{"id":6585,"date":"2023-06-22T18:18:42","date_gmt":"2023-06-22T10:18:42","guid":{"rendered":"https:\/\/xzfastener.com\/?p=6585"},"modified":"2026-06-17T18:20:04","modified_gmt":"2026-06-17T10:20:04","slug":"bolt-thread-length-guide-full-thread-half-thread-and-custom-lengths","status":"publish","type":"post","link":"https:\/\/xzfastener.com\/ru\/bolt-thread-length-guide-full-thread-half-thread-and-custom-lengths\/","title":{"rendered":"Bolt Thread Length Guide: Full Thread, Half Thread and Custom Lengths"},"content":{"rendered":"

Bolt thread length is one of the details buyers often miss in RFQs. The bolt diameter and overall length may be correct, but the assembly can still fail if the threaded section is too short, too long, or placed in the wrong load area.<\/p>\n\n\n\n

In international purchasing, \u201chalf thread\u201d usually means a partially threaded bolt. It does not always mean exactly 50% thread. The actual thread length depends on the standard, bolt size, and overall length.<\/p>\n\n\n\n

Full Thread vs Half Thread Bolts<\/h2>\n\n\n\n

A full thread bolt has threads along most or all of the shank. A half thread bolt, or partially threaded bolt, has an unthreaded shank section below the head.<\/p>\n\n\n\n

Both are useful, but they are not interchangeable in every assembly.<\/p>\n\n\n\n

Bolt Type<\/th>\u041e\u0431\u0449\u0438\u0435 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u044b<\/th>Typical Use<\/th>Key Concern<\/th><\/tr><\/thead>
Full thread bolt<\/td>DIN 933, ISO 4017<\/td>General fastening, thin parts, adjustable clamping<\/td>Thread may enter shear area<\/td><\/tr>
Partial thread bolt<\/td>DIN 931, ISO 4014<\/td>Thicker joints, shear-loaded connections<\/td>Shank length must match grip length<\/td><\/tr>
Custom thread length bolt<\/td>Drawing-based<\/td>OEM, machinery, fixtures, special structures<\/td>Needs clear drawing and tolerance<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Buyers can review common bolt products<\/a> \u0438\u043b\u0438 standard fasteners<\/a> before deciding which thread style fits the application.<\/p>\n\n\n\n

Why Thread Length Matters<\/h2>\n\n\n\n

Thread length affects nut engagement, clamp force, shear strength, installation clearance, and cost.<\/p>\n\n\n\n

Key Selection Points<\/h3>\n\n\n\n
Factor<\/th>Why It Matters<\/th><\/tr><\/thead>
Nut engagement<\/td>Too little engagement can cause thread stripping<\/td><\/tr>
Grip length<\/td>The unthreaded shank should fit the clamped parts when needed<\/td><\/tr>
Shear plane<\/td>Threads in the shear plane may reduce joint performance<\/td><\/tr>
Installation space<\/td>Excess thread may interfere with nearby parts<\/td><\/tr>
Coating thickness<\/td>HDG or coated threads may need fit checks<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

For high-load joints, thread length should be confirmed together with bolt grade, nut grade, and washer hardness. Buyers handling heavy-duty applications should also compare high-strength fasteners<\/a>.<\/p>\n\n\n\n

When to Choose Full Thread Bolts<\/h2>\n\n\n\n

Full thread bolts are practical when:<\/p>\n\n\n\n