At GDPA, we manufacture Bolts using Hot Forging, Cold Forming, Upsetting & Machining Processes

Materials & Grades
Materials & Grades

Carbon Steel, Alloy Steel (Low, Medium and High). Grades Offered - 4.6/4.8, 5.6/5.8, 6.8, 8.8, 10.9, 12.9
Brass
Stainless Steel A2 / A4

We have 4-station / 5-station Cold Forming machines, Heavy Forging Stations, Forging Upsetters, Metal Gathering Stations with an installed capacity of approximately 800 – 1000 mt per month and growing year on year. Forging done through plc controlled induction heaters ensure precise temperature of billets for getting well-formed heads and a contained grain flow. This reduces stress ensuring no failures due to stress, fatigue, impact etc.

Cold Forming

Diameter M6 - M24
Length 10 - 450mm
Our specialization - Long Length Parts (Diameter M24 & Length 450mm)

Hot Forging

Diameter M12 - M80
Length 30 - 2000mm
Our specialization - Long Length Bolts (Diameter M80 & Length 2000mm)

Product Range

Standard Hex Bolts & Screws
Specifications Grade Thread Diameter Length
DIN 601/558 GR - 4.6/4.8/5.6/5.8/6.8 METRIC 6G/8G M8-M80 Upto 2 MTR
ANSI B.18.2.1 BS 916 GR - ASTM A 307-A GR - 4.6/4.8/5.6/5.8/6.8/8.8 UNC/UNF-2A BSW/BSF UNC/UNF-2A BSW/BSF 3/8"-2 INCH 3/8"-2 INCH Upto 24"Upto 24"
BS 4190 GR - 4.6/4.8/5.6/5.8/6.8/8.8 UNC/UNF-2A BSW/BSF 3/8"-2 INCH Upto 24"
DIN 7990 GR - 4.6/4.8/5.6/5.8/6.8/8.8 METRIC 6G/8G M8-M80 Upto 2 MTR
IS:1363 (PART-1) GR - 4.6/4.8/5.6/5.8/6.8 UNC/UNF-2A BSW/BSF 3/8"-2 INCH Upto 24"
IS 1083 GR - 4.6/4.8/5.6/5.8/6.8 UNC/UNF-2A BSW/BSF 3/8"-2 INCH Upto 24"
Precision Hex Bolts & Screws
Specifications Grade Thread Diameter Length
DIN931/933 GR - 4.6/4.8/5.6/5.8/6.8/8.8/10.9/12.9 METRIC 6G/8G M8-M80 Upto 2 MTR
BS 3692 GR - 4.6/4.8/5.6/5.8/6.8/8.8/10.9/12.9 UNC/UNF-2A BSW/BSF 3/8"-2 INCH Upto 24"
BS 1768 GR - T/V/X, GR - 2/5/8 OF SAE J429 UNC/UNF-2A BSW/BSF 3/8"-2 INCH Upto 24"
ANSI B.182.1 GR - ASTM A-449, ASTM A-354, A, B, D UNC/UNF-2A BSW/BSF 3/8"-2 INCH Upto 24"
ISO 4014/4017 GR - 4.6/4.8/5.6/5.8/6.8/8.8/10.9/12.9 METRIC 6G/8G M8-M80 Upto 2 MTR
BS 4190 GR - 4.6/4.8/5.6/5.8/6.8/8.8/10.9/12.9 METRIC 6G/8G M8-M80 Upto 2 MTR
Carriage Bolts, Cup Square Bolts, Cup Round Bolts & Cup Oval Bolts
Specifications Grade Thread Diameter Length
DIN 603 GR - 4.6/4.8/5.6/5.8/6.8/8.8 METRIC 6G/8G M6-M24 600MM
BS 4933 GR - 4.6/4.8/5.6/5.8/6.8/8.8 METRIC 6G/8G M6-M24 600MM
ANSI B.18.5 GR - ASTM A307-A UNC/UNF-2A BSW/BSF 1/4"-1.1/2" 18 INCH
ANSI B.18.10 GR - ASTM A307-A UNC/UNF-2A BSW/BSF 1.4"-1.6" 18 INCH
Sq. Sq. Bolts, Square Bolts & Hanger Bolts
Specifications Grade Thread Diameter Length
BS 7419 GR - 4.6/4.8/5.6/5.8/6.8/8.8/10.9 METRIC 6G/8G M12-M48 Upto 2 MTR
ANSI B.18.2.1 GR - ASTM A 307-A UNC/UNF-2A 1/2"-1.1/2" 40 INCH
TO CUSTOMER DRAWING GR - 4.6/4.8/5.6/5.8/6.8/8.8/10.9 M/UNC METRIC 6G/8G M12-M52 Upto 1 MTR
Tee Bolts
Specifications Grade Thread Diameter Length
DIN 787 GR - 4.6/4.8/5.6/5.8/6.8/8.8/10.9 METRIC 6G/8G M8-M48 400 MM
DIN 186 GR - 4.6/4.8/5.6/5.8/6.8/8.8/10.9 METRIC 6G/8G M8-M48 400 MM
DIN 188 GR - 4.6/4.8/5.6/5.8/6.8/8.8/10.9 METRIC 6G/8G M8-M48 400 MM
DIN 261 GR - 4.6/4.8/5.6/5.8/6.8/8.8/10.9 METRIC 6G/8G M8-M48 400 MM
High Strength Friction Grip Bolts
Specifications Grade Thread Diameter Length
DIN 6914 GR - 8.8/10.9 METRIC 6G/8G M12-M36 600MM
BS 4395-I & II ISO 7412 GR - 8.8/10.9 METRIC 6G/8G M12-M36 600MM
ANSI B.18.2.3.7 GR - ASTM A325M, ASTM A490M UNC/UNF-2A M/UNC 1/2"-1.1/2" Upto 12"
EN-14399-3/4 GR - 8.8/10.9 UNC/UNF-2A M/UNC 1/2"-1.1/2" Upto 12"
ASTM A325M GR - 8.8/10.9 METRIC 6G/8G M12-M36 600MM
ASTM A490M GR - 8.8/10.9 METRIC 6G/8G M12-M36 600MM
DASt STD. GR - 8.8/10.9 METRIC 6G/8G UPTO M64 600MM
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