Screws · ASME B18.3 · Application guide

What Are Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point) Used For?

Typical applications, the industries that specify socket set screws, unc (flat, cone, dog and cup point), and how to choose the right size, material and finish for the joint.

Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point) are used for inch hex socket set screws with UNC thread in flat, cone, dog and cup point styles. They are manufactured to ASME B18.3, and the choice of size, property class and finish is driven by the load in the joint and the environment it sits in.

Primary duty: Inch hex socket set screws with UNC thread in flat, cone, dog and cup point styles
Governing standard: ASME B18.3
Screw size range: 1 3/4" to #10
Category: Screws

Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation.

Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point) are selected when an assembly calls for inch hex socket set screws with UNC thread in flat, cone, dog and cup point styles. This application guide to the ASME B18.3 type covers concrete end-uses, the specification checklist, correct installation, and where an alternative fastener performs better. Stocked across roughly 1 to 10, they cover general to heavy-duty work.

Typical Applications for Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point)

The most common settings where these are specified:

Power transmission: inch shafts.
Machinery: collars.
Automation: inch equipment.
Maintenance: US equipment repair.

How to Specify Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point) for Your Application

Size: Match the nominal size to the mating thread or hole. This product spans 1–10; check the full table below for the exact dimensions of each size.
Drive & head: Pick the drive (socket, cross, slot) and head style for the tool access and seating surface; a recessed drive resists cam-out under power tools.
Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
Standard: This product is supplied to ASME B18.3. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

Installation & Assembly Practice

Set screws are rated to ISO 898-5 by hardness, because they work in compression against a shaft rather than in tension. ISO 898-1 excludes them, and a set screw has no head to preload against, so neither a property class nor a preload torque applies. Seating torque depends on the point form and the shaft material.
Match the driver exactly to the recess (PH ≠ PZ; hex key sizes per ISO 2936) and keep the tool axial — side load is the main cause of stripped drives.
In tapped holes, engage a thread length of at least 1× the nominal diameter in steel, 2× in aluminum.
Set power tools to a torque that seats the head without embedding it into the mating surface.

Common Selection Mistakes with Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point)

Under-sizing the drive for the installation torque — a small recess at high torque strips before the screw is seated.
Using a countersunk head in thin sheet where the countersink removes most of the load-bearing material.
Specifying stainless in high-strength duty: A2-70 is roughly class 7 steel, not a 10.9 substitute.

Where Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point) Are Not the Right Choice

Not for high-preload structural joints (use a property-class bolt and nut), and not in thin sheet where a self-drilling or self-tapping type suits better.

Custom manufacturing · Made to drawing

Need a socket set screws, UNC (flat, cone, dog and cup point) outside the standard range?

Head form and drive can be specified to the assembly rather than to a standard: a larger bearing face, a security drive, or a socket sized for the tool already on the bench. Made by cold heading or warm forging.

Minimum order from 2,000 pieces; samples within 7 days of drawing approval.

Custom screw manufacturing Send a drawing

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Dimensioned line drawing of #0 Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point) to ASME B18.3. Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

Type: Hexagon socket set screws with flat point
Pitch P (mm): 0.318
t (mm): 1.27
dp (mm): 0.762
dt (mm): 0.305
df (mm): 0.978
Hex socket s (mm): 0.711
z (mm): 0.381
Length range l (in): 1/16"~1 1/2"

Sends the selected values to the quote form below.

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The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.

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Specification

Item / category Standard Size(s) Material / finish Quantity

Business Information

Company * Contact Name * Email * Phone (with country code) Country / Region

Notes

Dimensions & Specifications (ASME B18.3)

