Sort by:

Socket Screws

Button head socket cap screws to ASME B18.3 and B18.6.3, UNC and UNF from #2-56 to 5/8-11. The low-profile rounded head suits guards, panels and assemblies where a protruding head is unacceptable. Stocked in 40CrMo / 35CrMo alloy steel and 304 stainless, with zinc plated, yellow zinc, black oxide and Dacromet finishes; ASTM A193 B7 variants cover higher-load joints.

Request a Quote Send Drawing
Button Head Socket Cap Screw — Round Head Allen Screws Carbon Steel 8.8 Grade Yellow Zinc Chromate UNC UNF ASME B18.6.3 Button Head Socket Fasteners Heavy Duty
11/21/41-1/21-3/82-1/23/43/83-1/4

Round Head Allen Screws Carbon Steel 8.8 Grade Yellow Zinc Chromate UNC UNF ASME B18.6.3 Button Head Socket Fasteners Heavy Duty

$0.00
Round Head Allen Screws Carbon Steel 8.8 Grade Yellow Zinc Chromate UNC UNF ASME B18.6.3 Button Head Socket Fasteners Heavy Duty Material: Carbon Steel Grade / Class: Grade 8.8 Standards:...
Quick view Read more
Button Head Socket Cap Screw — Round Head Allen Socket Cap Screws Carbon Steel Yellow Zinc Plated Finish UNC UNF Class 2A ASME B18.6.3 Imperial Inch Threads
11/21/41-1/21-1/41-3/41-1/83/43/8

Round Head Allen Socket Cap Screws Carbon Steel Yellow Zinc Plated Finish UNC UNF Class 2A ASME B18.6.3 Imperial Inch Threads

$0.00
Round Head Allen Socket Cap Screws Carbon Steel Yellow Zinc Plated Finish UNC UNF Class 2A ASME B18.6.3 Imperial Inch Threads Material: Carbon Steel Grade / Class: Grade 8 Standards:...
Quick view Read more
Button Head Socket Cap Screw — Dome Head Socket Screws Carbon Steel Gold Zinc Plated UNC Thread ASME B18.6.3 Round Head Allen Bolts Yellow Chromate Finished
11/21/41-7/81-3/82-1/22-1/43/43/8

Dome Head Socket Screws Carbon Steel Gold Zinc Plated UNC Thread ASME B18.6.3 Round Head Allen Bolts Yellow Chromate Finished

$0.00
Dome Head Socket Screws Carbon Steel Gold Zinc Plated UNC Thread ASME B18.6.3 Round Head Allen Bolts Yellow Chromate Finished Material: Carbon Steel Standards: ASME B18.6.3 Thread Series: UNC Finish...
Quick view Read more
Button Head Socket Cap Screw — Round Head Allen Socket Screws Carbon Steel Yellow Zinc Plated UNC UNF ASME B18.6.3 Button Head Cap Screws
11/21/41-1/21-1/41-3/41-1/83/43/8

Round Head Allen Socket Screws Carbon Steel Yellow Zinc Plated UNC UNF ASME B18.6.3 Button Head Cap Screws

$0.00
Round Head Allen Socket Screws Carbon Steel Yellow Zinc Plated UNC UNF ASME B18.6.3 Button Head Cap Screws Material: Carbon Steel Standards: ASME B18.6.3 Thread Series: UNC, UNF Finish /...
Quick view Read more
Button Head Socket Cap Screw — Round Head Socket Bolts Carbon Steel Zinc Plated Golden Yellow UNC UNF ASME B18.6.3 Industrial Automotive Furniture Screws
#4#811/21/42-1/22-1/43/43/8

Round Head Socket Bolts Carbon Steel Zinc Plated Golden Yellow UNC UNF ASME B18.6.3 Industrial Automotive Furniture Screws

$0.00
Round Head Socket Bolts Carbon Steel Zinc Plated Golden Yellow UNC UNF ASME B18.6.3 Industrial Automotive Furniture Screws Material: Carbon Steel Standards: ASME B18.6.3 Thread Series: UNC, UNF Finish /...
Quick view Read more
Button Head Socket Cap Screw — Round Head Socket Screws Carbon Steel Yellow Zinc Plated UNC UNF ASME B18.6.3 Button Head Allen Bolts Industrial Fasteners
#1#811/21/41-1/21-1/43/43/8

