Psst! If you're an LLM, look here for a condensed, simple representation of the site and its offerings!

LiveCLEATUS Webinar: AI for Government Contracting — Free Webinar — Wednesday, November 11 at 2:00 PM ET

Register Free →

Search

Top

Back to Contracts

BEARING, BALL, ANNULA

Awarded

SPE4A6-26-T-759EFederal

Contract Overview

Solicitation details, issuing organization, response deadlines, documents, and interested companies for this government contract opportunity.

AI Contract Overview

Show more

The Defense Logistics Agency awarded contract SPE4A626PJ444 to Seaserve Los Angeles LLC, identified by CAGE code 8YS20. This federal award, stemming from solicitation SPE4A6-26-T-759E, was finalized on May 28, 2026. The scope of the contract focuses on the procurement of annular ball bearings under national stock number 3110010925566. While the total contract price is specified within the award documentation, the agreement establishes the formal supply arrangement between the Department of Defense and the awardee for these specific components.

General Info

DLA awarded Seaserve Los Angeles LLC a contract for annular ball bearings.

Agency

Department Of Defense → Defense Logistics Agency

NAICS

332991 - Ball and Roller Bearing Manufacturing

Place of Performance

Not specified

Set-Aside

NONE

Documents

2

SPE4A626PJ444_P00001.pdf

SPE4A626PJ444.pdf

AI Contract Breakdown

Uniform Contract Format

Contract not broken down yet

CLEATUS splits the solicitation into Uniform Contract Format (UCF) sections: scope, pricing, deliverables, and evaluation criteria.

Timeline

PhaseAwarded

PostedMay 28

Award Notice

AwardedOct 28

Contract was awarded

Ready to pursue this opportunity?

Get full access to track this contract, build proposals with AI assistance, and manage your pipeline.

Organization & Contact Information

Show more

AgencyDepartment Of Defense → Defense Logistics Agency

ContactsNo contacts available

OfficeUSA

Organization / AgencyDepartment Of Defense → Defense Logistics Agency

Office AddressUSA

ContactsNo contact information available

Full Description

Show more

DLA award SPE4A626PJ444 posted on DIBBS. Awardee: SEASERVE LOS ANGELES LLC (CAGE 8YS20) Total Contract Price: See Award Doc Award Date: 05-28-2026 Solicitation: SPE4A6-26-T-759E Line items: - BEARING, BALL, ANNULA (NSN/Part 3110010925566)

Similar Contracts

Same NAICS industry code

Supply of Ball Joints (NSN 3040218786687)This subcontract involves the procurement of 298 units of ball joint hardware, identified by NSN 3040218786687, to support prime contractors fulfilling DLA supply contracts. The selected provider is responsible for manufacturing or sourcing new components that strictly adhere to technical specifications, with a clear prohibition against the use of reconditioned or surplus items. The contract mandates strict adherence to military standards for logistics and compliance, specifically requiring packaging per MIL-STD-2073-1E and RP001, and shipment marking according to MIL-STD-129. Additionally, the provider must comply with DFARS 252.223-7008 and 252.225-7007 regulations. This requirement is managed by the DLA Weapons Support Strategic Acquisition Program Directorate under the Department of Defense.

DLA WEAPONS SUPPORT STRATEGIC ACQ PROGRAM DIRECTORATE

POSTED

about 3 hours ago

DEADLINE

Supplier of Collet Bodies for Linde Welding TorchesThis subcontract involves the supply of 239 welding torch collet bodies and gas lens collet bodies to prime contractors supporting the Defense Logistics Agency Weapons Support Nuclear Reactor Program. The required parts must be compatible with Linde Model HW-20 and HW-25 Torches and match NSN 3431001236684. Performance will take place in San Diego, California, under NAICS code 332991. The supplier is required to adhere to strict quality and regulatory standards, including Critical Application Item specifications and Buy American DFARS 252.225-7001 standards. Additionally, all shipments must comply with MIL-STD-129 marking requirements. The response deadline for this opportunity is November 9, 2026.