Size	Type	Pitch P (mm)	t (mm)	dp (mm)	dt (mm)	df (mm)	Hex socket s (mm)	z (mm)	Length range l (in)	Reference standard
#0	Hexagon socket set screws with flat point	0.318	1.27	0.762	0.305	0.978	0.711	0.381	1/16"~1 1/2"	ASME B18.3
#0	Hexagon socket set screws with cone point	0.318	1.27	0.762	0.305	0.978	0.711	0.381	1/16"~1 1/2"	ASME B18.3
#0	Hexagon socket set screws with dog point	0.318	1.27	0.762	0.305	0.978	0.711	0.381	1/16"~1 1/2"	ASME B18.3
#0	Hexagon socket set screws with cup point	0.318	1.27	0.762	0.305	0.978	0.711	0.381	1/16"~1 1/2"	ASME B18.3
#1	Hexagon socket set screws with flat point	0.397	1.524	0.927	0.371	1.194	0.889	0.483	1/16"~1 1/2"	ASME B18.3
#1	Hexagon socket set screws with cone point	0.397	1.524	0.927	0.371	1.194	0.889	0.483	1/16"~1 1/2"	ASME B18.3
#1	Hexagon socket set screws with dog point	0.397	1.524	0.927	0.371	1.194	0.889	0.483	1/16"~1 1/2"	ASME B18.3
#1	Hexagon socket set screws with cup point	0.397	1.524	0.927	0.371	1.194	0.889	0.483	1/16"~1 1/2"	ASME B18.3
#2	Hexagon socket set screws with flat point	0.454	1.524	1.092	0.437	1.397	0.889	0.559	1/16"~2 1/2"	ASME B18.3
#2	Hexagon socket set screws with cone point	0.454	1.524	1.092	0.437	1.397	0.889	0.559	1/16"~2 1/2"	ASME B18.3
#2	Hexagon socket set screws with dog point	0.454	1.524	1.092	0.437	1.397	0.889	0.559	1/16"~2 1/2"	ASME B18.3
#2	Hexagon socket set screws with cup point	0.454	1.524	1.092	0.437	1.397	0.889	0.559	1/16"~2 1/2"	ASME B18.3
#3	Hexagon socket set screws with flat point	0.529	1.778	1.257	0.503	1.626	1.27	0.635	1/8"~2 1/2"	ASME B18.3
#3	Hexagon socket set screws with cone point	0.529	1.778	1.257	0.503	1.626	1.27	0.635	1/8"~2 1/2"	ASME B18.3
#3	Hexagon socket set screws with dog point	0.529	1.778	1.257	0.503	1.626	1.27	0.635	1/8"~2 1/2"	ASME B18.3
#3	Hexagon socket set screws with cup point	0.529	1.778	1.257	0.503	1.626	1.27	0.635	1/8"~2 1/2"	ASME B18.3
#4	Hexagon socket set screws with flat point	0.635	1.778	1.422	0.569	1.841	1.27	0.711	1/8"~4"	ASME B18.3
#4	Hexagon socket set screws with cone point	0.635	1.778	1.422	0.569	1.841	1.27	0.711	1/8"~4"	ASME B18.3
#4	Hexagon socket set screws with dog point	0.635	1.778	1.422	0.569	1.841	1.27	0.711	1/8"~4"	ASME B18.3
#4	Hexagon socket set screws with cup point	0.635	1.778	1.422	0.569	1.841	1.27	0.711	1/8"~4"	ASME B18.3
#5	Hexagon socket set screws with flat point	0.635	2.032	1.575	0.635	2.045	1.575	0.762	3/16"~4"	ASME B18.3
#5	Hexagon socket set screws with cone point	0.635	2.032	1.575	0.635	2.045	1.575	0.762	3/16"~4"	ASME B18.3
#5	Hexagon socket set screws with dog point	0.635	2.032	1.575	0.635	2.045	1.575	0.762	3/16"~4"	ASME B18.3
#5	Hexagon socket set screws with cup point	0.635	2.032	1.575	0.635	2.045	1.575	0.762	3/16"~4"	ASME B18.3
#6	Hexagon socket set screws with flat point	0.794	2.032	1.753	0.701	2.273	1.575	0.889	1/8"~4"	ASME B18.3
#6	Hexagon socket set screws with cone point	0.794	2.032	1.753	0.701	2.273	1.575	0.889	1/8"~4"	ASME B18.3
#6	Hexagon socket set screws with dog point	0.794	2.032	1.753	0.701	2.273	1.575	0.889	1/8"~4"	ASME B18.3
#6	Hexagon socket set screws with cup point	0.794	2.032	1.753	0.701	2.273	1.575	0.889	1/8"~4"	ASME B18.3
#8	Hexagon socket set screws with flat point	0.794	2.286	2.07	0.833	2.692	1.981	1.016	1/8"~5"	ASME B18.3
#8	Hexagon socket set screws with cone point	0.794	2.286	2.07	0.833	2.692	1.981	1.016	1/8"~5"	ASME B18.3
#8	Hexagon socket set screws with dog point	0.794	2.286	2.07	0.833	2.692	1.981	1.016	1/8"~5"	ASME B18.3
#8	Hexagon socket set screws with cup point	0.794	2.286	2.07	0.833	2.692	1.981	1.016	1/8"~5"	ASME B18.3