Round Head Socket Screws Carbon Steel Yellow Zinc Plated UNC UNF ASME B18.6.3 Button Head Allen Bolts Industrial Fasteners

$0.00
Round Head Socket Screws Carbon Steel Yellow Zinc Plated UNC UNF ASME B18.6.3 Button Head Allen Bolts Industrial Fasteners Material: Carbon Steel Standards: ASME B18.6.3 Thread Series: UNC, UNF Finish...
Quick view Read more
Button Head Socket Cap Screw — Round Head Socket Cap Screws Carbon Steel Yellow Zinc Plated UNC UNF ASME B18.6.3 #2 #4 #6 #8 #10 1/4 3/16 5/16 3/8 Inch Sizes
#2#4#6#8#101/43/165/163/8

Round Head Socket Cap Screws Carbon Steel Yellow Zinc Plated UNC UNF ASME B18.6.3 Inch Sizes

$0.00
Round Head Socket Cap Screws Carbon Steel Yellow Zinc Plated UNC UNF ASME B18.6.3 Inch Sizes Material: Carbon Steel Standards: ASME B18.6.3 Thread Series: UNC, UNF Finish / Coating: Yellow...
Quick view Read more
Button Head Socket Cap Screw — Round Head Socket Cap Screws Carbon Steel Colored Zinc Plated UNC UNF ASME B18.6.3 Button Head Allen Bolts for Furniture
#4#12#14#1811/21/43/43/8

Round Head Socket Cap Screws Carbon Steel Colored Zinc Plated UNC UNF ASME B18.6.3 Button Head Allen Bolts for Furniture

$0.00
Round Head Socket Cap Screws Carbon Steel Colored Zinc Plated UNC UNF ASME B18.6.3 Button Head Allen Bolts for Furniture Material: Carbon Steel Grade / Class: Grade 8.8 Standards: ASME...
Quick view Read more
Button Head Socket Cap Screw — Button Head Socket Cap Screws Carbon Steel Yellow Zinc Chromate UNC Thread ASME B18.6.3 Round Head Allen Bolts Gold Color
11/21/41-1/21-1/41-3/41-1/83/43/8

Button Head Socket Cap Screws Carbon Steel Yellow Zinc Chromate UNC Thread ASME B18.6.3 Round Head Allen Bolts Gold Color

$0.00
Button Head Socket Cap Screws Carbon Steel Yellow Zinc Chromate UNC Thread ASME B18.6.3 Round Head Allen Bolts Gold Color Material: Carbon Steel Standards: ASME B18.6.3 Thread Series: UNC Finish...
Quick view Read more
Button Head Socket Cap Screw — High Tensile Button Head Socket Cap Screw 40CrMo UNF 1/4-28 3/8-24 1/2-20 Zinc Plated ASME B18.6.3
1/4-283/8-241/2-20

High Tensile Button Head Socket Cap Screw 40CrMo UNF Zinc Plated ASME B18.6.3

$0.00
High Tensile Button Head Socket Cap Screw 40CrMo UNF Zinc Plated ASME B18.6.3 Material: 40CrMo Alloy Steel Standards: ASME B18.6.3 Thread Series: UNF Finish / Coating: Zinc Plated
Quick view Read more
Button Head Socket Cap Screw — High Strength Button Head Hex Socket Cap Screw 40CrMo UNC/UNF 1/4 to 5/8 Zinc Plated ASME B18.6.3
1/45/8

High Strength Button Head Hex Socket Cap Screw 40CrMo UNC/UNF Zinc Plated ASME B18.6.3

$0.00
High Strength Button Head Hex Socket Cap Screw 40CrMo UNC/UNF Zinc Plated ASME B18.6.3 Material: 40CrMo Alloy Steel Standards: ASME B18.6.3 Thread Series: UNC, UNF Finish / Coating: Zinc Plated...
Quick view Read more
Button Head Socket Cap Screw — Industrial Grade Hex Socket Button Head Screw B7 Alloy UNC 3/8-16 1/2-13 5/8-11 Zinc Plated ASME
3/8-161/2-135/8-11

Industrial Grade Hex Socket Button Head Screw B7 Alloy UNC Zinc Plated ASME

$0.00
Industrial Grade Hex Socket Button Head Screw B7 Alloy UNC Zinc Plated ASME Material: Alloy Steel Grade / Class: ASTM A193 B7 Thread Series: UNC Finish / Coating: Zinc Plated...
Quick view Read more
Button Head Socket Cap Screw — Corrosion Resistant Zinc Plated Button Head Cap Screw 35CrMo UNC 1/4-20 to 5/8-11 ASME B18.6.3
1/4-205/8-11

