St. Louis Screw & Bolt

What St. Louis Screw & Bolt does

St. Louis Screw & Bolt, operating as SLSB, LLC, is a privately held US manufacturer and distributor of structural fasteners headquartered in Madison, Illinois. Founded in 1887, the company claims to be one of the longest continuously operating bolt manufacturers in the United States. Its product portfolio centers on heavy hex structural bolts (grades A325 and A490) in multiple finishes (hot dip galvanized, mechanically galvanized, weathering, plain), tension control bolts conforming to ASTM F2280/A490 and F1852/A325, low carbon A307 bolts, lag and carriage bolts, countersunk bolts, direct tension indicators (DTIs), washers, nuts, all-thread rod, and concrete and foundation anchors. A custom manufacturing line produces anchor bolts, tie rod assemblies, U-bolts, eye bolts, and J-bolts in diameters from 1/2" through 4" and up to 40 feet in length, and the company operates an online mill traceability and certification program along with daily rotational capacity testing. Distribution runs through three warehouse sites — Madison IL (corporate HQ), Las Vegas NV, and Atlanta GA — supporting Midwest, Southwest, and Southeast coverage.

The company sells exclusively through direct channels: phone (800-237-7059), email ([email protected]), and live chat manned by real personnel during business hours, with quote-based B2B pricing and an available credit account for approved buyers. Its customer base is concentrated in the construction vertical — steel fabricators, bridge builders, and general contractors needing certified structural fasteners for steel construction, bridge, and infrastructure projects — and it maintains active memberships in AISC, NSBA, IFI, NFDA, SEAA, AGC, and adherence to ASTM and RCSC standards. Revenue is not publicly disclosed; the company is independently owned with no disclosed institutional backing, leadership changes, M&A, or funding events in the available material.

Name

St. Louis Screw & Bolt

Legal name

SLSB, LLC

Website

https://slbolt.com

Company type

Private

Founded year

1800

Operating status

Operating

Headcount range

11–50 employees

Short description

St. Louis Screw & Bolt (SLSB, LLC) is a US manufacturer and distributor of structural fasteners — heavy hex bolts, tension control bolts, anchors, and related hardware — serving steel fabricators, bridge builders, and construction contractors via three US warehouses.

Ownership category

akta.pro rank

Product category

Structural Fasteners

NAICS

Bolt, Nut, Screw, Rivet, and Washer Manufacturing (332722)

SIC

Bolts, Nuts, Screws, Rivets & Washers (3452)

akta.pro primary industry

Fasteners, Anchors & Connectors (Bolts, Weld Studs, Plates) (IMADACAJ)

Keywords

• Structural fasteners
• Hex head bolts
• Tension control bolts
• Anchor bolts
• Construction fasteners

Headquarters

HQ city

Madison

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Infrastructure, Marketing or Sales

Revenue model

1. Structural Fastener Sales: Sale of manufactured and distributed structural fasteners including heavy hex bolts, tension control bolts, anchor bolts, washers, nuts, and all thread. Products sold in various grades (A325, A490) and finishes (Hot Dip Galvanized, Mechanically Galvanized, Weathering, Plain).

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

St. Louis Screw & Bolt manufactures and distributes structural fasteners for the construction industry, specializing in hex head bolts (A325 and A490 grades) and tension control bolts in multiple finishes including hot dip galvanized, mechanically galvanized, weathering, and plain. The company also produces complementary products (washers, nuts, DTIs, all-thread, concrete and foundation anchors) and offers custom manufacturing of anchor bolts, tie rod assemblies, U-bolts, eye bolts, and J-bolts in diameters from 1/2" through 4" and lengths up to 40 feet.

Product overview

St. Louis Screw & Bolt is a USA-based manufacturer and distributor of structural fasteners. The company specializes in HEX HEAD BOLTS in A325 & A490 type I, III Hot Dip Galvanized, Mechanically Galvanized, Weathering and Plain Finish. Their core product portfolio includes Heavy Hex Structural Bolts, Tension Control Bolts, Low Carbon Bolts (A307), Lag & Carriage Bolts, Countersunk Bolts, DTIs, Washers, Nuts, All Thread, and Anchor Bolts (Concrete Anchors and Foundation Anchors). The company offers both standard stocked items in various sizes and custom manufacturing capabilities for Anchor Bolts, Tie Rod Assemblies, U-Bolts, Eye Bolts, and J-Bolts in diameters from 1/2" through 4" and up to 40 feet in length. They also provide Wrenches for TC and Hex Bolts. SLSB stocks what they claim to be among the nation's largest inventory of TC bolts (tension shear) and performs rotational capacity testing on hundreds of bolts daily.