#10	Hexagon socket set screws with flat point	1.058	2.54	2.413	0.965	3.137	2.388	1.143	3/16"~8"	ASME B18.3
#10	Hexagon socket set screws with cone point	1.058	2.54	2.413	0.965	3.137	2.388	1.143	3/16"~8"	ASME B18.3
#10	Hexagon socket set screws with dog point	1.058	2.54	2.413	0.965	3.137	2.388	1.143	3/16"~8"	ASME B18.3
#10	Hexagon socket set screws with cup point	1.058	2.54	2.413	0.965	3.137	2.388	1.143	3/16"~8"	ASME B18.3
1/4"	Hexagon socket set screws with flat point	1.27	3.175	3.175	1.27	3.873	3.175	1.6	3/8"~10"	ASME B18.3
1/4"	Hexagon socket set screws with cone point	1.27	3.175	3.175	1.27	3.873	3.175	1.6	3/8"~10"	ASME B18.3
1/4"	Hexagon socket set screws with dog point	1.27	3.175	3.175	1.27	3.873	3.175	1.6	3/8"~10"	ASME B18.3
1/4"	Hexagon socket set screws with cup point	1.27	3.175	3.175	1.27	3.873	3.175	1.6	3/8"~10"	ASME B18.3
5/16"	Hexagon socket set screws with flat point	1.411	3.962	4.166	1.587	5.055	3.962	1.981	1/2"~10"	ASME B18.3
5/16"	Hexagon socket set screws with cone point	1.411	3.962	4.166	1.587	5.055	3.962	1.981	1/2"~10"	ASME B18.3
5/16"	Hexagon socket set screws with dog point	1.411	3.962	4.166	1.587	5.055	3.962	1.981	1/2"~10"	ASME B18.3
5/16"	Hexagon socket set screws with cup point	1.411	3.962	4.166	1.587	5.055	3.962	1.981	1/2"~10"	ASME B18.3
3/8"	Hexagon socket set screws with flat point	1.587	4.775	5.156	1.905	6.236	4.775	2.388	1/2"~12"	ASME B18.3
3/8"	Hexagon socket set screws with cone point	1.587	4.775	5.156	1.905	6.236	4.775	2.388	1/2"~12"	ASME B18.3
3/8"	Hexagon socket set screws with dog point	1.587	4.775	5.156	1.905	6.236	4.775	2.388	1/2"~12"	ASME B18.3
3/8"	Hexagon socket set screws with cup point	1.587	4.775	5.156	1.905	6.236	4.775	2.388	1/2"~12"	ASME B18.3
7/16"	Hexagon socket set screws with flat point	1.814	5.563	6.147	2.223	7.417	5.563	2.769	3/4"~12"	ASME B18.3
7/16"	Hexagon socket set screws with cone point	1.814	5.563	6.147	2.223	7.417	5.563	2.769	3/4"~12"	ASME B18.3
7/16"	Hexagon socket set screws with dog point	1.814	5.563	6.147	2.223	7.417	5.563	2.769	3/4"~12"	ASME B18.3
7/16"	Hexagon socket set screws with cup point	1.814	5.563	6.147	2.223	7.417	5.563	2.769	3/4"~12"	ASME B18.3
1/2"	Hexagon socket set screws with flat point	1.954	6.35	7.125	2.54	8.611	6.35	3.175	3/4"~12"	ASME B18.3
1/2"	Hexagon socket set screws with cone point	1.954	6.35	7.125	2.54	8.611	6.35	3.175	3/4"~12"	ASME B18.3
1/2"	Hexagon socket set screws with dog point	1.954	6.35	7.125	2.54	8.611	6.35	3.175	3/4"~12"	ASME B18.3
1/2"	Hexagon socket set screws with cup point	1.954	6.35	7.125	2.54	8.611	6.35	3.175	3/4"~12"	ASME B18.3
5/8"	Hexagon socket set screws with flat point	2.309	7.925	9.119	3.175	11.748	7.925	3.962	3/4"~14"	ASME B18.3
5/8"	Hexagon socket set screws with cone point	2.309	7.925	9.119	3.175	11.748	7.925	3.962	3/4"~14"	ASME B18.3
5/8"	Hexagon socket set screws with dog point	2.309	7.925	9.119	3.175	11.748	7.925	3.962	3/4"~14"	ASME B18.3
5/8"	Hexagon socket set screws with cup point	2.309	7.925	9.119	3.175	11.748	7.925	3.962	3/4"~14"	ASME B18.3
3/4"	Hexagon socket set screws with flat point	2.54	9.525	11.113	3.81	14.11	9.525	4.775	1"~14"	ASME B18.3
3/4"	Hexagon socket set screws with cone point	2.54	9.525	11.113	3.81	14.11	9.525	4.775	1"~14"	ASME B18.3
3/4"	Hexagon socket set screws with dog point	2.54	9.525	11.113	3.81	14.11	9.525	4.775	1"~14"	ASME B18.3
3/4"	Hexagon socket set screws with cup point	2.54	9.525	11.113	3.81	14.11	9.525	4.775	1"~14"	ASME B18.3
