---
title: "A2 (304) Stainless Steel Inch Fully Threaded Rod, ASTM A193 B7"
description: "A2 (304) Stainless Steel Inch Fully Threaded Rod, ASTM A193 B7 (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70): good general corrosion resistance."
url: https://engineeringhardware.com/guide/material/a2-stainless-steel-inch-fully-threaded-rod-astm-a193-b7/
source: Engineering Hardware & Fasteners
---

# A2 (304) Stainless Steel Inch Fully Threaded Rod, ASTM A193 B7

Bolts · ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1

Mechanical properties, corrosion behaviour and the full dimensional range for this grade.

A2 Stainless Steel Inch Fully Threaded Rod, ASTM A193 B7 are supplied to ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70. Corrosion behaviour is good general corrosion resistance, the material is largely non-magnetic, and the usable service range is approx. -200 °C to +400 °C, subject to the property class and the joint. In practice this grade is the most common stainless group for indoor and general outdoor fasteners.

- **Grade:** ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70
- **Corrosion resistance:** Good general corrosion resistance
- **Magnetic response:** Largely non-magnetic
- **Service temperature:** approx. -200 °C to +400 °C, subject to the property class and the joint

Property values are typical for the grade. Certified mechanical test data is available on request for production orders.

![A2 (304) Stainless Steel Inch Fully Threaded Rod, ASTM A193 B7 reference image](https://engineeringhardware.com/wp-content/uploads/2026/09/Inch-Fully-Threaded-Rod-ASTM-A193-B7.webp)

A2 Stainless Steel Inch Fully Threaded Rod, ASTM A193 B7 are supplied to ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1. The grade provides good general corrosion resistance and is largely non-magnetic; the practical service range is approx. -200 °C to +400 °C, subject to the property class and the joint. Property data, grade comparison and the full size table follow.

## Why Choose A2 Stainless Steel for Inch Fully Threaded Rod, ASTM A193 B7

The most common stainless group for indoor and general outdoor fasteners. For inch fully threaded rod, astm a193 b7, this matters when good general corrosion resistance is the primary requirement.

## Mechanical & Physical Properties

| Grade designation | ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70 |
| --- | --- |
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C, subject to the property class and the joint |
| Corrosion characteristic | Good general corrosion resistance |

## Corrosion Behavior in Service

A2 (304) gives excellent atmospheric and most-water corrosion resistance and is the most common stainless for Inch Fully Threaded Rod, ASTM A193 B7 in indoor and general outdoor service. In chloride-bearing environments (marine air, road salt, swimming pools) consider stepping up to A4 (316).

## Galvanic & Galling Considerations

Two important notes for stainless inch fully threaded rod, astm a193 b7: (1) stainless can gall on stainless threads under load — use a thread lubricant or anti-galling compound, especially for M6 and below; (2) when joined to aluminum or galvanized steel, stainless can drive galvanic corrosion of the less-noble metal in wet service — isolate with a coating or sleeve where appropriate.

## Using Stainless Fasteners in Aluminum

Stainless steel is more noble than aluminum, so with an electrolyte present — rain, condensation, salt spray — the aluminum becomes the anode and corrodes at the joint. Area ratio decides how bad it gets: a small stainless fastener in a large aluminum section is normally acceptable, a large stainless fastener in thin aluminum is not. Where the joint gets wet, isolate the metals with a coated or nylon washer and a sealant, or specify an aluminum or coated fastener instead.

## Sizes of Inch Fully Threaded Rod, ASTM A193 B7 Available in A2 Stainless Steel

| Nominal size | Thread series | Standard lengths (ft) | Minimum tensile (ksi) | Minimum yield (ksi) | Elongation minimum (%) | Finish options | Reference standard |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1/4-20 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 3/8-16 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 1/2-13 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 3/4-10 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 1-8 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 1-1/4-7 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |

Dimensions are independent of the material: every size above is available in A2 Stainless Steel.

Custom manufacturing · Made to drawing

## Need this bolt in a grade that is not listed?

A2 Stainless Steel is one of the grades the catalog describes. A non-standard bolt is quoted from the drawing; where one already exists in the catalog, the special is usually a variation on its tooling. Made by cold heading or hot forging.