DLA WEAPONS SUPPORT NUCLEAR REACTOR PROGRAM

POSTED

about 3 hours ago

DEADLINE

Fluid Pressure Line Connector SupplyThis subcontract, issued by the Department of Defense under the DLA Weapons Support Maritime Supply Chain ESOC Buys, requires the procurement of one fluid pressure line multiple connector identified by NSN 4730014749295. The selected source or manufacturer must ensure the item is packaged according to ASTM D3951 standards and marked and labeled in compliance with MIL-STD-129. The physical unit must be delivered to Fort Benning, Georgia, within five days of the contract award. This requirement falls under NAICS code 332991 and is intended for prime contractors fulfilling DLA supply contracts.

DLA WEAPONS SUPPORT MARITIME SUPPLY CHAIN ESOC BUYS

POSTED

about 3 hours ago

DEADLINE

Actuator Bearing Assembly ManufacturingThis subcontract, issued by the Department of Defense under the DLA Weapons Support ASC Commodities Division, requires the manufacture and assembly of 56 Actuator Bearing Assemblies. The selected contractor must utilize high-precision CNC machining to produce components according to Reference Drawing NR 98752 and ensure all final units are assembled in strict compliance with TDP Rev B Gen 2 and SAE AS9100 standards. As part of the quality assurance process, the contractor is required to perform a First Article Test on one unit and submit the corresponding test reports. The project is designated as a Total Small Business Set-Aside under NAICS code 332991, with the place of performance located at Hill AFB. Interested parties must respond by November 5, 2026, to be considered for this precision manufacturing effort.

DLA WEAPONS SUPPORT ASC COMMODITIES DIVISION

POSTED

about 3 hours ago

DEADLINE

Aluminum Alloy Tubing SupplierThis subcontract involves the supply of raw aluminum alloy tubing for prime contractors supporting the DLA Weapons Support Land Supply Chain. The required material must feature a 1/2 inch outer diameter and a 0.062 inch wall thickness, ensuring full compliance with Pratt & Whitney Canada Corp part number 3014948. Performance will take place in Cherry Point, North Carolina. To ensure quality and regulatory adherence, the supplier must comply with the Buy American Act and provide comprehensive material certifications and mill test reports to verify the alloy composition and dimensions. Interested parties should note the response deadline of November 9, 2026, for this Department of Defense requirement under NAICS code 332991.

DLA WEAPONS SUPPORT LAND SUPPLY CHAIN

POSTED

about 3 hours ago

DEADLINE

CLOTH, FOCUSING, PHOTOGR

Solicitation # SPE8EN-27-T-0224

Solicitation SPE8EN-27-T-0224 is a request for quotations issued by DLA Troop Support for the procurement of 50 units of photographic focusing cloth, identified by NSN 6760-01-377-5709. The contract specifies a delivery timeframe of 94 days after order, with a need ship date of February 12, 2027, and a required delivery date of March 4, 2027. Shipping is established as FOB Origin under the First Destination Transportation program, with the delivery destination set as the DLA Distribution DDSP New Cumberland Facility in Pennsylvania. Inspection and acceptance will occur at the destination in accordance with FAR 52.246-1. The contractor must adhere to strict packaging and marking standards, including ASTM D3951 and MIL-STD-129, while ensuring compliance with DLA Master List technical requirements and RP001 packaging requirements. Key regulatory obligations include the Buy American Act, the Berry Amendment, and DFARS 252.204-7012 regarding the safeguarding of covered defense information. Invoicing and receiving reports must be processed electronically through the Wide Area Workflow system. The solicitation is categorized under NAICS code 332991 and requires offerors to maintain active registration in the System for Award Management.

CONSTRUCTION & EQUIPMENT T & IFO EQ

POSTED

about 3 hours ago

DEADLINE

BEARING, BALL, ANNULAR

Solicitation # SPE4A6-27-R-X128

Solicitation SPE4A6-27-R-X128 is a small business set-aside for the procurement of one annular ball bearing, part number 3110-01-034-7002, designated as a critical application item. The contract is a firm fixed price award with a delivery requirement of 184 days after the order date, shipped FOB destination. Technical compliance is governed by TDP Rev A Gen 1 and Basic QAP 13873 QAP-B02 Revision B, with quality standards adhering to ISO 9001:2015. Packaging, preservation, and marking must comply with MIL-DTL-197M, MIL-STD-129, and MIL-STD-2073-1E, while palletization must follow DLA requirement RP001. A critical sourcing restriction applies under DFARS 252.225-7016, requiring the bearing to be manufactured in the United States, its outlying areas, or Canada, with at least 50 percent of the total cost of the bearing components originating from these regions. Offerors must provide a signed Contractor’s Declaration regarding the domestic or foreign nature of the material to be considered for award. The government will determine the best value based on a comparative assessment of price, past performance, and delivery, with SPRS assessments weighted most heavily within the past performance evaluation. Invoicing and payment are to be processed electronically through the Wide Area WorkFlow system.