7/8"	Hexagon socket set screws with flat point	2.822	12.7	13.106	4.445	16.485	12.7	5.563	1 1/2"~14"	ASME B18.3
7/8"	Hexagon socket set screws with cone point	2.822	12.7	13.106	4.445	16.485	12.7	5.563	1 1/2"~14"	ASME B18.3
7/8"	Hexagon socket set screws with dog point	2.822	12.7	13.106	4.445	16.485	12.7	5.563	1 1/2"~14"	ASME B18.3
7/8"	Hexagon socket set screws with cup point	2.822	12.7	13.106	4.445	16.485	12.7	5.563	1 1/2"~14"	ASME B18.3
1"	Hexagon socket set screws with flat point	3.175	14.275	15.088	5.08	18.847	14.275	6.35	1 1/2"~14"	ASME B18.3
1"	Hexagon socket set screws with cone point	3.175	14.275	15.088	5.08	18.847	14.275	6.35	1 1/2"~14"	ASME B18.3
1"	Hexagon socket set screws with dog point	3.175	14.275	15.088	5.08	18.847	14.275	6.35	1 1/2"~14"	ASME B18.3
1"	Hexagon socket set screws with cup point	3.175	14.275	15.088	5.08	18.847	14.275	6.35	1 1/2"~14"	ASME B18.3
1 1/8"	Hexagon socket set screws with flat point	3.629	14.275	17.069	5.715	21.209	14.275	7.137	1 5/8"~14"	ASME B18.3
1 1/8"	Hexagon socket set screws with cone point	3.629	14.275	17.069	5.715	21.209	14.275	7.137	1 5/8"~14"	ASME B18.3
1 1/8"	Hexagon socket set screws with dog point	3.629	14.275	17.069	5.715	21.209	14.275	7.137	1 5/8"~14"	ASME B18.3
1 1/8"	Hexagon socket set screws with cup point	3.629	14.275	17.069	5.715	21.209	14.275	7.137	1 5/8"~14"	ASME B18.3
1 1/4"	Hexagon socket set screws with flat point	3.629	15.875	19.05	6.35	23.597	15.875	7.95	1 5/8"~14"	ASME B18.3
1 1/4"	Hexagon socket set screws with cone point	3.629	15.875	19.05	6.35	23.597	15.875	7.95	1 5/8"~14"	ASME B18.3
1 1/4"	Hexagon socket set screws with dog point	3.629	15.875	19.05	6.35	23.597	15.875	7.95	1 5/8"~14"	ASME B18.3
1 1/4"	Hexagon socket set screws with cup point	3.629	15.875	19.05	6.35	23.597	15.875	7.95	1 5/8"~14"	ASME B18.3
1 3/8"	Hexagon socket set screws with flat point	4.233	15.875	21.031	6.985	25.933	15.875	8.738	1 3/4"~14"	ASME B18.3
1 3/8"	Hexagon socket set screws with cone point	4.233	15.875	21.031	6.985	25.933	15.875	8.738	1 3/4"~14"	ASME B18.3
1 3/8"	Hexagon socket set screws with dog point	4.233	15.875	21.031	6.985	25.933	15.875	8.738	1 3/4"~14"	ASME B18.3
1 3/8"	Hexagon socket set screws with cup point	4.233	15.875	21.031	6.985	25.933	15.875	8.738	1 3/4"~14"	ASME B18.3
1 1/2"	Hexagon socket set screws with flat point	4.233	19.05	23.012	7.62	28.321	19.05	9.525	1 3/4"~14"	ASME B18.3
1 1/2"	Hexagon socket set screws with cone point	4.233	19.05	23.012	7.62	28.321	19.05	9.525	1 3/4"~14"	ASME B18.3
1 1/2"	Hexagon socket set screws with dog point	4.233	19.05	23.012	7.62	28.321	19.05	9.525	1 3/4"~14"	ASME B18.3
1 1/2"	Hexagon socket set screws with cup point	4.233	19.05	23.012	7.62	28.321	19.05	9.525	1 3/4"~14"	ASME B18.3
1 3/4"	Hexagon socket set screws with flat point	5.08	25.4	26.988	8.89	33.033	25.4	11.125	2"~14"	ASME B18.3
1 3/4"	Hexagon socket set screws with cone point	5.08	25.4	26.988	8.89	33.033	25.4	11.125	2"~14"	ASME B18.3
1 3/4"	Hexagon socket set screws with dog point	5.08	25.4	26.988	8.89	33.033	25.4	11.125	2"~14"	ASME B18.3
1 3/4"	Hexagon socket set screws with cup point	5.08	25.4	26.988	8.89	33.033	25.4	11.125	2"~14"	ASME B18.3
2"	Hexagon socket set screws with flat point	5.644	25.4	30.95	10.16	37.77	25.4	12.7	2 1/2"~14"	ASME B18.3
2"	Hexagon socket set screws with cone point	5.644	25.4	30.95	10.16	37.77	25.4	12.7	2 1/2"~14"	ASME B18.3
2"	Hexagon socket set screws with dog point	5.644	25.4	30.95	10.16	37.77	25.4	12.7	2 1/2"~14"	ASME B18.3
2"	Hexagon socket set screws with cup point	5.644	25.4	30.95	10.16	37.77	25.4	12.7	2 1/2"~14"	ASME B18.3