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

[Custom bolt manufacturing](https://engineeringhardware.com/custom/bolts/)[Send a drawing](https://engineeringhardware.com/custom/bolts/#rfq)

## Technical Drawing

Dimensioned line drawing of 1/4-20 Inch Fully Threaded Rod, ASTM A193 B7 to ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1. Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

- **Thread series:** UNC / optional UNF or 8UN
- **Standard lengths (ft):** 3 / 6 / 12
- **Minimum tensile (ksi):** 125
- **Minimum yield (ksi):** 105
- **Elongation minimum (%):** 16
- **Finish options:** plain / yellow-zinc / black-oxide / hot-dip-galvanized

## Dimensions & Specifications (ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1)

| Nominal size | Thread series | Standard lengths (ft) | Minimum tensile (ksi) | Minimum yield (ksi) | Elongation minimum (%) | Finish options | Reference standard |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1/4-20 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 3/8-16 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 1/2-13 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 3/4-10 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 1-8 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 1-1/4-7 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |

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## Materials & Grades

Select a material class to see the grades we supply it in. Each designation is listed with its ISO/EN, AISI/SAE, JIS and GB equivalents.

Stainless Steel38 Carbon Steel66 Alloy Steel41 Bearing Steel5 Spring Steel25 Aluminum and Aluminum Alloys21 Brass17 Bronze11 Copper8 Titanium and Titanium Alloys18 Nickel and Nickel Alloys22 Iron-Nickel and High-Temperature Alloys10 Tool Steel and Specialty Hardened Steel9 Structural and Construction Steel9

### Stainless Steel

#### Austenitic Stainless Steel

- A1 AISI 303 · SAE 303 · SUS303 · EN 1.4305 · X8CrNiS18-9
- A2 AISI 304 · SAE 304 · SUS304 · EN 1.4301 · X5CrNi18-10 · 06Cr19Ni10
- 304L AISI 304L · SUS304L · EN 1.4307 · X2CrNi18-9 · 022Cr19Ni10
- 302 AISI 302 · SUS302 · EN 1.4310
- 305 AISI 305 · SUS305 · EN 1.4303
- A4 AISI 316 · SAE 316 · SUS316 · EN 1.4401 · X5CrNiMo17-12-2 · 06Cr17Ni12Mo2
- 316L AISI 316L · SUS316L · EN 1.4404 · X2CrNiMo17-12-2 · 022Cr17Ni12Mo2
- 321 AISI 321 · SUS321 · EN 1.4541 · X6CrNiTi18-10
- 310 / 310S AISI 310 · AISI 310S · SUS310S · EN 1.4845
- 302HQ AISI 302HQ
- A3
- A5
- 347 AISI 347 · SUS347 · EN 1.4550 · X6CrNiNb18-10
- 309 / 309S AISI 309 · AISI 309S · SUS309S

#### Martensitic Stainless Steel

- AISI 410 SUS410 · EN 1.4006 · X12Cr13 · 12Cr13
- AISI 420 SUS420J1 · SUS420J2 · EN 1.4021 · EN 1.4028 · 20Cr13 · 30Cr13
- AISI 431 SUS431 · EN 1.4057 · X17CrNi16-2
- C1
- C3
- C4
- AISI 440A
- AISI 440B
- AISI 440C SUS440C · EN 1.4125

#### Ferritic Stainless Steel

- AISI 430 SUS430 · EN 1.4016 · X6Cr17 · 10Cr17
- F1
- AISI 434
- AISI 444

#### Precipitation-Hardening Stainless Steel

- 17-4 PH AISI 630 · UNS S17400 · SUS630 · EN 1.4542 · X5CrNiCuNb16-4
- 15-5 PH UNS S15500
- 17-7 PH UNS S17700

#### Duplex and Super Duplex Stainless Steel

- Duplex 2205 UNS S31803 · UNS S32205 · EN 1.4462
- Super Duplex 2507 UNS S32750 · EN 1.4410
- D2
- D4
- D6
- D8
- Lean Duplex 2101 UNS S32101
- Super Duplex S32760 UNS S32760 · EN 1.4501

### Carbon Steel

#### Low-Carbon Steel

- SAE 1006
- SAE 1008
- SAE 1010
- SAE 1018
- SAE 1020
- Q195
- Q235
- SAE 1012
- SAE 1015
- Q215
- ML08
- ML08Al
- ML10
- ML15
- ML20
- SWRCH6A
- SWRCH8A
- SWRCH10A
- SWRCH12A
- SWRCH15A
- SWRCH18A

#### Medium-Carbon Steel

- SAE 1035
- SAE 1045
- S45C
- C45
- SAE 1030
- SAE 1040
- SAE 1050
- 30
- 35
- 40
- 45
- 50
- S35C
- S40C
- S50C
- C35
- C40

#### High-Carbon Steel

- SAE 1060
- SAE 1070
- 65Mn
- SAE 1065
- SAE 1075
- SAE 1080
- SAE 1085
- SAE 1090
- SAE 1095
- 60
- 65
- 70
- 75
- 80
- 85