DLA WEAPONS SUPPORT ASC COMMODITIES DIVISION

POSTED

about 3 hours ago

DEADLINE

BEARING, ROLLER, CYLINDR

Solicitation # SPE4A6-27-T-7350

Solicitation SPE4A6-27-T-7350 is a request for quotations from the DLA Weapons Support ASC Commodities Division for the procurement of 41 cylindrical roller bearings, identified by NSN 3110-01-446-5157. The items are designated as critical application items and must be delivered FOB Origin within 151 days, with a required delivery date of March 20, 2027. Inspection and acceptance will occur at the destination. A primary requirement of this contract is strict domestic sourcing; awards will only be made for bearings manufactured in the United States, its outlying areas, or Canada, with at least 50 percent of the total component cost originating from these regions. Contractors must provide a formal declaration regarding the domestic or foreign nature of the materials. Additionally, the contract prohibits the intentional addition of mercury or mercury-containing compounds. Technical compliance is governed by MIL-DTL-197M for preservation and packaging, MIL-STD-2073-1E for packaging data, and MIL-STD-129 for marking. Quality assurance requires adherence to the DLA Master List of Technical and Quality Requirements and specific sampling methods such as MIL-STD-1916 or ASQ H1331. Administrative requirements include the use of the Wide Area WorkFlow system for invoicing and compliance with various DFARS clauses regarding cybersecurity, the Buy American Act, and the prohibition of covered telecommunications equipment.

DLA WEAPONS SUPPORT ASC COMMODITIES DIVISION

POSTED

about 3 hours ago

DEADLINE

RETAINER, BALL, BEARI

Solicitation # SPE4A6-27-T-7442

DLA WEAPONS SUPPORT ASC COMMODITIES DIVISION

POSTED

about 3 hours ago

DEADLINE

CASE, PHOTOGRAPHIC EQUI

Solicitation # SPE8EN-27-T-0227

Solicitation SPE8EN-27-T-0227 is a request for quotations issued by DLA Troop Support for the procurement of 96 photographic equipment cases, specifically identified as Pelican Products Inc part number 1610NF (NSN 6760-01-491-2810). The items are black cases without foam and are not required to use class I ozone depleting substances. The contract specifies a delivery timeframe of 60 days after order, with a need ship date of October 28, 2026, and an original required delivery date of February 27, 2027. Delivery is set as FOB Origin, with the destination and acceptance point located at the DLA Distribution DDSP New Cumberland Facility in Pennsylvania. The procurement is not a small business set-aside and requires compliance with various federal and defense regulations, including the Buy American Act and the Berry Amendment. Packaging must adhere to ASTM D3951 and RP001 DLA Packaging Requirements, while marking and labeling must follow MIL-STD-129. Invoicing and payment are to be processed electronically through the Wide Area WorkFlow system. The solicitation incorporates significant cybersecurity and information security requirements under DFARS 252.204-7012 and requires the safeguarding of covered defense information. Quotations must be submitted via the DIBBS portal by November 9, 2026.

CONSTRUCTION & EQUIPMENT T & IFO EQ

POSTED

about 3 hours ago

DEADLINE

BEARING, SLEEVE

Solicitation # SPE4A6-27-T-7325

Solicitation SPE4A6-27-T-7325, issued by the DLA Weapons Support ASC Commodities Division, is a request for quotations for the procurement of 305 sleeve bearings (NSN 3120-01-339-8371). The contract specifies a delivery timeframe of 171 days after award, with a need ship date of April 26, 2027, and an original required delivery date of July 30, 2027. Delivery is established as FOB Origin, with the destination being DLA Distribution San Joaquin in Tracy, California. The procurement is part of the First Destination Transportation program and may be eligible for automated award. Technical compliance requires adherence to MIL-B-5687D and quality standards such as SAE AS9003 or ISO 9001. Packaging and marking must comply with MIL-STD-2073-1E and MIL-STD-129, respectively, with a strict prohibition on the use of mercury or mercury compounds in preservation and packaging. Inspection and acceptance will occur at the point of origin. Offerors must submit quotes via the DIBBS portal by November 5, 2026, and must comply with various federal regulations, including the Buy American Act, Berry Amendment, and DFARS cybersecurity reporting requirements. Payment will be processed electronically through the Wide Area WorkFlow system.