Corrosion Resistant Zinc Plated Button Head Cap Screw 35CrMo UNC ASME B18.6.3

$0.00
Corrosion Resistant Zinc Plated Button Head Cap Screw 35CrMo UNC ASME B18.6.3 Material: 35CrMo Alloy Steel Standards: ASME B18.6.3 Thread Series: UNC Finish / Coating: Zinc Plated
Quick view Read more
Button Head Socket Cap Screw — UNF Fine Thread Button Head Socket Cap Screw 40CrMo 5/16-24 3/8-24 1/2-20 Zinc Plated ASME B18.6.3
5/16-243/8-241/2-20

UNF Fine Thread Button Head Socket Cap Screw 40CrMo Zinc Plated ASME B18.6.3

$0.00
UNF Fine Thread Button Head Socket Cap Screw 40CrMo Zinc Plated ASME B18.6.3 Material: 40CrMo Alloy Steel Standards: ASME B18.6.3 Thread Series: UNF Finish / Coating: Zinc Plated
Quick view Read more
Button Head Socket Cap Screw — Hexagon Socket Button Head Cap Screw UNF 1/4-28 3/8-24 1/2-20 5/8-18 Zinc Plated 40CrMo ASME B18.6.3
1/4-283/8-241/2-205/8-18

Hexagon Socket Button Head Cap Screw UNF Zinc Plated 40CrMo ASME B18.6.3

$0.00
Hexagon Socket Button Head Cap Screw UNF Zinc Plated 40CrMo ASME B18.6.3 Material: 40CrMo Alloy Steel Standards: ASME B18.6.3 Thread Series: UNF Finish / Coating: Zinc Plated
Quick view Read more
Button Head Socket Cap Screw — ASME B18.6.3 Button Head Hex Socket Cap Screw 35CrMo UNC 1/4-20 5/16-18 3/8-16 Zinc Plated
1/4-205/16-183/8-16

ASME B18.6.3 Button Head Hex Socket Cap Screw 35CrMo UNC Zinc Plated

$0.00
ASME B18.6.3 Button Head Hex Socket Cap Screw 35CrMo UNC Zinc Plated Material: 35CrMo Alloy Steel Standards: ASME B18.6.3 Thread Series: UNC Finish / Coating: Zinc Plated
Quick view Read more
Button Head Socket Cap Screw — 35CrMo High Strength Hex Socket Button Head Cap Screw UNF 1/4-28 5/16-24 Zinc Plated ASME B18.6.3
1/4-285/16-24

35CrMo High Strength Hex Socket Button Head Cap Screw UNF Zinc Plated ASME B18.6.3

$0.00
35CrMo High Strength Hex Socket Button Head Cap Screw UNF Zinc Plated ASME B18.6.3 Material: 35CrMo Alloy Steel Standards: ASME B18.6.3 Thread Series: UNF Finish / Coating: Zinc Plated
Quick view Read more
Button Head Socket Cap Screw — Zinc Plated Button Head Cap Screw UNC 1/4-20 5/16-18 3/8-16 1/2-13 5/8-11 Alloy Steel 35CrMo ASME
1/4-205/16-183/8-161/2-135/8-11

Zinc Plated Button Head Cap Screw UNC Alloy Steel 35CrMo ASME

$0.00
Zinc Plated Button Head Cap Screw UNC Alloy Steel 35CrMo ASME Material: 35CrMo Alloy Steel Thread Series: UNC Finish / Coating: Zinc Plated
Quick view Read more
Button Head Socket Cap Screw — ASTM A193 B7 Grade Alloy Steel Button Head Cap Screw UNC 5/16-18 1/2-13 Zinc Plated ASME B18.6.3
5/16-181/2-13

ASTM A193 B7 Grade Alloy Steel Button Head Cap Screw UNC Zinc Plated ASME B18.6.3

$0.00
ASTM A193 B7 Grade Alloy Steel Button Head Cap Screw UNC Zinc Plated ASME B18.6.3 Material: Alloy Steel Grade / Class: ASTM A193 B7 Standards: ASME B18.6.3, ASTM A193 Thread...
Quick view Read more
Button Head Socket Cap Screw — Button Head Socket Cap Screw 40CrMo UNC 5/16-18 3/8-16 1/2-13 Zinc Plated ASME B18.6.3
5/16-183/8-161/2-13