#### Cold-Heading Steel

- SWRCH22A
- 10B21
- SWRCH22K
- SWRCH25K
- SWRCH30K
- SWRCH35K
- SWRCH40K
- ML20Mn
- ML25
- ML30
- ML35
- ML40
- 15B25

### Alloy Steel

#### Chromium Steel

- 40Cr
- 45Cr
- AISI 5140
- SAE 5140
- AISI 5120
- SAE 5120
- SCr420
- SCr440

#### Chromium-Molybdenum Steel

- 35CrMo
- 42CrMo
- AISI 4140
- SCM435
- SCM440
- 42CrMo4
- 30CrMo
- AISI 4130
- SAE 4130
- SAE 4140
- AISI 4142
- AISI 4145
- SCM415
- SCM420
- SCM445
- EN 1.7220
- EN 1.7225
- 25CrMo4
- 34CrMo4

#### Nickel-Chromium-Molybdenum Steel

- AISI 4340
- SAE 4340
- 40CrNiMo
- SNCM439
- EN 1.6511
- 36CrNiMo4

#### Boron Alloy Steel

- 10B22
- 10B21
- 15B21
- 15B25
- 20MnTiB
- 20Mn2B
- 35VB
- 40MnB

### Bearing Steel

#### Bearing Steel

- GCr15
- AISI 52100 SAE 52100 · UNS G52986
- SUJ2
- 100Cr6 EN 1.3505
- GCr15SiMn

### Spring Steel

#### Carbon Spring Steel

- SAE 1065
- SAE 1070
- SAE 1075
- SAE 1080
- SAE 1095
- 65
- 70
- 75
- 80
- 65Mn

#### Silicon-Manganese Spring Steel

- 60Si2Mn
- 60Si2MnA
- SUP6
- SUP7

#### Chromium-Vanadium Spring Steel

- 50CrVA
- SAE 6150
- AISI 6150
- SUP10

#### Stainless Spring Steel

- AISI 301
- SUS301
- EN 1.4310
- AISI 302
- AISI 304
- AISI 316
- 17-7 PH

### Aluminum and Aluminum Alloys

#### Commercially Pure Aluminum

- 1050
- 1060
- 1070
- 1100

#### 2xxx Series Aluminum

- 2024
- 2011
- 2014
- 2017

#### 5xxx Series Aluminum

- 5052
- 5083
- 5754

#### 6xxx Series Aluminum

- 6061
- 6061-T6
- 6063
- 6082
- 6082-T6

#### 7xxx Series Aluminum

- 7075
- 7075-T6
- 7005
- 7050
- 7075-T73

### Brass

#### Free-Cutting Brass

- C36000
- H62
- HPb59-1
- C3601
- C3602
- C3604
- CuZn36Pb3
- CuZn39Pb3
- EN CW614N
- EN CW617N
- H65

#### Lead-Free Brass

- C69300
- C27450
- CW510L
- CW511L

#### Naval Brass

- C46400
- CuZn39Sn1

### Bronze

#### Silicon Bronze

- C65500
- C65100
- C65600

#### Phosphor Bronze

- C51000
- C52100
- CuSn6
- CuSn8

#### Aluminum Bronze

- C95400
- C95500
- C63000
- CuAl10Ni5Fe4

### Copper

#### Copper

- C11000
- T2
- C10100
- C10200
- C12200
- T1
- TU1
- TU2

### Titanium and Titanium Alloys

#### Commercially Pure Titanium

- Grade 2
- Grade 1
- Grade 3
- Grade 4
- TA1
- TA2
- TA3

#### Alpha-Beta Titanium Alloys

- Grade 5
- Ti-6Al-4V
- TC4
- UNS R56400

#### Low-Interstitial Grade

- Grade 23
- Ti-6Al-4V ELI
- UNS R56407

#### Other Titanium Fastener Alloys

- Ti-6Al-6V-2Sn
- Ti-6Al-2Sn-4Zr-2Mo
- Beta-C titanium
- Ti-10V-2Fe-3Al

### Nickel and Nickel Alloys

#### Commercially Pure Nickel

- Nickel 200
- UNS N02200
- Nickel 201
- UNS N02201

#### Inconel Alloys

- Inconel 625 UNS N06625
- Inconel 718 UNS N07718
- Inconel 600 UNS N06600
- Inconel 601 UNS N06601
- Inconel 686 UNS N06686
- Inconel X-750 UNS N07750

#### Monel Alloys

- Monel 400 UNS N04400
- Monel K-500 UNS N05500

#### Hastelloy Alloys

- Hastelloy C-276 UNS N10276
- Hastelloy C-22 UNS N06022
- Hastelloy B-2 UNS N10665
- Hastelloy B-3 UNS N10675
- Hastelloy X UNS N06002