Inside the plant

Manufactured in our own plant

This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.

01

Cold heading

Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.

Head dimensions and under-head radius checked at set-up and per shift.
02

Thread rolling

Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.

Go / no-go ring gauges to ISO 965 tolerance class 6g.
03

Heat treatment

Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.

Core hardness and tensile tested per lot to ISO 898-1.
04

Surface treatment

Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.

Coating thickness and neutral salt spray hours to ISO 9227.

Frequently Asked Questions

What material should Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point) be for outdoor use?

For damp, coastal or chemical environments specify A4 (316) stainless or a suitably coated steel. For indoor or dry use, A2 (304) stainless or zinc-plated steel is normally adequate.

Are Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point) made to a recognized standard?

Yes — they are manufactured to ASME B18.3, so dimensions are interchangeable between suppliers when you quote the standard on your order.

What are Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point) used for?

Inch hex socket set screws with UNC thread in flat, cone, dog and cup point styles. They are supplied to ASME B18.3.

Which industries use Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point)?

They are commonly specified in power transmission, machinery and automation, among other sectors.

Can I get a quote for Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point) in the size and material I need?

Yes. Use the technical drawing and quote form on this page to set the size and options, then send the exact configuration to our team for pricing and lead time.

Typical Applications for Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point)

How to Specify Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point) for Your Application

Installation & Assembly Practice

Common Selection Mistakes with Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point)

Where Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point) Are Not the Right Choice

Need a socket set screws, UNC (flat, cone, dog and cup point) outside the standard range?

Technical Drawing

Request a Quote

Request a Quotation

Dimensions & Specifications (ASME B18.3)

Manufactured in our own plant

Cold heading

Thread rolling

Heat treatment

Surface treatment

Frequently Asked Questions

Related Pages

Socket Set Screws, UNC (Flat, Cone, Dog and Cup Point) Specification Guides

Related Fastener Applications