Authorized NSI Industries Distributor
NSI Industries JCB21 - Carriage Bolt, Steel material, Zinc, Mushroom Head, 2-1/2 in. length, 5/16-18 in. Size, Right Hand thread, 100 per pack
NSI Industries

JCB21

Alternate Item Number: 76721

UPC: 639720767216


Documents & Media
Specification Sheet

Contact for Pricing

Minimum Qty: 100

Multiplier: 100

*Contact for lower quantities*

Overview

The NSi Industries JCB21 Carriage Bolt is a precision-engineered steel fastener designed for heavy-duty industrial fastening applications. Constructed from Grade 2 steel with a uniform zinc-plated finish, this bolt provides reliable corrosion resistance in outdoor and high-moisture environments. The distinctive mushroom head features an integrated square neck that prevents rotation during installation, ensuring a secure, vibration-resistant connection when paired with standard washers and nuts. With a right-hand thread specification of 5/16-18 UNC and a total length of 2.5 inches, the JCB21 delivers consistent clamping force across wood, metal, and composite substrates. This carriage bolt is optimized for gravity feed jar dispensing systems, allowing for efficient bulk handling and reduced assembly time in production environments. The 100-piece packaging provides cost-effective inventory management for OEMs, contractors, and industrial distributors. Compatible with standard 5/16-inch hardware, the JCB21 meets industrial-grade fastening requirements for machinery assembly, structural connections, and equipment fabrication. NSi Industries, a U.S.-based manufacturer, ensures dimensional accuracy and material consistency for dependable performance in construction, manufacturing, and maintenance applications.
  • Material: Grade 2 steel with zinc-plated corrosion-resistant finish
  • Head Type: Mushroom head with integrated square neck to prevent rotation
  • Thread Specifications: 5/16-18 UNC, right-hand thread, fully threaded
  • Length: 2.5 inches (2-1/2 in.)
  • Packaging: 100 bolts per pack for bulk industrial use

Specifications

Application
Electrical, Plumbing, Heating, Air Conditioning Industries
Finish
Zink Chromate
Head Type
Mushroom Head
Length
2-1/2 in
Material
Steel
Size
5/16-18 IN
Thread
Right Hand
Thread Type
Right Hand
Type
Carriage Bolt
Package Dimensions (L x W x H)
4.5 IN x 4.5 IN x 7.25 IN
Package Dimensions (L x W x H)
11.43 cm x 11.43 cm x 18.415 cm
Package Weight (Imperial)
5.640 L
Package Weight (Metric)
2.558 kg
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Frequently Asked Questions

What materials are JCB series carriage bolts made from?

JCB series carriage bolts are made from 18-8 Stainless Steel and 316 Stainless Steel.

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