medium Carbon (Import)
- USS, Zinc Cr+3 (USA)
- USS, Zinc/Yellow (USA)
- USS, Zinc/Yellow (Import)
- SAE, Plain (Import)
- SAE, Plain (USA)
- SAE, Zinc Cr+3 (USA)
- SAE Zinc/Yellow (USA)
- SAE Zinc/Yellow (Import)
- Extra Heavy, Zinc/Yellow, Medium Carbon (USA)
- Metric, Asme B18.22M, Narrow, Zinc/Blue Cr+3 (Usa)
-
Flat Washers
- USS , Plain, Low Carbon
- USS, Zinc Clear Cr+3, Low Carbon
- USS, Zinc Yellow
- USS, HDG, Low Carbon
- SAE, Plain, Low Carbon
- Monel 400
- Monel K500
- SAE, Zinc Cr+3, Low Carbon
- SAE, Zinc Yellow
- SAE, HDG, Low Carbon
- PKG, USS, Plain, Low Carbon
- PKG, USS, Zinc Clear Cr+3, Low Carbon
- PKG, USS, HDG, Low Carbon
- PKG, SAE, Plain, Low Carbon
- PKG, SAE, Zinc Cr+3, Low Carbon
- Plain Fender Washer
- Fender Washer, Zinc Cr+3
- Solid Brass
- Silicon Bronze
- Finishing Washers, Stainless Steel 18 8
- Metric Fender Washer Din 9021B Grade A Zinc Cr+3
- Metric Din 125A, 140 Hv Zinc Cr+3
- Metric Din 125A, 140 Hv Zinc Yellow
- Metric Din 125A, 200 Hv Plain
- Metric Din 125A, 200 Hv Zinc Cr+3
- Metric Din 125A, 200Hv Zinc Yellow
- Metric Din 7349,Thick, Zinc Cr+3
- Metric Din 433, Small, Zinc Cr+3
- Metric Din 9021B, Fender Washer, Zinc Cr+3
-
Flat Washers (Stainless)
- Stainless 18 8 Brighton Best Standard
- Stainless 316, Fender Standard
- Stainless 18 8, Epdm Bonded
- Metric Stainless A2 Small, DIN 433
- Metric Stainless A2 (18 8) Thick, DIN 7349
- Metric Stainless A2 (18 8), DIN 9021B
- Metric Stainless A4 (316), DIN 9021B
- 18.8 Standard
- 18 8 Commercial Standard
- 18 8 Fender Standard
- 18 8 An960
- 18 8 Ms15795
- 18 8 Nas620
- 18 8 N400
- 18 8 An960L
- 316 Commercial Standard
- SAE 18 8
- SAE 316
- Metric Stainless A2, Asme B18.22M, Narrow
- Metric Din 125A, A2
- Metric Din 125A, A4
-
Lockwashers
-
Rods And Studs
-
Threaded Rods
- USA F1554 Grade 105 / A193 Grade B7 Threaded Rod, Plain
- USA F1554 Grade 55 S1 Threaded Rod, HDG
- USA F1554 Grade 55 S1 Threaded Studs, HDG (End To End)
- USA F1554 Grade 55 S1 Threaded Rod, Plain
- Metric Grade B7, A193M, Plain
- Stainless 304 B8, ASTM A193
- Stainless 316 B8M, ASTM A193
- Metric, DIN 975, Plain
- Metric Stainless A4 (316), DIN 975
- F1554 Grade 36, Plain
- F1554 Grade 36, Zinc CR+3
- A307 Grade A Threaded Rod, Plain
- A307 Grade A Threaded Rod, Zinc Clear
- A307 Grade A Threaded Rod, Hdg
- A193 Grade B7 Threaded Rod, Plain
- Stainless 304 Threaded Rod, Astm F593
- Stainless 316 Threaded Rod, Astm F593
- Metric Thread Rod Zinc Cr+3 Din 975
- Metric Stainless A2 Threaded Rod, Din 975
-
Threaded Rods
-
Screws
-
Socket Head Cap Screws
- 18.8 Stainless Steel
- A286 Stainless Steel
- 316 Stainless Steel
- Monel 400
- Monel K500
- Thermal Black Oxide
- 2507 Super Duplex
- Silicon Bronze
- 2205 Duplex
- Nylon Patch, Black Oxide
- 1936 Series, Thermal Black Oxide
- Mechanical Zinc
- Nylon Pellet, Thermal Black Oxide
- Whitworth Thread, Thermal Black Oxide
- Zinc Bake Cr+3
- Zinc Yellow
- Tamper Resistant, Thermal Black Oxide
- Tamper Resistant, 18.8 Stainless Steel
- Nylon Patch, 18.8 Stainless Steel
- Metric 8.8 DIN 912 Thermal Black Oxide
- Metric 12.9 DIN 912 Thermal Black Oxide
- Metric 12.9 DIN 912 Clear Zinc Bake Cr+3
- Metric 12.9 Din 912 Clear Zinc Bake Cr+6
- Metric A2 Stainless DIN 912
-
Square Head Set Screws
- Cup Point Square Head Set Screw, Case Hardened, Plain
- Cup Point Square Head Set Screw, Case Hardened, Fine Thread, Plain
- 1/2 Dog Point Square Head Set Screw, Case Hardened, Plain
- Flat Point Square Head Set Screw, Case Hardened, Plain
- Cone Point Square Head Set Screw, Case Hardened, Plain
