AF Double ended box spanners

Spanner sizes are the same as the width of the nut or bolt head measured in inches across the hexagon flats.

Melform Engineers Tools AF Double ended box spanners

TA – Code Size ins
Length across ins-mm
Across hexagon flats ins Hole size mm


TA.0 1/4 x 5/16 4 – 100 0.250 x 0.312 4.8


TA.1 5/16 x 3/8 4 – 100 0.312 x 0.375 6.35


TA.2 3/8 x 7/16 4 – 100 0.375 x 0.437 6.35


TA.4 7/16 x 1/2 4 – 100 0.437 x 0.500 8


TA.6 1/2 x 9/16 4 – 100 0.500 x 0.562 8


TA.8 9/16 x 5/8 5 – 125 0.562 x 0.625 8


TA.11 5/8 x 3/4 5 – 125 0.625 x 0.750 9.5


TA.12 11/16 x 3/4 6 – 150 0.687 x 0.750 9.5


TA.14 3/4 x 7/8 5 – 125 0.750 x 0.875 9.5


TA.16 13/16 x 7/8 5 – 125 0.812 x 0.875 9.5


TA.17 7/8x 15/16 5 – 125 0.875 x 0.937 9.5


TA.18 7/8 x 1 6 – 150 0.875 x 1.000 9.5


TA.20 15/16 x 1 7 – 175 0.937 x 1.000 9.5


TA.21 1x 1-1/8 7 – 175 1.000 x 1.125 9.5


TA.22 15/16 x 1-1/8 6 – 150 0.937 x 1.125 9.5


TA.23 1-1/4 x 1-7/16 7-1/2 – 190 1.250 x 1.437 12.7


TA.24 1-5/16 x 1-1/2 7-1/2 – 190 1.312 x 1.500 12.7


TA.25 1-5/8 x 1-13/16 7-1/2 – 190 1.625 x 1.812 12.7


ISO double ended Metric TIM range

Melform Engineers ISO double ended Metric TIM range

TIM – Code Size Across flats mm
Length ins-mm Across hexagon flats ins
Nominal bolt size T bar mm


TIM.2 5 x 5.5 4 – 100 .196 x .127 M2.5 x M3 4.8


TIM.3 7 x 8 4 – 100 .278 x .319 M4 x M5 6.35


TIM.4 8 x 10 4 – 100 .319 x .398 M5 x M6 6.35


TIM.5 13 x 17 5 – 125 .516 x .673 M8 x M10 6.35


TIM.6 19 x 22 5 – 125 .752 x .872 M12 x M14 8


TIM.7 24 x 27 6 – 150 .953 x 1.062 M16 x M18 9.5


TIM.8 30 x 32 6 – 150 1.181 x 1.259 M20 x M22 9.5


TIM.9 36 x 41 7 – 175 1.417 x 1.614 M24 x M27 12.7


TIM.10 46 x 50 7 – 175 1.811 x 1.968 M30 x M33 15.5


TIM.11 55 x 60 8 – 200 2.165 x 2.362 M36 x M39 15.5


TIM.12 65 x 70 8 – 200 2.559 x 2.755 M42 x M45 15.5


TIM.13 75 x 80 8 – 200 2.953 x 3.149 M48 x M52 15.5


Metric double ended TM range

Melform Engineers Metric double ended TM

TM – Code Size Across flats (mm)
Length (ins-mm) Across Hexagon flats (ins)
T Bar (mm)


