ASME B18.2.1 Grade A Hex Bolt 1/4 × 1-1/4 in – UNC 20 TPI – Hot Dip Galvanized

Manufacturer: TTBOLT
SKU: TTB-ASMEB18.2.1-A-025X125-UNC-20TPI-HDG
ASME B18.2.1 Grade A Hex Bolt
Size: 1/4 × 1-1/4 in
Thread: UNC 20 TPI
Thread length: 3/4 in
Width across flats: 7/16 in
Head height: 3/16 in
Material: Carbon Steel
Finish: Hot Dip Galvanized
Estimated mass: 10.359 g/pc

This Hex Bolt is manufactured and supplied by TTBolt in accordance with ASME B18.2.1.

This exact catalog variant has size 1/4 × 1-1/4 in, thread UNC 20 TPI, material Carbon Steel, grade A and finish Hot Dip Galvanized. It is intended for mechanically fastened joints that require the stated dimensions, thread, grade and finish.

Technical data for this exact variant

StandardASME B18.2.1
Product typeHex Bolt
Size1/4 × 1-1/4 in
ThreadUNC 20 TPI
Thread directionRight Hand
MaterialCarbon Steel
Grade / property classA
FinishHot Dip Galvanized
Head height3/16 in
Width across flats7/16 in
Basic thread length3/4 in
Plain shank length1/2 in
Mass per piece10.359 g/pc
Mass per 100 pieces1.0359 kg/100 pc

Selection and ordering notes

Before ordering, confirm the required size (1/4 × 1-1/4 in), thread (UNC 20 TPI), grade (A) and finish (Hot Dip Galvanized). Price calculations may use the theoretical mass shown above; final manufactured mass can vary with dimensional tolerances, chamfers, radii, coating thickness and production process.

Technical data sheet
TTBolt

Industrial Fasteners Engineering Data Sheet

Document
Technical Data Sheet
Standard
ASMEB18.2.1
Grade
A
Issued
2026-10-05

نقشه ابعادی شماتیک

نقشه ابعادی

پیچ شش‌گوش ASME B18.2.1 گرید A سایز 1/4 × 1-1/4 اینچ، رزوه UNC 20 TPI، گالوانیزه گرم

1/4 x 1.25 in | A | پوشش Hot Dip Galvanized

نماهای واقعی محصول

ISO
ایزومتریک
Rear
نمای مکمل
Side
نمای جانبی

جدول ابعادی

پارامترنماد حداقلحداکثر / اسمی واحد
قطر اسمیd-0.25in
گام رزوهn-20TPI
عرض آچارخورs-0.438in
ارتفاع سرk-0.188in
طولl-1.25in

مشخصات محصول

رزوه1/4 20 TPI UNC
جهت رزوهراست‌گرد
گریدA
پوششHot Dip Galvanized
متریالCarbon Steel
فرم رزوهUnified 60 deg

یادداشت‌های فنی

1. تمام ابعاد بر حسب اینچ هستند مگر آنکه خلاف آن ذکر شده باشد.
2. تصاویر محصول از مدل Master در SolidWorks و با همان پارامترهای این ردیف تولید می‌شوند.
3. مقادیر حداقل و حداکثر از جدول ابعادی ASMEB18.2.1 گرفته شده‌اند؛ جایی که استاندارد تلرانس تعریف نکرده، تنها مقدار اسمی درج شده است.
4. وزن‌های درج‌شده در فروشگاه نظری‌اند و برای برآورد قیمت کاربرد دارند.

شماره قطعه
TTB-ASMEB18.2.1-A-025X125-UNC-20TPI-HDG

PARAMETRIC DIMENSIONAL SCHEMATIC

Dimensional schematic

Hex Bolt - ASMEB18.2.1

1/4 x 1.25 in | A | Hot Dip Galvanized Finish

ACTUAL PRODUCT VIEWS

ISO
ISO
Rear
Rear
Side
Side

DIMENSION TABLE

ParameterSymbol MinMax / Nominal Unit
Nominal diameterd-0.25in
Threads per inchn-20TPI
Width across flatss-0.438in
Head heightk-0.188in
Lengthl-1.25in

PRODUCT DATA

Thread1/4 20 TPI UNC
Thread directionRight hand
GradeA
FinishHot Dip Galvanized
MaterialCarbon Steel
Thread formUnified 60 deg

TECHNICAL NOTES

1. All dimensions are in inches unless stated otherwise.
2. Product views are generated from the SolidWorks master using the parameters of this row.
3. Minimum and maximum values are taken from the ASMEB18.2.1 dimension table; where the standard defines no tolerance, only the nominal value is shown.
4. Catalog weights are theoretical and intended for price estimation.

Part number
TTB-ASMEB18.2.1-A-025X125-UNC-20TPI-HDG

Products specifications

Attribute name Attribute value
Standard ASME B18.2.1
Product Type Hex Bolt
Thread Length 3/4 in
Width Across Flats 7/16 in
Head Height 3/16 in
Material Carbon Steel
Property Class / Grade A
Finish Hot Dip Galvanized
Unit System in
Estimated Weight 10.359 g/pc
Thread
Thread Type UNC
Thread Pitch 20 TPI
Thread Direction Right Hand
Dimensions
Diameter 1/4 in
Length 1-1/4 in