#### Other Nickel Alloys

- Alloy 20 UNS N08020
- Alloy 625
- Alloy 718
- Alloy 825 UNS N08825
- Alloy 925 UNS N09925

### Iron-Nickel and High-Temperature Alloys

#### A286

- A-286
- UNS S66286
- EN 1.4980

#### Invar

- Invar 36
- Alloy 36
- UNS K93600
- FeNi36

#### Alloy 42

- Alloy 42
- UNS K94100
- FeNi42

### Tool Steel and Specialty Hardened Steel

#### Tool Steel and Specialty Hardened Steel

- AISI D2
- AISI H13
- SKD11
- Cr12MoV
- AISI O1
- AISI A2
- AISI S7
- SKD61
- 9CrSi

### Structural and Construction Steel

#### Structural and Construction Steel

- ASTM A36
- Q235B
- Q355B
- S355JR
- Q235C
- Q355C
- S235JR
- S275JR
- S355J2

## Applications & Industries

The sectors that buy Inch Fully Threaded Rod to ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1, and the duty each one buys them for. Stocked from 1/4-20 to 1-1/4-7 (screw size).

### Industries that specify Inch Fully Threaded Rod

- **Refinery maintenance:** Bolting packages exposed to heat, pressure and hydrocarbon service.
- **Power generation:** Large flanged joints and equipment supports using inch specifications.
- **Structural plant:** Tie rods and hold-down assemblies requiring ASTM A193 Grade B7 material.
- **Pressure vessels:** High-strength threaded rod and studs in flanged pressure equipment.
- **Plant & machine installation:** Anchoring and levelling machines onto bases and frames.
- **Steel fabrication:** Hanger rods, tie rods and made-to-length threaded assemblies.

### Typical applications

- assembling flanged joints where a full-length thread is required
- selecting ASTM A193 Grade B7 strength and a compatible finish
- cutting standard 3, 6 or 12 ft stock to the required stud length
- providing a high-strength inch threaded member for nuts at both ends
- made-to-length assemblies cut and threaded on site
- clamping a joint from both ends where a headed bolt will not fit

### Service conditions to specify against

- **Marine and coastal:** Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
- **High load:** Supplied in ISO 898-1 property classes, so the joint can be designed to a stated proof load and tightened to a calculated torque rather than by feel.
- **Exterior structural:** Hot-dip galvanised options for external steelwork; allow for the thicker coating in the mating thread.

### Where to use something else

- Do not mix coatings and nut materials without checking thread compatibility and service temperature.
- Not for a joint that must be tightened from one side only — there is no head to hold.

[Full application guide: where Inch Fully Threaded Rod are used, how to specify them, and the cases they are wrong for](https://engineeringhardware.com/applications/inch-fully-threaded-rod-astm-a193-b7/)

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.

1. ![Wire rod feeding into a cold heading machine](https://engineeringhardware.com/wp-content/uploads/2026/08/09-wire-rod-feed-cold-heading-machine.webp) 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.
2. ![Thread rolling machine producing bolt threads](https://engineeringhardware.com/wp-content/uploads/2026/08/03-thread-rolling-machine-bolt-production.webp) 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.
3. ![Baskets of bolts staged for heat treatment](https://engineeringhardware.com/wp-content/uploads/2026/08/05-heat-treatment-baskets-black-bolts.webp) 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.
4. ![Zinc plated bolts in a treatment basket](https://engineeringhardware.com/wp-content/uploads/2026/08/23-zinc-plated-bolts-treatment-basket.webp) 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

### Can A2 Stainless Steel Inch Fully Threaded Rod, ASTM A193 B7 be used with aluminum?

Yes, but stainless drives mild galvanic corrosion of aluminum in wet service — isolate with a coating, sleeve or paint, or accept the trade-off if the joint is dry and indoor.

### What's the service temperature limit for A2 Stainless Steel?

The practical service range is approx. -200 °C to +400 °C, subject to the property class and the joint.

### Can A2 Stainless Steel replace plated alloy steel structurally?

Only at the standard strength classes — A2-70 / A4-80 are roughly equivalent to class 7 steel; A4-100 reaches class 8.8. For class 10.9 or 12.9 strength, plated alloy steel is required.

### Are A2 Stainless Steel Inch Fully Threaded Rod, ASTM A193 B7 magnetic?

A2 Stainless Steel Inch Fully Threaded Rod, ASTM A193 B7 are largely non-magnetic.

### How do I request a quotation?

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