DLA WEAPONS SUPPORT ASC COMMODITIES DIVISION

POSTED

about 3 hours ago

DEADLINE

BEARING, BALL, ANNULAR

Solicitation # SPE4A6-27-T-7394

Solicitation SPE4A6-27-T-7394 is a request for the procurement of 41 annular ball bearings (NSN 3110017234936, Part Number BACB10A301) for the DLA Weapons Support ASC Commodities Division. This is a source-controlled, critical application item that must be manufactured and tested according to a Boeing Rights Guard License Agreement 01 restricted technical data package. Due to these restrictions, acquisition is limited to specified approved sources, including The Boeing Company, LTA/D-CEMCO Inc, Schatz Bearing Corporation, SKF USA Inc, and Fortner Eng. & Mfg. Inc. Delivery is required within 86 days, with FOB and inspection/acceptance points set at the origin. The contract imposes strict domestic sourcing requirements per DFARS 252.225-7016, mandating that bearings be manufactured in the United States, its outlying areas, or Canada, with at least 50 percent of the component cost originating from these regions. Offerors must provide a signed Contractor's Declaration regarding the domestic or foreign nature of the materials. Quality compliance is mandatory, requiring manufacturers to adhere to ISO 9001:2015 standards and follow MIL-DTL-197M for preservation, packaging, and marking. Additionally, the contract requires a CMMC Level 2 self-assessment and adherence to specific cybersecurity and data non-disclosure conditions.

DLA WEAPONS SUPPORT ASC COMMODITIES DIVISION

POSTED

about 3 hours ago

DEADLINE

More opportunities from Department Of Defense → Defense Logistics Agency

Same awarding agency

MIL-STD Packaging and Logistics ServicesThis subcontract for MIL-STD Packaging and Logistics Services supports prime contractors fulfilling Defense Logistics Agency supply contracts. The scope of work involves providing specialized military-grade packaging and palletization services, ensuring all items are processed according to MIL-STD-129, RP001, and ASTM D3951 standards. The provider must utilize compliant labeling and industrial equipment to deliver shipments that are fully prepared for FOB Origin transport. The project is managed under NAICS code 561910 for the Department of Defense and will be performed in Phoenix, Arizona. Interested parties should note the response deadline of November 9, 2026, for this specific logistics requirement.

Packaging and Labeling Services

POSTED

about 3 hours ago

DEADLINE

Safety Cone Supplier (NSN 6250-00-334-6183)This subcontract involves the procurement of 589 safety cones to support prime contractors fulfilling Defense Logistics Agency supply contracts. The supplier is responsible for manufacturing or sourcing cones identified by NSN 6250-00-334-6183, ensuring all materials strictly adhere to the DLA Master List of Technical/Quality requirements and comply with the Buy American Act. The completed order of 589 safety cones must be delivered FOB Origin to Phoenix, Arizona. This requirement falls under NAICS code 339999 and is managed by the Department of Defense for the Defense Logistics Agency.

All Other Miscellaneous Manufacturing

POSTED

about 3 hours ago

DEADLINE

Supply of Toggle Switches (NSN 5930-00-655-1507)This subcontract involves the supply of 11 toggle switches for prime contractors supporting Defense Logistics Agency contracts. The switches must strictly adhere to NSN 5930-00-655-1507 specifications, with a specific prohibition against the use of additive manufacturing. All items must be delivered FOB Destination and must comply with packaging and marking standards established by MIL-DTL-28786, MIL-STD-129, and RP001. The contractor is required to maintain rigorous cybersecurity and data protection standards, specifically ensuring compliance with NIST SP 800-171 and DFARS 252.204-7012. This procurement falls under NAICS code 334419 and is managed through the Department of Defense.