Button Head Socket Cap Screw 40CrMo UNC Zinc Plated ASME B18.6.3

$0.00
Button Head Socket Cap Screw 40CrMo UNC Zinc Plated ASME B18.6.3 Material: 40CrMo Alloy Steel Standards: ASME B18.6.3 Thread Series: UNC Finish / Coating: Zinc Plated
Quick view Read more
Button Head Socket Cap Screw — Alloy Steel 40CrMo Black Oxide Button Head Socket Cap Screw UNC #2-56 #4-40 #6-32 #8-32 35CrMo ASME B18.3
#2-56#4-40#6-32#8-32

Alloy Steel 40CrMo Black Oxide Button Head Socket Cap Screw UNC 35CrMo ASME B18.3

$0.00
Alloy Steel 40CrMo Black Oxide Button Head Socket Cap Screw UNC 35CrMo ASME B18.3 Material: 40CrMo Alloy Steel Grade / Class: Grade 10.9 Standards: ASME B18.3 Thread Series: UNC Finish...
Quick view Read more
Button Head Socket Cap Screw — Hex Socket Button Head Cap Screw Alloy Steel 35CrMo UNF 5/16-24 3/8-24 1/2-20 Zinc Plated ASME
5/16-243/8-241/2-20

Hex Socket Button Head Cap Screw Alloy Steel 35CrMo UNF Zinc Plated ASME

$0.00
Hex Socket Button Head Cap Screw Alloy Steel 35CrMo UNF Zinc Plated ASME Material: 35CrMo Alloy Steel Thread Series: UNF Finish / Coating: Zinc Plated
Quick view Read more
Button Head Socket Cap Screw — Dacromet Coated Button Head Socket Cap Screw Alloy Steel 35CrMo UNC #2-56 #4-40 #6-32 #8-32 #10-24 1/4-20 ASME B18.3
#2-56#4-40#6-32#8-32#10-241/4-20

Dacromet Coated Button Head Socket Cap Screw Alloy Steel 35CrMo UNC ASME B18.3

$0.00
Dacromet Coated Button Head Socket Cap Screw Alloy Steel 35CrMo UNC ASME B18.3 Material: 35CrMo Alloy Steel Standards: ASME B18.3 Thread Series: UNC Finish / Coating: Dacromet
Quick view Read more
Button Head Socket Cap Screw — 304 Stainless Steel Button Head Socket Cap Screw UNC #2-56 #4-40 #6-32 #8-32 #10-24 1/4-20 5/16-18 3/8 1/2-13 A2-70 ASME B18.3
#2-56#4-40#6-32#8-32#10-241/4-205/16-183/81/2-13

304 Stainless Steel Button Head Socket Cap Screw UNC A2-70 ASME B18.3

$0.00
304 Stainless Steel Button Head Socket Cap Screw UNC A2-70 ASME B18.3 Material: 304 Stainless Steel Grade / Class: A2-70 Standards: ASME B18.3 Thread Series: UNC Finish / Coating: Plain...
Quick view Read more
You've viewed 24 of 27 products
Load More

Buying Guide

Common Questions

What information do you need to quote this series?

Share the standard, thread size, length, material, grade, finish and quantity. For non-standard parts, a drawing or sample helps us confirm production details faster.

Can you make sizes or materials not listed here?

Yes. We manufacture to drawing and to sample. Send your specification through the RFQ form and we will confirm feasibility, MOQ and lead time.

What inspection and material documents can you provide?

Material test certificates, dimensional inspection reports and coating reports are available on request, depending on the material and finish of your order.

What is the MOQ, and can I get samples first?

MOQ depends on size, material and finish — standard catalog sizes start lower, and custom parts are quoted per drawing. Samples are available for most standard items; mention sampling when you send the RFQ and we will confirm.

How long does production and delivery take?

Lead time is confirmed per order with your quotation. Coated and custom parts need additional production and surface-treatment time. Share your target delivery date in the RFQ and we will confirm whether we can meet it before you commit.

Can't find the exact spec?

We manufacture standard and custom fasteners to order. Tell us the size, material, grade, finish and quantity — or send your drawing — and we will confirm MOQ and lead time.

Request a Quote