Starrett Lock Bolt Assembly for 6″ Square Head PT99004 Seamless Fit

Description

Product Overview

The Starrett PT99004 lock bolt assembly is a precision‑engineered component designed specifically for the 6‑inch square head configuration found in a wide range of measuring and layout tools. Crafted from hardened, corrosion‑resistant steel, this bolt delivers a seamless integration that eliminates play and ensures the square head remains firmly locked during demanding tasks. With dimensions of 6 x 3.4 x 0.7 inches and a weight of just 0.16 ounces, the assembly offers a compact yet robust solution that fits comfortably within tight tool housings while providing the strength required for high‑torque applications. The bolt’s threaded design follows Starrett’s exacting standards, guaranteeing consistent thread engagement and repeatable positioning, which is essential for professionals who rely on precision alignment in machining, metalworking, and quality‑control environments. Additionally, the PT99004 model is backed by Starrett’s long‑standing reputation for durability, meaning users can expect a long service life even under continuous use in harsh industrial settings.

Usage

Designed for industrial and scientific professionals, this lock bolt assembly excels in applications where secure fastening and quick component replacement are critical. Machinists will appreciate the bolt’s ability to maintain square head stability during high‑speed spindle operations, while calibration technicians can rely on its consistent lock‑in performance when setting up precision measurement equipment. The assembly is also well‑suited for maintenance crews tasked with repairing or upgrading equipment on the shop floor, as its easy‑to‑replace design reduces downtime and minimizes the need for specialized tools. Whether used in a manufacturing plant, a laboratory, or a field service scenario, the PT99004 provides the confidence that the tool will stay locked in place, preventing slippage that could compromise accuracy or safety. Its compact size allows it to be stored in standard tool kits, and the steel construction ensures it can withstand exposure to oils, coolants, and other industrial fluids without degradation.

Why Choose Us

Choosing the Starrett PT99004 lock bolt assembly means selecting a component that embodies over a century of engineering excellence. Starrett’s rigorous quality‑control processes include full‑scale testing of each bolt for torque tolerance, thread integrity, and material hardness, ensuring that every unit meets the exact specifications required for high‑precision work. Unlike generic alternatives, this assembly is tailored to the 6‑inch square head, eliminating the need for adapters or makeshift solutions that can introduce error. The product’s discontinued‑by‑manufacturer status is false; Starrett continues to produce this model, guaranteeing ongoing availability and support. Customers benefit from a responsive after‑sales service team that can provide technical assistance, replacement parts, and warranty coverage, reinforcing the brand’s commitment to long‑term reliability. Moreover, the PT99004’s competitive pricing, at $22.35, delivers exceptional value when compared to comparable lock bolts that often cost significantly more for similar performance. By investing in this assembly, users gain a trustworthy, cost‑effective component that enhances the overall performance of their tools and equipment.

Key Features

• Hardened steel construction provides long‑lasting durability and resistance to corrosion.
• Exact fit for 6‑inch square heads eliminates wobble and ensures consistent locking.
• Threaded design offers quick installation and removal, reducing equipment downtime.
• Compact dimensions allow storage in standard tool kits without sacrificing strength.
• Starrett’s dedicated customer support ensures assistance and replacement parts when needed.

FAQ

What tools are required to install the PT99004 lock bolt assembly?

The assembly uses standard metric or SAE hex wrenches that match the bolt head size, typically a 5 mm or 3/16‑inch socket. No specialized equipment is needed, making it easy for technicians to replace the bolt on the shop floor.

Can this lock bolt be used with other square head sizes?

While the PT99004 is optimized for a 6‑inch square head, it may physically fit larger heads, but the locking performance could be reduced due to mismatched dimensions. For best results, use the bolt with the intended 6‑inch size to maintain the engineered fit and torque specifications.

Is the bolt compatible with stainless‑steel square heads?

Yes, the PT99004’s hardened steel threads are compatible with stainless‑steel square heads, provided the head’s threading matches the bolt’s pitch. The steel‑to‑steel contact ensures a secure lock, though users should verify thread compatibility before installation.

How does Starrett ensure the quality of each lock bolt?

Each bolt undergoes a multi‑stage quality assurance process that includes material certification, hardness testing, dimensional inspection, and torque verification. This systematic approach guarantees that every PT99004 meets the stringent performance standards expected by industrial professionals.

What is the warranty coverage for this lock bolt assembly?

Starrett offers a limited one‑year warranty covering manufacturing defects. If the bolt fails due to material or workmanship issues within this period, Starrett will provide a replacement at no additional cost, reinforcing confidence in the product’s durability.