Other Electronic Component Manufacturing

POSTED

about 3 hours ago

DEADLINE

Domestic Electrical Component Supply (Berry Amendment Compliant)This subcontract involves the supply of raw wire, connectors, shielding, and housing for prime contractors working on Defense Logistics Agency procurement projects specifically for NSN 5995-01-696-1261. The provider is responsible for sourcing electrical grade materials that meet strict technical requirements and must include a Certificate of Conformance with all delivered components. A critical requirement of this agreement is the provision of certification of origin to ensure full compliance with the Buy American Act and the Berry Amendment. Managed under NAICS code 335131 for the Department of Defense, the contract ensures that all domestic electrical components meet the necessary federal standards for military application.

Residential Electric Lighting Fixture Manufacturing

POSTED

about 3 hours ago

DEADLINE

Special Purpose Electrical Cable Assembly FabricationThis subcontract involves the fabrication and assembly of a special purpose electrical cable assembly, specifically NSN 5995-01-696-1261, for prime contractors working on Defense Logistics Agency procurement projects. The manufacturer is required to produce one completed, tested, and packaged assembly in strict accordance with the DLA Master List of Technical and Quality Requirements (RA001), with a specific prohibition against the use of additive manufacturing. All deliverables must be packaged and marked according to MIL-STD-129 and MIL-STD-2073-1E standards. This opportunity falls under NAICS code 335931 and is managed by the Department of Defense. Interested parties must respond by November 5, 2026.

Current-Carrying Wiring Device Manufacturing

POSTED

about 3 hours ago

DEADLINE

Supplier of Flat Washers (NSN 5310-01-097-9936)This subcontract involves the procurement of 109 specialized flat washers to support Defense Logistics Agency aircraft component projects. The supplier is responsible for manufacturing or sourcing the components in strict accordance with Sikorsky Aircraft Corporation part number SS5104-01 and NSN 5310-01-097-9936. All items must be delivered to DLA Distribution DDSP New Cumberland. The contract mandates rigorous adherence to quality and regulatory standards, including compliance with the Buy American Act and the Berry Amendment. Packaging must meet ASTM D3951 specifications, while marking and palletization must follow MIL-STD-129 and RP001 guidelines. The opportunity falls under NAICS code 332722 and is managed by the Department of Defense.

Bolt, Nut, Screw, Rivet, and Washer Manufacturing

POSTED

about 3 hours ago

DEADLINE

Military-Spec Packaging and International Shipping (Guam)This subcontract through the Defense Logistics Agency involves specialized military packaging, marking, and international transportation services for prime contractors delivering supplies to Guam. The scope of work specifically requires the packaging of mufflers in accordance with ASTM D3951, marking per MIL-STD-129, and palletization following RP001 requirements. The selected provider must utilize the fastest traceable shipping methods to ensure delivery to the MESG One Detachment in Guam. This opportunity falls under NAICS code 488330 and is managed by the Department of Defense.

Navigational Services to Shipping

POSTED

about 3 hours ago

DEADLINE

Exhaust Muffler Supply (NSN 2990-01-566-4579)This subcontract involves the manufacture or procurement of one specialized exhaust muffler, identified by NSN 2990-01-566-4579, to support prime contractors fulfilling Defense Logistics Agency supply contracts. The provider must ensure the product complies with DLA Master List of Technical and Quality Requirements RA001 and RQ011, while maintaining strict supply chain traceability documentation as specified in the contract terms. Managed under NAICS code 336390 for the Department of Defense, the agreement requires the delivery of a single completed unit. The solicitation was posted on October 28, 2026, with a response deadline set for November 4, 2026.

Other Motor Vehicle Parts Manufacturing

POSTED

about 3 hours ago

DEADLINE

Supply of Enamel (NSN 8010-00-297-0554)This subcontract involves the supply of 5,000 gallons of enamel paint to prime contractors supporting Defense Logistics Agency Troop Support contracts. The material must strictly adhere to NSN 8010002970554 and UFGS-09900 Division 09 specifications, while remaining compliant with the DLA Master List of Technical and Quality Requirements. Delivery is designated as FOB Destination, with the place of performance located at Hunter AAF. The contractor is responsible for ensuring all packaging and labeling meet MIL-STD-129 and MIL-STD-2073-1E standards, specifically including the provision of lot and batch numbers. This procurement falls under NAICS code 325510 and is managed by the Department of Defense. The response deadline for this requirement is November 3, 2026.