TM.1 6 x 7 4 – 100 .238 x .278 4.8


TM.4 8 x 9 4 – 100 .319 x .358 4.8


TM.6 10 x 11 4 – 100 .398 x .437 6.35


TM.7 10 x 11 7 – 175 .398 x .437 6.35


TM.8 12 x 13 3 1/4 – 82 .476 x .516 6.35


TM.9 12 x 13 4 – 100 .476 x .516 6.35


TM.10 12 x 13 7 – 175 .476 x .516 6.35


TM.11 12 x 14 4 – 100 .476 x .555 6.35


TTS/33 13 x 13 7 – 125 .516 x .526 6.35


TM.13 14 x 15 3 1/4 – 82 .555 x .595 6.35


TM.14 16 x 17 5 – 125 .634 x .673 6.35


TM.16 17 x 19 5 – 125 .673 x .752 8


TM.17 18 x 19 5 – 125 .713 x .752 9.5


TM.19 20 x 21 5 – 125 .793 x .833 9.5


TM.20 20 x 22 5 – 125 .793 x .872 9.5


TM.21 21 x 22 3 1/4 – 82 .833 x .872 9.5


TM.22 22 x 23 5 – 125 .872 x .912 9.5


TTS/40 24 x 24 7 – 175 .955 x .955 9.5


TM.24 24 x 25 6 – 150 .953 x .992 9.5


TM.25 24 x 26 5 – 125 .953 x 1.023 9.5


Double ended box spanners (Whitworth) range

Spanner sizes are determined by the size of the thread on the bolt or stud. Sizes given are BS 2558 Grade B.

Melform Engineers Tools Metric double ended TM

TW – Code Size ins
Length across ins-mm
Across hexagon flats ins Hole size mm


TW.2 1/8 x 3/16 4 – 100 0.338 x 0.445 6.35


TW.4 3/16 x 1/4 4 – 100 0.445 x 0.525 8


TW.7 1/4 x 5/16 4 – 125 0.525 x 0.600 8


TW.10 5/16 x 3/8 5 – 125 0.600 x 0.710 8


TW.13 3/8 x 7/16 5 – 125 0.710 x 0.820 9.5


TW.14 7/16 x 1/2 5 – 125 0.820 x 0.920 9.5


TW.16 1/2 x 9/16 6 – 150 0.920 x 1.010 9.5


TW.18 9/16 x 5/8 6 – 150 1.010 x 1.100 9.5


TW.20 5/8 x 11/16 6 – 150 1.100 x 1.200 9.5


TW.21 5/8 x 3/4 7 – 175 1.100 x 1.300 9.5


TW.23 3/4 x 7/8 7 – 175 1.300 x 1.480 9.5


TW.24 7/8 x 1 7 – 175 1.480 x 1.670 12.7


TW.25 1 x 1-1/8 7 – 175 1.670 x 1.860 12.7


TW.27 1-1/4 x 1-1/2 7 – 175 2.050 x 2.410 12.7


TW.28 -3/8 x 1-1/2 8-1/2 – 215 2.220 x 2.410 12.7


Single ended box spanners Whitworth and metric.

Melform Engineers Tools Single ended box spanners Whitworth

SW – Code Size mm
Length across ins-mm
Hexagon flats ins T bar mm


SW.12 1-1/4 Whit x 52 6 – 150 2.05 12.7


SW54 54 (New)


Tubular box spanner sets

Melform Engineers Tools Tubular box spanner sets

Set – Code Description


Metric

Set-1M 6 – 19mm + Bars


Set-2M 12 – 27mm + Bars


AF

Set-3AF 3/8” – 1 1/8” AF + Bars


Whitworth

Set-4W 1/8” – 1” Whit + Bars


Metric single ended range

Melform Engineers Tools Metric single ended range

SME – Code Size mm
Length ins-mm
Across hexagon flats ins T bar mm


SME.5 10 2 – 50 .398 6.35


SME.6 11 2 – 50 .437 6.35


SME.8 13 3 – 75 .516 6.35


Tommy Bars

T – Code Size across ins-mm
Length ins-mm Type


T.30 1/8 – 3.2 2-3/8 – 60 Parallel


T.31 3/16 – 4.8 3 – 75 Parallel


T.32 1/4 – 6.35 3 – 75 Parallel


T.33 1/4 – 6.35 4 – 100 Parallel


T.34 1/4 – 6.35 6 – 150 Parallel


T.35 5/16 – 8 4 3/4 – 120 Parallel


T.36 5/16 – 8 6 – 150 Parallel


T.38 3/8 – 9 6 – 150 Parallel


T.39 3/8 – 9 8 – 200 Parallel


T.44 1/2 – 12.7 7-1/2 – 175 Parallel


T.47 5/8 – 15.5 12 – 300 Parallel


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