Bolts

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A bolt has a shank, an unthreaded length directly under the head, making it stronger than a screw, which is threaded along its entire length. The threaded length on imperial bolts is twice the diameter, plus 1/4”; e.g. 3/8 UNF bolts have a threaded length of (2 x 3/8) + 1/4 = 1”, the remainder being the shank. The metric formula is twice the diameter, plus 6mm (bolts longer than 5”/125mm are different, but are not relevant here). Most Mini bolts have plain hexagonal (‘hex’) heads, but from the mid-1980s flanged hex head bolts were used in some applications.

           
Hex Head UNC Bolts
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Spanner Size
BH504131 1/4" UNC 1 5/8" Zinc 7/16 AF
BH505181 5/16" UNC 2 1/4" Zinc 1/2 AF
BH505201 5/16" UNC 2 1/2" Zinc 1/2 AF
BH506221 3/8" UNC 2 3/4" Zinc 9/16 AF
BH507131 7/16" UNC 1 5/8" Zinc 5/8 AF
BH507301 7/16" UNC 3 3/4" Zinc 5/8 AF
           
Hex Head UNF Bolts
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Spanner Size
BH604081 1/4" UNF 1" Zinc 7/16 AF
BH604091 1/4" UNF 1 1/8" Zinc 7/16 AF
BH604111 1/4" UNF 1 3/8" Zinc 7/16 AF
BH604121 1/4" UNF 1 1/2" Zinc 7/16 AF
BH604131 1/4" UNF 1 5/8" Zinc 7/16 AF
BH604141 1/4" UNF 1 3/4" Zinc 7/16 AF
BH604151 1/4" UNF 1 7/8" Zinc 7/16 AF
HBZ420 1/4" UNF 2 1/2" Zinc 7/16 AF
BH605101 5/16" UNF 1 1/4" Zinc 1/2 AF
BH605111 5/16" UNF 1 3/8" Zinc 1/2 AF
BH605121 5/16" UNF 1 1/2" Zinc 1/2 AF
BH605131 5/16" UNF 1 5/8" Zinc 1/2 AF
BH605141 5/16" UNF 1 3/4" Zinc 1/2 AF
BH605151 5/16" UNF 1 7/8" Zinc 1/2 AF
BH605161 5/16" UNF 2" Zinc 1/2 AF
BH605201 5/16" UNF 2 1/2" Zinc 1/2 AF
BH605261 5/16" UNF 3 1/4" Zinc 1/2 AF
BH605301 5/16" UNF 3 3/4" Zinc 1/2 AF
BH605341 5/16" UNF 4 1/4" Zinc 1/2 AF
BH606131 3/8" UNF 1 5/8" Zinc 9/16 AF
BH606171 3/8" UNF 2 1/8" Zinc 9/16 AF
BH606181 3/8" UNF 2 1/4" Zinc 9/16 AF
BH606201 3/8" UNF 2 1/2" Zinc 9/16 AF
           
Hex Head UNF High Tensile Bolts
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Spanner Size
BT604161 1/4" UNF 2" Zinc 7/16 AF
BT605161 5/16" UNF 2" Zinc 1/2 AF
BT606281 3/8" UNF 3 1/2" Zinc 9/16 AF
BT606411 3/8" UNF 5 1/8" Zinc 9/16 AF
           
Hex Head Metric Fine Bolts
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Spanner Size
BH106091 6mm (M6) Metric Fine 45mm Zinc 10mm
BH106111 6mm (M6) Metric Fine 55mm Zinc 10mm
BH108081 8mm (M8) Metric Fine 40mm Zinc 13mm
BH108085 8mm (M8) Metric Fine 40mm Black 13mm
           
Flanged Head UNC Bolts
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Spanner Size
DAM7755 5/16" UNC 1" Zinc 1/2 AF
DAM7754 5/16" UNC 1 1/8" Zinc 1/2 AF
DAM7756 5/16" UNC 1 1/8" Patchlok 1/2 AF
DAM7759 5/16" UNC 1 3/4" Zinc 1/2 AF
DAM7760 5/16" UNC 2 1/2" Zinc 1/2 AF
DAM7761 5/16" UNC 3 1/4" Zinc 1/2 AF
TAM1188 7/16" UNC 1 1/2" Zinc 5/8 AF
           
Flanged Head UNF Bolts
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Spanner Size
TAM1174 1/4" UNF 1 1/2" Zinc 7/16 AF
DAM7753 5/16" UNF 7/8" Zinc 1/2 AF
TAM1178 5/16" UNF 1 1/4" Zinc 1/2 AF
DAM7758 5/16" UNF 1 3/4" Zinc 1/2 AF
TAM1180 5/16" UNF 1 7/8" Zinc 1/2 AF
           
Flanged Head Metric Fine Bolts
Part No Nom. Thread Dia. Thread Type Overall Length Remarks Spanner Size
FB106067 6mm (M6) Metric Fine 30mm Zinc 10mm
FB106081 6mm (M6) Metric Fine 40mm Zinc 10mm
FB106095 6mm (M6) Metric Fine 45mm Black 10mm
FB108091 8mm (M8) Metric Fine 45mm Zinc 13mm
FB108241 8mm (M8) Metric Fine 120mm Zinc 13mm
FB110141P 10mm (M10) Metric Fine 70mm Pointed 17mm

 

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