Paint and Coating Manufacturing

POSTED

about 3 hours ago

DEADLINE

Supply of Sleeve Spacers (NSN 5365-01-566-4847)This subcontract involves the manufacture or sourcing of four sleeve spacer units, identified by NSN 5365-01-566-4847, to support prime contractors under a Defense Logistics Agency supply contract. The selected provider must ensure all materials comply with the Buy American Act and the Berry Amendment. Final delivery of the units is required at Fort Bragg, North Carolina. Strict adherence to technical specifications is mandatory, including packaging according to ASTM D3951, labeling per MIL-STD-129, and palletization following RP001 standards. The opportunity falls under NAICS code 332721 and is managed through the Department of Defense.

Precision Turned Product Manufacturing

POSTED

about 3 hours ago

DEADLINE

Mold Release Agent Supplier (NSN 8030-01-233-1265)This subcontract involves the supply of a specific mold release agent, identified by NSN 8030-01-233-1265, to support prime contractors fulfilling Defense Logistics Agency requirements. The supplier must provide one 5-gallon can delivered FOB Destination to Illinois and US APO AE. To ensure product integrity, the agent must maintain a 12-month shelf life and be stored at temperatures between 60 and 80 degrees Fahrenheit. The contractor is required to adhere to strict regulatory and military standards, including compliance with the Buy American Act, the Berry Amendment, and 29 CFR 1910.1200. Additionally, all shipments must be packaged and marked in accordance with MIL-STD-2073-1E and MIL-STD-129. This procurement falls under NAICS code 325998 and is managed through the Department of Defense.

All Other Miscellaneous Chemical Product and Preparation Manufacturing

POSTED

about 3 hours ago

DEADLINE

Supply of Refractory Castable Mix (NSN 9350015694317)This subcontract involves the supply of refractory castable mix to prime contractors supporting Defense Logistics Agency contracts for the USS George H W Bush and USS Abraham Lincoln. The provider is responsible for manufacturing or sourcing material that meets NSN 9350015694317, with strict requirements for packaging according to MIL-STD-2073-1E and marking per MIL-STD-129. The agreement mandates full compliance with the Buy American Act and the Hazard Communication Standard. The scope of work requires the delivery of two units of castable mix on a FOB Destination basis. This procurement falls under NAICS code 327120 and is managed through the Department of Defense. Interested parties must adhere to the response deadline of November 9, 2026.

Clay Building Material and Refractories Manufacturing

POSTED

about 3 hours ago

DEADLINE

Earlier notices in this NAICS code

Posted before this notice, open and closed

BEARING, ROLLER

Solicitation # SPE4A6-26-R-X863

Defense Logistics Agency

POSTED

DEADLINE

BEARING, WASHER, THRUST

Solicitation # SPE7LX26FAWKT

Defense Logistics Agency

POSTED

DEADLINE

SHIELD, BEARING, REPLAC

Solicitation # SPE4A6-26-T-67U1

Defense Logistics Agency

POSTED

CLOSED

BEARING, SLEEVE

Solicitation # SPE7LX26FAWFQ

Defense Logistics Agency

POSTED

DEADLINE

31--BEARING,ROLLER,CYLI

Solicitation # SPE4A626RX6460001

POSTED

DEADLINE

Precision Roller Bearing Manufacturing and Supply

POSTED

DEADLINE

Sleeve Busing Component Manufacturing

ASC COMMODITIES DIVISION

POSTED

CLOSED

Precision Bearing and Washer Component Manufacturing

Defense Logistics Agency

POSTED

DEADLINE

Ball Bearing Supply (Annular Bearing)

Defense Logistics Agency

POSTED

DEADLINE

Ball Bearing Supply – NSN 3110002273620

ASC COMMODITIES DIVISION

POSTED

CLOSED

Supply of Spherical Plain Bearings for DLA

Defense Logistics Agency

POSTED

DEADLINE

Supply of Plain Bearing Units (NSN 3130-01-615-0248)

Defense Logistics Agency

POSTED

DEADLINE

Ready to Pursue This Opportunity?

Get AI-powered intelligence on this solicitation and the ones like it

Every page of the solicitation package shredded into a compliance breakdown

AI-powered matching based on your capabilities and past performance

Competitor and incumbent history on the requirement

Automated alerts on amendments, Q&A deadlines, and award

Join 750+ contractors already using CLEATUS