- Oval Point Square Head Set Screw, Case Hardened Plain
- Cup Point Square Head Set Screw, Plain
- Stainless 18 8 Cup Point Square Head Set Screw
-
Socket Head Cap Screws
-
Assorted Fasteners
-
Anchors
- Chemical Anchors
- Stud Anchors
- Sleeve Anchors
- Wedge Anchors
- Conical Plastic Anchors
- Hammer Drive Anchors
- Machine Screw Anchors
- Anchor Bolts
- Hollow Wall Anchors
- Concrete Screws
- Lag Screw Shield
- Drop In Anchors
- U Drive
- Expansion Shield Anchor
- Toggle Wing
- Wood Screw Anchors
- Mungo Products
- Nylon Nail Anchors
- E Z Ancor
- Eye Couplings
-
Anchors
- Tools & Equipment
-
Materials
-
Hot Dip Galvanizing
- A307 Grade A Hex Bolts
- Hex Lag Screw
- Timber Bolts, A307 Grade A
- Hex Coupling Nuts, A563
- Hex Head Tap Bolt, A307 Grade A,
- L Shaped Anchor Bolts W/ Nut / Washer
- A307 Grade A Carriage Bolts
- A325 Type 1 Heavy Hex Bolts
- A325 Type 1 Heavy Hex Structural Bolts (USA)
- Wedge Anchors, Ultrawedge, Steel
- Grade 2, Finished Hex Nut
- Square Head Bolts, A307 Grade A
- 2H Heavy Hex Nut, A194 / Sa 194
- Heavy Hex Nut, A563 A
- Round Plate Washers
- Square Nuts, Grade 2
- Ogee Washer, Class 30 Grey Iron
- USA F436 Structural Flat Washer
- USA 2H Heavy Hex Nut, A194 / Sa 194, Blue Dye & Wax
- Square Plate Washer
- Grade Dh Heavy Hex Nut, A563, Wax&Blue Dye
- Uss Flat Washer, Low Carbon
- Split Lock Washer, Regular
- F436 Structural Flat Washer
- Square Beveled Malleable Washer
- Sae Flat Washer, Low Carbon
- A307 Grade A Threaded Rod
- Nuts
-
Black Oxide
- Socket Head Cap Screws, 1936 Series
- Socket Head Cap Screw with Nylon Patch
- Flat Socket Cap with Nylon Patch
- Tamper Resistant Flat Socket Cap
- USA Flat Socket Cap
- Flat Socket Cap
- Full Dog Socket Set Screws
- Low Head Socket Cap
- Oval Point Socket Set Screws
- Socket Shoulder Screws, Nylon Patch
- Socket Shoulder Screws, Nylon Pellet
- Socket Shoulder Screws
- Socket Head Cap Screws
- USA Socket Cap Screw
- Button Socket Cap, Nylon Patch
- Button Socket Cap, Nylon Pellet
- Button Socket Cap, Tamper Resistant
- Button Socket Cap
- Cup Point Socket Set Screws, Cup Point, Nylon Patch
- Cup Point Socket Set Screws, Nylon Pellet
- Cup Point Socket Set Screws
- Flat Point Socket Set Screws, Nylon Patch
- Flat Point Socket Set Screws
- Half Dog Socket Set Screws
- Knurled Cup Point Socket Set Screws
- Loc Wel Knurled Cup Point Socket Set Screws
- Metric 10.9 Flat Socket Cap
- Metric 10.9 Low Head Socket Cap, Din 7984
- Metric 10.9 Low Head Socket Cap, Sip147
- Metric 12.9 Button Socket Cap, Iso 7380
- Metric 12.9 Flat Socket Cap, Din 7991
- Metric 12.9 Socket Shoulder Screws, Iso 7379
- Socket Head Cap Screws Din 912
- Metric Cone Point Socket Set Screws, 45H Iso 4027 / Din 914
- Metric Flat Point Socket Set Screws, 45H Iso 4026 / Din 913
- Metric Knurled Cup Point Socket Set Screws, 45H Iso 4029
- Metric Nylon Tip Set Screws
- Socket Head Cap Screws with Nylon Pellet
- Nylon Tip Set Screws
- Oval Point Socket Set Screws, Nylon Patch
- Tamper Resistant Socket Head Cap Screws
- Socket Head Cap Screws with Whitworth Thread
- Cone Point Socket Set Screws, Nylon Patch
- Cone Point Socket Set Screws
- Metric Cup Point Set Screws, 45H Iso 4029 / Din 916
- Half Dog Socket Set Screws, Nylon Patch
- Metric 12.9 Socket Head Cap Screws, Iso 4762 / Din 912
- Metric Dog Point Socket Set Screws, 45H Iso 4028 / Din 915
- Flat Socket Cap with Nylon Pellet
-
Hot Dip Galvanizing
Copyright 2026 Fastener Solutions Inc. All Rights Reserved.
FASTENER SOLUTIONS
Phone: 866-463-2910
Fax: 800-660-6788
info@fastenersolutions.com
Fax: 800-660-6788
info@fastenersolutions.com