Differentiator

Problem solved

Functional benefit

Products and services

• Heavy Hex Structural Bolts Structural bolts available in A325 and A490 grades (Type 1, Type 3), mechanically galvanized and hot dip galvanized finishes, ranging from 1/2" to 4" diameter with custom manufacturing capabilities. Sold to construction and steel fabrication buyers.
• Tension Control Bolts (TC Bolts) TC bolts (tension shear) meeting ASTM F2280/A490 and ASTM F1852/A325 specifications for construction bolting applications. Stocked as one of the nation's largest inventories per company claim.
• Low Carbon Bolts (A307) Low carbon structural bolts meeting A307 specifications for general fastening applications.
• Lag & Carriage Bolts Lag and carriage bolts for wood and general construction fastening.
• Countersunk Bolts Countersunk bolts for flush-fit fastening applications.
• Direct Tension Indicators (DTIs) Direct Tension Indicators used to verify proper bolt tension during installation.
• Washers Structural washers for use with bolts in construction and fastening applications.
• Nuts Nuts for structural bolting applications, complementing the company's bolt product lines.
• All Thread Threaded rod products for various fastening and construction applications.
• Concrete Anchors Anchors designed for concrete fastening applications.
• Foundation Anchors Anchors designed for foundation and structural mounting applications, available in custom manufacturing.
• Custom Anchor Bolts and Tie Rod Assemblies Custom manufactured Anchor Bolts, Tie Rod Assemblies, U-Bolts, Eye Bolts, and J-Bolts in diameters from 1/2" through 4" and up to 40 feet in length, built to customer specifications.
• Wrenches for TC and Hex Bolts Wrenches for tension control and hex bolts, sold and serviced by the company.

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• AISC (American Institute for Steel Construction)coreOthersActive membership in AISC demonstrates commitment to the steel construction industry and provides networking and industry standard alignment opportunities.
• NSBA (National Steel Bridge Alliance)coreOthersActive membership supporting the steel bridge construction industry and related standards development.
• IFI (Industrial Fastener Institute)coreOthersMember of the Industrial Fastener Institute, the primary industry association for fastener manufacturers.
• NFDA (National Fastener Distributors Association)coreOthersMember of the National Fastener Distributors Association representing fastener distribution industry.
• SEAA (Steel Erectors Association of America)minorOthersActive membership in steel erection industry association.
• AGC (Associated General Contractors of America)minorOthersMembership in the construction industry's primary trade association.
• ASTM (American Society for Testing and Materials)coreOthersAdherence to ASTM standards for structural bolts including ASTM F3125, F2280, F1852.
• RCSC (Research Council on Structural Connections)coreOthersCompliance with RCSC standards for structural bolting specifications.

Scale indicators3 records

Recent moves5 records

Expansion highlights3 records

Direct peers

• Portland Bolt & Manufacturing Company: A US structural bolt manufacturer specializing in A325/A490 hex bolts, anchor bolts, and tie rods — directly overlapping SLSB's core product portfolio and target customer base of steel fabricators and bridge builders.
• LeJeune Bolt Company: A US manufacturer of heavy hex structural bolts, anchor bolts, and custom fasteners with similar size, product mix, and customer base to SLSB — focused on A325/A490 and related structural grades.
• Birmingham Fastener Manufacturing: US-based structural fastener manufacturer offering hex bolts, TC bolts, anchor bolts, and allied products — directly comparable in product breadth, customer segments, and distribution approach.
• Haydon Bolts: A long-established US manufacturer of structural bolts, anchor bolts, and construction fasteners with comparable product categories and customer profile to St. Louis Screw & Bolt.
• Lake Erie Bolt & Nut Company: A US manufacturer and distributor of structural bolts, nuts, and fasteners serving construction and industrial customers — direct overlap in product categories (A325/A490 hex bolts, anchor bolts) and customer base.

Broad incumbents

• Nucor Corporation: The largest US steel producer operates a fastener division producing structural bolts among a much broader steel and steel-products portfolio. Comparable because it serves the same end markets with overlapping structural fastener products, but at far greater scale and with vertical integration in steelmaking.
• Fastenal Company: A large US industrial fastener distributor and manufacturer serving construction and industrial customers nationwide. Overlaps with SLSB in structural fastener SKUs and customer segments, but with a vastly broader catalog and scale.

Regional players

• Lindapter International: A UK-based manufacturer of structural steel connections and fastener products sold globally, including into the US. Comparable in serving structural steelwork customers, but operates primarily from outside SLSB's domestic market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/slbolts
• Facebookfacebook.com/pages/urlhere
• LinkedInlinkedin.com/urlhere

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about St. Louis Screw & Bolt